AS1976 [AMSCO]
Ultra-Low Current, 1.8V Comparators; 超低电流, 1.8V比较型号: | AS1976 |
厂家: | AMS(艾迈斯) |
描述: | Ultra-Low Current, 1.8V Comparators |
文件: | 总17页 (文件大小:423K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Data Sheet
AS1976, AS1977
Ultra-Low Current, 1.8V Comparators
1 General Description
2 Key Features
ꢀ CMOS Push/Pull Output Sinks and Sources 8mA
The AS1976/AS1977 are very low-current comparators
that can operate beyond the rail voltages and are guar-
anteed to operate down to 1.8V
(AS1976)
ꢀ CMOS Open-Drain Output Voltage Extends Beyond
Low input bias current, current-limiting output circuitry,
and ultra-small packaging make these comparators
ideal for low-power 2-cell applications including power-
management and power-monitoring systems.
VCC (AS1977)
ꢀ Ultra-Low Supply Current: 200nA
ꢀ Internal Hysteresis: 3mV
The comparators are available as the standard products
listed in Table 1.
Table 1. Standard Products
ꢀ 3V-to5V Logiv-Level Translation
ꢀ Guaranteed to Operate Down to +1.8V
Model
AS1976
AS1977
Output Type
Push/Pull
Current
200nA
200nA
Open-Drain
ꢀ Input Voltage Range Operates 200mV Beyond the
Rails
The AS1976 push/pull output can sink or source current.
The AS1977 open-drain output can be pulled beyond
VCC to a maximum of 6V > VEE. This open-drain model
is ideal for use as a logic-level translator or bipolar-to-
unipolar converter.
ꢀ Crowbar Current-Free Switching
ꢀ No Phase Reversal for Overdriven Inputs
ꢀ 5-pin SOT23 Package
Large internal output drivers provide rail-to-rail output
swings with loads up to 8mA. Both devices feature built-
in battery power-management and power-monitoring cir-
cuitry.
3 Applications
The AS1976/AS1977 are available in a 5-pin SOT23
package.
The devices are ideal for battery monitoring/manage-
ment, mobile communication devices, laptops and
PDAs, ultra-low-power systems, threshold detectors/dis-
criminators, telemetry and remote systems, medical
instruments, or any other space-limited application with
low power-consumption requirements.
Figure 1. Block Diagram
5
VCC
AS1976/
AS1977
3
+
1
IN+
4
OUT
–
IN-
2
VEE
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AS1976/AS1977
Data Sheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
OUT
VEE
IN+
1
2
3
5
VCC
AS1976/
AS1977
4
IN-
Pin Descriptions
Table 2. Pin Descriptions
Pin
Pin Name
Number
Description
Comparator Output
1
2
3
4
5
OUT
VEE
IN+
IN-
Negative Supply Voltage
Comparator Non-Inverting Input
Comparator Inverting Input
Positive Supply Voltage
VCC
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AS1976/AS1977
Data Sheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical
Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter
Min
Max
Units
Comments
Supply Voltage VCC to VEE
+7
V
VEE
VCC
Voltage Inputs IN+, IN-
V
V
- 0.3
+ 0.3
VEE
- 0.3
VCC
+ 0.3
Output Voltage AS1976, AS1978
Output Current
-50
+50
10
mA
s
Output Short-Circuit Duration
Continuous Power Dissipation
Operating Temperature Range
Storage Temperature Range
571
+85
+150
mW
ºC
Derate at 7.31mW/ºC above +70ºC
-40
-65
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020C “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
Package Body Temperature
+260
ºC
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
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AS1976/AS1977
Data Sheet - Electrical Characteristics
6 Electrical Characteristics
VCC = +5V, VEE = 0, VCM = 0, TAMB = -40 to +85ºC (unless otherwise specified). Typ values are at TAMB = +25ºC.
Table 4. AS1976/AS1977 Electrical Characteristics
Symbol
Parameter
Conditions
Inferred from the PSRR test
VCC = 1.8V
Min
Typ
Max Units
VCC
Supply Voltage Range
1.8
5.5
V
0.2
ICC
Supply Current
VCC = 5V, TAMB = +25ºC
VCC = 5V, TAMB = TMIN to TMAX
0.21
0.5
0.9
µA
Input Common-Mode
Voltage Range
VEE
- 0.2
VCC
+ 0.2
VCM
Inferred from CMRR test
V
-0.2V ≤ VCM ≤ (VCC + 0.2V),
1
5
TAMB = +25ºC 1
VOS
Input Offset Voltage
mV
-0.2V ≤ VCM ≤ (VCC + 0.2V),
10
TAMB = TMIN to TMAX
Input-Referred
Hysteresis
-0.2V ≤ VCM ≤ (VCC + 0.2V) 2
VHB
IB
3
mV
nA
TAMB = +25ºC
0.15
1
2
Input Bias Current 3
TAMB = TMIN to TMAX
IOS
Input Offset Current
10
pA
Power-Supply
Rejection Ratio
PSRR
VCC = 1.8 to 5.5V, TAMB = +25ºC
0.05
1
mV/V
Common-Mode
Rejection Ratio
(VEE - 0.2V) ≤ VCM ≤ (VCC + 0.2V),
CMRR
0.2
3
mV/V
TAMB = +25ºC
TAMB = +25ºC,
220
500
650
200
300
500
650
200
300
1
AS1976 only VCC = 5.5V, ISINK = 8mA
TAMB = TMIN to TMAX,
AS1976 only VCC = 5.5V, ISINK = 8mA
Output Voltage Swing
High
VCC - VOH
mV
TAMB = +25ºC
AS1976 only VCC = 1.8V, ISOURCE = 1mA
80
220
70
TAMB = TMIN to TMAX,
AS1976 only VCC = 1.8V, ISOURCE = 1mA
TAMB = +25ºC,
AS1976 only VCC = 5.5V, ISINK = 8mA
TAMB = TMIN to TMAX,
AS1976 only VCC = 5.5V, ISINK = 8mA
Output Voltage Swing
Low
VOL
mV
TAMB = +25ºC,
VCC = 1.8V, ISOURCE = 1mA
TAMB = TMIN to TMAX,
VCC = 1.8V, ISOURCE = 1mA
Output Leakage
Current
ILEAK
ISC
AS1977 only, VOUT = 5.5V
0.001
µA
Sourcing, VOUT = VEE, VCC = 5.5V
Sourcing, VOUT = VEE, VCC = 1.8V
Sinking, VOUT = VCC, VCC = 5.5V
Sinking, VOUT = VCC, VCC = 1.8V
VCC = 1.8V
50
6
Output Short-Circuit
Current
mA
70
5
10
12
High-to-Low
tPD-
µs
Propagation Delay 4
VCC = 5.5V
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AS1976/AS1977
Data Sheet - Electrical Characteristics
Table 4. AS1976/AS1977 Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
AS1976 only, VCC = 1.8V
Min
Typ
13
Max Units
AS1976 only, VCC = 5.5V
15
Low-to-High
tPD+
µs
Propagation Delay 4
AS1977 only, VCC = 1.8V, RPULUP = 100kΩ
AS1977 only, VCC = 3.6V, RPULUP = 100kΩ
AS1976 only, CLOAD = 15pF
CLOAD = 15pF
16
18
tRISE
tFALL
tON
Rise Time
Fall Time
10
ns
ns
ns
10
Power-Up Time
100
1. VOS is defined as the center of the hysteresis band at the input.
2. The hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the
center of the band (i.e., VOS) (see Figure 26 on page 11).
3. Guaranteed by design.
4. Specified with an input overdrive voltage (VOVERDRIVE) = 100mV, and load capacitance (CLOAD) = 15pF. VOVER-
DRIVE is defined above and beyond the offset voltage and hysteresis of the comparator input. A reference volt-
age error should also be added.
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AS1976/AS1977
Data Sheet - Typical Operating Characteristics
7 Typical Operating Characteristics
Figure 3. ICC vs. VCC and Temperature
Figure 4. ICC vs. Temperature
500
300
275
250
225
200
175
150
VCC = 3V
400
300
+85ºC
+25ºC
VCC = 5V
VCC = 1.8V
200
-40ºC
100
0
1.5
2.5
3.5
4.5
5.5
-40
-15
10
35
60
85
Supply Voltage (V)
Temperature (°C)
Figure 5. ICC vs. Output Transition Frequency
Figure 6. VOL vs. ISINK
50
600
500
400
40
VCC = 3V
VCC = 5V
30
VCC = 1.8V
VCC = 5V
300
200
100
0
20
VCC = 3V
VCC = 1.8V
10
0
1
10
100
1000 10000 100000
2
4
6
8
10
12
14
16
Output Transition Frequency (Hz)
Sink Current (mA)
Figure 7. VOL vs. ISINK and Temperature
Figure 8. VOH vs. ISOURCE
600
500
0.8
0.6
VCC = 1.8V
+25ºC
VCC = 3V
400
300
200
100
0
+85ºC
0.4
0.2
0
VCC = 5V
-40ºC
2
4
6
8
10
12
14
16
0
5
10
15
20
Sink Current (mA)
Source Current (mA)
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AS1976/AS1977
Data Sheet - Typical Operating Characteristics
Figure 9. VOH vs. ISOURCE and Temperature
Figure 10. Short Circuit Sink Current vs. Temperature
0.8
100
0.6
75
VCC = 5V
+25ºC
+85ºC
0.4
50
-40ºC
VCC = 3V
0.2
0
25
VCC = 1.8V
0
0
5
10
15
20
-40
-15
10
35
60
85
Source Current (mA)
Temperature (°C)
Figure 11. Short Circuit Source Current vs. Temperature Figure 12. tPD+ vs. Temperature
25
20
15
10
5
80
60
40
20
0
VCC = 5V
VCC = 5V
VCC = 1.8V
VCC = 3V
VCC = 3V
VCC = 1.8V
0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
Figure 13. tPD- vs. Temperature
Figure 14. tPD- vs. Capacitive Load
150
125
100
75
20
16
VCC = 5V
VCC = 3V
12
VCC = 1.8V
8
4
0
VCC = 1.8V
50
25
0
VCC = 3V
VCC = 5V
-40
-15
10
35
60
85
0.01
0.1
1
10
100
1000
Temperature (°C)
Capacitive Load (nF)
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AS1976/AS1977
Data Sheet - Typical Operating Characteristics
Figure 15. tPD+ vs. Capacitive Load
Figure 16. tPD+ 5V
200
150
100
VCC = 1.8V
50
VCC = 3V
VCC = 5V
0
0.01
0.1
1
10
100
1000
4µs/Div
Capacitive Load (nF)
Figure 17. tPD- 5V
Figure 18. tPD+ 3V
4µs/Div
4µs/Div
Figure 19. tPD- 3V
Figure 20. tPD+ 1.8V
4µs/Div
4µs/Div
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AS1976/AS1977
Data Sheet - Typical Operating Characteristics
Figure 21. tPD- 1.8V
Figure 22. 10kHz Response @ 1.8V
4µs/Div
20µs/Div
Figure 23. 1kHz Response @ 5V
Figure 24. Powerup/Powerdown Response
200µs/Div
40µs/Div
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AS1976/AS1977
Data Sheet - Detailed Description
8 Detailed Description
The AS1976/AS1977 are ultra low-current comparators and are guaranteed to operate with voltages as low as +1.8V.
The common-mode input voltage range extends 200mV beyond the rail voltages, and internal hysteresis ensures
clean output switching, even with slow input signals.
The AS1976 push/pull output stage sinks and sources-current. The AS1977 open-drain output stage can be pulled
beyond VCC to an absolute maximum of 3.6V > VEE. The AS1979/AS1977 are perfect for implementing wired-OR out-
put logic functions.
For all comparators, large internal output drivers allow rail-to-rail output swings with loads of up to 8mA. The output
stage design minimizes supply-current surges during switching, eliminating most power supply transients.
Input Stage
The input common-mode voltage range extends from (VEE - 0.2V) to (VCC + 0.2V), and the comparators can operate at
any differential input voltage within this range. The comparators have very low input bias current (±0.15nA, typ) if the
input voltage is within the common-mode voltage range.
Inputs are protected from over-voltage conditions by internal ESD protection diodes connected to the supply rails. As
the input voltage exceeds the supply rails, these ESD protection diodes are forward biased and begin to conduct.
Output Stage
The break-before-make output stage is capable of rail-to-rail operation with loads up to 8mA. Many comparators con-
sume orders of magnitude more current during switching than during steady-state operation.
Even at loads of up to 8mA, changes in supply-current during an output transition are extremely small (see Figure 5 on
page 6). As shown in Figure 5, the minimal supply current increases as the output switching frequency approaches
1kHz. This characteristic reduces the need for power-supply filter capacitors to reduce transients created by compara-
tor switching currents.
Because of the unique design of its output stage, the AS1976/AS1977 can dramatically increase battery life, even in
high-speed applications.
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AS1976/AS1977
Data Sheet - Application Information
9 Application Information
The AS1976/AS1977 comparators are perfect for use with all 2-cell battery-powered applications. Figure 25 shows a
typical application for the AS1977.
Figure 25. AS1977 Typical Application Circuit
VIN
5
4
VCC
IN-
RPULLUP
AS1977
1
OUT
3
2
IN+
VEE
Internal Hysteresis
The comparators were designed with 3mV of internal hysteresis to neutralize the effects of parasitic feedback, i.e., to
prevent unwanted rapid changes between the two output states.
The internal hysteresis in the AS1976/AS1977 creates two trip points:
ꢀ
Rising Input Voltage (VTHR) – The comparator switches its output from low to high as VIN rises above this trip point.
Falling Input Voltage (VTHF) – The comparator switches its output from high to low as VIN falls below this trip point.
ꢀ
The area between the trip points is the hysteresis band (VHB) (see Figure 26). When the AS1976/AS1977 input volt-
ages are equivalent, the hysteresis effectively causes one input to move quickly past the other, thus taking the input
out of the region where oscillation occurs. In Figure 26 IN- has a fixed voltage applied and IN+ is varied.
Note: If the inputs are reversed the output will be inverted.
Figure 26. Threshold Hysteresis Band
Thresholds
IN+
VTHR
Hysteresis
Band
IN-
VHB
VTHF
OUT
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AS1976/AS1977
Data Sheet - Application Information
Additional Hysteresis (AS1976)
Additional hysteresis can be added to the AS1976 and AS1978 with three resistors and positive feedback (see Figure
27), however, this positive feedback method slows hysteresis response time.
Figure 27. AS1976 Additional Hysteresis
VCC
R3
R1
VIN
+
–
VCC
VEE
OUT
R2
VREF
Resistor Selection Example
For the circuit shown in Figure 27, use the following steps to calculate values for R1, R2, and R3.
1. First select the value for R3. Leakage current at IN is less than 2nA, thus the current through R3 should be at least
0.2µA to minimize errors due to leakage current. The current through R3 at the trip point is:
(VREF - VOUT)/R3
(EQ 1)
Taking into consideration the two possible output states, solving for R3 yields two formulas:
R3 = VREF/IR3
(EQ 2)
(EQ 3)
R3 = (VCC - VREF)/IR3
Use the smaller of the two resulting values for R3. For example, for VREF = 1.245V, VCC = 3.3V, and IR3 = 1µA, the
two resistor values are 1.2MΩ and 2.0MΩ, therefore choose a 1.2MΩ standard resistor for R3.
2. Choose the required hysteresis band (VHB). For this example, choose 33mV.
3. Calculate R1 as:
R1 = R3(VHB/VCC)
Substituting the R1 and VHB example values gives:
(EQ 4)
(EQ 5)
R1 = 1.2MΩ(50mV/3.3V) = 12kΩ
4. Choose the trip point for VIN rising (VTHR) such that VTHR > VREF(R1 + R3)/R3. For this example, choose 3V.
5. Calculate R2 as:
R2 = 1/[VTHR/(VREF x R1) - (1/R1) - (1/R3)]
Substituting the R1 and R3 example values gives:
R2 = 1/[3.0V/(1.2V x 12kΩ) - (1/12kΩ) - (1/1.2MΩ)] = 8.05kΩ
In this example, a standard 8.2kΩ resistor should be used for R2.
6. Verify the trip voltages and hysteresis as:
VTHR = VREF x R1[(1/R1) + (1/R2) + (1/R3)]
VTHF = VTHR - (R1 x VCC/R3)
(EQ 6)
(EQ 7)
(EQ 8)
Hysteresis = VTHR - VTHF
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AS1976/AS1977
Data Sheet - Application Information
Additional Hysteresis (AS1977)
Additional hysteresis can be added to the AS1977 and AS1979 with 4 resistors and positive feedback (see Figure 28).
Figure 28. AS1977 Additional Hysteresis
VCC
R3
R4
R1
VIN
+
–
VCC
VEE
OUT
R2
VREF
Resistor Selection Example
For the circuit shown in Figure 28, use the following steps to calculate values for R1, R2, R3, and R4.
1. Select R3 according to one of these formulas:
R3 = VREF/1µA
R3 = (VCC - VREF)/1µA - R4
(EQ 9)
(EQ 10)
Use the smaller of the two resulting resistor values for R3.
2. Choose the hysteresis band required (VHB).
3. Calculate R1 as:
R1 = (R3 + R4)(VHB/VCC)
4. Choose the trip point for VIN rising (VTHR).
5. Calculate R2 as:
(EQ 11)
(EQ 12)
R2 = 1/[VTHR/(VREF x R1) - (1/R1) - 1/R3]
6. Verify the trip voltages and hysteresis as:
VIN rising: VTHR = VREF[R1(1/R1 + 1/R2 + 1/R3)]
VIN falling: VTHF = VREF[R1(1/R1 + 1/R2 + 1/(R3+R4))] - [1/(R3+R4)]VCC
Hysteresis = VTHR - VTHF
(EQ 13)
(EQ 14)
(EQ 15)
Zero-Crossing Detector
Figure 29 shows the AS1976 in a zero-crossing detector circuit. The inverting input (IN-) is connected to ground, and
the non-inverting input (IN+) is connected to a 100mVp-p signal source. When the signal at IN- crosses 0V, the signal
at OUT changes states.
Figure 29. Zero Crossing Detector
100mVp-p
3
+
1
IN+
4
OUT
–
IN-
AS1976
5
2
VCC
VEE
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AS1976/AS1977
Data Sheet - Application Information
Logic-Level Translation
The AS1977 can be used as a 5V-to-3V logic translator. Figure 30 shows an application that converts 5V- to 3V-logic
levels, and provides the full 5V logic-swing without creating overvoltage on the 3V logic inputs.
Note: When the comparator is powered by a 5V supply, RPULUP for the open-drain output should be connected to the
+3V supply voltage.
For 3V-to-5V logic-level translations, connect the +3V supply voltage to VCC and the +5V supply voltage to RPULUP.
Figure 30. AS1977 Logic-Level Translation Circuit
+3/+5V
5
VCC
+3/+5V
RPullup
100kΩ
100kΩ
4
1
+5/+3V
Logic Out
REF
OUT
AS1977
+5/+3V
Logic In
3
2
IN+
VEE
Logic-Level Translator
Layout Considerations
The AS1976/AS1977 requires proper layout and design techniques for optimum performance.
ꢀ
Power-supply bypass capacitors are not typically required, although 100nF bypass capacitors should be placed
close to the AS1976/AS1977 supply pins when supply impedance is high, leads are long, or for excessive noise on
the supply lines.
ꢀ
ꢀ
ꢀ
Minimize signal trace lengths to reduce stray capacitance.
A ground plane should be used.
Surface-mount components should be used whenever practical.
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AS1976/AS1977
Data Sheet - Package Drawings and Markings
10 Package Drawings and Markings
The AS1976/AS1977 are available in a 5-pin SOT23 package.
Figure 31. 5-pin SOT23 Package
Symbol
Min
0.90
0.00
0.90
0.30
0.09
2.80
2.60
1.50
0.30
Max
1.45
0.15
1.30
0.50
0.20
3.05
3.00
1.75
0.55
A
A1
A2
b
C
D
E
E1
L
e
0.95 REF
1.90 REF
e1
α
0º
8º
Notes:
1. Controlling dimension is millimeters.
2. Foot length measured at intercept point between datum A and lead surface.
3. Package outline exclusive of mold flash and metal burr.
4. Package outline inclusive of solder plating.
5. Meets JEDEC MO178.
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AS1976/AS1977
Data Sheet - Ordering Information
11 Ordering Information
The devices are available as the standard products shown in Table 5.
Table 5. Ordering Information
Type
Marking
ASI9
Description
Output Type Delivery Form
Package
AS1976
AS1976-T
AS1977
AS1977-T
Ultra-Low Current 1.8V Comparator
Ultra-Low Current 1.8V Comparator
Ultra-Low Current 1.8V Comparator
Ultra-Low Current 1.8V Comparator
Push/Pull
Push/Pull
Tube
5-pin SOT23
ASI9
Tape and Reel 5-pin SOT23
Tube 5-pin SOT23
ASJA
ASJA
Open-Drain
Open-Drain Tape and Reel 5-pin SOT23
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AS1976/AS1977
Data Sheet
Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans-
lated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami-
crosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-
sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
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Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
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VSWR. Return Loss and Transmission Loss vs. Trans|DC-6 GHz Plastic Packaged and Chip|SPST
ETC
AS1B-E3/5AT
DIODE 1 A, 100 V, SILICON, SIGNAL DIODE, DO-214AC, ROHS COMPLIANT, SMA, 2 PIN, Signal Diode
VISHAY
AS1B-E3/61T
DIODE 1 A, 100 V, SILICON, SIGNAL DIODE, DO-214AC, ROHS COMPLIANT, SMA, 2 PIN, Signal Diode
VISHAY
AS1D-E3/5AT
DIODE 1 A, 200 V, SILICON, SIGNAL DIODE, DO-214AC, ROHS COMPLIANT, SMA, 2 PIN, Signal Diode
VISHAY
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