MODEL: 20VS1AHybrid IC Isolation Amplifiers 20 Series
ISOLATION AMPLIFIER(high speed response, 3-port isolation)
Functions & Features• Being used for printed wiring board installation• High-linearity• High speed response 50 μsec.
• Isolating between input, output and power• Isolation between input, output and power supply up to3000 V AC
• Power 15 V DC
Typical Applications• Galvanically isolating the I/O circuits of microprocessor
from the field side to reduce external noise• Enabling electronic manufacturers to save efforts and costfor the development of isolation circuits for small-lotproducts

GENERAL SPECIFICATIONS
Construction: Hybrid IC
Housing material: Flame-resistant resin (black)
Isolation: Input to output to power

INPUT SPECIFICATIONS■ DC Voltage
Input : -10 – +10 V DC
Input resistance: ≥ 1 MΩ (10 kΩ in power failure)
Overload input voltage: ±15 V DC continuous
Input offset voltage: ±2 mV @ G = 1
Input bias current: 25 pA TYP. (@25°C)

OUTPUT SPECIFICATIONS■ DC Voltage: -10 – +10 V DC
Load resistance: ≥ 2 kΩ
Output impedance: ≤ 1 ΩREFERENCE VOLTAGE SOURCE■ FOR INPUT
Output voltage: ±16.5 V DC ±2.5 V (when power supply is15 V DC)
Load current: ≤ 2 mA
■ FOR OUTPUT
Output voltage: ±16.5 V DC ±2.5 V (when power supply is15 V DC)
Load current: ≤ 2 mA

MODEL: 20VS1A–4W4W[1]–U

INSTALLATIONORDERING INFORMATIONPower input•DC: Rating ±5 %; approx. 50 mA with no load
Operating temperature: -25 to +85°C (-13 to +185°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Soldering to the printed wiring boardWeight: 20 g (0.71 oz)• Code number: 20VS1A-4W4W[1]-USpecify a code from below for [1].
(e.g. 20VS1A-4W4WA-U)

INPUT / OUTPUT
4W4W: -10 - +10 V DC (Input resistance 1 MΩ min.)/ -10 - +10 V DC (Load resistance 2 kΩ min.)[1] LINEARITY
A: ±0.025 %B: ±0.012 %C: ±0.008 %POWER INPUTDC Power
U: 15 V DCPERFORMANCE in percentage of span
Unless otherwise specified, G = 1.
Linearity:±0.025 % (20VS1A-4W4WA)±0.012 % (20VS1A-4W4WB)±0.008 % (20VS1A-4W4WC)
Temp. coefficient:±25 ppm/°C (0℃ - 70℃; 32 - 158°F)±50 ppm/°C (-25℃ - +85℃; -13 - +185°F)
Frequency characteristics: Approx. 20 kHz, -3 dB
Response time: ≤ 50 μsec. (0 – 90 %)Conversion gain: ×1 ±1.5 %Gain adjustable range: × 1 to × 100
Line voltage effect: ±0.01 % over voltage range

20VS1A SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4421 Rev.1 Page 1/5

MODEL: 20VS1A
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 3000 V AC @1 minute (input orreference voltage source for input to output or reference
voltage source for output to power)
CMRR: ≥ 120 dB (500 V AC 50/60 Hz)

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]
4.5(.18)
7.62 (.3)

2.54 (.1)

12.7(.5)

10.16(.4)
22.86 (.9)

2.54(.1)

153.3 (2.1)

PIN
ASSIGNMENTS

22 (.87)

26 (1.02)

2.54 (.1)

11.3(.44)

OUTPUT (+)
OUTPUT COM (–)
REF. VOLT. SOURCE for OUTPUT (+)
REF. VOLT. SOURCE for OUTPUT (–)

89

POWER SUPPLY (+)
POWER SUPPLY (–)

131415161718

REF. VOLT. SOURCE for INPUT(+)
REF. VOLT. SOURCE for INPUT (–)
FEEDBACKINVERTING INPUT
INPUT COM (–)
NON-INVERTING INPUT(BOTTOM VIEW)

1.23(.05)

0.45 dia.
(.02)

1234SCHEMATIC CIRCUITRY & CONNECTION DIAGRAMFEEDBACK 15
INVERTING INPUT 16
INPUT VIN

NON-INVERTING INPUT 18Isolation
AmplifierOutputDriver

1 +OUTPUT

2 – COM (–)

COM (–) 17+

133 +–

144 –REFERENCE Volt. SOURCE for INPUTREFERENCE Volt. SOURCE for OUTPUT

8+9–

POWER SUPPLY

Note. The reference voltage source for input is common to the input COM (–)
The reference voltage source for output is common to the output COM (–)

20VS1A SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4421 Rev.1 Page 2/5

MODEL: 20VS1A
APPLICATION EXAMPLE
10 kΩ ≤ (R1 + R2) ≤ 200 kΩ
n Non-inverting amplifier circuit: Basic example of G = 1■15–+16–

18++1 +OUTPUT Vo

INPUT VIN–2 –17+ 13REF. Volt. SOURCE for INPUT– 148+3+4–

REF. Volt. SOURCE for OUTPUT

POWER

9–

15V DC
Non-inverting circuit G = 1■n Inverting amplifier circuit: Basic example of G = -1 (output inverted to the input)
R1R1+15–
16–18+

INPUT VIN–+OUTPUT Vo

2 –17+ 13

REF. Volt. SOURCE for INPUT

1 +– 148+3+4–

REF. Volt. SOURCE for OUTPUT

POWER

9–

15V DC
Inverting circuit G = -1

n Non-inverting amplifier circuit: Example of G = 1 + R1 / R2■
R2R1

15–
16–+18+–17+1 +OUTPUT VO

INPUT VIN

2 –+ 13REF. Volt. SOURCE for INPUT– 14POWER

8+3+4–REF. Volt. SOURCE for OUTPUT

9–15V DC
Non-inverting amplifier circuit G = 1 + R1 / R220VS1A SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4421 Rev.1 Page 3/5

MODEL: 20VS1A
n Inverting amplifier circuit: Example of G = -R1 / R2 (output inverted to the input)■
R2R115+–16
INPUT VIN–+18

OUTPUT VO

172 –+ 133 +–REF. Volt. SOURCE for INPUT

1 ++REF. Volt. SOURCE for OUTPUT

POWER– 1489+–4 –15V DC
Inverting amplifier circuit G = -R1 / R2n Non-inverting amplifier circuit with external adjustments: Example of G = 2■
10kΩ
(SPAN)
10kΩ

9kΩ

152kΩ

–+INPUT VIN

50kΩ
(ZERO)

200Ω

16–

18+

OUTPUT VO

172 –13 + REF. Volt.

3 +SOURCE– 14 – for INPUT–30kΩ

1 ++REF. Volt. SOURCE for OUTPUT

POWER

89+–4 –

15V DC
Non-inverting amplifier circuit zero/span adjustments

n Inverting amplifier's circuit with external adjustments: Example of G = -1 (output inverted to the input)■10kΩ
(SPAN)
10kΩ

9kΩ

+

152kΩ

–18+

INPUT VIN–100kΩ
(ZERO)

200Ω
30kΩ

–16+1 +OUTPUT VO

172 –13 + REF. Volt.

3+

4–SOURCE
14 – for INPUT

POWER

8+

REF. Volt. SOURCE for OUTPUT

9–15V DC
Inverting amplifier circuit zero/span adjustments

20VS1A SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4421 Rev.1 Page 4/5

MODEL: 20VS1A■ Non-inverting amplifier circuit: With noise filter+Vos

15––16–+18+–17++1–Vos

INPUT VIN2+ 13
REF. Volt. SOURCE for INPUT– 14POWER

83+Vos

4–Vos

REF. Volt. SOURCE
for OUTPUT

9+–15V DC

Specifications are subject to change without notice.

20VS1A SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4421 Rev.1 Page 5/5