OPAx131 General-Purpose, FET-Input Operational Amplifiers

1 Features

FET input: I_B = 50pA max
Low offset voltage: 750μV max
Wide supply range: ±4.5V to ±18V
Slew rate: 10V/μs
Wide bandwidth: 4MHz
Excellent capacitive load drive
Single, dual, quad versions

2 Applications

3 Description

The OPAx131 series of FET-input op amps provides high performance at low cost. The OPA131 single, OPA2131 dual, and OPA4131 quad versions in industry-standard pinouts allow cost-effective design options.

The OPAx131 series offers excellent general-purpose performance, including low offset voltage, drift, and good dynamic characteristics.

Single and dual versions are available in an 8-pin, SOIC, surface-mount package. The quad version is available in 14-pin and 16-pin, SOIC, surface-mount packages, and a 14-pin PDIP package.

Device Information

PART NUMBER	CHANNEL COUNT	PACKAGE⁽¹⁾
OPA131	Single	D (SOIC, 8)
OPA2131	Dual	D (SOIC, 8)
OPA4131	Quad	D (SOIC, 14)
		DW (SOIC, 16)
		N (PDIP, 14)

(1) For more information, see Section 9.

Simplified Transimpedance Amplifier

4 Pin Configuration and Functions

OPA131 OPA2131 OPA4131 OPA131 D Package, 8-Pin SOIC
(Top View)

Figure 4-1 OPA131 D Package, 8-Pin SOIC (Top View)

Table 4-1 Pin Functions: OPA131

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
+IN	3	Input	Noninverting input, channel A
–IN	2	Input	Inverting input, channel A
NC	1, 5	—	Do not connect these pins⁽¹⁾
NC	8	—	No internal connection. Float this pin.
OUT	6	Output	Output
V+	7	Power	Positive (highest) power supply
V–	4	Power	Negative (lowest) power supply

(1) Existing layouts for the OPA131 D package before revision B of this data sheet do not need to be redesigned.

OPA131 OPA2131 OPA4131 OPA2131 D Package, 8-Pin SOIC
(Top View)

Figure 4-2 OPA2131 D Package, 8-Pin SOIC (Top View)

Table 4-2 Pin Functions: OPA2131

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
+IN A	3	Input	Noninverting input, channel A
+IN B	5	Input	Noninverting input, channel B
–IN A	2	Input	Inverting input, channel A
–IN B	6	Input	Inverting input, channel B
OUT A	1	Output	Output, channel A
OUT B	7	Output	Output, channel B
V+	8	Power	Positive (highest) power supply
V–	4	Power	Negative (lowest) power supply

OPA131 OPA2131 OPA4131 OPA4131 D Package, 14-Pin
SOIC, and N Package, 14-Pin PDIP (Top View)

Figure 4-3 OPA4131 D Package, 14-Pin SOIC, and N Package, 14-Pin PDIP (Top View)

Table 4-3 Pin Functions: OPA4131 D and N packages

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
+IN A	3	Input	Noninverting input, channel A
+IN B	5	Input	Noninverting input, channel B
+IN C	10	Input	Noninverting input, channel C
+IN D	12	Input	Noninverting input, channel D
–IN A	2	Input	Inverting input, channel A
–IN B	6	Input	Inverting input, channel B
–IN C	9	Input	Inverting input, channel C
–IN D	13	Input	Inverting input, channel D
OUT A	1	Output	Output, channel A
OUT B	7	Output	Output, channel B
OUT C	8	Output	Output, channel C
OUT D	14	Output	Output, channel D
V+	4	Power	Positive (highest) power supply
V–	11	Power	Negative (lowest) power supply

Figure 4-4 OPA4131 DW Package, 16-Pin SOIC (Top View)

Table 4-4 Pin Functions: OPA4131 DW Package

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
+IN A	3	Input	Noninverting input, channel A
+IN B	5	Input	Noninverting input, channel B
+IN C	12	Input	Noninverting input, channel C
+IN D	14	Input	Noninverting input, channel D
–IN A	2	Input	Inverting input, channel A
–IN B	6	Input	Inverting input, channel B
–IN C	11	Input	Inverting input, channel C
–IN D	15	Input	Inverting input, channel D
OUT A	1	Output	Output, channel A
OUT B	7	Output	Output, channel B
OUT C	10	Output	Output, channel C
OUT D	16	Output	Output, channel D
V+	4	Power	Positive (highest) power supply
V–	13	Power	Negative (lowest) power supply
NC	8, 9	—	No internal connection. Float this pin.