OP249GS Equivalent & Substitute Parts

Part Overview

The OP249GS is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-circuit (2-channel) device in an 8-SOIC surface mount package. This component is classified as obsolete, indicating that direct procurement of the OP249GS may face supply constraints. The OP249GS operates across a wide supply voltage range of 9V to 36V and is designed for applications requiring low input bias current and low input offset voltage characteristics typical of J-FET amplifier architectures. Identification of equivalent and substitute parts is necessary to ensure design continuity and maintain access to functionally compatible alternatives for new production runs or design revisions.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	22	V/µs
Gain Bandwidth Product	4.7	MHz
Current - Input Bias	30	pA
Voltage - Input Offset	400	µV
Current - Supply	5.6	mA
Current - Output / Channel	36	mA
Voltage - Supply Span (Min)	9	V
Voltage - Supply Span (Max)	36	V
Operating Temperature Range	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the OP249GS is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET architecture
Number of Circuits: 2 (dual-channel configuration)
Package / Case: 8-SOIC form factor
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Slew Rate: 22 V/µs (baseline reference)
Gain Bandwidth Product: 4.7 MHz (baseline reference)
Current - Input Bias: 30 pA (baseline reference)
Voltage - Input Offset: 400 µV (baseline reference)
Voltage - Supply Span: 9V to 36V operating range
Operating Temperature: -40°C to 85°C

Substitute parts are classified into two categories:

Direct Equivalent: OP249GSZ maintains identical electrical specifications and differs only in packaging format (Tube vs. unspecified for OP249GS) and product status (Active vs. Obsolete).

Functional Alternatives: Parts including ADA4610-2BRZ, LT1057 series, LT1113 series, and LT1169 series share the J-FET amplifier architecture, dual-circuit configuration, and 8-SOIC package. These alternatives may exhibit variations in slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, output current, supply voltage range, and operating temperature range. Selection depends on application-specific requirements within these parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Number of Circuits	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Input Bias Current (pA)	Input Offset Voltage (µV)	Supply Current (mA)	Output Current / Channel (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temperature (°C)	Package
OP249GS	Analog Devices Inc.	Obsolete	J-FET	2	22	4.7	30	400	5.6	36	9	36	-40 to 85	8-SOIC
OP249GSZ	Analog Devices Inc.	Active	J-FET	2	22	4.7	30	400	5.6	36	9	36	-40 to 85	8-SOIC
ADA4610-2BRZ	Analog Devices Inc.	Active	J-FET	2	61	16.3	5	200	1.6	79	10	30	-40 to 125	8-SOIC
LT1057IS8#PBF	Analog Devices Inc.	Active	J-FET	2	13	5	7	220	1.7	—	20	36	-40 to 85	8-SOIC
LT1057IS8#TRPBF	Analog Devices Inc.	Active	J-FET	2	13	5	7	220	1.7	—	20	36	-40 to 85	8-SOIC
LT1057S8#PBF	Analog Devices Inc.	Active	J-FET	2	13	5	7	220	1.7	—	20	36	0 to 70	8-SOIC
LT1057S8#TRPBF	Analog Devices Inc.	Active	J-FET	2	13	5	7	220	1.7	—	20	36	0 to 70	8-SOIC
LT1113CS8#PBF	Analog Devices Inc.	Active	J-FET	2	3.9	5.6	300	550	5.3	—	9	40	-40 to 85	8-SOIC
LT1113CS8#TRPBF	Analog Devices Inc.	Active	J-FET	2	3.9	5.6	300	550	5.3	—	9	40	-40 to 85	8-SOIC
LT1169CS8#PBF	Analog Devices Inc.	Active	J-FET	2	4.2	5.3	4	600	5.3	—	9	40	0 to 70	8-SOIC
LT1169CS8#TRPBF	Analog Devices Inc.	Active	J-FET	2	4.2	5.3	4	600	5.3	—	9	40	0 to 70	8-SOIC

Engineering Selection Recommendations

Direct Replacement: OP249GSZ is the recommended direct replacement for OP249GS. This part maintains identical electrical specifications and mechanical compatibility while offering Active product status, ensuring continued availability and manufacturing support. OP249GSZ is RoHS3 Compliant and REACH Unaffected, meeting current regulatory requirements.

Active Alternatives for Extended Temperature Range: ADA4610-2BRZ is suitable for applications requiring extended operating temperature range (-40°C to 125°C) and enhanced performance characteristics including higher slew rate (61 V/µs), higher gain bandwidth product (16.3 MHz), lower input bias current (5 pA), and rail-to-rail output capability. This part operates within a reduced supply voltage range (10V to 30V maximum) compared to OP249GS. ADA4610-2BRZ is RoHS3 Compliant and REACH Unaffected.

Active Alternatives for Standard Temperature Range: LT1057 series (IS8#PBF, IS8#TRPBF, S8#PBF, S8#TRPBF) provides Active status with J-FET architecture and dual-circuit configuration. These parts exhibit lower slew rate (13 V/µs) and lower input bias current (7 pA) compared to OP249GS. Supply voltage range is 20V to 36V. Operating temperature variants include -40°C to 85°C (IS8 versions) and 0°C to 70°C (S8 versions). All LT1057 variants are RoHS3 Compliant and REACH Unaffected.

Active Alternatives with Extended Supply Voltage Range: LT1113 series (CS8#PBF, CS8#TRPBF) and LT1169 series (CS8#PBF, CS8#TRPBF) offer supply voltage range of 9V to 40V, exceeding the OP249GS maximum of 36V. LT1113 series operates at -40°C to 85°C with higher input bias current (300 pA) and input offset voltage (550 µV). LT1169 series operates at 0°C to 70°C with significantly lower input bias current (4 pA) and higher input offset voltage (600 µV). Both series are RoHS3 Compliant and REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can OP249GSZ be used as a direct replacement for OP249GS? A: Yes. OP249GSZ maintains identical electrical specifications, package configuration, and mechanical compatibility with OP249GS. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube). OP249GSZ is the recommended direct substitute.

Q: What are the key differences between OP249GS and ADA4610-2BRZ? A: ADA4610-2BRZ offers enhanced performance with higher slew rate (61 V/µs vs. 22 V/µs), higher gain bandwidth product (16.3 MHz vs. 4.7 MHz), lower input bias current (5 pA vs. 30 pA), and rail-to-rail output capability. However, ADA4610-2BRZ operates at a reduced maximum supply voltage (30V vs. 36V) and requires a minimum supply voltage of 10V (vs. 9V for OP249GS). Operating temperature range extends to 125°C.

Q: Are LT1057 series parts suitable replacements for OP249GS? A: LT1057 series parts share J-FET architecture, dual-circuit configuration, and 8-SOIC packaging. However, they exhibit lower slew rate (13 V/µs vs. 22 V/µs), lower input bias current (7 pA vs. 30 pA), and a higher minimum supply voltage requirement (20V vs. 9V). Selection depends on whether the application can accommodate these parameter differences.

Q: What is the difference between tube and tape & reel packaging options? A: Tube packaging (indicated by #PBF suffix) and Tape & Reel packaging (indicated by #TRPBF suffix) represent different physical delivery formats for surface mount components. Tube packaging is suitable for manual assembly and lower-volume applications. Tape & Reel packaging is optimized for automated pick-and-place assembly in high-volume production. Electrical specifications remain identical between packaging formats.

Q: Can I use LT1113 or LT1169 series if my application requires operation below 9V supply voltage? A: No. Both LT1113 and LT1169 series maintain a minimum supply voltage of 9V, identical to OP249GS. However, both series extend the maximum supply voltage to 40V, providing additional headroom compared to OP249GS (36V maximum).

Q: What compliance certifications apply to substitute parts? A: All substitute parts listed are RoHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components in regulated markets. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: How do I select between multiple LT1057 variants? A: LT1057 variants differ in operating temperature range and packaging format. IS8 versions operate at -40°C to 85°C, while S8 versions operate at 0°C to 70°C. #PBF suffix indicates Tube packaging; #TRPBF suffix indicates Tape & Reel packaging. Select based on your application's temperature requirements and assembly process.

Q: What is the significance of input bias current differences between substitute parts? A: Input bias current affects circuit performance in high-impedance applications. OP249GS specifies 30 pA input bias current. LT1057 series offers lower input bias current (7 pA), while LT1169 series offers significantly lower input bias current (4 pA). Lower input bias current reduces errors in transimpedance amplifier configurations and high-impedance signal conditioning circuits.

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