AD712JR Equivalent & Substitute Parts

Part Overview

The AD712JR is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

The AD712JR is characterized by low input bias current (25 pA), moderate slew rate (20 V/µs), and a -3dB bandwidth of 4 MHz, making it suitable for precision signal conditioning and low-noise amplification applications. The obsolete status requires engineers to evaluate active alternatives that maintain functional compatibility within system requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	20	V/µs
-3dB Bandwidth	4	MHz
Current - Input Bias	25	pA
Voltage - Input Offset	300	µV
Current - Supply	5	mA
Current - Output / Channel	25	mA
Voltage - Supply Span (Min)	9	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AD712JR is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input topology for low input bias current performance
Number of Circuits: Dual-channel (2) configuration
Package / Case: 8-SOIC form factor for PCB compatibility
Mounting Type: Surface mount technology

Secondary Compatibility Parameters:

Slew Rate: Minimum 16 V/µs (AD712JR operates at 20 V/µs)
-3dB Bandwidth: Minimum 4 MHz
Current - Input Bias: Maximum 25 pA (J-FET types) or 20 pA (alternative J-FET types)
Voltage - Supply Span: Minimum 9 V to 36 V overlap required
Operating Temperature: Minimum 0°C to 70°C coverage

Substitute parts are grouped into two categories:

Direct Equivalent (Identical Specifications): AD712JRZ maintains identical electrical specifications and J-FET topology, differing only in packaging format (Tube vs. unspecified for AD712JR).

Functional Alternatives (J-FET Topology, Different Performance Envelope): LF253DT and LF353DT provide J-FET input characteristics with comparable bandwidth and slew rate performance, though with different input offset voltage and supply current specifications.

Enhanced Performance Alternatives (J-FET Topology, Superior Specifications): ADA4610-2BRZ offers J-FET input with rail-to-rail output, higher slew rate (61 V/µs), and extended temperature range, suitable for applications requiring improved performance margins.

General Purpose Alternatives (Different Topology, Functional Compatibility): MC33072DR2G, MC33178DR2G, MC34072DR2G, LM2904VQDR, LMV822M, and LM833DT provide dual-channel amplification in 8-SOIC packages with varying input bias current characteristics and supply voltage ranges. These parts sacrifice J-FET input performance for alternative topologies and are suitable only when input bias current requirements are relaxed.

Parameter Comparison

Parameter	AD712JR (Main)	AD712JRZ	ADA4610-2BRZ	LF253DT	LF353DT	MC33072DR2G	MC33178DR2G	MC34072DR2G	LM2904VQDR	LM833DT	LMV822M
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	Audio	General Purpose
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Slew Rate (V/µs)	20	20	61	16	16	13	2	13	0.3	7	2
-3dB Bandwidth (MHz)	4	4	9.5	4	4	—	—	—	—	—	—
Current - Input Bias (pA/nA)	25 pA	25 pA	5 pA	20 pA	20 pA	100 nA	100 nA	100 nA	20 nA	300 nA	40 nA
Voltage - Input Offset (µV/mV)	300 µV	300 µV	200 µV	3 mV	3 mV	1 mV	150 µV	1 mV	3 mV	300 µV	1 mV
Current - Supply (mA)	5	5	1.6 (x2)	1.4 (x2)	1.4 (x2)	1.9 (x2)	1.7 (x2)	1.9 (x2)	1	4	0.5 (x2)
Current - Output / Channel (mA)	25	25	79	40	40	30	100	30	40	37	45
Voltage - Supply Span Min (V)	9	9	10	6	6	3	4	3	3	5	2.5
Voltage - Supply Span Max (V)	36	36	30	36	36	44	36	44	26	30	5.5
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	-40 to 105	0 to 70	-40 to 85	-40 to 85	0 to 70	-40 to 125	-40 to 105	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Obsolete	Active	Last Time Buy
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1: Direct Equivalent

AD712JRZ is the primary replacement for AD712JR. This part maintains identical electrical specifications, J-FET input topology, and 8-SOIC packaging. The only difference is packaging format (Tube). AD712JRZ carries Active product status and ROHS3 compliance, making it the preferred choice for direct substitution in new designs and production continuity.

Tier 2: J-FET Functional Alternatives

LF253DT and LF353DT are J-FET input amplifiers in 8-SOIC packages with active product status. Both parts maintain the 4 MHz bandwidth and dual-channel configuration. LF253DT supports extended operating temperature (-40°C to 105°C) compared to the AD712JR baseline. LF353DT maintains the 0°C to 70°C temperature range. These parts are suitable when J-FET input characteristics are required and minor variations in slew rate (16 V/µs vs. 20 V/µs) and input offset voltage (3 mV vs. 300 µV) are acceptable.

Tier 3: Enhanced Performance Alternative

ADA4610-2BRZ provides J-FET input with superior performance specifications: 61 V/µs slew rate, 9.5 MHz bandwidth, 5 pA input bias current, and rail-to-rail output capability. Extended operating temperature range (-40°C to 125°C) and active product status support long-term availability. This part is suitable for applications requiring improved dynamic performance and wider temperature operation, with the constraint that maximum supply voltage is 30 V (vs. 36 V for AD712JR).

Tier 4: General Purpose Alternatives

MC33072DR2G, MC33178DR2G, and MC34072DR2G are general purpose amplifiers with active product status and ROHS3 compliance. These parts sacrifice J-FET input performance (100 nA input bias current) for alternative topologies. MC33178DR2G offers the highest output current capability (100 mA per channel) and extended supply voltage range (4 V to 36 V). MC33072DR2G and MC34072DR2G provide single-ended output configuration. These alternatives are suitable only when input bias current requirements are relaxed below 100 nA.

LM2904VQDR is obsolete and not recommended for new designs despite ROHS3 compliance.

LMV822M carries Last Time Buy status and is not recommended for new production.

LM833DT is an audio amplifier with 300 nA input bias current and active product status. This part is suitable for audio-specific applications where J-FET input performance is not critical.

Compliance and Certification:

All recommended active alternatives (AD712JRZ, ADA4610-2BRZ, LF253DT, LF353DT, MC33072DR2G, MC33178DR2G, MC34072DR2G, LM833DT) carry ROHS3 compliance and REACH Unaffected status, supporting regulatory requirements for new product designs.

Frequently Asked Questions (FAQ)

Q: Can AD712JRZ be used as a direct replacement for AD712JR?

A: Yes. AD712JRZ maintains identical electrical specifications, J-FET input topology, dual-channel configuration, and 8-SOIC packaging. The difference is packaging format (Tube). AD712JRZ is active and ROHS3 compliant, making it the recommended direct replacement.

Q: What is the primary difference between AD712JR and ADA4610-2BRZ?

A: Both are J-FET input dual-channel amplifiers in 8-SOIC packages. ADA4610-2BRZ offers enhanced performance: 61 V/µs slew rate (vs. 20 V/µs), 9.5 MHz bandwidth (vs. 4 MHz), 5 pA input bias current (vs. 25 pA), and rail-to-rail output. Maximum supply voltage is 30 V (vs. 36 V). ADA4610-2BRZ is suitable for applications requiring improved dynamic performance.

Q: Can I use MC33178DR2G instead of AD712JR?

A: MC33178DR2G is a general purpose amplifier with 100 nA input bias current, compared to AD712JR's 25 pA J-FET input. This represents a 4000× increase in input bias current. Substitution is possible only if the application does not require low input bias current performance. MC33178DR2G offers higher output current (100 mA vs. 25 mA per channel) and is active with ROHS3 compliance.

Q: Why is LM2904VQDR not recommended as a substitute?

A: LM2904VQDR is classified as obsolete, which creates the same procurement risk as the original AD712JR. Additionally, it is a general purpose amplifier with 20 nA input bias current and significantly lower slew rate (0.3 V/µs), making it unsuitable for applications requiring J-FET input performance or moderate bandwidth.

Q: What is the operating temperature difference between AD712JR and LF253DT?

A: AD712JR operates from 0°C to 70°C. LF253DT operates from -40°C to 105°C, providing extended low-temperature and high-temperature capability. LF353DT maintains the 0°C to 70°C range. Temperature range selection depends on application requirements.

Q: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All substitute parts listed are available in 8-SOIC (0.154", 3.90mm Width) surface mount packages, ensuring PCB layout compatibility with AD712JR designs.

Q: What is the supply voltage compatibility between AD712JR and its substitutes?

A: AD712JR operates from 9 V to 36 V. LF253DT and LF353DT support 6 V to 36 V (wider low-voltage range). ADA4610-2BRZ supports 10 V to 30 V (narrower high-voltage range). MC33072DR2G and MC34072DR2G support 3 V to 44 V (widest range). Verify supply voltage requirements before substitution.

Q: Which substitute offers the lowest input bias current?

A: ADA4610-2BRZ provides 5 pA input bias current, which is lower than AD712JR's 25 pA. LF253DT and LF353DT provide 20 pA. All other alternatives exceed 40 nA. Selection depends on application sensitivity to input bias current.

Q: Is RoHS compliance required for my application?

A: All active substitute parts (AD712JRZ, ADA4610-2BRZ, LF253DT, LF353DT, MC33072DR2G, MC33178DR2G, MC34072DR2G, LM833DT) carry ROHS3 compliance. If RoHS compliance is mandatory, these parts satisfy regulatory requirements. AD712JR does not specify RoHS status.

Q: What is the difference between LF253DT and LF353DT?

A: Both are J-FET input dual-channel amplifiers with identical electrical specifications (16 V/µs slew rate, 4 MHz bandwidth, 20 pA input bias current, 8-SOIC package). The difference is operating temperature range: LF253DT operates -40°C to 105°C, while LF353DT operates 0°C to 70°C. Select based on temperature requirements.

Q: Can I use LMV822M for new production?

A: LMV822M carries Last Time Buy status, indicating limited future availability. It is not recommended for new production designs. Use AD712JRZ, ADA4610-2BRZ, LF253DT, or LF353DT for long-term design support.

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