AD746JN Equivalent & Substitute Parts

Part Overview

The AD746JN is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) device in an 8-DIP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production requirements. The AD746JN operates across a supply voltage range of 9V to 36V with a slew rate of 75V/µs and gain bandwidth product of 13 MHz, making it suitable for precision analog signal processing applications requiring low input bias current characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	75	V/µs
Gain Bandwidth Product	13	MHz
Current - Input Bias	110	pA
Voltage - Input Offset	300	µV
Current - Supply	7	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-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the AD746JN is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Amplifier Type (J-FET input architecture)
Number of Circuits (dual-channel configuration)
Package / Case (8-DIP form factor)
Mounting Type (Through Hole)
Voltage - Supply Span compatibility (minimum 9V to maximum 36V overlap)
Operating Temperature range compatibility (minimum 0°C to maximum 70°C overlap)

Direct Equivalent: The AD746JNZ represents a direct equivalent to the AD746JN, maintaining identical electrical specifications while differing only in packaging format (Tube vs. unspecified) and product status (Active vs. Obsolete). This part is the primary replacement for obsolete AD746JN applications.

Functional Alternatives: Parts including TLE2072ACP, TLE2072AIP, TLE2072CP, and TLE2072AIP are J-FET input amplifiers with dual-channel configuration in 8-DIP packages. These alternatives operate within compatible supply voltage ranges and share the same package footprint, though they exhibit different slew rates (45V/µs vs. 75V/µs) and gain bandwidth products (10 MHz vs. 13 MHz).

Extended Alternatives: Parts such as LT1355CN8#PBF, MC33078P, RC4580IP, TL5580IP, and TL5580AIP are dual-channel amplifiers in 8-DIP packages with compatible supply voltage ranges and through-hole mounting. These parts differ in amplifier type (Voltage Feedback, General Purpose, or Audio) and exhibit varying electrical performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Input Bias Current (pA/nA)	Input Offset Voltage (µV)	Supply Current (mA)	Output Current / Channel (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temp (°C)	Package	Product Status
AD746JN	Analog Devices Inc.	J-FET	2	75	13	110 pA	300	7	25	9	36	0 to 70	8-DIP	Obsolete
AD746JNZ	Analog Devices Inc.	J-FET	2	75	13	110 pA	300	7	25	9	36	0 to 70	8-DIP	Active
TLE2072ACP	Texas Instruments	J-FET	2	45	10	1 pA	300	3.1	48	4.5	38	0 to 70	8-DIP	Active
TLE2072AIP	Texas Instruments	J-FET	2	45	10	1 pA	300	3.1	48	4.5	38	-40 to 85	8-DIP	Active
TLE2072CP	Texas Instruments	J-FET	2	45	10	1 pA	300	3.1	48	4.5	38	0 to 70	8-DIP	Active
LT1355CN8#PBF	Analog Devices Inc.	Voltage Feedback	2	400	12	80 nA	300	1	30	5	30	0 to 70	8-DIP	Active
MC33078P	Texas Instruments	General Purpose	2	7	16	300 nA	150	2.05	37	10	36	-40 to 85	8-DIP	Active
RC4580IP	Texas Instruments	Audio	2	5	12	100 nA	500	6	50	4	32	-40 to 85	8-DIP	Active
TL5580IP	Texas Instruments	General Purpose	2	5	12	100 nA	300	6	50	4	32	-40 to 85	8-DIP	Last Time Buy
TL5580AIP	Texas Instruments	General Purpose	2	5	12	100 nA	300	6	50	4	32	-40 to 85	8-DIP	Last Time Buy
LM833P	Texas Instruments	Audio	2	7	16	300 nA	150	2.05	37	10	36	-40 to 85	8-DIP	Last Time Buy

Engineering Selection Recommendations

Primary Recommendation: AD746JNZ

The AD746JNZ is the direct equivalent replacement for the obsolete AD746JN. This part maintains identical electrical specifications across all critical parameters including slew rate, gain bandwidth product, input bias current, and supply voltage range. The AD746JNZ is currently in Active product status with RoHS3 compliance and REACH Unaffected designation, ensuring long-term availability and regulatory compliance for new designs and production continuity.

Secondary Recommendation: TLE2072 Series (TLE2072ACP, TLE2072AIP, TLE2072CP)

The TLE2072 series from Texas Instruments provides J-FET input amplifiers with dual-channel configuration in 8-DIP packages. These parts are Active products with RoHS3 compliance. The TLE2072 series operates within compatible supply voltage ranges (4.5V to 38V) and shares identical input offset voltage (300 µV) with the AD746JN. The primary trade-off is reduced slew rate (45V/µs vs. 75V/µs) and lower gain bandwidth product (10 MHz vs. 13 MHz), with superior input bias current performance (1 pA vs. 110 pA). Temperature range selection between TLE2072ACP/TLE2072CP (0°C to 70°C) and TLE2072AIP (-40°C to 85°C) accommodates different application requirements.

Tertiary Recommendations: Extended Alternatives

Parts including LT1355CN8#PBF, MC33078P, RC4580IP, TL5580IP, and TL5580AIP are dual-channel amplifiers in 8-DIP packages with compatible through-hole mounting. These alternatives operate within overlapping supply voltage ranges and are suitable for applications where amplifier type variation is acceptable. LT1355CN8#PBF offers voltage feedback architecture with higher slew rate (400V/µs). MC33078P and LM833P provide general purpose and audio amplifier configurations with extended temperature ranges (-40°C to 85°C). RC4580IP, TL5580IP, and TL5580AIP are audio and general purpose amplifiers with lower supply voltage minimums (4V to 5V) and extended temperature ranges.

Compliance Considerations

All recommended substitute parts carry RoHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with modern manufacturing and environmental standards. Parts designated as Last Time Buy (TL5580IP, TL5580AIP, LM833P) should be evaluated for long-term availability in production planning.

Frequently Asked Questions (FAQ)

Q: Can the AD746JNZ be used as a direct replacement for the AD746JN?

A: Yes. The AD746JNZ is electrically and mechanically identical to the AD746JN, differing only in packaging format and product status. The AD746JNZ is currently in Active production status, making it the recommended direct replacement for obsolete AD746JN applications.

Q: What are the key differences between the AD746JN and TLE2072 series?

A: Both are J-FET input dual-channel amplifiers in 8-DIP packages with identical input offset voltage (300 µV). The AD746JN provides higher slew rate (75V/µs vs. 45V/µs) and higher gain bandwidth product (13 MHz vs. 10 MHz). The TLE2072 series offers superior input bias current performance (1 pA vs. 110 pA) and operates across a wider supply voltage range (4.5V to 38V vs. 9V to 36V). Temperature range options differ: TLE2072ACP and TLE2072CP operate 0°C to 70°C, while TLE2072AIP extends to -40°C to 85°C.

Q: Are all substitute parts compatible with the 8-DIP through-hole footprint?

A: Yes. All parts listed in the Parameter Comparison table are configured in 8-DIP (0.300", 7.62mm) packages with through-hole mounting, ensuring mechanical compatibility with existing PCB designs.

Q: What supply voltage range must be considered when selecting a substitute?

A: The AD746JN operates from 9V to 36V. When selecting substitutes, verify that the application supply voltage falls within the substitute part's specified range. For example, TLE2072 series operates from 4.5V to 38V, providing broader compatibility. Parts such as RC4580IP and TL5580 series operate from 4V minimum, while MC33078P and LM833P require minimum 10V supply.

Q: Which substitute parts are recommended for new designs?

A: Parts with Active product status are recommended for new designs: AD746JNZ, TLE2072ACP, TLE2072AIP, TLE2072CP, LT1355CN8#PBF, MC33078P, and RC4580IP. Parts designated as Last Time Buy (TL5580IP, TL5580AIP, LM833P) should be avoided in new designs due to limited future availability.

Q: How do amplifier type differences affect substitution?

A: The AD746JN is a J-FET input amplifier, characterized by extremely low input bias current (110 pA). Direct J-FET alternatives include the TLE2072 series. Extended alternatives such as LT1355CN8#PBF (Voltage Feedback), MC33078P (General Purpose), and RC4580IP (Audio) employ different input architectures and may exhibit different performance characteristics in precision analog applications. Substitution with non-J-FET types requires circuit-level evaluation.

Q: What is the significance of RoHS3 compliance and REACH Unaffected status?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. REACH Unaffected status indicates the part is not subject to Registration, Evaluation, Authorization and Restriction of Chemicals regulations. These certifications ensure regulatory compliance for manufacturing and distribution in regulated markets.

Q: Can parts with different operating temperature ranges be substituted?

A: Operating temperature range substitution depends on application requirements. The AD746JN operates 0°C to 70°C. TLE2072ACP and TLE2072CP maintain this range, while TLE2072AIP extends to -40°C to 85°C. Extended temperature range parts (MC33078P, RC4580IP, TL5580 series, LM833P) operate -40°C to 85°C and are suitable for applications requiring broader temperature performance. Verify application temperature requirements before substitution.

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