NJM2749AD Equivalent & Substitute Parts

Part Overview

The NJM2749AD is a J-FET operational amplifier manufactured by Nisshinbo Micro Devices Inc., configured as a dual-circuit (2-channel) device in an 8-DIP through-hole package. This linear amplifier is classified as Active product status with full RoHS compliance and REACH unaffected designation. The NJM2749AD is specified for applications requiring low input bias current and moderate slew rate performance across industrial temperature ranges (-40°C to 85°C). Substitute parts are necessary when addressing supply chain constraints, inventory availability, or when design specifications permit operation within the electrical parameter tolerances of alternative J-FET or general-purpose amplifier architectures.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	13	V/µs
Gain Bandwidth Product	2.2	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	800	µV
Current - Supply	3.8	mA
Voltage - Supply Span (Min)	12	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-40 to 85	°C
Package / Case	8-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the NJM2749AD is determined by the following criteria applied strictly to the provided parameters:

Primary Substitution Criteria (J-FET Amplifiers):

Amplifier Type: J-FET
Number of Circuits: 2
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature Range: Must encompass or match -40°C to 85°C
Voltage Supply Span: Must accommodate 12V minimum and 32V maximum

Secondary Substitution Criteria (General-Purpose Amplifiers):

Number of Circuits: 2
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature Range: -40°C to 85°C capability
Voltage Supply Span: Minimum 12V, Maximum 32V

The substitute parts listed below meet one or both of these groupings based on their provided electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	RoHS Status
NJM2749AD	Nisshinbo Micro Devices	J-FET	13	2.2	50	800	3.8	12	32	-40 to 85	RoHS Compliant
LF412CP	Texas Instruments	J-FET	13	3	50	500	4.5	7	36	0 to 70	ROHS3 Compliant
LT1457CN8#PBF	Analog Devices Inc.	J-FET	4	1.7	7	200	1.8	9	36	-40 to 85	ROHS3 Compliant
RC4580IP	Texas Instruments	Audio	5	12	100	500	6	4	32	-40 to 85	ROHS3 Compliant
TL082BCP	Texas Instruments	J-FET	13	3	30	2000	1.4	10	30	0 to 70	ROHS3 Compliant
TL5580AIP	Texas Instruments	General Purpose	5	12	100	300	6	4	32	-40 to 85	ROHS3 Compliant
TL5580IP	Texas Instruments	General Purpose	5	12	100	300	6	4	32	-40 to 85	ROHS3 Compliant

Engineering Selection Recommendations

J-FET Amplifier Substitutes (Preferred Category):

LT1457CN8#PBF (Analog Devices Inc.) is the optimal substitute when full temperature range compatibility (-40°C to 85°C) is required. This part maintains J-FET architecture, dual-circuit configuration, and 8-DIP package specification. The LT1457CN8#PBF demonstrates superior input bias current performance (7 pA versus 50 pA) and lower input offset voltage (200 µV versus 800 µV). Supply voltage range (9V to 36V) accommodates the NJM2749AD specification window. Product status is Active with ROHS3 compliance and MSL 1 rating (Unlimited moisture sensitivity level).

LF412CP (Texas Instruments) provides J-FET substitution with matching slew rate (13 V/µs) and improved gain bandwidth product (3 MHz versus 2.2 MHz). Input bias current and offset voltage specifications align with NJM2749AD parameters. Supply voltage range extends to 36V maximum. Operating temperature range (0°C to 70°C) does not encompass the full -40°C to 85°C specification of the main part; this part is suitable only for applications within the 0°C to 70°C window. Product status is Active with ROHS3 compliance.

TL082BCP (Texas Instruments) maintains J-FET architecture with identical slew rate (13 V/µs) and improved gain bandwidth product (3 MHz). Input bias current is superior (30 pA). Operating temperature range (0°C to 70°C) restricts use to applications not requiring -40°C operation. Supply voltage span (10V to 30V) is narrower than NJM2749AD specification. Product status is Active with ROHS3 compliance.

General-Purpose Amplifier Substitutes (Secondary Category):

TL5580IP and TL5580AIP (Texas Instruments) are general-purpose amplifiers with dual-circuit, 8-DIP configuration. Both parts support full temperature range (-40°C to 85°C) and supply voltage span (4V to 32V). Gain bandwidth product is significantly higher (12 MHz versus 2.2 MHz). Input bias current is substantially higher (100 nA versus 50 pA). These parts are suitable for applications where higher bandwidth and lower supply voltage operation are acceptable trade-offs. Product status for both is Last Time Buy, indicating discontinued or end-of-life status.

RC4580IP (Texas Instruments) is an audio amplifier with dual-circuit, 8-DIP configuration supporting full temperature range (-40°C to 85°C) and supply voltage span (4V to 32V). This part is appropriate only for audio-specific applications where the audio amplifier classification is functionally compatible. Product status is Active with ROHS3 compliance.

Compliance Summary: All substitute parts carry ROHS3 compliance and REACH unaffected designation, matching the regulatory status of the NJM2749AD. Parts with Active product status (LT1457CN8#PBF, LF412CP, TL082BCP, RC4580IP) are preferred for new designs. Parts with Last Time Buy status (TL5580IP, TL5580AIP) are suitable for existing production support only.

Frequently Asked Questions (FAQ)

Q: Can LT1457CN8#PBF directly replace NJM2749AD in all applications?

A: LT1457CN8#PBF is electrically compatible within the 8-DIP through-hole package and maintains J-FET amplifier architecture. The part supports the full operating temperature range (-40°C to 85°C) and supply voltage span (9V to 36V encompasses 12V to 32V). Superior input bias current (7 pA) and lower input offset voltage (200 µV) are beneficial for precision applications. Functional compatibility depends on circuit design tolerance to these parameter differences.

Q: Why does LF412CP show operating temperature 0°C to 70°C instead of -40°C to 85°C?

A: LF412CP is specified by Texas Instruments with a narrower operating temperature range (0°C to 70°C). This is a manufacturer specification difference, not a package limitation. Applications requiring operation below 0°C or above 70°C must use alternative substitutes such as LT1457CN8#PBF or TL5580IP/TL5580AIP.

Q: What is the difference between J-FET and General-Purpose amplifier substitutes?

A: J-FET amplifiers (LF412CP, LT1457CN8#PBF, TL082BCP) are optimized for high input impedance and low input bias current applications. General-Purpose amplifiers (TL5580IP, TL5580AIP) offer higher bandwidth and lower supply voltage operation but with higher input bias current (100 nA). Selection depends on circuit requirements for input impedance and bias current performance.

Q: Are TL5580IP and TL5580AIP suitable for new designs?

A: Both parts carry Last Time Buy product status, indicating manufacturer discontinuation. These parts are appropriate for sustaining existing production or legacy system support only. New designs should utilize parts with Active product status: LT1457CN8#PBF, LF412CP, TL082BCP, or RC4580IP.

Q: Can RC4580IP replace NJM2749AD in precision analog circuits?

A: RC4580IP is classified as an audio amplifier rather than a precision J-FET amplifier. While it maintains dual-circuit 8-DIP configuration and supports the required temperature and supply voltage ranges, its audio amplifier classification indicates optimization for audio-frequency applications. Use in precision DC or low-frequency analog circuits requires circuit-level validation.

Q: What packaging considerations apply to all substitute parts?

A: All substitute parts listed maintain 8-DIP (0.300", 7.62mm) through-hole package specification, ensuring mechanical and electrical compatibility with existing PCB layouts designed for NJM2749AD. No package adapter or redesign is required for physical substitution.

Q: How do supply voltage ranges affect substitution decisions?

A: NJM2749AD requires 12V to 32V supply span. LT1457CN8#PBF (9V to 36V) and TL5580IP/TL5580AIP (4V to 32V) accommodate this range. LF412CP (7V to 36V) and TL082BCP (10V to 30V) have narrower ranges; verify circuit supply voltages fall within specified limits before substitution.

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