KA2902D Equivalent & Substitute Parts

Part Overview

The KA2902D is a general-purpose operational amplifier integrated circuit featuring four independent amplifier circuits in a 14-SOIC surface mount package. Manufactured by onsemi, this device is classified as obsolete and no longer recommended for new designs. The KA2902D operates across a wide supply voltage range of 3V to 26V and maintains performance across industrial temperature ranges from -40°C to 85°C.

Due to its obsolete status, identifying functionally equivalent and compatible substitute components is essential for ongoing production support, maintenance applications, and design continuity. Substitute parts must maintain electrical compatibility across critical parameters including supply voltage specifications, output current capability, input bias current, and package form factor.

Key Parameters

Parameter	KA2902D Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Current - Input Bias	40	nA
Voltage - Input Offset	1.5	mV
Current - Supply	1	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	26	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution compatibility for the KA2902D is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Circuit Configuration: All substitutes maintain four independent amplifier circuits, preserving functional equivalence at the system level.

Supply Voltage Range: The KA2902D operates from 3V to 26V. Substitute parts with extended maximum supply voltage ratings (up to 32V) remain compatible, as they support the full operating range of the original device. Minimum supply voltage must not exceed 3V.

Output Current Capability: The KA2902D provides 40mA per channel output current. Substitute parts must maintain this specification or exceed it to ensure adequate drive capability.

Input Bias Current and Offset Voltage: These parameters define signal fidelity. Substitutes with comparable or lower input bias current (40nA or less) and input offset voltage (1.5mV to 3mV) maintain signal integrity characteristics.

Operating Temperature Range: The KA2902D operates from -40°C to 85°C. Substitutes with extended temperature ranges (to 105°C or 125°C) provide enhanced reliability in demanding environments while remaining backward compatible.

Parameter Comparison

Part Number	Manufacturer	Product Status	Input Bias (nA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Output Current (mA)	Temp Range (°C)	Package
KA2902D	onsemi	Obsolete	40	1.5	3	26	40	-40 to 85	14-SOIC
LM224DR2G	onsemi	Active	90	2	3	32	40	-25 to 85	14-SOIC
LM2902DR2G	onsemi	Active	90	2	3	32	40	-40 to 105	14-SOIC
LM2902VDR2G	onsemi	Active	90	2	3	32	40	-40 to 125	14-SOIC
LM324ADR2G	onsemi	Active	40	2	3	32	40	0 to 70	14-SOIC
LM324DR2G	onsemi	Active	90	2	3	32	40	0 to 70	14-SOIC
NCV2902DR2G	onsemi	Active	90	2	3	32	40	-40 to 125	14-SOIC
LM2902D	onsemi	Obsolete	20	3	3	26	30	-40 to 125	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	20	1	3	32	30	-40 to 125	14-SOIC
LM2902DT	Rohm Semiconductor	Not For New Designs	20	1	3	32	30	-40 to 125	14-SOIC
LM2902KAVQDR	Texas Instruments	Active	20	3	3	30	30	-40 to 125	14-SOIC

Engineering Selection Recommendations

Primary Substitutes for Active Production:

The LM2902DR2G, LM2902VDR2G, and NCV2902DR2G represent the most suitable active alternatives to the obsolete KA2902D. All three parts are manufactured by onsemi, maintain the identical 14-SOIC package form factor, and support the full 3V to 26V supply range of the original device. These parts feature extended maximum supply voltage ratings (32V) and enhanced temperature operating ranges, providing improved reliability margins. The LM2902VDR2G and NCV2902DR2G extend operation to 125°C, offering superior performance in high-temperature applications. All three parts carry RoHS3 compliance certification and maintain unlimited moisture sensitivity level (MSL 1) ratings.

Alternative Substitutes:

The LM324ADR2G and LM324DR2G provide functional equivalence with identical 40mA output current capability and 3V to 32V supply range. However, these parts operate within a narrower temperature range (0°C to 70°C), making them suitable only for commercial-grade applications that do not require the full -40°C to 85°C industrial temperature span of the original KA2902D.

The LM224DR2G operates within a limited temperature range (-25°C to 85°C), which does not fully cover the lower temperature extreme of the KA2902D (-40°C). This part is suitable for applications where the minimum operating temperature requirement does not extend below -25°C.

Automotive-Grade Alternative:

The LM2902KAVQDR from Texas Instruments is an AEC-Q100 qualified automotive-grade device with active product status. This part maintains the -40°C to 125°C operating range and provides enhanced reliability for automotive and harsh-environment applications. The 30mA output current per channel is lower than the KA2902D specification; applications requiring the full 40mA output capability should select alternatives with higher current ratings.

Compliance Considerations:

All recommended active substitutes carry RoHS3 compliance certification and REACH unaffected status, ensuring regulatory compliance for new designs and ongoing production. The obsolete LM2902D and LM2902DR variants do not carry RoHS3 compliance and should be used only for legacy system support where regulatory exemptions apply.

Frequently Asked Questions (FAQ)

Q: Can the LM2902DR2G directly replace the KA2902D in existing designs?

A: Yes. The LM2902DR2G maintains identical package geometry (14-SOIC), circuit configuration (four amplifiers), and supply voltage range (3V to 26V). The part is pin-compatible and functionally equivalent. The extended maximum supply voltage (32V) and operating temperature range (-40°C to 105°C) provide enhanced performance margins over the original specification.

Q: What is the difference between LM2902DR2G, LM2902VDR2G, and NCV2902DR2G?

A: All three parts are functionally equivalent with identical electrical specifications. The primary differences are packaging format and maximum operating temperature. LM2902DR2G is supplied in Cut Tape and Digi-Reel format with operation to 105°C. LM2902VDR2G is supplied in Tape & Reel format with operation to 125°C. NCV2902DR2G is supplied in Cut Tape and Digi-Reel format with operation to 125°C. Selection depends on packaging requirements and temperature performance needs.

Q: Why do some substitutes show higher input bias current (90nA vs. 40nA)?

A: Input bias current variation reflects different semiconductor process technologies and design approaches. The LM224DR2G and LM2902DR2G exhibit 90nA input bias current compared to the KA2902D specification of 40nA. This difference remains within acceptable limits for general-purpose amplifier applications and does not prevent functional substitution. Applications with stringent input bias current requirements should select the LM324ADR2G (40nA) or LM2902KAVQDR (20nA).

Q: Is the LM324 series compatible with the KA2902D?

A: The LM324ADR2G and LM324DR2G are functionally compatible in terms of package, circuit count, and output current capability. However, both parts operate within a narrower temperature range (0°C to 70°C) compared to the KA2902D (-40°C to 85°C). These parts are suitable only for commercial-grade applications that do not require full industrial temperature coverage.

Q: What is the significance of the "K" designation in LM2902KAVQDR?

A: The "K" designation indicates automotive-grade qualification to AEC-Q100 standards. The LM2902KAVQDR is specifically qualified for automotive and harsh-environment applications requiring enhanced reliability and temperature performance (-40°C to 125°C). This part is recommended for automotive designs and applications subject to automotive qualification requirements.

Q: Can I use the LM2902D (obsolete onsemi part) as a substitute?

A: The LM2902D is obsolete and not recommended for new designs. While it maintains the 14-SOIC package and four-circuit configuration, it exhibits lower output current capability (30mA vs. 40mA) and does not carry RoHS3 compliance certification. This part should be used only for legacy system support where regulatory exemptions apply and inventory is available.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and Tube. All formats maintain identical electrical specifications and 14-SOIC package geometry. Selection depends on assembly process requirements and volume needs. Cut Tape and Digi-Reel formats are suitable for lower-volume applications and manual assembly. Tape & Reel format is optimized for high-volume automated assembly processes.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts (LM224DR2G, LM2902DR2G, LM2902VDR2G, LM324ADR2G, LM324DR2G, NCV2902DR2G, and LM2902KAVQDR) carry RoHS3 compliance certification. Obsolete parts (LM2902D, LM2902DR, LM2902DT) do not carry RoHS3 compliance and are restricted to legacy applications only.

Q: What is the maximum supply voltage for substitute parts?

A: The KA2902D operates to 26V maximum supply voltage. All recommended active substitutes support 32V maximum supply voltage, providing a 6V safety margin. The LM2902KAVQDR supports 30V maximum supply voltage. All parts maintain the 3V minimum supply voltage specification, ensuring full backward compatibility.

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