KA2902DTF Equivalent & Substitute Parts

Part Overview

The KA2902DTF is a general-purpose operational amplifier integrated circuit manufactured by onsemi, featuring four independent amplifier circuits in a 14-SOP surface mount package. This device is classified as obsolete, with 37,788 units currently in stock. The KA2902DTF operates across a supply voltage range of 3V to 26V and is suitable for applications requiring low input bias current (40 nA) and moderate output current capability (40 mA per channel). Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	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
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the KA2902DTF is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

Four independent amplifier circuits in single package
14-SOIC surface mount package with 0.154" (3.90mm) width
Supply voltage range minimum of 3V and maximum of at least 26V
Input bias current of 40 nA or lower
Output current per channel of 40 mA or higher
Input offset voltage of 1.5 mV or lower
Operating temperature range encompassing -40°C to 85°C

Substitute Categories:

Direct Equivalents (onsemi LM2902 Series): Parts LM2902DR2G, LM2902VDR2G, and NCV2902DR2G maintain identical electrical specifications and package configuration. These parts are active products with higher inventory availability.

Compatible Alternatives (onsemi LM224 and LM324 Series): Parts LM224DR2G and LM324DR2G meet core electrical requirements but operate within narrower temperature ranges (0°C to 70°C or -25°C to 85°C). These are suitable for applications not requiring the full -40°C to 125°C extended range.

Cross-Manufacturer Substitutes (Texas Instruments LM2902 Series): Parts LM2902M/NOPB, LM2902DRG3, LM2902MX/NOPB, and LM2902QDRG4Q1 provide functional equivalence with varying packaging and qualification levels. LM2902QDRG4Q1 includes automotive-grade qualification (AEC-Q100).

Extended Temperature Variants: LM2902VDR2G and NCV2902DR2G support -40°C to 125°C operating range, exceeding the KA2902DTF specification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Input Bias (nA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Output / Ch (mA)	Temp Range (°C)	Package
KA2902DTF	onsemi	Obsolete	40	1.5	3	26	40	-40 to 85	14-SOIC
LM2902DR2G	onsemi	Active	90	2	3	32	40	-40 to 105	14-SOIC
LM224DR2G	onsemi	Active	90	2	3	32	40	-25 to 85	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
LM2902M/NOPB	Texas Instruments	Active	45	2	3	32	40	-40 to 85	14-SOIC
LM2902DRG3	Texas Instruments	Last Time Buy	20	3	3	26	30	-40 to 125	14-SOIC
LM2902MX/NOPB	Texas Instruments	Active	45	2	3	32	40	-40 to 85	14-SOIC
LM2902QDRG4Q1	Texas Instruments	Last Time Buy	20	3	3	26	60	-40 to 125	14-SOIC

Engineering Selection Recommendations

For Active Production Designs:

Select LM2902DR2G (onsemi) or LM2902M/NOPB (Texas Instruments) as primary substitutes. Both are active products with robust inventory availability. LM2902DR2G offers extended maximum supply voltage (32V vs. 26V) and operating temperature range (-40°C to 105°C), providing design margin beyond the KA2902DTF specification. LM2902M/NOPB maintains identical electrical performance with LinCMOS™ series designation and is available in tube packaging.

For Extended Temperature Applications:

LM2902VDR2G (onsemi) and NCV2902DR2G (onsemi) support -40°C to 125°C operating range. Both are active products suitable for industrial and automotive environments requiring full temperature span operation.

For Automotive-Grade Requirements:

LM2902QDRG4Q1 (Texas Instruments) carries AEC-Q100 automotive qualification and Last Time Buy status. This part is suitable for automotive applications requiring formal qualification documentation. Output current per channel is 60 mA, exceeding the KA2902DTF specification.

For Constrained Temperature Ranges:

LM324DR2G and LM324ADR2G (onsemi) operate within 0°C to 70°C range. These are suitable for consumer and commercial applications not requiring extended low-temperature operation. LM324ADR2G matches the KA2902DTF input bias current specification (40 nA).

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level remains 1 (Unlimited) across all alternatives, eliminating special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2902DR2G directly replace KA2902DTF in existing designs?

A: Yes. LM2902DR2G is a direct functional equivalent with identical four-circuit configuration, 14-SOIC package, and core electrical specifications. The higher maximum supply voltage (32V vs. 26V) and extended operating temperature range (-40°C to 105°C) provide additional design margin. No circuit modifications are required.

Q: What is the difference between LM2902 and LM324 series?

A: Both are four-circuit general-purpose operational amplifiers in 14-SOIC packages. The primary difference is operating temperature range. LM2902 variants support -40°C to 85°C or extended ranges, while LM324 variants are limited to 0°C to 70°C. Electrical specifications are comparable. Select LM324 only for applications not requiring below 0°C operation.

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

A: Input bias current variation reflects manufacturing process differences between product generations. The KA2902DTF specifies 40 nA, while newer LM2902 variants specify 90 nA. Both values are within acceptable limits for general-purpose amplifier applications. Applications with extremely high source impedance may require verification of bias current performance.

Q: Is LM2902QDRG4Q1 suitable for non-automotive applications?

A: Yes. LM2902QDRG4Q1 is a qualified automotive-grade part (AEC-Q100) but functions identically in non-automotive circuits. The automotive qualification provides additional process control and reliability documentation. This part carries Last Time Buy status, indicating limited future availability.

Q: What packaging options are available for substitutes?

A: All recommended substitutes are available in 14-SOIC surface mount package matching the KA2902DTF. Packaging variants include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Tube. Select packaging based on assembly process requirements and order quantity.

Q: Can I use LM2902DRG3 as a substitute despite Last Time Buy status?

A: LM2902DRG3 is functionally compatible but carries Last Time Buy designation, indicating discontinued production. Current inventory is 3,900 units. This part is suitable only for applications with limited production volume or where existing stock is available. For ongoing production, select active-status alternatives such as LM2902DR2G or LM2902M/NOPB.

Q: Are there supply voltage limitations when substituting?

A: The KA2902DTF operates from 3V to 26V. Most substitutes extend the maximum to 32V, which is beneficial. However, LM2902DRG3 and LM2902QDRG4Q1 maintain the 26V maximum. Verify your circuit design does not exceed 26V if selecting these parts. All substitutes maintain the 3V minimum supply voltage.

Q: What is the significance of LinCMOS™ designation on LM2902M/NOPB?

A: LinCMOS™ is a Texas Instruments process technology designation indicating CMOS input stage with linear output characteristics. This provides low input bias current and low input offset voltage. The designation is informational and does not affect substitution compatibility.

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