KA2904DMTF Equivalent & Substitute Parts

Part Overview

The KA2904DMTF is a general-purpose operational amplifier featuring two independent circuits in an 8-SOIC surface mount package, manufactured by onsemi. This device is classified as obsolete, indicating it has reached end-of-life status and is no longer recommended for new designs. The part delivers 30 mA output per channel with a supply voltage range of 3 V to 26 V and operates across the industrial temperature range of -40°C to 85°C.

Due to its obsolete status, identifying functionally equivalent and compatible substitute parts is essential for design continuity, production support, and long-term component availability. Substitute parts must maintain electrical compatibility across critical parameters including supply voltage range, output current capability, input bias current, and package form factor.

Key Parameters

Parameter	KA2904DMTF Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Current - Input Bias	45	nA
Voltage - Input Offset	2.9	mV
Current - Supply	800	µA
Current - Output / Channel	30	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	8-SOIC (0.154", 3.90mm Width)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution compatibility for the KA2904DMTF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures mechanical and electrical pin compatibility
Number of Circuits: 2 — maintains functional equivalence
Amplifier Type: General Purpose — preserves application suitability
Mounting Type: Surface Mount — supports existing PCB assembly processes
Voltage - Supply Span: Minimum 3 V and Maximum ≥ 26 V — ensures operation across the original supply range
Current - Output / Channel: ≥ 30 mA — maintains or exceeds load-driving capability
Current - Input Bias: 45 nA — establishes input impedance characteristics
Operating Temperature: Must encompass or extend the -40°C to 85°C range

Substitution Logic: Substitute parts are grouped into three categories based on their relationship to the KA2904DMTF:

Direct Substitutes (Same Base Product): Parts sharing the LM2904 base product number with identical or superior electrical specifications and active product status.
Functional Equivalents (Alternative Base Products): Parts with different base product numbers (LM258, LM358, NCV2904, AD8022) that meet all mandatory compatibility criteria while offering enhanced performance characteristics.
Legacy Alternatives (Discontinued or Last-Time-Buy): Parts with restricted product status (Not For New Designs, Last Time Buy) that maintain electrical compatibility but are not recommended for new applications.

Parameter Comparison

Parameter	KA2904DMTF	LM258DR2G	LM2904DR2G	LM2904VDR2G	LM358DR2G	NCV2904DR2G	LM2904DR (Rohm)	LM2904DRG3	LM2904QDRG4	AD8022ARZ
Manufacturer	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	Rohm Semiconductor	Texas Instruments	Texas Instruments	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Not For New Designs	Last Time Buy	Last Time Buy	Active
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	Voltage Feedback
Number of Circuits	2	2	2	2	2	2	2	2	2	2
Current - Input Bias (nA)	45	45	45	45	45	45	20	20	20	2500
Voltage - Input Offset (mV)	2.9	2	2	7	2	7	3	3	3	1.5
Current - Supply (µA)	800	800	800	1500	800	1500	1000	500	500	4000
Current - Output / Channel (mA)	30	40	40	40	40	40	40	40	40	55
Voltage - Supply Span (Min) (V)	3	3	3	3	3	3	3	3	3	4.5
Voltage - Supply Span (Max) (V)	26	32	26	32	32	32	26	26	26	26
Operating Temperature (°C)	-40 to 85	-25 to 85	-40 to 85	-40 to 125	0 to 70	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-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
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1: Recommended Active Substitutes

The following parts are recommended for new designs and ongoing production support due to active product status and full compliance with mandatory compatibility criteria:

LM2904DR2G (onsemi): This part maintains identical base product lineage with the KA2904DMTF while offering active product status. It delivers equivalent electrical performance across all critical parameters including 45 nA input bias current, 2 mV input offset voltage, 800 µA supply current, and 40 mA output per channel. The operating temperature range of -40°C to 85°C matches the original specification. Supply voltage range extends to 32 V maximum, providing enhanced headroom. ROHS3 compliance and unlimited MSL rating ensure regulatory alignment.

LM2904VDR2G (onsemi): This variant extends the operating temperature range to -40°C to 125°C, providing superior thermal performance for industrial applications. Input bias current remains at 45 nA. Supply voltage range extends to 32 V. Input offset voltage increases to 7 mV and supply current increases to 1.5 mA per channel, representing acceptable trade-offs for extended temperature operation. ROHS3 compliance confirmed.

NCV2904DR2G (onsemi): This part offers the same extended temperature range (-40°C to 125°C) as LM2904VDR2G with additional slew rate specification of 0.6 V/µs. Input bias current, output current capability, and supply voltage range match LM2904VDR2G. Tape & Reel packaging supports high-volume production. ROHS3 compliant.

LM258DR2G (onsemi): This alternative base product (LM258 series) meets all mandatory compatibility criteria with 45 nA input bias current, 2 mV input offset voltage, and 40 mA output per channel. Supply voltage range extends to 32 V maximum. Operating temperature range of -25°C to 85°C covers the original specification minimum. ROHS3 compliant with active product status.

LM358DR2G (onsemi): This part maintains compatibility with 45 nA input bias current, 2 mV input offset voltage, and 40 mA output per channel. Supply voltage range extends to 32 V. Operating temperature range of 0°C to 70°C is narrower than the original specification, limiting applicability to commercial temperature environments. ROHS3 compliant with active product status.

AD8022ARZ (Analog Devices Inc.): This voltage feedback amplifier represents a performance upgrade with 100 MHz gain-bandwidth product and 50 V/µs slew rate, compared to the general-purpose characteristics of the KA2904DMTF. It delivers 55 mA output per channel and maintains 8-SOIC package compatibility. Minimum supply voltage is 4.5 V, which exceeds the original 3 V minimum. Operating temperature range of -40°C to 85°C matches the original specification. ROHS3 compliant with active product status. This part is suitable for applications requiring higher bandwidth and slew rate performance.

Tier 2: Legacy Alternatives (Restricted Status)

The following parts maintain electrical compatibility but carry product status restrictions limiting their use to existing designs and production support:

LM2904DR (Rohm Semiconductor): Marked as "Not For New Designs," this part is suitable for sustaining production of existing designs. It delivers 40 mA output per channel with 20 nA input bias current (lower than original), 3 mV input offset voltage, and 1 mA supply current. Operating temperature range extends to -40°C to 125°C. Supply voltage range of 3 V to 26 V matches the original specification. ROHS3 compliant.

LM2904DRG3 (Texas Instruments): Marked as "Last Time Buy," this part is available in limited quantities (3,820 pcs) for final production runs. It delivers 40 mA output per channel with 20 nA input bias current, 3 mV input offset voltage, and 500 µA supply current per channel. Operating temperature range of -40°C to 125°C provides extended thermal coverage. Supply voltage range of 3 V to 26 V matches the original specification. ROHS3 compliant.

LM2904QDRG4 (Texas Instruments): Marked as "Last Time Buy," this part is available in minimal quantities (1,015 pcs) in Tape & Reel packaging. Electrical specifications match LM2904DRG3 with 40 mA output per channel, 20 nA input bias current, 3 mV input offset voltage, and 500 µA supply current per channel. Operating temperature range of -40°C to 125°C and supply voltage range of 3 V to 26 V match the original specification. ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can LM2904DR2G be used as a direct replacement for KA2904DMTF in existing designs?

A: Yes. LM2904DR2G maintains identical package form factor (8-SOIC), circuit count (2 independent amplifiers), and critical electrical parameters including input bias current (45 nA), input offset voltage (2 mV), supply current (800 µA), and output current per channel (40 mA). The supply voltage range of 3 V to 26 V encompasses the original specification. Operating temperature range of -40°C to 85°C matches the original device. Pin-for-pin compatibility is confirmed.

Q: What is the difference between LM2904DR2G and LM2904VDR2G?

A: Both parts share the LM2904 base product number and 8-SOIC package. LM2904VDR2G extends the operating temperature range to -40°C to 125°C, compared to -40°C to 85°C for LM2904DR2G. LM2904VDR2G increases supply current to 1.5 mA per channel (versus 800 µA) and input offset voltage to 7 mV (versus 2 mV). Supply voltage range extends to 32 V maximum for LM2904VDR2G. Selection depends on thermal requirements and acceptable offset voltage tolerance.

Q: Why is LM358DR2G not recommended as a primary substitute?

A: LM358DR2G operates across a narrower temperature range of 0°C to 70°C, which does not encompass the original KA2904DMTF specification of -40°C to 85°C. This restriction limits applicability to commercial temperature environments only. For applications requiring the full industrial temperature range, LM2904DR2G or LM2904VDR2G are preferred alternatives.

Q: Is AD8022ARZ compatible with KA2904DMTF applications?

A: AD8022ARZ maintains 8-SOIC package compatibility and 2-circuit configuration. However, it is classified as a voltage feedback amplifier rather than a general-purpose amplifier, with significantly higher bandwidth (100 MHz versus unspecified for KA2904DMTF) and slew rate (50 V/µs). Input bias current is substantially higher at 2.5 µA compared to 45 nA. Minimum supply voltage is 4.5 V, exceeding the original 3 V minimum. AD8022ARZ is suitable for applications requiring higher-speed performance but may introduce different circuit behavior in designs optimized for general-purpose amplifier characteristics.

Q: What is the significance of product status classifications?

A: Product status indicates manufacturer support and availability. "Active" status confirms ongoing production, full technical support, and long-term availability. "Not For New Designs" indicates the manufacturer no longer recommends the part for new applications but continues supporting existing designs. "Last Time Buy" indicates the manufacturer has announced final production with limited remaining inventory. "Obsolete" indicates the part is no longer manufactured or supported. For new designs, parts with "Active" status are strongly preferred.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance certification, confirming conformance to Restriction of Hazardous Substances Directive requirements. The original KA2904DMTF does not specify RoHS status in the provided data. All substitute parts meet current environmental and regulatory standards for electronic component manufacturing.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel® for standard production quantities, Tape & Reel (TR) for high-volume automated assembly, and Tube packaging for smaller quantities. All maintain the 8-SOIC (0.154", 3.90mm Width) form factor for PCB compatibility. Packaging selection depends on production volume and assembly process requirements.

Q: Can LM2904DR (Rohm Semiconductor) be used for new designs?

A: No. LM2904DR carries "Not For New Designs" product status, indicating the manufacturer does not recommend it for new applications. This part is reserved for sustaining production of existing designs. For new designs, select from parts with "Active" product status such as LM2904DR2G, LM2904VDR2G, or NCV2904DR2G.

Q: What is the difference between LM2904DRG3 and LM2904QDRG4?

A: Both parts are Texas Instruments LM2904 variants with "Last Time Buy" status and identical electrical specifications. LM2904DRG3 is available in Cut Tape & Digi-Reel packaging with 3,820 pcs inventory. LM2904QDRG4 is available in Tape & Reel packaging with 1,015 pcs inventory. Both offer extended operating temperature range of -40°C to 125°C and reduced supply current of 500 µA per channel. Selection depends on packaging requirements and available inventory.

Q: How does input bias current affect circuit design?

A: Input bias current (45 nA for KA2904DMTF and most LM2904 variants) represents the DC current flowing into the amplifier input terminals. Higher input bias current increases input impedance loading on signal sources and can introduce offset errors in high-impedance circuits. The 20 nA input bias current of Rohm and Texas Instruments LM2904 variants provides improved performance in high-impedance applications. AD8022ARZ with 2.5 µA input bias current is unsuitable for high-impedance signal conditioning without additional buffering.

Q: What is the significance of supply voltage range differences?

A: The original KA2904DMTF operates from 3 V to 26 V. Substitute parts with extended maximum supply voltage (32 V for LM258DR2G, LM2904VDR2G, LM358DR2G, NCV2904DR2G) provide additional design flexibility for higher-voltage applications. AD8022ARZ with 4.5 V minimum supply voltage cannot operate in 3 V single-supply applications. For designs requiring 3 V operation, select parts with confirmed 3 V minimum specification.

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