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KA2904D Equivalent & Substitute Parts
Part Overview
The KA2904D is a general-purpose operational amplifier featuring two circuits in an 8-SOIC surface mount package, manufactured by onsemi. This device is classified as obsolete, indicating discontinued production and limited availability. The KA2904D operates across a supply voltage range of 3 V to 26 V with an operating temperature range of -40°C to 85°C, making it suitable for general-purpose amplification applications in industrial and consumer electronics.
Due to its obsolete status, sourcing original KA2904D units presents supply chain challenges. Active equivalent and substitute parts are available from multiple manufacturers including onsemi, Texas Instruments, and Rohm Semiconductor, offering improved availability while maintaining functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | KA2904D 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) | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution compatibility for the KA2904D is determined by the following critical parameters:
Electrical Compatibility Criteria:
- Amplifier Type: General Purpose (required match)
- Number of Circuits: 2 (required match)
- Current - Input Bias: 45 nA (substitute must not exceed this value significantly)
- Voltage - Supply Span: Minimum 3 V, Maximum ≥ 26 V (substitute must support full range or higher)
- Current - Output / Channel: Minimum 30 mA (substitute must meet or exceed)
- Operating Temperature: Minimum -40°C, Maximum ≥ 85°C (substitute must cover or exceed this range)
Mechanical Compatibility Criteria:
- Mounting Type: Surface Mount (required match)
- Package / Case: 8-SOIC with 0.154" (3.90mm) width (required match or compatible footprint)
Substitute parts are grouped into three categories:
Category 1: Direct onsemi Equivalents (LM2904 Series) These parts share the same base product number (LM2904) and are manufactured by onsemi. They maintain identical package specifications and core electrical characteristics while offering active product status and improved availability.
Category 2: Cross-Manufacturer Equivalents (Texas Instruments LM2904 Series) Texas Instruments manufactures LM2904-based devices with enhanced specifications, including automotive-grade variants (LM2904AVQDRG4Q1) with AEC-Q100 qualification. These provide superior temperature performance and supply voltage ranges.
Category 3: Alternative General-Purpose Amplifiers (LM358 Series, BA2904 Series) These parts maintain the same functional classification and package type but may have different base product numbers. They are suitable where the specific LM2904 designation is not required and electrical parameters fall within acceptable ranges.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Input Bias (nA) | Input Offset (mV) | Supply Current (µA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|
| KA2904D | onsemi | Obsolete | 45 | 2.9 | 800 | 30 | 3 | 26 | -40 to 85 | 8-SOIC |
| LM2904DR2G | onsemi | Active | 45 | 2 | 800 | 40 | 3 | 26 | -40 to 85 | 8-SOIC |
| LM2904VDR2G | onsemi | Active | 45 | 7 | 1500 | 40 | 3 | 32 | -40 to 125 | 8-SOIC |
| LM258DR2G | onsemi | Active | 45 | 2 | 800 | 40 | 3 | 32 | -25 to 85 | 8-SOIC |
| LM358DR2G | onsemi | Active | 45 | 2 | 800 | 40 | 3 | 32 | 0 to 70 | 8-SOIC |
| NCV2904DR2G | onsemi | Active | 45 | 7 | 1500 | 40 | 3 | 32 | -40 to 125 | 8-SOIC |
| LM2904QDRG4 | Texas Instruments | Last Time Buy | 20 | 3 | 500 | 40 | 3 | 26 | -40 to 125 | 8-SOIC |
| LM2904AVQDR | Texas Instruments | Active | 20 | 1 | 500 | 40 | 3 | 30 | -40 to 125 | 8-SOIC |
| LM2904AVQDRG4 | Texas Instruments | Discontinued at DiGi Electronics | 20 | 1 | 500 | 40 | 3 | 30 | -40 to 125 | 8-SOIC |
| LM2904AVQDRG4Q1 | Texas Instruments | Active | 20 | 1 | 500 | 30 | 3 | 26 | -40 to 125 | 8-SOIC |
| BA2904F-E2 | Rohm Semiconductor | Active | 20 | 2 | 500 | 30 | 3 | 32 | -40 to 125 | 8-SOP |
Engineering Selection Recommendations
Primary Recommendation: LM2904DR2G (onsemi)
The LM2904DR2G is the closest functional equivalent to the KA2904D. Both are manufactured by onsemi and share identical electrical specifications for input bias current (45 nA), supply voltage range (3 V to 26 V), and package type (8-SOIC). The LM2904DR2G offers improved output current capability (40 mA versus 30 mA) and lower input offset voltage (2 mV versus 2.9 mV). Product status is Active with high inventory availability (505,300 pcs), ensuring reliable supply chain continuity. RoHS3 compliance and REACH Unaffected status meet modern regulatory requirements.
Secondary Recommendation: LM2904VDR2G (onsemi)
The LM2904VDR2G extends the operating temperature range to -40°C to 125°C and increases maximum supply voltage to 32 V. This variant is suitable for applications requiring enhanced thermal performance. Input bias current remains at 45 nA, maintaining compatibility with the KA2904D specification. Inventory availability is adequate (48,685 pcs). Note that supply current increases to 1.5 mA per channel and input offset voltage rises to 7 mV.
Automotive-Grade Option: LM2904AVQDRG4Q1 (Texas Instruments)
For applications requiring automotive qualification, the LM2904AVQDRG4Q1 provides AEC-Q100 certification and extended temperature range (-40°C to 125°C). This part features superior input bias current (20 nA) and input offset voltage (1 mV). Supply voltage range matches the KA2904D (3 V to 26 V), and output current equals the original specification (30 mA). Product status is Active with 5,400 pcs in inventory.
Alternative for Extended Temperature: NCV2904DR2G (onsemi)
The NCV2904DR2G provides -40°C to 125°C operation with 32 V maximum supply voltage. Input bias current matches the KA2904D (45 nA). This variant is suitable for industrial applications requiring wider temperature margins. Inventory is substantial (655,300 pcs).
Compatibility Constraints:
- LM358DR2G is not recommended for the full KA2904D operating temperature range, as its maximum operating temperature is limited to 70°C.
- BA2904F-E2 uses an 8-SOP package (0.173", 4.40mm width) rather than 8-SOIC (0.154", 3.90mm width), requiring PCB layout verification before substitution.
- LM258DR2G has a reduced minimum operating temperature of -25°C, unsuitable for applications requiring -40°C operation.
Frequently Asked Questions (FAQ)
Q1: Can I directly replace KA2904D with LM2904DR2G without circuit modifications?
A: Yes. The LM2904DR2G is a direct pin-compatible replacement with identical package dimensions (8-SOIC, 0.154" width) and electrical interface. Both devices feature 2 circuits, 45 nA input bias current, and 3 V to 26 V supply voltage range. The LM2904DR2G offers improved specifications (lower input offset voltage, higher output current), making it functionally superior. No circuit modifications are required.
Q2: What is the difference between LM2904DR2G and LM2904VDR2G?
A: Both are onsemi LM2904 variants in 8-SOIC packages. The primary differences are: (1) LM2904VDR2G extends maximum supply voltage to 32 V versus 26 V for LM2904DR2G; (2) LM2904VDR2G operates to 125°C versus 85°C for LM2904DR2G; (3) LM2904VDR2G has higher supply current (1.5 mA per channel versus 800 µA) and higher input offset voltage (7 mV versus 2 mV). Select LM2904VDR2G for applications requiring extended temperature or higher supply voltage; select LM2904DR2G for standard industrial applications with lower power consumption requirements.
Q3: Is the BA2904F-E2 from Rohm Semiconductor compatible with KA2904D?
A: The BA2904F-E2 is functionally equivalent but uses a different package variant. The KA2904D uses 8-SOIC (0.154", 3.90mm width), while BA2904F-E2 uses 8-SOP (0.173", 4.40mm width). Although both are surface mount packages with identical pin counts and similar footprints, the width difference may affect PCB layout compatibility. Verify PCB pad spacing and trace routing before substitution. Electrical specifications are compatible: both feature 2 circuits, 45 nA input bias current (BA2904F-E2 specifies 20 nA), and 3 V minimum supply voltage.
Q4: Why do Texas Instruments LM2904 variants show lower input bias current (20 nA) than the KA2904D (45 nA)?
A: Lower input bias current indicates improved device performance and represents a design enhancement. The KA2904D specification of 45 nA is the maximum allowable value. Texas Instruments LM2904AVQDR and LM2904AVQDRG4Q1 variants achieve 20 nA maximum input bias current through superior semiconductor processing. This lower value is fully compatible with circuits designed for 45 nA, as it represents better performance. No circuit modifications are required.
Q5: Can I use LM358DR2G as a substitute for KA2904D?
A: LM358DR2G is not recommended as a direct substitute due to operating temperature limitations. The LM358DR2G operates from 0°C to 70°C, while the KA2904D operates from -40°C to 85°C. If your application requires operation below 0°C or above 70°C, LM358DR2G will not function within specification. For applications operating within 0°C to 70°C range, LM358DR2G is electrically compatible (2 circuits, 45 nA input bias, 3 V to 32 V supply range, 8-SOIC package).
Q6: What does "Last Time Buy" status mean for LM2904QDRG4?
A: "Last Time Buy" indicates that Texas Instruments has announced end-of-life for this part number. Existing inventory may be available for a limited period, but production has ceased or will cease. For new designs or long-term production requirements, select parts with "Active" product status such as LM2904DR2G, LM2904VDR2G, or LM2904AVQDRG4Q1. Last Time Buy parts are suitable only for immediate replacement needs or short-term production runs.
Q7: What is the significance of RoHS3 compliance and REACH Unaffected status?
A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance certifies that the device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above specified thresholds. REACH Unaffected status indicates the device is not subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) restrictions. All recommended substitute parts carry both certifications, ensuring compliance with European Union environmental regulations and facilitating global distribution.
Q8: Is the automotive-grade LM2904AVQDRG4Q1 suitable for non-automotive applications?
A: Yes. The LM2904AVQDRG4Q1 carries AEC-Q100 automotive qualification, which represents rigorous testing standards exceeding typical industrial requirements. This part is fully suitable for industrial, consumer, and commercial applications. The automotive qualification provides additional assurance of reliability and performance consistency. Use this variant when maximum reliability and extended temperature operation (-40°C to 125°C) are required, regardless of application sector.
Q9: How do I verify package compatibility before substitution?
A: Confirm the following specifications match your PCB design: (1) Package type: 8-SOIC or 8-SOP; (2) Package width: 0.154" (3.90mm) for 8-SOIC or 0.173" (4.40mm) for 8-SOP; (3) Pin pitch: standard 1.27mm (0.050") for both package types; (4) Lead form: gull-wing leads for surface mount. Consult the device datasheet for detailed package drawings. Most 8-SOIC and 8-SOP packages are mechanically interchangeable on standard PCB layouts, but verify pad spacing in your specific design.
Q10: What inventory considerations should I evaluate when selecting a substitute?
A: Inventory availability directly impacts supply chain reliability and lead time. LM2904DR2G (505,300 pcs), LM358DR2G (492,200 pcs), and NCV2904DR2G (655,300 pcs) offer substantial inventory, ensuring short lead times and price stability. LM2904VDR2G (48,685 pcs) and LM2904AVQDR (35,200 pcs) provide adequate inventory for most applications. LM2904AVQDRG4Q1 (5,400 pcs) and LM2904QDRG4 (1,015 pcs) have limited inventory; verify availability before committing to production schedules. For long-term production programs, prioritize parts with Active status and inventory exceeding 50,000 units.
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