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LM224WDT Equivalent & Substitute Parts
Part Overview
The LM224WDT is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit push-pull amplifier in a 14-SOIC surface mount package. This device is classified as Active product status and is ROHS3 compliant. The LM224WDT operates across a wide supply voltage range of 3V to 30V and maintains performance across the industrial temperature range of -40°C to 105°C. Substitute parts are identified based on matching functional architecture (4-circuit general-purpose amplifier configuration), identical package form factor (14-SOIC), and compatible electrical operating parameters within specified tolerances.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Output Type | Push-Pull | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Slew Rate | 0.4 | V/µs |
| Gain Bandwidth Product | 1.3 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 2 | mV |
| Current - Supply | 1.5 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | -40°C ~ 105°C | — |
| RoHS Status | ROHS3 Compliant | — |
| REACH Status | REACH Unaffected | — |
Substitute Part Grouping Explanation
Substitution eligibility for the LM224WDT is determined by the following critical parameters:
Primary Matching Criteria:
- Amplifier Type: General Purpose
- Number of Circuits: 4
- Package / Case: 14-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
Secondary Electrical Compatibility Criteria:
- Voltage - Supply Span (Min): 3V minimum
- Voltage - Supply Span (Max): 30V maximum
- Operating Temperature Range: Must encompass or overlap -40°C to 105°C
- Current - Output / Channel: Must support minimum 40 mA
- Slew Rate: 0.4 V/µs or greater
- Gain Bandwidth Product: 1.3 MHz or greater
Compliance Requirements:
- RoHS3 Compliant
- REACH Unaffected
Substitute parts are grouped into two categories based on electrical performance characteristics: direct functional equivalents with matching or superior electrical specifications, and alternative general-purpose 4-circuit amplifiers with compatible but distinct performance profiles. All substitute parts maintain identical package geometry and surface mount configuration to ensure mechanical and electrical compatibility in PCB layouts.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Number of Circuits | Slew Rate (V/µs) | Gain Bandwidth Product (MHz) | Current - Input Bias (nA) | Voltage - Input Offset (mV) | Current - Supply (mA) | Current - Output / Channel (mA) | Voltage - Supply Min (V) | Voltage - Supply Max (V) | Operating Temperature (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM224WDT | STMicroelectronics | General Purpose | 4 | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 ~ 105 | Active | ROHS3 |
| ADA4004-4ARZ | Analog Devices Inc. | General Purpose | 4 | 2.7 | 12 | 40 | 0.04 | — | 10 | 10 | 30 | -40 ~ 125 | Active | ROHS3 |
| ADA4004-4ARZ-R7 | Analog Devices Inc. | General Purpose | 4 | 2.7 | 12 | 40 | 0.04 | — | 10 | 10 | 30 | -40 ~ 125 | Active | ROHS3 |
| LM224AD | STMicroelectronics | General Purpose | 4 | 0.4 | 1.2 | 20 | 2 | 1.5 | 30 | 3 | 30 | -40 ~ 105 | Obsolete | ROHS3 |
| LM224ADR | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 ~ 85 | Active | ROHS3 |
| LM224ADRG4 | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 ~ 85 | Obsolete | ROHS3 |
| LM224D | STMicroelectronics | General Purpose | 4 | 0.4 | 1.2 | 20 | 2 | 1.5 | 40 | 3 | 30 | -40 ~ 105 | Active | ROHS3 |
| LM224KAD | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 ~ 85 | Last Time Buy | ROHS3 |
| LM224KADR | Texas Instruments | General Purpose | 4 | 0.5 | 1.2 | 15 | 2 | 1.4 | 30 | 3 | 30 | -25 ~ 85 | Active | ROHS3 |
| LM248DR | Texas Instruments | General Purpose | 4 | 0.5 | 1 | 30 | 1 | 2.4 | 25 | 8 | 36 | -25 ~ 85 | Active | ROHS3 |
| LM2900D | Texas Instruments | General Purpose | 4 | 20 | 2.5 | 30 | — | 6.2 | 18 | 4.4 | 32 | -40 ~ 85 | Active | ROHS3 |
Engineering Selection Recommendations
Direct Functional Equivalents (Preferred Category):
The LM224D (STMicroelectronics, Active status) is the primary direct substitute for the LM224WDT. Both devices share identical electrical specifications including slew rate (0.4 V/µs), gain bandwidth product (1.3 MHz vs. 1.2 MHz), input bias current (20 nA), input offset voltage (2 mV), supply current (1.5 mA), output current per channel (40 mA), and operating temperature range (-40°C to 105°C). The LM224D is available in Tube packaging and maintains Active product status with ROHS3 compliance and REACH Unaffected designation.
Compatible Alternatives (Secondary Category):
The LM224ADR and LM224KADR (Texas Instruments, Active status) provide functional compatibility with the LM224WDT within the specified 14-SOIC package. These devices operate across the 3V to 30V supply range and maintain ROHS3 compliance. However, the operating temperature range is restricted to -25°C to 85°C, which does not encompass the full -40°C to 105°C specification of the LM224WDT. Output current per channel is reduced to 30 mA compared to the 40 mA specification of the LM224WDT. These parts are suitable for applications where the narrower temperature range and reduced output current are acceptable.
Enhanced Performance Alternative:
The ADA4004-4ARZ and ADA4004-4ARZ-R7 (Analog Devices Inc., Active status) offer superior electrical performance with slew rate of 2.7 V/µs and gain bandwidth product of 12 MHz. These devices operate across -40°C to 125°C, exceeding the LM224WDT temperature specification. However, the minimum supply voltage is 10V, which exceeds the 3V minimum of the LM224WDT, and output current per channel is limited to 10 mA. These parts are suitable for applications requiring higher bandwidth and extended temperature operation where the higher minimum supply voltage and reduced output current are compatible with circuit requirements.
Obsolete Status Parts:
The LM224AD (STMicroelectronics, Obsolete status) and LM224ADRG4 (Texas Instruments, Obsolete status) are not recommended for new designs. The LM224KAD (Texas Instruments, Last Time Buy status) is approaching end-of-life and should not be selected for new production applications.
Limited Compatibility Alternative:
The LM248DR (Texas Instruments, Active status) and LM2900D (Texas Instruments, Active status) are general-purpose 4-circuit amplifiers in 14-SOIC packages with ROHS3 compliance. The LM248DR requires minimum 8V supply voltage and provides 25 mA output current per channel. The LM2900D requires minimum 4.4V supply voltage and provides 18 mA output current per channel. Both devices have operating temperature ranges of -25°C to 85°C. These parts are suitable only for applications where the higher minimum supply voltage and reduced output current specifications are acceptable.
Frequently Asked Questions (FAQ)
Q: Can the LM224D be used as a direct replacement for the LM224WDT?
A: Yes. The LM224D is a direct functional equivalent. Both devices share identical electrical specifications including slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, output current per channel, and operating temperature range. Both are packaged in 14-SOIC surface mount configuration and maintain ROHS3 compliance. The LM224D is available in Tube packaging and maintains Active product status.
Q: What is the primary limitation of the LM224ADR and LM224KADR as substitutes?
A: The operating temperature range is restricted to -25°C to 85°C, which does not encompass the full -40°C to 105°C specification of the LM224WDT. Additionally, output current per channel is reduced to 30 mA compared to the 40 mA specification of the LM224WDT. These parts are suitable only for applications where the narrower temperature range and reduced output current are acceptable.
Q: Why is the ADA4004-4ARZ not a direct substitute despite superior performance?
A: The ADA4004-4ARZ has a minimum supply voltage requirement of 10V, which exceeds the 3V minimum of the LM224WDT. Output current per channel is limited to 10 mA, significantly below the 40 mA specification of the LM224WDT. While the device offers superior slew rate (2.7 V/µs) and gain bandwidth product (12 MHz), it is suitable only for applications where the higher minimum supply voltage and reduced output current are compatible with circuit requirements.
Q: Are all substitute parts available in the same package configuration?
A: Yes. All substitute parts listed are packaged in 14-SOIC (0.154", 3.90mm Width) surface mount configuration, ensuring mechanical and electrical compatibility in PCB layouts. Packaging format (Tube, Cut Tape & Digi-Reel, Tape & Reel) varies by part number and supplier, but the physical package dimensions are identical.
Q: Should I use parts with Obsolete or Last Time Buy status?
A: No. Parts with Obsolete status (LM224AD, LM224ADRG4) and Last Time Buy status (LM224KAD) are not recommended for new designs. These designations indicate that the manufacturer has discontinued or will discontinue production. For new production applications, select only parts with Active product status.
Q: What is the significance of ROHS3 compliance and REACH Unaffected status?
A: ROHS3 compliance indicates that the device meets the Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. REACH Unaffected status indicates that the device is not subject to the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulation. All substitute parts listed maintain both ROHS3 compliance and REACH Unaffected designation, ensuring regulatory compatibility with the LM224WDT.
Q: Can the LM248DR or LM2900D be used in applications designed for the LM224WDT?
A: The LM248DR and LM2900D are general-purpose 4-circuit amplifiers in 14-SOIC packages, but they have significant electrical differences. The LM248DR requires minimum 8V supply voltage and provides 25 mA output current per channel. The LM2900D requires minimum 4.4V supply voltage and provides 18 mA output current per channel. Both have operating temperature ranges of -25°C to 85°C. These parts are suitable only for applications where the higher minimum supply voltage and reduced output current specifications are acceptable.
Q: What parameters should I verify when selecting a substitute part?
A: Verify the following parameters against your circuit requirements: (1) Voltage - Supply Span (Min and Max) must be compatible with your power supply; (2) Current - Output / Channel must support your load requirements; (3) Operating Temperature range must encompass your application environment; (4) Slew Rate and Gain Bandwidth Product must meet your signal processing requirements; (5) Input Bias Current and Input Offset Voltage must be acceptable for your input signal conditioning; (6) Package configuration must match your PCB layout.
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