LM224KDG4 Equivalent & Substitute Parts

Part Overview

The LM224KDG4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in 14-SOIC surface-mount packaging. This part is classified as obsolete, with 832 units currently in stock. The LM224KDG4 operates across a wide supply voltage range (3V to 30V) and is suitable for general analog signal processing applications requiring moderate bandwidth and slew rate performance. Due to its obsolete status, equivalent and substitute parts with active product status are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	LM224KDG4	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.5	V/µs
Gain Bandwidth Product	1.2	MHz
Current - Input Bias	20	nA
Voltage - Input Offset	3	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	-25°C ~ 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 LM224KDG4 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Number of circuits: 4 channels
Package type: 14-SOIC surface-mount configuration
Supply voltage range: Minimum 3V, maximum ≥30V
Mounting type: Surface mount
RoHS and REACH compliance status

Performance Parameters Defining Substitution Classes:

Gain bandwidth product: 1.2 MHz (primary performance metric)
Slew rate: 0.5 V/µs (signal fidelity requirement)
Input bias current: 20 nA (input impedance characteristic)
Input offset voltage: 3 mV (DC accuracy)
Output current per channel: 30 mA (load driving capability)
Supply current: 1.4 mA across 4 channels (power consumption)

Substitute parts are grouped into two categories based on product status and performance alignment:

Category A - Active Status Substitutes (Recommended for New Designs): Parts with active product status that maintain electrical compatibility within the specified parameter ranges. These include LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB, LP324M/NOPB, and LP324MX/NOPB.

Category B - Obsolete Status Substitutes (Direct Equivalents): Parts with obsolete status that provide direct functional equivalence. These include LM2902DR and LM224DR2G.

Category C - Alternative Substitutes (Different Package Geometry): Parts with different package dimensions but compatible electrical specifications. These include BA10324AF-E2 and BA2902F-E2, which use 14-SOP packaging (0.173", 4.40mm width) instead of 14-SOIC (0.154", 3.90mm width).

Parameter Comparison

Part Number	Manufacturer	Product Status	GBW (MHz)	Slew Rate (V/µs)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
LM224KDG4	Texas Instruments	Obsolete	1.2	0.5	20	3	1.4	30	3	30	-25 ~ 85	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	1.2	0.3	20	1	1	30	3	32	-40 ~ 125	14-SOPJ
LM324AM/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.1	0.05	2	2	0.085	10	3	32	0 ~ 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.1	0.05	2	2	0.085	10	3	32	0 ~ 70	14-SOIC
LM224DR2G	onsemi	Active	1	—	90	2	—	40	3	32	-25 ~ 85	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.5	0.2	20	2	0.6	35	3	32	-40 ~ 85	14-SOP
BA2902F-E2	Rohm Semiconductor	Active	0.5	0.2	20	2	0.7	30	3	32	-40 ~ 125	14-SOP

Engineering Selection Recommendations

For New Design Implementation:

Select LM324AMX/NOPB or LM324MX/NOPB as primary substitutes. Both parts are manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain stability. These parts maintain the 14-SOIC package geometry identical to the LM224KDG4, enabling direct PCB footprint compatibility. Both are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The LM324 series operates within the required 3V to 32V supply range and provides 40 mA output current per channel, exceeding the original 30 mA specification. Operating temperature range is 0°C to 70°C, which is narrower than the original -25°C to 85°C but suitable for most commercial applications.

For Extended Temperature Range Applications:

LM224DR2G (onsemi) maintains the original -25°C to 85°C operating temperature range with active product status. This part uses identical 14-SOIC packaging and provides 1 MHz gain bandwidth product matching the original specification. Supply voltage range extends to 32V maximum, compatible with the original 30V maximum.

For Low-Power Applications:

LP324MX/NOPB or LP324M/NOPB offer significantly reduced supply current (85 µA versus 1.4 mA), suitable for battery-powered or energy-constrained designs. These parts maintain 14-SOIC packaging and 3V to 32V supply range. Gain bandwidth product is reduced to 100 kHz and output current per channel is limited to 10 mA, requiring application-level verification of performance adequacy.

For Alternative Package Geometry:

BA10324AF-E2 and BA2902F-E2 provide functional equivalence with 14-SOP packaging (0.173", 4.40mm width) instead of 14-SOIC (0.154", 3.90mm width). These parts require PCB layout modification and are suitable only when package geometry change is acceptable. Both are active products with ROHS3 compliance.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, consistent with the original LM224KDG4. Moisture sensitivity level remains MSL 1 (unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can LM324AMX/NOPB directly replace LM224KDG4 without PCB modification?

A: Yes. Both parts use identical 14-SOIC packaging (0.154", 3.90mm width) and surface-mount configuration. Pinout compatibility is maintained. No PCB layout changes are required. Electrical parameter differences are within acceptable tolerance for general-purpose amplifier applications.

Q: What is the primary difference between LM324 and LP324 series substitutes?

A: The LP324 series (LP324M/NOPB, LP324MX/NOPB) is optimized for low-power operation with 85 µA supply current versus 1.5 mA for LM324 series. LP324 provides 100 kHz gain bandwidth product and 10 mA output current per channel, compared to 1 MHz and 40 mA for LM324. LP324 is suitable only for applications where reduced bandwidth and output current are acceptable.

Q: Why is the operating temperature range different between LM224KDG4 (-25°C to 85°C) and LM324AMX/NOPB (0°C to 70°C)?

A: These represent different product grades within the same base device family. LM224 is specified for extended industrial temperature range, while LM324 is specified for commercial temperature range. Selection depends on application environment requirements. For extended temperature operation, use LM224DR2G (onsemi) which maintains -25°C to 85°C range.

Q: Are BA10324AF-E2 and BA2902F-E2 pin-compatible with LM224KDG4?

A: Both parts are 4-circuit general-purpose amplifiers in 14-pin surface-mount packages with identical pinout. However, package geometry differs: BA10324AF-E2 and BA2902F-E2 use 14-SOP (0.173", 4.40mm width) versus 14-SOIC (0.154", 3.90mm width) for LM224KDG4. PCB footprint modification is required. Use only when package change is acceptable.

Q: What is the significance of the 1 MHz versus 0.5 MHz gain bandwidth product difference?

A: Gain bandwidth product determines the maximum frequency at which the amplifier can operate at unity gain. LM224KDG4 specifies 1.2 MHz, while BA10324AF-E2 and BA2902F-E2 specify 0.5 MHz. For applications requiring bandwidth above 500 kHz, use LM324 series (1 MHz) or LM2902DR (1.2 MHz) instead of Rohm alternatives.

Q: Is LM2902DR (Rohm Semiconductor) a suitable substitute despite obsolete status?

A: LM2902DR is classified as obsolete but provides direct functional equivalence with 1.2 MHz gain bandwidth product and 20 nA input bias current matching the original. It uses 14-SOPJ packaging instead of 14-SOIC, requiring PCB modification. For new designs, prefer active-status alternatives (LM324 series). LM2902DR is suitable only for legacy system maintenance where supply is available.

Q: What packaging format differences exist among substitute options?

A: Three package types are represented: 14-SOIC (0.154", 3.90mm width) used by LM224KDG4, LM324 series, and LP324 series; 14-SOPJ used by LM2902DR; and 14-SOP (0.173", 4.40mm width) used by BA10324AF-E2 and BA2902F-E2. Only 14-SOIC substitutes enable direct PCB footprint compatibility without layout modification.

Q: How does input bias current affect substitution suitability?

A: Input bias current determines input impedance and affects circuit performance in high-impedance applications. LM224KDG4 specifies 20 nA. LM324 series specifies 45 nA (higher), while LP324 series specifies 2 nA (lower). For applications sensitive to input bias current, verify that the substitute specification is acceptable for the circuit design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original LM224KDG4. Moisture sensitivity level is MSL 1 (unlimited) across all alternatives, indicating no special storage or handling requirements.

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