LM224DR2 Equivalent & Substitute Parts

Part Overview

The LM224DR2 is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a quad amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, indicating it is no longer in active production. The LM224DR2 operates across a wide supply voltage range of 3V to 32V and is suitable for applications requiring low-power, general-purpose amplification with four independent circuits on a single die.

Due to its obsolete status, sourcing new units from the original manufacturer is limited. Equivalent and substitute parts are necessary to maintain design continuity, ensure long-term component availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility across key parameters including gain-bandwidth product, input bias current, input offset voltage, output current capability, and supply voltage range.

Key Parameters

Parameter	LM224DR2 Value	Unit	Criticality for Substitution
Amplifier Type	General Purpose	—	Critical
Number of Circuits	4	Circuits	Critical
Gain Bandwidth Product	1 MHz	MHz	Critical
Current - Input Bias	90 nA	nA	Important
Voltage - Input Offset	2 mV	mV	Important
Current - Output / Channel	40 mA	mA	Critical
Voltage - Supply Span (Min)	3 V	V	Critical
Voltage - Supply Span (Max)	32 V	V	Critical
Operating Temperature	-25°C ~ 85°C	°C	Important
Package / Case	14-SOIC (0.154", 3.90mm Width)	—	Critical
Mounting Type	Surface Mount	—	Critical

Substitute Part Grouping Explanation

Substitute parts for the LM224DR2 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical or near-identical electrical specifications and package configurations, allowing pin-for-pin replacement without circuit modification. These parts satisfy all critical parameters: four circuits, 1 MHz gain-bandwidth product, 40 mA output current per channel, 3V to 32V supply voltage range, and 14-SOIC package format.

Similar Substitutes share the same package and general-purpose amplifier classification but may exhibit variations in secondary parameters such as slew rate, input bias current, supply current, or operating temperature range. These parts are suitable for applications where the specific parameter variations do not impact circuit performance, but design verification is required to confirm compatibility with the intended application.

The following parameters determine substitution eligibility:

Four independent amplifier circuits
General-purpose amplifier topology
14-SOIC surface mount package
Supply voltage range encompassing 3V minimum and 32V maximum
Output current capability of 40 mA per channel or greater
Gain-bandwidth product of 1 MHz or greater

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Number of Circuits	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
LM224DR2	onsemi	Obsolete	General Purpose	4	1	90	2	40	3	32	-25 ~ 85	14-SOIC
LM224DR2G	onsemi	Active	General Purpose	4	1	90	2	40	3	32	-25 ~ 85	14-SOIC
LM224DRG3	Texas Instruments	Last Time Buy	General Purpose	4	1.2	20	3	30	3	30	-25 ~ 85	14-SOIC
AS324MTR-G1	Diodes Incorporated	Active	General Purpose	4	—	20	2	40	3	36	-40 ~ 85	14-SOIC
LF347BD	Texas Instruments	Obsolete	J-FET	4	3	0.05	3	31	7	36	0 ~ 70	14-SOIC
LM248D	STMicroelectronics	Obsolete	General Purpose	4	1	30	1	25	44	44	-40 ~ 105	14-SOIC
LM2902QS14-13	Diodes Incorporated	Active	General Purpose	4	0.7	20	2	40	2	36	-40 ~ 125	14-SOIC
LM2902S14-13	Diodes Incorporated	Active	General Purpose	4	0.7	20	2	40	3	36	-40 ~ 125	14-SOIC
LM2902WYDT	STMicroelectronics	Active	General Purpose	4	1.3	20	2	40	3	30	-40 ~ 125	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	General Purpose	4	1	45	2	40	3	32	0 ~ 70	14-SOIC
LM324D	STMicroelectronics	Active	General Purpose	4	1.2	20	2	40	3	30	0 ~ 70	14-SOIC

Engineering Selection Recommendations

Direct Substitute - Recommended First Choice:

LM224DR2G (onsemi) is the optimal direct substitute for the LM224DR2. This part maintains identical electrical specifications across all critical parameters: 1 MHz gain-bandwidth product, 90 nA input bias current, 2 mV input offset voltage, 40 mA output current per channel, and 3V to 32V supply voltage range. The LM224DR2G is in active production status with substantial inventory availability (105,200 units), ensuring long-term supply continuity. Both parts share the same 14-SOIC package and surface mount configuration. The LM224DR2G carries ROHS3 compliance, providing regulatory advantage over the non-compliant original part.

Alternative Direct Substitute:

LM324AMX/NOPB (Texas Instruments) provides direct electrical compatibility with identical 1 MHz gain-bandwidth product, 2 mV input offset voltage, and 40 mA output current per channel. This part is in active production with high inventory availability (36,756 units). The supply voltage range of 3V to 32V matches the original specification. Operating temperature range differs at 0°C to 70°C versus the original -25°C to 85°C; this substitution is suitable for applications operating within the 0°C to 70°C window. ROHS3 compliance is confirmed.

Similar Substitute - Extended Temperature Range:

LM2902WYDT (STMicroelectronics) offers extended operating temperature range (-40°C to 125°C) and active production status. This part maintains 40 mA output current per channel and 3V to 30V supply voltage range. The gain-bandwidth product is 1.3 MHz, exceeding the original 1 MHz specification. Input bias current is 20 nA and input offset voltage is 2 mV, both within acceptable tolerance. This part includes AEC-Q100 automotive qualification and push-pull output configuration. Suitable for applications requiring extended temperature operation.

Similar Substitute - Wide Supply Voltage:

AS324MTR-G1 (Diodes Incorporated) extends the maximum supply voltage to 36V while maintaining the 3V minimum. This part is in active production with high inventory (196,751 units). Input bias current is 20 nA and input offset voltage is 2 mV. Output current capability is 40 mA per channel. Operating temperature range extends to -40°C to 85°C. Suitable for applications requiring supply voltages above 32V.

Not Recommended:

LF347BD is a J-FET amplifier with fundamentally different topology and operating characteristics. Minimum supply voltage requirement of 7V exceeds the original 3V specification, making it unsuitable for low-voltage applications. Operating temperature range of 0°C to 70°C is narrower than the original. This part is obsolete.

LM248D exhibits a fixed supply voltage specification of 44V, incompatible with the original 3V to 32V range. This part is obsolete and unsuitable for general substitution.

LM224DRG3 (Texas Instruments) is in last-time-buy status, indicating imminent discontinuation. While electrically similar, this status makes it unsuitable for long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can LM224DR2G be used as a direct replacement for LM224DR2 without circuit modification?

A: Yes. LM224DR2G maintains identical electrical specifications and package configuration. Pin-for-pin replacement is supported without circuit modification. Both parts are quad general-purpose amplifiers in 14-SOIC packages with matching supply voltage ranges, output current capabilities, and frequency response characteristics.

Q: What is the primary difference between LM224DR2 and LM324AMX/NOPB?

A: The primary difference is operating temperature range. LM224DR2 operates from -25°C to 85°C, while LM324AMX/NOPB operates from 0°C to 70°C. All other critical electrical parameters are identical: 1 MHz gain-bandwidth product, 2 mV input offset voltage, 40 mA output current per channel, and 3V to 32V supply voltage range. Substitution is valid for applications operating within the 0°C to 70°C window.

Q: Why is LF347BD not recommended as a substitute?

A: LF347BD is a J-FET amplifier with fundamentally different input characteristics and operating requirements. The minimum supply voltage is 7V, incompatible with the original 3V specification. Input bias current is 50 pA versus 90 nA in the original, indicating different input stage topology. Operating temperature range is 0°C to 70°C, narrower than the original. This part is obsolete and suitable only for applications specifically designed for J-FET amplifier characteristics.

Q: Is the LM2902WYDT suitable for automotive applications?

A: LM2902WYDT carries AEC-Q100 automotive qualification and is suitable for automotive applications. This part includes extended operating temperature range of -40°C to 125°C and push-pull output configuration. Electrical parameters are compatible with the original LM224DR2 across critical specifications. Inventory availability is confirmed at 5,439 units.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS3 compliance indicates the part meets current environmental and regulatory standards for lead-free manufacturing and restricted hazardous substances. The original LM224DR2 is RoHS non-compliant. All recommended substitutes carry ROHS3 compliance, providing regulatory advantage for new designs and supporting compliance with procurement standards in regulated industries.

Q: Can LM2902QS14-13 be used in applications requiring the full -25°C to 85°C temperature range?

A: No. LM2902QS14-13 operates from -40°C to 125°C, which exceeds the original range at the lower end but does not restrict operation within the original -25°C to 85°C window. However, this part is qualified for automotive applications (AEC-Q100) and includes extended temperature capability. For applications requiring operation specifically at -25°C, this part is suitable. For applications requiring operation below -25°C, this part is not suitable.

Q: What packaging considerations apply when substituting these parts?

A: All recommended substitutes use the 14-SOIC surface mount package with 0.154-inch (3.90mm) width, matching the original LM224DR2 package. Pin configuration and footprint are identical across all substitutes. PCB layout modifications are not required. Reflow soldering parameters should follow the substitute manufacturer's specifications, which typically align with standard 14-SOIC package requirements.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. LM224DR2G has the highest inventory availability at 105,200 units, ensuring immediate availability and long-term supply continuity. LM324AMX/NOPB has 36,756 units available. AS324MTR-G1 has 196,751 units available. These high inventory levels support production requirements without supply chain risk. Parts in last-time-buy or obsolete status should be avoided for new designs requiring long-term component availability.

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