LM432MA Equivalent & Substitute Parts

Part Overview

The LM432MA is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 2-circuit integrated circuit in 8-SOIC surface mount packaging. This device is classified as obsolete, indicating discontinued production and limited availability in the market. The LM432MA operates across a supply voltage range of 2.5 V to 16 V with an operating temperature range of -40°C to 85°C, making it suitable for low-power analog signal processing applications.

Due to its obsolete status, sourcing original LM432MA units presents supply chain challenges. Equivalent and substitute parts are necessary to maintain design continuity, ensure long-term component availability, and support production requirements. Substitute devices must maintain functional compatibility through matching electrical parameters, package form factor, and circuit performance characteristics.

Key Parameters

Parameter	LM432MA Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Gain Bandwidth Product	1	MHz
Current - Input Bias	3	nA
Voltage - Input Offset	600	µV
Current - Supply	150 (x2 Channels)	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	2.5	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LM432MA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 2 (dual-channel configuration)
Package form factor: 8-SOIC surface mount
Supply voltage range compatibility: Minimum 2.5 V, Maximum 16 V
Operating temperature range: Must encompass or exceed -40°C to 85°C
Output current per channel: Minimum 30 mA
Input bias current: Maximum 3 nA (lower values acceptable)
Voltage input offset: Maximum 600 µV (lower values acceptable)

Substitute Categories:

Category 1: Direct Electrical Equivalents (LM432MA/NOPB) The LM432MA/NOPB variant maintains identical electrical specifications with packaging in Tube format. This part is RoHS3 compliant, addressing regulatory requirements while preserving functional compatibility.

Category 2: CMOS Amplifier Substitutes (TS272 Series) The TS272ACDT, TS272AIDT, TS272BIDT, TS272CDT, and TS272IDT are CMOS-based 2-circuit amplifiers in 8-SOIC packaging. These devices operate within the 3 V to 16 V supply range, encompassing the LM432MA specification. CMOS architecture provides superior input bias current (1 pA) and enhanced slew rate (5.5 V/µs) compared to the general-purpose LM432MA. All TS272 variants are active products with RoHS3 compliance.

Category 3: Low-Power CMOS Substitutes (TS27L2 Series) The TS27L2ACDT, TS27L2AIDT, and TS27L2BIDT are low-power CMOS amplifiers featuring reduced supply current (10 µA per channel versus 150 µA). These devices maintain 8-SOIC packaging and 3 V to 16 V supply compatibility. The TS27L2 series exhibits lower gain bandwidth product (100 kHz) and slew rate (0.04 V/µs), suitable for applications where bandwidth is not critical and power consumption is prioritized.

Category 4: J-FET Amplifier Substitute (TL072CDT) The TL072CDT is a J-FET based 2-circuit amplifier offering enhanced performance characteristics including 4 MHz gain bandwidth product, 16 V/µs slew rate, and 6 V to 36 V supply range. This device is AEC-Q100 qualified for automotive applications and RoHS3 compliant. The TL072CDT operates at 0°C to 70°C, which does not extend to the full -40°C lower temperature limit of the LM432MA.

Parameter Comparison

Parameter	LM432MA	LM432MA/NOPB	TL072CDT	TS272ACDT	TS272BIDT	TS27L2BIDT
Amplifier Type	General Purpose	General Purpose	J-FET	CMOS	CMOS	CMOS
Number of Circuits	2	2	2	2	2	2
Gain Bandwidth Product (MHz)	1	1	4	3.5	3.5	0.1
Slew Rate (V/µs)	—	—	16	5.5	5.5	0.04
Current - Input Bias (pA/nA)	3 nA	3 nA	20 pA	1 pA	1 pA	1 pA
Voltage - Input Offset (mV/µV)	600 µV	600 µV	3 mV	900 µV	250 µV	250 µV
Current - Supply (mA/µA)	150 µA	150 µA	1.4 mA	1 mA	1 mA	10 µA
Current - Output / Channel (mA)	30	30	40	45	45	45
Voltage - Supply Span Min (V)	2.5	2.5	6	3	3	3
Voltage - Supply Span Max (V)	16	16	36	16	16	16
Operating Temperature (°C)	-40 to 85	-40 to 85	0 to 70	0 to 70	-40 to 125	-40 to 125
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Regulatory Compliance: The LM432MA/NOPB is the primary substitute when exact electrical equivalence is required. This variant maintains all electrical specifications of the original LM432MA while providing RoHS3 compliance. Current inventory of 869 pieces supports immediate procurement. This option is suitable for applications where design validation has been completed on the LM432MA platform and regulatory requirements mandate RoHS compliance.

For Active Product Status with Enhanced Performance: The TS272BIDT and TS272IDT are recommended when active product status and extended temperature range (-40°C to 125°C) are required. Both devices maintain 8-SOIC packaging and 3 V to 16 V supply compatibility. The TS272BIDT features improved input offset voltage (250 µV) and higher output current (45 mA) compared to the LM432MA. Inventory availability is 1,977 pieces (TS272BIDT) and 21,553 pieces (TS272IDT), ensuring supply continuity.

For Low-Power Applications: The TS27L2BIDT is selected when supply current reduction is a design priority. This device operates at 10 µA per channel, reducing power consumption by 93% compared to the LM432MA. The TS27L2BIDT maintains -40°C to 125°C operating range and RoHS3 compliance. This substitution is appropriate only when the application bandwidth requirement does not exceed 100 kHz.

For Automotive-Grade Applications: The TL072CDT is specified when AEC-Q100 automotive qualification is required. This J-FET amplifier provides superior performance metrics including 4 MHz gain bandwidth product and 16 V/µs slew rate. The TL072CDT operates at 6 V to 36 V supply range, exceeding the LM432MA specification. Operating temperature range is 0°C to 70°C, which does not encompass the full -40°C lower limit of the original device. Inventory of 203,200 pieces ensures availability.

Regulatory Compliance Consideration: All recommended substitutes are RoHS3 compliant, addressing environmental and regulatory requirements. The original LM432MA is RoHS non-compliant; therefore, any new design implementation or production continuation must incorporate a compliant substitute.

Frequently Asked Questions (FAQ)

Q1: Can the LM432MA/NOPB be used as a direct drop-in replacement for the LM432MA?

A: Yes. The LM432MA/NOPB maintains identical electrical specifications including gain bandwidth product (1 MHz), input bias current (3 nA), input offset voltage (600 µV), supply current (150 µA per channel), and output current (30 mA per channel). Both devices operate across -40°C to 85°C and accept 2.5 V to 16 V supply voltage. The primary difference is packaging format (Tube versus unspecified) and RoHS3 compliance status. Pin configuration and 8-SOIC form factor are identical, enabling direct substitution without circuit modification.

Q2: What are the key differences between the TS272 series and the LM432MA?

A: The TS272 series employs CMOS architecture, whereas the LM432MA is a general-purpose amplifier. CMOS variants offer superior input bias current (1 pA versus 3 nA), higher slew rate (5.5 V/µs versus unspecified), and greater gain bandwidth product (3.5 MHz versus 1 MHz). Supply current is higher in TS272 devices (1 mA per channel versus 150 µA). Output current capability is enhanced (45 mA versus 30 mA). All TS272 variants maintain 8-SOIC packaging and operate within the 3 V to 16 V supply range, which encompasses the LM432MA specification. TS272 devices are active products with RoHS3 compliance.

Q3: Is the TL072CDT suitable for applications requiring -40°C operation?

A: No. The TL072CDT operates across 0°C to 70°C, which does not extend to the -40°C lower temperature limit specified for the LM432MA. Applications requiring full -40°C to 85°C temperature range operation must select alternatives such as TS272BIDT, TS272IDT, or TS27L2BIDT, which support -40°C to 125°C operation. The TL072CDT is appropriate only for applications with 0°C minimum operating temperature requirements.

Q4: When should the TS27L2BIDT be selected over other substitutes?

A: The TS27L2BIDT is selected when power consumption minimization is the primary design objective and bandwidth requirements do not exceed 100 kHz. This device operates at 10 µA per channel supply current, representing 93% reduction compared to the LM432MA (150 µA per channel). The TS27L2BIDT maintains -40°C to 125°C operating range, 8-SOIC packaging, and 3 V to 16 V supply compatibility. Applications such as battery-powered instrumentation, remote sensors, and low-frequency signal conditioning benefit from this substitution. The reduced gain bandwidth product (100 kHz) and slew rate (0.04 V/µs) preclude use in high-frequency or high-speed applications.

Q5: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All recommended substitutes are packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration, matching the LM432MA form factor. This ensures mechanical compatibility with existing printed circuit board layouts and assembly processes. Supplier device package designations may vary (8-SOIC versus 8-SO), but physical dimensions and pin assignments remain compatible for direct substitution.

Q6: What is the significance of RoHS3 compliance for substitute selection?

A: RoHS3 compliance indicates conformance to Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials in electronic components. The original LM432MA is RoHS non-compliant. All recommended substitutes (LM432MA/NOPB, TL072CDT, TS272 series, TS27L2 series) are RoHS3 compliant. For applications subject to environmental regulations, procurement standards, or customer requirements mandating RoHS compliance, substitute selection must prioritize compliant devices. RoHS3 compliance does not affect electrical functionality or circuit performance.

Q7: Can the TS272ACDT replace the LM432MA in all applications?

A: The TS272ACDT is electrically compatible with the LM432MA within the specified parameter ranges. However, operating temperature range differs: TS272ACDT operates 0°C to 70°C, whereas LM432MA operates -40°C to 85°C. Applications requiring full -40°C operation must select TS272BIDT or TS272IDT variants, which support -40°C to 125°C. For applications operating within 0°C to 70°C, the TS272ACDT is suitable. Inventory availability is 25,400 pieces.

Q8: What inventory levels support long-term production continuity?

A: Current inventory levels for active substitutes are: TS272IDT (21,553 pieces), TS272CDT (17,007 pieces), TS272ACDT (25,400 pieces), TL072CDT (203,200 pieces), TS27L2BIDT (10,353 pieces), and TS27L2ACDT (10,400 pieces). These quantities support sustained production requirements. The LM432MA/NOPB direct equivalent has 869 pieces available. For applications requiring obsolete LM432MA devices, transitioning to active substitutes ensures long-term supply chain stability and eliminates future availability risk.

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