CA3140AM Equivalent & Substitute Parts

Part Overview

The CA3140AM is a general-purpose operational amplifier manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device is classified as obsolete, though 2120 units remain in stock as new original inventory. The CA3140AM operates across a wide supply voltage range of 4V to 36V and is rated for industrial temperature applications from -55°C to 125°C. Due to its obsolete status, equivalent and substitute parts are necessary for new designs, long-term production continuity, and system upgrades where active component alternatives are preferred.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	9	V/µs
Gain Bandwidth Product	4.5	MHz
Current - Input Bias	10	pA
Voltage - Input Offset	2	mV
Current - Supply	4	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	4	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-55 to 125	°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 CA3140AM is determined by compatibility across the following critical parameters: package type (8-SOIC surface mount), supply voltage range (minimum 4V, maximum 36V), number of circuits (single channel), and operating temperature range. The CA3140AM operates across -55°C to 125°C, establishing the baseline for industrial-grade applications.

Substitute parts are grouped into two categories:

Direct Equivalent (Identical Specifications): The CA3140AMZ from Renesas Electronics Corporation maintains identical electrical specifications and package configuration. This part differs only in product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Functional Alternatives (Different Amplifier Topologies): Parts including the LT1793 series (J-FET topology), INA149AMDREP (differential topology), OPA131 series (general purpose), and TL071ACDT (J-FET topology) provide operational amplification in the same 8-SOIC package with overlapping supply voltage ranges. These alternatives differ in amplifier type, input bias current, slew rate, and operating temperature specifications. Selection among functional alternatives requires verification that the specific amplifier topology and electrical characteristics align with circuit requirements.

Parameter Comparison

Parameter	CA3140AM	CA3140AMZ	LT1793CS8#PBF	LT1793IS8#PBF	INA149AMDREP	OPA131UA/2K5	TL071ACDT
Amplifier Type	General Purpose	General Purpose	J-FET	J-FET	Differential	General Purpose	J-FET
Number of Circuits	1	1	1	1	1	1	1
Slew Rate (V/µs)	9	9	3.4	3.4	5	10	16
Gain Bandwidth Product (MHz)	4.5	4.5	4.2	4.2	—	4	4
Current - Input Bias (pA)	10	10	4	4	—	5	20
Voltage - Input Offset (mV)	2	2	0.25	0.25	0.35	0.2	3
Current - Supply (mA)	4	4	4.2	4.2	0.81	1.5	1.4
Current - Output / Channel (mA)	40	40	—	—	25	25	40
Voltage - Supply Span Min (V)	4	4	9	9	4	9	6
Voltage - Supply Span Max (V)	36	36	40	40	36	36	36
Operating Temperature Min (°C)	-55	-55	0	-40	-55	-40	0
Operating Temperature Max (°C)	125	125	70	85	125	85	70
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

CA3140AMZ is the primary direct equivalent for the CA3140AM. Both parts maintain identical electrical specifications, package configuration, and supply voltage range. The CA3140AMZ is classified as active product status with ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the original CA3140AM. This part is recommended for direct replacement in new designs and production continuity.

LT1793IS8#PBF and LT1793IS8#TRPBF are J-FET topology alternatives from Analog Devices Inc. These parts operate across -40°C to 85°C, which does not cover the full -55°C to 125°C range of the CA3140AM. The LT1793 series exhibits lower input bias current (4 pA versus 10 pA) and lower input offset voltage (250 µV versus 2 mV), with reduced slew rate (3.4 V/µs versus 9 V/µs). Minimum supply voltage is 9V, exceeding the CA3140AM minimum of 4V. These parts are suitable for applications where the narrower temperature range and higher minimum supply voltage are acceptable and where lower input bias current is beneficial.

INA149AMDREP is a differential amplifier topology from Texas Instruments. This part operates across the full -55°C to 125°C temperature range and maintains the 4V to 36V supply voltage range. However, it exhibits significantly different electrical characteristics: lower slew rate (5 V/µs), reduced output current capability (25 mA versus 40 mA), and substantially higher supply current (810 µA versus 4 mA). This part is applicable only when differential amplification topology is required.

OPA131UA/2K5 and OPA131UJ/2K5 are general-purpose amplifiers from Texas Instruments. These parts operate across -40°C to 85°C with a minimum supply voltage of 9V. They provide higher slew rate (10 V/µs) and lower supply current (1.5 mA) compared to the CA3140AM. These parts are suitable for applications where the narrower temperature range and higher minimum supply voltage are acceptable and where reduced power consumption is advantageous.

TL071ACDT is a J-FET amplifier from STMicroelectronics. This part operates across 0°C to 70°C with a minimum supply voltage of 6V. It provides the highest slew rate (16 V/µs) among the alternatives and maintains 40 mA output current capability. The operating temperature range does not extend to -55°C or above 70°C. This part is suitable for applications where the narrower temperature range is acceptable and where higher slew rate performance is required.

All substitute parts maintain the 8-SOIC surface mount package and are ROHS3 compliant, addressing regulatory requirements of the obsolete CA3140AM.

Frequently Asked Questions (FAQ)

Q: Can the CA3140AMZ be used as a direct replacement for the CA3140AM?

A: Yes. The CA3140AMZ maintains identical electrical specifications, package configuration, and supply voltage range as the CA3140AM. The primary differences are product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). The CA3140AMZ is the recommended direct replacement.

Q: What is the primary limitation when substituting the LT1793 series for the CA3140AM?

A: The LT1793 series operates across 0°C to 70°C (LT1793CS8#PBF) or -40°C to 85°C (LT1793IS8#PBF and LT1793IS8#TRPBF), which does not cover the full -55°C to 125°C industrial temperature range of the CA3140AM. Additionally, the minimum supply voltage is 9V, compared to 4V for the CA3140AM. These parts are suitable only for applications where the narrower temperature and supply voltage ranges are acceptable.

Q: Why does the INA149AMDREP have different electrical characteristics?

A: The INA149AMDREP is a differential amplifier topology, whereas the CA3140AM is a general-purpose amplifier. Differential amplifiers are designed for specific signal conditioning applications and inherently exhibit different input bias current, slew rate, output current, and supply current characteristics. This part is applicable only when differential amplification is required.

Q: What are the packaging options available for substitute parts?

A: All substitute parts are available in 8-SOIC surface mount package, maintaining mechanical compatibility with the CA3140AM. Packaging variants differ in delivery format: tube packaging, cut tape with digi-reel, and tape & reel. These variants do not affect electrical performance or board-level compatibility.

Q: Which substitute part provides the lowest power consumption?

A: The OPA131UA/2K5 and OPA131UJ/2K5 provide the lowest supply current at 1.5 mA, compared to 4 mA for the CA3140AM. However, these parts operate across -40°C to 85°C and require a minimum supply voltage of 9V.

Q: Can the TL071ACDT be used in applications requiring -55°C operation?

A: No. The TL071ACDT operates across 0°C to 70°C, which does not include -55°C. This part is unsuitable for applications requiring the full industrial temperature range of the CA3140AM.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance of the obsolete CA3140AM. This compliance is necessary for applications subject to RoHS regulations.

Q: What is the key difference between the LT1793CS8#PBF and LT1793IS8#PBF?

A: Both parts are J-FET amplifiers with identical electrical specifications. The primary difference is operating temperature range: LT1793CS8#PBF operates across 0°C to 70°C, while LT1793IS8#PBF operates across -40°C to 85°C. The LT1793IS8#PBF provides extended low-temperature operation.

Q: Which substitute part maintains the full -55°C to 125°C operating temperature range?

A: The CA3140AMZ is the only substitute part that maintains the full -55°C to 125°C operating temperature range of the CA3140AM. All other alternatives have narrower temperature specifications.

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