CA3140AM96 Equivalent & Substitute Parts

Part Overview

The CA3140AM96 is a general-purpose operational amplifier manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device is classified as obsolete, with limited inventory availability of 829 pieces. The CA3140AM96 operates across a wide supply voltage range of 4V to 36V and is suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, procurement reliability, and long-term product support. Active alternatives with comparable electrical characteristics and identical packaging are available from multiple manufacturers.

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 CA3140AM96 is determined by the following critical parameters: amplifier type, number of circuits, package type, supply voltage range, and operating temperature range. The CA3140AM96 is a general-purpose amplifier with a single circuit in an 8-SOIC package, operating from 4V to 36V across an extended temperature range of -55°C to 125°C.

Substitute parts are grouped into two categories:

Category 1: Direct Functional Equivalent (Same Amplifier Type) The CA3140AMZ96 is a direct equivalent from the same manufacturer (Renesas Electronics Corporation) with identical electrical specifications, package type, and supply voltage range. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). The operating temperature range differs slightly (-50°C to 125°C versus -55°C to 125°C).

Category 2: Functional Alternatives (Different Amplifier Type) The LT1793 series (Analog Devices Inc.) and OPA131 series (Texas Instruments) are J-FET amplifiers with comparable gain-bandwidth products and slew rates. These devices operate in the same 8-SOIC package and support the required supply voltage range. However, they feature different amplifier topologies (J-FET versus general-purpose), which may affect input bias current, input offset voltage, and operating temperature specifications.

The INA149AMDREP (Texas Instruments) is a differential amplifier with different electrical characteristics, including lower slew rate (5V/µs) and higher input offset voltage (350µV), making it suitable only for applications where differential amplification is required.

The TL071ACDT (STMicroelectronics) is a J-FET amplifier with higher slew rate (16V/µs) and comparable gain-bandwidth product, suitable for applications requiring faster signal response.

Parameter Comparison

Parameter	CA3140AM96	CA3140AMZ96	LT1793CS8#PBF	LT1793IS8#PBF	OPA131UA/2K5	TL071ACDT	INA149AMDREP
Manufacturer	Renesas	Renesas	Analog Devices	Analog Devices	Texas Instruments	STMicroelectronics	Texas Instruments
Amplifier Type	General Purpose	General Purpose	J-FET	J-FET	General Purpose	J-FET	Differential
Number of Circuits	1	1	1	1	1	1	1
Slew Rate (V/µs)	9	9	3.4	3.4	10	16	5
Gain Bandwidth Product (MHz)	4.5	4.5	4.2	4.2	4	4	0.5
Current - Input Bias (pA)	10	10	4	4	5	20	—
Voltage - Input Offset (mV)	2	2	0.25	0.25	0.2	3	0.35
Current - Supply (mA)	4	4	4.2	4.2	1.5	1.4	0.81
Current - Output / Channel (mA)	40	40	—	—	25	40	25
Voltage - Supply Span (Min)	4	4	9	9	9	6	4
Voltage - Supply Span (Max)	36	36	40	40	36	36	36
Operating Temperature (°C)	-55 to 125	-50 to 125	0 to 70	-40 to 85	-40 to 85	0 to 70	-55 to 125
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: CA3140AMZ96

The CA3140AMZ96 is the preferred direct substitute for the CA3140AM96. Both devices are manufactured by Renesas Electronics Corporation and share identical electrical specifications, including slew rate (9V/µs), gain-bandwidth product (4.5MHz), input bias current (10pA), and output current capability (40mA). The CA3140AMZ96 is currently in active production status with significantly higher inventory availability (55,400 pieces) compared to the obsolete CA3140AM96 (829 pieces). The CA3140AMZ96 is ROHS3 compliant, addressing regulatory requirements for new designs. The operating temperature range of the CA3140AMZ96 (-50°C to 125°C) covers the majority of industrial and commercial applications, with a 5°C reduction at the lower temperature limit compared to the original part.

Secondary Recommendations: LT1793 Series (Analog Devices Inc.)

The LT1793IS8#PBF and LT1793IS8#TRPBF are J-FET amplifiers suitable for applications where lower input bias current (4pA) and lower input offset voltage (250µV) are beneficial. These devices operate across the -40°C to 85°C temperature range and are ROHS3 compliant. The LT1793 series exhibits lower slew rate (3.4V/µs) compared to the CA3140AM96, which may limit performance in high-speed signal conditioning applications. The minimum supply voltage requirement of 9V for the LT1793 series restricts use in applications requiring operation below 9V.

The LT1793CS8#PBF and LT1793CS8#TRPBF variants operate across the 0°C to 70°C temperature range, suitable for commercial-grade applications with narrower temperature requirements.

Tertiary Recommendations: OPA131 Series (Texas Instruments)

The OPA131UA/2K5 and OPA131UJ/2K5 are general-purpose and J-FET amplifiers respectively, with higher slew rate (10V/µs) and lower supply current (1.5mA) compared to the CA3140AM96. These devices are ROHS3 compliant and operate across the -40°C to 85°C temperature range. The minimum supply voltage requirement of 9V restricts use in low-voltage applications. The OPA131 series is suitable for power-sensitive applications where reduced supply current is advantageous.

Alternative Recommendation: TL071ACDT (STMicroelectronics)

The TL071ACDT is a J-FET amplifier with the highest slew rate (16V/µs) among the available substitutes, suitable for applications requiring fast signal response. This device is ROHS3 compliant and operates across the 0°C to 70°C temperature range. The minimum supply voltage of 6V and higher input bias current (20pA) compared to the CA3140AM96 should be evaluated against specific application requirements.

Not Recommended: INA149AMDREP (Texas Instruments)

The INA149AMDREP is a differential amplifier with fundamentally different circuit topology and electrical characteristics. The significantly lower gain-bandwidth product (0.5MHz) and higher input offset voltage (350µV) make this device unsuitable as a general-purpose substitute for the CA3140AM96. This device is appropriate only for applications specifically requiring differential amplification.

Frequently Asked Questions (FAQ)

Q: Can the CA3140AMZ96 be used as a direct replacement for the CA3140AM96 in all applications?

A: The CA3140AMZ96 is electrically equivalent to the CA3140AM96 with identical slew rate, gain-bandwidth product, input bias current, and output current specifications. The operating temperature range differs by 5°C at the lower limit (-50°C versus -55°C). For applications operating above -50°C, the CA3140AMZ96 is a direct replacement. For applications requiring operation below -50°C, the original CA3140AM96 specifications must be verified against system requirements.

Q: What is the primary difference between general-purpose and J-FET amplifier topologies?

A: General-purpose amplifiers (CA3140 series) and J-FET amplifiers (LT1793, OPA131, TL071 series) differ in input stage design. J-FET amplifiers feature lower input bias current and lower input offset voltage, making them suitable for high-impedance signal sources and precision measurement applications. General-purpose amplifiers typically offer higher slew rate and output current capability. Selection depends on specific application requirements for input impedance, offset voltage, and signal bandwidth.

Q: Why do some substitute parts have a minimum supply voltage of 9V instead of 4V?

A: The LT1793 and OPA131 series are designed with internal circuit topologies requiring minimum supply voltages of 9V for proper operation. The CA3140AM96 and CA3140AMZ96 are designed to operate from lower supply voltages (4V minimum). Applications requiring operation below 9V must use the CA3140AMZ96 or other parts with lower minimum supply voltage specifications.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed (CA3140AMZ96, LT1793 series, OPA131 series, TL071ACDT, INA149AMDREP) are ROHS3 compliant. The original CA3140AM96 is RoHS non-compliant. For new designs subject to RoHS regulations, the CA3140AMZ96 or other compliant alternatives must be selected.

Q: What is the significance of operating temperature range differences?

A: Operating temperature range defines the environmental conditions under which the device functions within specified electrical parameters. The CA3140AM96 operates from -55°C to 125°C (extended industrial range), while most substitutes operate from -40°C to 85°C (industrial range) or 0°C to 70°C (commercial range). Applications requiring extended temperature operation below -40°C must verify substitute part compatibility or select the CA3140AMZ96, which maintains the -50°C lower limit.

Q: Can the INA149AMDREP be used in place of the CA3140AM96?

A: The INA149AMDREP is a differential amplifier with different circuit topology and significantly different electrical characteristics. It is not suitable as a general-purpose substitute for the CA3140AM96. This device is appropriate only for applications specifically requiring differential amplification of two input signals.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in 8-SOIC surface mount packages, maintaining mechanical compatibility with the CA3140AM96. Packaging variants include Cut Tape (CT), Digi-Reel®, Tube, and Tape & Reel (TR) options. Selection of packaging variant depends on procurement volume and assembly process requirements.

Q: How does slew rate affect circuit performance?

A: Slew rate defines the maximum rate of change of output voltage per unit time (V/µs). Higher slew rate enables faster signal response and reduced distortion in high-frequency applications. The CA3140AM96 has a slew rate of 9V/µs. Substitutes range from 3.4V/µs (LT1793 series) to 16V/µs (TL071ACDT). Applications with high-frequency signals or fast transient response requirements should select substitutes with equal or higher slew rate.

Q: What is the importance of gain-bandwidth product in amplifier selection?

A: Gain-bandwidth product (GBW) defines the product of closed-loop gain and bandwidth, representing the frequency response capability of the amplifier. The CA3140AM96 has a GBW of 4.5MHz. Most substitutes have comparable GBW (4.0 to 4.2MHz), ensuring similar frequency response characteristics. The INA149AMDREP has significantly lower GBW (0.5MHz), limiting its use to low-frequency applications.

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