OPA842ID Equivalent & Substitute Parts

Part Overview

The OPA842ID is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This single-circuit operational amplifier is designed for high-speed signal conditioning applications requiring moderate bandwidth and slew rate performance. The device is currently in active production status with 1430 units available in new original inventory.

Substitute parts become necessary when the OPA842ID reaches end-of-life status, when supply constraints occur, or when design requirements permit operation with enhanced electrical characteristics. The Analog Devices AD9631 and AD9632 series provide direct functional alternatives within the same package footprint and pin configuration.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-40°C to 85°C	—
Voltage Supply Span	10 V to 12 V	V
Slew Rate	400	V/µs
Gain Bandwidth Product	200	MHz
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	2 (1 Year)	—

Substitute Part Grouping Explanation

Substitution eligibility for the OPA842ID is determined by the following criteria:

Mandatory Compatibility Requirements:

Amplifier Type: Voltage Feedback
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 85°C minimum
Voltage Supply Span: Minimum 10 V to 12 V compatibility
Product Status: Active

Electrical Performance Parameters:

Slew Rate: 400 V/µs or greater
Gain Bandwidth Product: 200 MHz or greater
Current - Supply: 20.2 mA or less
Current - Output / Channel: 100 mA or greater

All four substitute parts (AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7) meet these mandatory requirements. The AD9631 and AD9632 base products differ in slew rate and bandwidth specifications, with both exceeding the OPA842ID performance envelope. Packaging variants (Tube versus Cut Tape & Digi-Reel) do not affect electrical compatibility.

Parameter Comparison

Parameter	OPA842ID	AD9631ARZ	AD9631ARZ-REEL7	AD9632ARZ	AD9632ARZ-REEL7
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	1	1	1	1	1
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Slew Rate (V/µs)	400	1300	1300	1500	1500
Bandwidth (MHz)	200	320	320	250	250
Current - Input Bias (µA)	20	2	2	2	2
Voltage - Input Offset (mV)	0.3	3	3	2	2
Current - Supply (mA)	20.2	17	17	16	16
Current - Output / Channel (mA)	100	70	70	70	70
Voltage - Supply Span (Min - Max)	10 V - 12 V	6 V - 12 V	6 V - 12 V	6 V - 12 V	6 V - 12 V
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes:

The AD9632ARZ and AD9632ARZ-REEL7 represent the preferred substitutes for the OPA842ID. Both variants of the AD9632 base product deliver superior slew rate performance (1500 V/µs versus 400 V/µs) and maintain active product status with ROHS3 compliance. The AD9632 series exhibits lower input bias current (2 µA versus 20 µA) and reduced supply current (16 mA versus 20.2 mA), resulting in improved circuit efficiency. Moisture sensitivity is upgraded to MSL 1 (Unlimited) compared to the OPA842ID MSL 2 (1 Year), providing enhanced reliability in storage and manufacturing environments.

Secondary Substitutes:

The AD9631ARZ and AD9631ARZ-REEL7 provide alternative substitution with comparable electrical performance. The AD9631 series achieves 1300 V/µs slew rate and 320 MHz bandwidth, exceeding OPA842ID specifications. Input bias current and supply current characteristics match the AD9632 series. Both AD9631 variants maintain active status and ROHS3 compliance with MSL 1 moisture sensitivity.

Packaging Considerations:

The Tube packaging variants (AD9632ARZ, AD9631ARZ) are suitable for lower-volume applications and manual assembly processes. The Cut Tape & Digi-Reel variants (AD9632ARZ-REEL7, AD9631ARZ-REEL7) accommodate automated pick-and-place assembly and higher-volume production environments. Electrical specifications remain identical between packaging formats.

Supply Voltage Compatibility:

The OPA842ID operates within a 10 V to 12 V supply span. All substitute parts support a broader 6 V to 12 V range, ensuring compatibility with the OPA842ID's specified operating voltage window and permitting operation at lower supply voltages if circuit design permits.

Frequently Asked Questions (FAQ)

Q: Can the AD9631 and AD9632 be used interchangeably with the OPA842ID?

A: Both the AD9631 and AD9632 series meet the mandatory compatibility requirements for the OPA842ID. The primary difference between these Analog Devices products is slew rate (1300 V/µs for AD9631 versus 1500 V/µs for AD9632) and bandwidth (320 MHz for AD9631 versus 250 MHz for AD9632). Selection between these two families depends on specific application requirements for transient response speed and frequency response characteristics.

Q: What is the difference between the Tube and Digi-Reel packaging options?

A: Tube packaging (AD9632ARZ, AD9631ARZ) presents components in a plastic tube suitable for manual handling and lower-volume assembly. Cut Tape & Digi-Reel packaging (AD9632ARZ-REEL7, AD9631ARZ-REEL7) provides components on continuous tape wound on a reel, optimized for automated assembly equipment. Electrical performance and pin configuration are identical between packaging formats.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The OPA842ID and all four substitute parts (AD9631ARZ, AD9631ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7) are ROHS3 compliant. All parts are also REACH unaffected and classified under ECCN EAR99.

Q: What is the significance of the Moisture Sensitivity Level difference?

A: The OPA842ID carries MSL 2 (1 Year), indicating a one-year shelf life limit under controlled moisture conditions. All substitute parts carry MSL 1 (Unlimited), providing indefinite shelf life under standard storage conditions. This represents an improvement in component reliability and reduces risk of moisture-induced failures during manufacturing and storage.

Q: Do the substitute parts fit the same PCB footprint as the OPA842ID?

A: Yes. All substitute parts use the 8-SOIC package with 0.154" (3.90mm) width, identical to the OPA842ID. PCB layout and footprint remain unchanged, enabling direct component substitution without circuit board redesign.

Q: What is the impact of lower input bias current in the substitute parts?

A: The substitute parts exhibit 2 µA input bias current compared to the OPA842ID's 20 µA. Lower input bias current reduces DC offset errors in high-impedance circuits and decreases power consumption in bias network resistors. This represents an improvement for precision analog applications.

Q: Can the OPA842ID be replaced in existing designs without circuit modification?

A: Direct substitution is possible from an electrical and mechanical standpoint. However, the enhanced performance characteristics of the substitute parts (higher slew rate, lower input bias current, improved bandwidth) may require circuit validation to ensure the design operates within intended specifications. No PCB modifications are required.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message