OPA843IDR Equivalent & Substitute Parts

Part Overview

The OPA843IDR 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 wide bandwidth and fast slew rate performance. The device is currently in active production status with ROHS3 compliance and is suitable for applications demanding voltage feedback amplification in the -40°C to 85°C operating temperature range. Substitute parts are identified based on functional equivalence within the voltage feedback amplifier category, maintaining compatibility with the 8-SOIC package footprint and electrical operating parameters.

Substiute Parts

OPA843IDR

Texas InstrumentsIn Stock: 17110OPA843IDR Datasheet

Current PartRFQ

AD9631ARZ

Analog Devices Inc.In Stock: 5008AD9631ARZ Datasheet

MFR RecommendedRFQ

AD9631ARZ-REEL7

Analog Devices Inc.In Stock: 18346AD9631ARZ-REEL7 Datasheet

MFR RecommendedRFQ

AD9632ARZ

Analog Devices Inc.In Stock: 3282AD9632ARZ Datasheet

MFR RecommendedRFQ

AD9632ARZ-REEL7

Analog Devices Inc.In Stock: 17139AD9632ARZ-REEL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPA843IDR are identified as voltage feedback amplifiers in the 8-SOIC package with active product status and ROHS3 compliance. The substitution logic is based on the following criteria:

Primary Compatibility Criteria:

• 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
• RoHS Status: ROHS3 Compliant
• Product Status: Active

Electrical Parameter Ranges for Substitution:

• Slew Rate: 1000 V/µs or greater
• -3dB Bandwidth: 250 MHz or greater
• Current - Input Bias: 20 µA or less
• Voltage - Input Offset: 300 µV or less
• Current - Supply: 20.2 mA or less
• Current - Output / Channel: 100 mA or greater
• Voltage - Supply Span (Min): 6 V to 8 V
• Voltage - Supply Span (Max): 12 V

The substitute parts identified are manufactured by Analog Devices Inc. and are available in both standard tube packaging and cut tape with Digi-Reel® configurations. All substitutes maintain the same package footprint and thermal operating range as the primary part.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, meeting the regulatory and supply chain requirements equivalent to the OPA843IDR. The substitutes are manufactured by Analog Devices Inc., a qualified source for linear amplifier integrated circuits.

Packaging Considerations:

The OPA843IDR is supplied in Tape & Reel (TR) format. Substitute parts are available in two packaging configurations:

• Tube Packaging: AD9631ARZ and AD9632ARZ are supplied in standard tube format, suitable for lower-volume applications and manual assembly processes.

• Cut Tape with Digi-Reel® Format: AD9631ARZ-REEL7 and AD9632ARZ-REEL7 are supplied in cut tape with Digi-Reel® configuration, providing compatibility with automated pick-and-place equipment and high-volume manufacturing environments.

Electrical Performance Trade-offs:

The AD9631ARZ and AD9631ARZ-REEL7 variants offer higher slew rate (1300 V/µs) and greater -3dB bandwidth (320 MHz) compared to the OPA843IDR, with reduced input bias current (2 µA) and lower supply current (17 mA).

The AD9632ARZ and AD9632ARZ-REEL7 variants provide the highest slew rate (1500 V/µs) among the substitutes, with the lowest input offset voltage (2 mV) and supply current (16 mA), though with reduced -3dB bandwidth (250 MHz).

Moisture Sensitivity:

All Analog Devices substitutes feature MSL 1 (Unlimited) rating, providing superior moisture tolerance compared to the OPA843IDR MSL 2 (1 Year) rating. This results in extended shelf life and reduced risk of moisture-induced failures during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can AD9631ARZ or AD9632ARZ be used as direct replacements for OPA843IDR in existing designs?

A: Yes, both parts are functionally equivalent within the voltage feedback amplifier category and share the identical 8-SOIC package footprint. Pin-to-pin compatibility is maintained across all substitute parts. However, the electrical performance characteristics differ, particularly in slew rate, bandwidth, and input bias current. Circuit performance should be evaluated based on application-specific requirements.

Q: What is the difference between AD9631ARZ-REEL7 and AD9631ARZ?

A: Both parts are electrically identical with the same electrical specifications. The primary difference is packaging format. AD9631ARZ is supplied in tube packaging, while AD9631ARZ-REEL7 is supplied in cut tape with Digi-Reel® format. The REEL7 designation indicates compatibility with automated tape-feeding equipment used in high-volume manufacturing.

Q: Are the substitute parts compatible with the same PCB layout as the OPA843IDR?

A: Yes. All substitute parts use the 8-SOIC package with 0.154" (3.90mm) width, maintaining identical pin spacing and footprint dimensions. PCB layouts designed for the OPA843IDR require no modification for physical placement of substitute parts.

Q: What are the key electrical differences between AD9631ARZ and AD9632ARZ?

A: The AD9632ARZ provides higher slew rate (1500 V/µs versus 1300 V/µs), lower input offset voltage (2 mV versus 3 mV), and lower supply current (16 mA versus 17 mA). The AD9631ARZ offers higher -3dB bandwidth (320 MHz versus 250 MHz). Selection depends on whether bandwidth or slew rate performance is prioritized in the application.

Q: Do all substitute parts meet the same temperature operating range as the OPA843IDR?

A: Yes. All substitute parts operate across the -40°C to 85°C temperature range, matching the OPA843IDR specification.

Q: What is the significance of the MSL rating difference?

A: The OPA843IDR has MSL 2 (1 Year) rating, requiring reflow within one year of moisture exposure. All Analog Devices substitutes have MSL 1 (Unlimited) rating, eliminating time-based moisture sensitivity constraints. This provides extended shelf life and reduced risk of moisture-induced solder joint failures.

Q: Are the substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts are ROHS3 compliant, meeting the same environmental and regulatory requirements as the OPA843IDR.

Q: Which substitute part should be selected for maximum output current capability?

A: The OPA843IDR provides 100 mA output current per channel. All Analog Devices substitutes provide 70 mA output current per channel. If 100 mA output current is required, the OPA843IDR must be retained. If 70 mA output current is sufficient for the application, any substitute part is acceptable.