OPA691IDRG4 Equivalent & Substitute Parts

Part Overview

The OPA691IDRG4 is a current feedback amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as a linear amplifier integrated circuit designed for high-speed signal processing applications. The OPA691IDRG4 is currently discontinued at DiGi Electronics, necessitating identification of equivalent substitute components for ongoing design support and procurement requirements. Substitute parts must maintain electrical compatibility across critical performance parameters including slew rate, gain bandwidth product, supply voltage range, and output current specifications.

Substiute Parts

OPA691IDRG4

Texas InstrumentsIn Stock: 774OPA691IDRG4 Datasheet

Current PartRFQ

OPA691IDR

Texas InstrumentsIn Stock: 8425OPA691IDR Datasheet

MFR RecommendedRFQ

EL5160ISZ

Renesas Electronics CorporationIn Stock: 2239EL5160ISZ Datasheet

MFR RecommendedRFQ

EL5160ISZ-T7A

Renesas Electronics CorporationIn Stock: 1031EL5160ISZ-T7A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPA691IDRG4 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

• Amplifier type must be current feedback
• Single circuit configuration (1 circuit)
• Package type must be 8-SOIC surface mount
• Operating temperature range must encompass -40°C to 85°C
• Supply voltage span must support 5V to 12V operation
• Output current capability must meet or exceed 190 mA per channel

Performance Parameter Alignment: Substitute parts must maintain slew rate, gain bandwidth product, and -3dB bandwidth specifications within acceptable operational margins. Input bias current, input offset voltage, and supply current specifications determine functional equivalence in signal conditioning applications.

Compliance & Status Considerations: All substitute parts must maintain ROHS3 compliance and REACH unaffected status. Product status (active, discontinued, or obsolete) affects long-term availability and procurement strategy.

The OPA691IDR qualifies as a direct manufacturer-recommended substitute due to identical electrical specifications and active product status. The EL5160ISZ and EL5160ISZ-T7A variants present performance trade-offs requiring engineering evaluation based on application-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: OPA691IDR

The OPA691IDR is the manufacturer-recommended substitute for the OPA691IDRG4. This part maintains identical electrical specifications across all critical parameters: 2100 V/µs slew rate, 2 GHz gain bandwidth product, 280 MHz -3dB bandwidth, 190 mA output current, and 5V to 12V supply voltage range. The OPA691IDR is currently in active product status with 8406 units in stock, ensuring long-term availability. Both parts are ROHS3 compliant and REACH unaffected. The primary distinction is packaging: OPA691IDR is supplied in Tape & Reel format versus the OPA691IDRG4 tube packaging. This substitution requires no circuit redesign or performance re-evaluation.

Secondary Substitutes: EL5160ISZ and EL5160ISZ-T7A

The EL5160ISZ and EL5160ISZ-T7A are Renesas Electronics current feedback amplifiers in 8-SOIC packages with obsolete product status. These parts present measurable performance trade-offs:

• Slew rate reduced to 1700 V/µs (19% lower than OPA691IDRG4)
• -3dB bandwidth reduced to 200 MHz (29% lower than OPA691IDRG4)
• Input offset voltage increased to 1.6 mV (3.2× higher than OPA691IDRG4)
• Supply current reduced to 0.75–0.8 mA (85% lower than OPA691IDRG4)
• Maximum supply voltage limited to 10V (versus 12V for OPA691IDRG4)
• Output current capability reduced to 140 mA (EL5160ISZ) or 70 mA (EL5160ISZ-T7A)

These substitutes are suitable only for applications where reduced bandwidth and slew rate are acceptable, and where output current requirements do not exceed 140 mA. The EL5160ISZ-T7A is particularly constrained by 70 mA output current, limiting its use to low-current signal conditioning applications. Both Renesas parts offer superior moisture sensitivity (MSL 1 vs. MSL 2) and lower supply current consumption.

Compliance Status:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the OPA691IDR directly replace the OPA691IDRG4 without circuit modification?

A: Yes. The OPA691IDR is electrically identical to the OPA691IDRG4 across all specified parameters. The only difference is packaging format (Tape & Reel versus tube). No circuit redesign, PCB layout changes, or performance re-evaluation are required. Both parts are pin-compatible 8-SOIC surface mount devices with identical electrical characteristics.

Q: What are the key performance differences between OPA691IDRG4 and EL5160ISZ?

A: The EL5160ISZ exhibits lower performance specifications: 1700 V/µs slew rate (versus 2100 V/µs), 200 MHz bandwidth (versus 280 MHz), and 1.6 mV input offset voltage (versus 500 µV). Output current is limited to 140 mA (versus 190 mA). Maximum supply voltage is 10V instead of 12V. These differences make the EL5160ISZ unsuitable for high-speed, high-current applications requiring the OPA691IDRG4's performance envelope.

Q: Is the EL5160ISZ-T7A suitable as a substitute for high-current applications?

A: No. The EL5160ISZ-T7A is constrained to 70 mA maximum output current per channel, making it unsuitable for applications requiring 190 mA output current. This part is limited to low-current signal conditioning and buffering applications only.

Q: What is the significance of product status (Active, Discontinued, Obsolete)?

A: Product status indicates availability and long-term support. OPA691IDR (Active) ensures continued manufacturing and procurement availability. OPA691IDRG4 (Discontinued) and EL5160ISZ/EL5160ISZ-T7A (Obsolete) indicate limited remaining inventory with no future production. For new designs, OPA691IDR is the recommended choice due to active status.

Q: Are all substitute parts pin-compatible with the OPA691IDRG4?

A: Yes. All substitute parts are housed in 8-SOIC surface mount packages with identical pinout and footprint (0.154" width, 3.90mm). PCB layout and footprint files require no modification for any of these substitutes.

Q: What is the difference between MSL 2 (1 Year) and MSL 1 (Unlimited)?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture absorption during storage. MSL 2 (1 Year) requires reflow within one year of opening the package. MSL 1 (Unlimited) has no time restriction. The EL5160ISZ and EL5160ISZ-T7A offer superior moisture tolerance, beneficial for long-term inventory management.

Q: Can the OPA691IDRG4 operate at 12V supply with EL5160ISZ substitutes?

A: No. The EL5160ISZ and EL5160ISZ-T7A are rated for maximum 10V supply voltage. Circuits designed for 12V operation cannot use these Renesas substitutes without supply voltage reduction, which may compromise performance.

Q: Which substitute is recommended for new design implementations?

A: The OPA691IDR is the only recommended substitute for new designs. It maintains full electrical equivalence with active product status, ensuring long-term availability and design stability. The Renesas EL5160 variants are suitable only for legacy design support where performance trade-offs are acceptable.