OPA861IDRG4 Equivalent & Substitute Parts

Part Overview

The OPA861IDRG4 is a transconductance amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement requirements. The OPA861IDRG4 delivers a transconductance amplifier topology with a single circuit configuration, slew rate of 900V/µs, and gain bandwidth product of 80 MHz, operating across a supply voltage range of 4V to 12.6V.

Substiute Parts

OPA861IDRG4

Texas InstrumentsIn Stock: 1107OPA861IDRG4 Datasheet

Current PartRFQ

AD9631ARZ-REEL

Analog Devices Inc.In Stock: 2876AD9631ARZ-REEL Datasheet

MFR RecommendedRFQ

OPA861ID

Texas InstrumentsIn Stock: 1211OPA861ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPA861IDRG4 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mechanical Compatibility:

• Package type: 8-SOIC surface mount configuration
• Package dimensions: 0.154" width (3.90mm)
• Mounting type: Surface mount

Electrical Compatibility:

• Number of circuits: 1 circuit per device
• Operating temperature range: -40°C to 85°C
• Supply voltage span: Minimum 4V to maximum 12.6V
• Input offset voltage: 3 mV
• Input bias current: 1 µA or lower

Compliance Requirements:

• RoHS3 compliance
• REACH unaffected status
• ECCN: EAR99 classification

The OPA861IDRG4 operates as a transconductance amplifier. Substitute parts must maintain compatibility with these core parameters while accommodating the obsolete status of the original component.

Parameter Comparison

Engineering Selection Recommendations

OPA861ID (Texas Instruments)

The OPA861ID is the primary substitute for the OPA861IDRG4. Both devices share identical electrical specifications: transconductance amplifier topology, 900V/µs slew rate, 80 MHz gain bandwidth product, 1 µA input bias current, 3 mV input offset voltage, and 5.4 mA supply current. The supply voltage range (4V to 12.6V) and operating temperature range (-40°C to 85°C) are identical. Both are housed in 8-SOIC surface mount packages with matching dimensions. The OPA861ID is currently in active product status with 1115 pieces in stock inventory. The primary difference is packaging: OPA861ID is supplied in tube format, while OPA861IDRG4 was supplied in tape and reel. Both devices maintain ROHS3 compliance and identical moisture sensitivity levels (MSL 2, 1 Year). This substitute provides direct functional and mechanical compatibility.

AD9631ARZ-REEL (Analog Devices Inc.)

The AD9631ARZ-REEL is an alternative substitute with different amplifier topology. This device is a voltage feedback amplifier rather than transconductance, resulting in different electrical characteristics. The AD9631ARZ-REEL exhibits higher slew rate (1300V/µs versus 900V/µs) and higher gain bandwidth product (320 MHz versus 80 MHz). Supply current is significantly higher at 17 mA compared to 5.4 mA. The minimum supply voltage requirement is 6V versus 4V for the OPA861IDRG4. Input offset voltage and operating temperature range remain compatible at 3 mV and -40°C to 85°C respectively. The AD9631ARZ-REEL is supplied in tape and reel packaging, matching the original OPA861IDRG4 format. This device is currently in active product status with 2801 pieces in stock. The AD9631ARZ-REEL is suitable only for applications where the higher performance characteristics and increased power consumption are acceptable, and where the minimum 6V supply voltage requirement can be met.

Frequently Asked Questions (FAQ)

Q: Can OPA861ID directly replace OPA861IDRG4 in existing designs?

A: Yes. The OPA861ID provides direct electrical and mechanical substitution. Both devices are transconductance amplifiers with identical slew rate (900V/µs), gain bandwidth product (80 MHz), input bias current (1 µA), input offset voltage (3 mV), supply current (5.4 mA), and supply voltage range (4V to 12.6V). The 8-SOIC package dimensions are identical. The primary difference is packaging format: OPA861ID uses tube packaging while OPA861IDRG4 used tape and reel. Both maintain ROHS3 compliance and identical moisture sensitivity levels.

Q: What are the key differences between OPA861IDRG4 and AD9631ARZ-REEL?

A: The devices differ in amplifier topology and performance characteristics. OPA861IDRG4 is a transconductance amplifier; AD9631ARZ-REEL is a voltage feedback amplifier. AD9631ARZ-REEL has higher slew rate (1300V/µs versus 900V/µs) and higher gain bandwidth product (320 MHz versus 80 MHz). AD9631ARZ-REEL requires higher supply current (17 mA versus 5.4 mA) and higher minimum supply voltage (6V versus 4V). Both share identical input offset voltage (3 mV) and operating temperature range (-40°C to 85°C). Both use 8-SOIC surface mount packages.

Q: Is the AD9631ARZ-REEL suitable for low-power applications?

A: No. The AD9631ARZ-REEL draws 17 mA supply current compared to 5.4 mA for the OPA861IDRG4, making it unsuitable for power-constrained designs. Additionally, the AD9631ARZ-REEL requires a minimum supply voltage of 6V, whereas the OPA861IDRG4 operates from 4V minimum. For low-power applications, the OPA861ID is the appropriate substitute.

Q: Are both substitute parts RoHS3 compliant?

A: Yes. Both OPA861ID and AD9631ARZ-REEL are ROHS3 compliant, matching the compliance status of the original OPA861IDRG4. Both are also REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the moisture sensitivity difference between the substitutes?

A: OPA861ID maintains the same moisture sensitivity level as OPA861IDRG4 (MSL 2, 1 Year). AD9631ARZ-REEL has improved moisture sensitivity (MSL 1, Unlimited), providing better protection against moisture absorption during storage and handling.

Q: Can these parts be used interchangeably in PCB designs?

A: OPA861ID can be used interchangeably with OPA861IDRG4 due to identical pin configuration and 8-SOIC package dimensions. AD9631ARZ-REEL shares the same 8-SOIC package footprint but has different electrical characteristics and may require circuit design modifications to accommodate higher slew rate, higher bandwidth, increased supply current, and higher minimum supply voltage requirements.