OPA843IDG4 Equivalent & Substitute Parts

Part Overview

The OPA843IDG4 is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The OPA843IDG4 delivers high-speed amplification with a gain bandwidth product of 800 MHz and slew rate of 1000V/µs, suitable for applications requiring wideband signal conditioning and high-frequency amplification.

Key Parameters

Parameter	Value
Amplifier Type	Voltage Feedback
Number of Circuits	1
Slew Rate	1000V/µs
Gain Bandwidth Product	800 MHz
-3dB Bandwidth	500 MHz
Current - Input Bias	20 µA
Voltage - Input Offset	300 µV
Current - Supply	20.2 mA
Current - Output / Channel	100 mA
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	12 V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution of the OPA843IDG4 is determined by strict electrical and mechanical compatibility within the voltage feedback amplifier category. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback (required match)
Number of Circuits: 1 (required match)
Package / Case: 8-SOIC (required match)
Mounting Type: Surface Mount (required match)
Operating Temperature Range: -40°C ~ 85°C (required match)

Secondary Electrical Parameters for Compatibility Assessment:

Slew Rate: 1000V/µs (OPA843IDG4 baseline)
Gain Bandwidth Product: 800 MHz (OPA843IDG4 baseline)
-3dB Bandwidth: 500 MHz (OPA843IDG4 baseline)
Supply Voltage Range: 8V to 12V (OPA843IDG4 baseline)
Current - Output / Channel: 100 mA (OPA843IDG4 baseline)

Substitute parts identified:

Group 1 - Direct Texas Instruments Equivalent:

OPA843ID: Active product status, identical electrical specifications, packaging variation (Tube vs. Tape & Reel)

Group 2 - Analog Devices Alternatives:

AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7: Active product status, higher slew rate (1300V/µs), lower -3dB bandwidth (320 MHz), reduced input bias current (2 µA), improved input offset voltage (3 mV), lower supply current (17 mA), reduced output current (70 mA), expanded supply voltage range (6V to 12V)
AD9632ARZ, AD9632ARZ-REEL7: Active product status, highest slew rate (1500V/µs), lowest -3dB bandwidth (250 MHz), reduced input bias current (2 µA), improved input offset voltage (2 mV), lowest supply current (16 mA), reduced output current (70 mA), expanded supply voltage range (6V to 12V)

Parameter Comparison

Parameter	OPA843IDG4	OPA843ID	AD9631ARZ / AD9631ARZ-REEL / AD9631ARZ-REEL7	AD9632ARZ / AD9632ARZ-REEL7
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	1	1	1	1
Slew Rate	1000V/µs	1000V/µs	1300V/µs	1500V/µs
Gain Bandwidth Product	800 MHz	800 MHz	Not specified	Not specified
-3dB Bandwidth	500 MHz	500 MHz	320 MHz	250 MHz
Current - Input Bias	20 µA	20 µA	2 µA	2 µA
Voltage - Input Offset	300 µV	300 µV	3 mV	2 mV
Current - Supply	20.2 mA	20.2 mA	17 mA	16 mA
Current - Output / Channel	100 mA	100 mA	70 mA	70 mA
Voltage - Supply Span (Min)	8 V	8 V	6 V	6 V
Voltage - Supply Span (Max)	12 V	12 V	12 V	12 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

OPA843ID (Texas Instruments): This is the primary recommended substitute for OPA843IDG4. It maintains identical electrical specifications and operating characteristics while offering active product status and extended availability. The only difference is packaging format (Tube vs. Tape & Reel). Selection of OPA843ID is appropriate for applications requiring direct electrical equivalence with no circuit redesign.

AD9631ARZ / AD9631ARZ-REEL / AD9631ARZ-REEL7 (Analog Devices Inc.): These devices are suitable substitutes when higher slew rate performance (1300V/µs) is acceptable or beneficial. The reduced -3dB bandwidth (320 MHz) represents a trade-off compared to the OPA843IDG4 (500 MHz). These parts offer improved input bias current characteristics (2 µA vs. 20 µA) and lower supply current consumption (17 mA vs. 20.2 mA). The expanded minimum supply voltage (6V vs. 8V) provides additional design flexibility. All variants maintain ROHS3 compliance and feature superior moisture sensitivity rating (MSL 1 Unlimited vs. MSL 2 1 Year). Packaging options include Tube (AD9631ARZ), Tape & Reel (AD9631ARZ-REEL), and Cut Tape & Digi-Reel (AD9631ARZ-REEL7).

AD9632ARZ / AD9632ARZ-REEL7 (Analog Devices Inc.): These devices provide the highest slew rate (1500V/µs) among available substitutes. The -3dB bandwidth is reduced to 250 MHz. Input bias current is minimized at 2 µA with the lowest input offset voltage (2 mV) and supply current (16 mA). These characteristics make AD9632 variants suitable for applications prioritizing slew rate performance and power efficiency. Packaging options include Tube (AD9632ARZ) and Cut Tape & Digi-Reel (AD9632ARZ-REEL7).

All substitute parts maintain ROHS3 compliance, operate across the -40°C to 85°C temperature range, and are housed in identical 8-SOIC packages suitable for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can OPA843ID be used as a direct replacement for OPA843IDG4?

A: Yes. OPA843ID is a direct electrical equivalent with identical specifications. The difference is packaging format: OPA843IDG4 uses Tape & Reel packaging while OPA843ID is supplied in Tube format. Both are surface mount 8-SOIC packages with identical pinout and electrical performance. No circuit modifications are required.

Q: What are the key differences between OPA843IDG4 and the Analog Devices AD9631 series?

A: The primary differences are slew rate (1300V/µs vs. 1000V/µs), -3dB bandwidth (320 MHz vs. 500 MHz), input bias current (2 µA vs. 20 µA), and supply voltage minimum (6V vs. 8V). The AD9631 series offers faster slew rate and lower input bias current but reduced bandwidth. All maintain the same 8-SOIC package and operating temperature range.

Q: What are the key differences between OPA843IDG4 and the Analog Devices AD9632 series?

A: The AD9632 series provides the highest slew rate (1500V/µs) with the lowest input offset voltage (2 mV) and supply current (16 mA). The -3dB bandwidth is reduced to 250 MHz. Like the AD9631 series, the AD9632 supports a minimum supply voltage of 6V. All maintain the same 8-SOIC package and operating temperature range.

Q: Are all substitute parts available in multiple packaging formats?

A: OPA843ID is available in Tube packaging. AD9631ARZ variants are available in Tube (AD9631ARZ), Tape & Reel (AD9631ARZ-REEL), and Cut Tape & Digi-Reel (AD9631ARZ-REEL7) formats. AD9632ARZ variants are available in Tube (AD9632ARZ) and Cut Tape & Digi-Reel (AD9632ARZ-REEL7) formats. Selection depends on assembly process requirements and volume specifications.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. OPA843ID, AD9631ARZ series, and AD9632ARZ series are all ROHS3 compliant. All are also REACH unaffected and classified under ECCN EAR99.

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

A: OPA843IDG4 has MSL 2 (1 Year), while Analog Devices substitutes have MSL 1 (Unlimited). MSL 1 indicates superior moisture resistance and longer shelf life without requiring special storage conditions. This is an advantage for long-term inventory management and supply chain flexibility.

Q: Can I use AD9631 or AD9632 if my application requires the full 500 MHz bandwidth of the OPA843IDG4?

A: No. The AD9631 series provides 320 MHz bandwidth and the AD9632 series provides 250 MHz bandwidth. If your application requires 500 MHz bandwidth, OPA843ID is the appropriate substitute. The Analog Devices alternatives are suitable only for applications with bandwidth requirements of 320 MHz or lower.

Q: What is the impact of reduced output current on circuit design?

A: OPA843IDG4 provides 100 mA output current per channel, while AD9631 and AD9632 series provide 70 mA. If your application requires output currents exceeding 70 mA, OPA843ID must be used. For applications requiring 70 mA or less, the Analog Devices alternatives are suitable.

Q: Are there any supply voltage considerations when switching to Analog Devices substitutes?

A: Yes. OPA843IDG4 requires a minimum supply voltage of 8V, while AD9631 and AD9632 series support operation at 6V minimum. This expanded range provides additional design flexibility for lower-voltage applications. The maximum supply voltage remains 12V for all devices.

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