OPA842IDG4 Equivalent & Substitute Parts Reference

Part Overview

The OPA842IDG4 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 OPA842IDG4 delivers a 400V/µs slew rate with 200 MHz gain bandwidth product, designed for applications requiring single-channel voltage feedback amplification within a 10V to 12V supply span.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the OPA842IDG4 is determined by strict electrical and mechanical compatibility within the voltage feedback amplifier category. The primary substitution criteria are:

Mandatory Compatibility Parameters:

Amplifier Type: Voltage Feedback (single circuit)
Package / Case: 8-SOIC surface mount configuration
Operating Temperature Range: -40°C to 85°C minimum
Supply Voltage Compatibility: Minimum 10V to 12V span requirement

Electrical Performance Considerations: Substitute parts must maintain functional equivalence in slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current specifications. Parts with superior electrical performance (higher slew rate, lower input offset voltage, lower input bias current) are acceptable substitutes provided they maintain the same package and temperature rating.

Active Product Status Priority: The OPA842IDG4 is obsolete. Substitute parts OPA842ID, AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7, and LT1815IS8#PBF all maintain active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	Gain Bandwidth / -3dB Bandwidth (MHz)	Input Bias Current (µA)	Input Offset Voltage (µV / mV)	Supply Current (mA)	Output Current (mA)	Supply Span Min (V)	Supply Span Max (V)	Package	Packaging Type	MSL Rating
OPA842IDG4	Texas Instruments	Obsolete	400	200	20	300 µV	20.2	100	10	12	8-SOIC	—	2 (1 Year)
OPA842ID	Texas Instruments	Active	400	200	20	300 µV	20.2	100	10	12	8-SOIC	Tube	2 (1 Year)
AD9631ARZ	Analog Devices Inc.	Active	1300	320	2	3 mV	17	70	6	12	8-SOIC	Tube	1 (Unlimited)
AD9631ARZ-REEL	Analog Devices Inc.	Active	1300	320	2	3 mV	17	70	6	12	8-SOIC	Tape & Reel (TR)	1 (Unlimited)
AD9631ARZ-REEL7	Analog Devices Inc.	Active	1300	320	2	3 mV	17	70	6	12	8-SOIC	Cut Tape (CT) & Digi-Reel®	1 (Unlimited)
AD9632ARZ	Analog Devices Inc.	Active	1500	250	2	2 mV	16	70	6	12	8-SOIC	Tube	1 (Unlimited)
AD9632ARZ-REEL7	Analog Devices Inc.	Active	1500	250	2	2 mV	16	70	6	12	8-SOIC	Cut Tape (CT) & Digi-Reel®	1 (Unlimited)
LT1815IS8#PBF	Analog Devices Inc.	Active	1500	220 / 350	2	200 µV	6.5	—	2.5	11	8-SOIC	Tube	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: OPA842ID

The OPA842ID is the direct active equivalent of the OPA842IDG4. It maintains identical electrical specifications (400V/µs slew rate, 200 MHz gain bandwidth product, 20µA input bias current, 300µV input offset voltage) and operates within the same 10V to 12V supply span. The OPA842ID differs only in product status (active versus obsolete) and packaging format (tube versus unspecified). This part provides seamless functional replacement with confirmed long-term availability. RoHS3 compliance and MSL 2 rating are maintained.

Secondary Recommendations: AD9631ARZ / AD9631ARZ-REEL / AD9631ARZ-REEL7

The AD9631 series (Analog Devices Inc.) offers superior electrical performance with 1300V/µs slew rate and 320 MHz bandwidth. Input bias current is reduced to 2µA, and input offset voltage is 3mV. These devices operate across a wider supply range (6V to 12V), providing greater design flexibility. The AD9631 series maintains 8-SOIC packaging and -40°C to 85°C temperature rating. Packaging variants include tube (AD9631ARZ), tape & reel (AD9631ARZ-REEL), and cut tape with Digi-Reel (AD9631ARZ-REEL7). MSL rating improves to 1 (unlimited). All variants maintain ROHS3 compliance.

Tertiary Recommendations: AD9632ARZ / AD9632ARZ-REEL7

The AD9632 series delivers 1500V/µs slew rate with 250 MHz bandwidth and further reduced input offset voltage (2mV). Supply current is minimized at 16mA. These devices maintain 8-SOIC packaging, -40°C to 85°C operation, and 6V to 12V supply compatibility. Packaging options include tube (AD9632ARZ) and cut tape with Digi-Reel (AD9632ARZ-REEL7). MSL rating is 1 (unlimited) with ROHS3 compliance.

Alternative Consideration: LT1815IS8#PBF

The LT1815IS8#PBF (Analog Devices Inc.) provides 1500V/µs slew rate with 220 MHz gain bandwidth product and 350 MHz -3dB bandwidth. Input offset voltage is superior at 200µV. This device operates across an extended supply range (2.5V to 11V) and draws only 6.5mA supply current. The 8-SOIC package and -40°C to 85°C temperature rating are maintained. MSL rating is 1 (unlimited) with ROHS3 compliance. Note: Output current specification is not provided for this part.

Compliance and Certification Status

All recommended substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification, matching the OPA842IDG4 regulatory profile. Moisture sensitivity levels for Analog Devices parts improve to MSL 1 (unlimited storage), compared to the original MSL 2 (1 year) rating.

Frequently Asked Questions (FAQ)

Q1: Can OPA842ID directly replace OPA842IDG4 in existing designs?

Yes. The OPA842ID maintains identical electrical specifications and 8-SOIC package configuration. The only differences are product status (active versus obsolete) and packaging format. No circuit redesign is required. Verify that your assembly process accommodates tube packaging if the original design specified a different packaging format.

Q2: What are the key differences between OPA842ID and the AD9631 series?

The AD9631 series offers superior performance: slew rate increases from 400V/µs to 1300V/µs, bandwidth increases from 200 MHz to 320 MHz, input bias current decreases from 20µA to 2µA, and input offset voltage increases from 300µV to 3mV. The AD9631 operates across a wider supply range (6V to 12V versus 10V to 12V). All devices maintain 8-SOIC packaging and -40°C to 85°C operation. The AD9631 is suitable for designs requiring higher speed performance.

Q3: Why does the AD9632 series have lower supply current than OPA842ID?

The AD9632 series is designed with lower quiescent current (16mA versus 20.2mA) while delivering higher slew rate (1500V/µs) and improved input offset voltage (2mV). This represents a more modern design approach optimizing for both performance and power efficiency. The trade-off is slightly lower bandwidth (250 MHz versus 200 MHz for OPA842ID).

Q4: What is the difference between AD9631ARZ, AD9631ARZ-REEL, and AD9631ARZ-REEL7?

These are identical devices in different packaging formats. AD9631ARZ is supplied in tube packaging. AD9631ARZ-REEL is supplied in tape & reel format. AD9631ARZ-REEL7 is supplied in cut tape with Digi-Reel format. Electrical specifications and performance are identical. Selection depends on your assembly equipment and procurement requirements.

Q5: Can LT1815IS8#PBF be used in applications requiring 100mA output current?

The LT1815IS8#PBF output current specification is not provided in the available data. The OPA842IDG4 specifies 100mA output current per channel. Before selecting LT1815IS8#PBF for applications requiring this output current level, verify the device's output current capability against your specific application requirements.

Q6: Are all substitute parts RoHS3 compliant?

Yes. All recommended substitute parts (OPA842ID, AD9631ARZ, AD9631ARZ-REEL, AD9631ARZ-REEL7, AD9632ARZ, AD9632ARZ-REEL7, and LT1815IS8#PBF) maintain ROHS3 compliance, matching the OPA842IDG4 regulatory status.

Q7: What is the significance of MSL rating differences?

The OPA842IDG4 carries MSL 2 (1 Year), meaning the component must be used within one year of moisture exposure. All Analog Devices substitute parts carry MSL 1 (Unlimited), allowing indefinite storage after moisture exposure. This improves supply chain flexibility and reduces risk of moisture-related failures in long-term inventory.

Q8: Which substitute part offers the best overall performance?

The AD9632ARZ and AD9632ARZ-REEL7 deliver the highest slew rate (1500V/µs), lowest input offset voltage (2mV), and lowest supply current (16mA). However, "best" depends on application requirements. For direct replacement with minimal circuit changes, OPA842ID is optimal. For high-speed applications, AD9632 series is recommended. For balanced performance across multiple parameters, AD9631 series provides excellent mid-range characteristics.

Q9: Can these parts be used interchangeably in the same PCB assembly?

All substitute parts use identical 8-SOIC (0.154", 3.90mm Width) packaging, enabling direct PCB footprint compatibility. However, electrical parameter differences (particularly slew rate, bandwidth, and input offset voltage) may affect circuit performance. Verify that your application tolerances accommodate the electrical specifications of the selected substitute before assembly.

Q10: What supply voltage range should I use for maximum compatibility?

The OPA842IDG4 requires 10V to 12V supply span. Substitute parts offer wider ranges: AD9631/AD9632 series operate from 6V to 12V, and LT1815IS8#PBF operates from 2.5V to 11V. If your design currently uses 10V to 12V, all substitutes are compatible. If you require operation below 10V, select AD9631, AD9632, or LT1815IS8#PBF. Verify your specific supply voltage requirements before final part selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message