AD8628ARZ Equivalent & Substitute Parts

Part Overview

The AD8628ARZ is an active zero-drift operational amplifier manufactured by Analog Devices Inc., designed for precision analog signal conditioning applications. This single-circuit, rail-to-rail output amplifier operates across a 2.7 V to 5 V supply range with exceptionally low input offset voltage of 1 µV and minimal input bias current of 30 pA. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the AD8628ARZ becomes unavailable, when alternative packaging formats are required for specific PCB layouts, or when application requirements demand different performance characteristics within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Zero-Drift	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	1	V/µs
Gain Bandwidth Product	2.5	MHz
Voltage - Input Offset	1	µV
Current - Input Bias	30	pA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5	V
Operating Temperature Range	-40 to 125	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the AD8628ARZ is based on the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: Zero-Drift topology for precision offset voltage performance
Number of Circuits: Single-circuit configuration
Output Type: Rail-to-Rail capability
Voltage Supply Range: Minimum 2.7 V to maximum 5 V compatibility
Package Format: 8-pin surface mount variants (8-SOIC, 8-MSOP, 8-TSSOP)
Operating Temperature: Extended range -40°C to 125°C
Compliance: RoHS3 and REACH requirements

Secondary Performance Parameters:

Input Offset Voltage: Precision-grade specifications (≤ 1 µV preferred)
Input Bias Current: Low-leakage performance (≤ 100 pA preferred)
Gain Bandwidth Product: 2.5 MHz minimum for signal fidelity
Slew Rate: 1 V/µs minimum for transient response

The substitute parts listed below meet the primary criteria with varying degrees of secondary parameter alignment. Substitutes are grouped by amplifier topology and electrical performance class.

Parameter Comparison

Parameter	AD8628ARZ	ADA4528-1ARMZ	INA828ID	LM324DR2G	TL082CD	TS922IYDT
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	onsemi	STMicroelectronics	STMicroelectronics
Amplifier Type	Zero-Drift	Zero-Drift	Instrumentation	General Purpose	J-FET	General Purpose
Number of Circuits	1	1	1	4	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	—	—	—	Rail-to-Rail
Slew Rate (V/µs)	1	0.5	1.2	—	16	1.3
Gain Bandwidth Product (MHz)	2.5	4	—	1	3	4
Voltage - Input Offset (µV)	1	0.3	20	2000	3000	3000
Current - Input Bias (pA)	30	90	150	90000	20	15000
Current - Supply (mA)	0.85	1.5	0.6	—	1.4	2
Current - Output / Channel (mA)	30	40	—	40	10	80
Voltage - Supply Span Min (V)	2.7	2.2	4.5	3	6	2.7
Voltage - Supply Span Max (V)	5	5.5	36	32	36	12
Operating Temperature (°C)	-40 to 125	-40 to 125	-40 to 125	0 to 70	0 to 70	-40 to 125
Package / Case	8-SOIC	8-MSOP	8-SOIC	14-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalent:

ADA4528-1ARMZ (Analog Devices Inc.) is the closest functional equivalent to the AD8628ARZ. Both devices are zero-drift operational amplifiers with rail-to-rail output, single-circuit configuration, and extended temperature range (-40°C to 125°C). The ADA4528-1ARMZ offers superior input offset voltage performance (0.3 µV versus 1 µV) and higher gain bandwidth product (4 MHz versus 2.5 MHz). The primary difference is packaging format: 8-MSOP versus 8-SOIC. Both are RoHS3 compliant with MSL 1 rating. Supply voltage range is slightly wider (2.2 V to 5.5 V). This substitute is suitable for applications where the 8-MSOP package footprint is acceptable.

Tier 2 - Compatible Topology, Extended Supply Range:

INA828ID (Texas Instruments) is an instrumentation amplifier with single-circuit configuration in 8-SOIC package. Operating temperature range matches the AD8628ARZ (-40°C to 125°C). However, this device requires minimum 4.5 V supply (versus 2.7 V for AD8628ARZ) and has significantly higher input offset voltage (20 µV). The instrumentation amplifier topology differs from zero-drift, making this suitable only for applications where instrumentation-grade precision and higher supply voltages are available.

Tier 3 - Package-Compatible, Performance Trade-offs:

TL082CD (STMicroelectronics) is a J-FET operational amplifier in 8-SOIC package with 2-circuit configuration. This device has superior slew rate (16 V/µs) but requires minimum 6 V supply and operates only to 70°C maximum temperature. Input offset voltage is significantly higher (3 mV). This substitute is applicable only when higher slew rate is required and supply voltage exceeds 6 V.

TS922IYDT (STMicroelectronics) is a general-purpose, rail-to-rail amplifier with 2-circuit configuration in 8-SOIC package. Extended temperature range (-40°C to 125°C) and supply range (2.7 V to 12 V) match the AD8628ARZ requirements. However, input offset voltage (3 mV) and input bias current (15 nA) are significantly degraded compared to the zero-drift AD8628ARZ. This substitute is suitable for non-precision applications where dual-circuit configuration is beneficial.

Tier 4 - Limited Compatibility:

LM324DR2G (onsemi) is a general-purpose amplifier with 4-circuit configuration in 14-SOIC package. Operating temperature range is restricted to 0°C to 70°C, and input offset voltage is 2 mV. This device is suitable only for commercial-temperature applications with relaxed precision requirements and where multiple amplifier circuits are needed.

All listed substitutes maintain RoHS3 compliance and REACH unaffected status. Selection should prioritize Tier 1 equivalents for precision applications requiring zero-drift performance.

Frequently Asked Questions (FAQ)

Q: Can the ADA4528-1ARMZ directly replace the AD8628ARZ on the same PCB?

A: The ADA4528-1ARMZ uses 8-MSOP packaging (0.118" width) versus the AD8628ARZ 8-SOIC packaging (0.154" width). While both are 8-pin surface mount devices, the footprints are different. PCB layout modification is required. Electrical functionality is compatible, with the ADA4528-1ARMZ offering superior performance specifications.

Q: What is the key difference between zero-drift and instrumentation amplifier topologies?

A: Zero-drift amplifiers (AD8628ARZ, ADA4528-1ARMZ) use internal chopper-stabilization techniques to achieve extremely low input offset voltage (< 1 µV) and are optimized for single-ended or differential signal conditioning. Instrumentation amplifiers (INA828ID) are configured for high common-mode rejection and are designed for differential measurement applications with integrated gain-setting resistors. The INA828ID requires higher minimum supply voltage (4.5 V).

Q: Is the TS922IYDT suitable for precision offset-critical applications?

A: No. The TS922IYDT is a general-purpose amplifier with 3 mV input offset voltage, which is 3000 times higher than the AD8628ARZ (1 µV). This device is suitable only for applications where offset voltage is not a critical parameter. For precision applications, Tier 1 substitutes (ADA4528-1ARMZ) are required.

Q: Why does the LM324DR2G have a restricted operating temperature range?

A: The LM324DR2G is specified for commercial temperature range (0°C to 70°C) only. The AD8628ARZ is specified for industrial temperature range (-40°C to 125°C). The LM324DR2G is not suitable for applications requiring extended temperature operation below 0°C or above 70°C.

Q: Can I use the TL082CD in a 2.7 V to 5 V supply application?

A: No. The TL082CD requires minimum 6 V supply voltage. It cannot operate in the 2.7 V to 5 V range specified for the AD8628ARZ. This device is suitable only for applications with supply voltages of 6 V or higher.

Q: What does MSL 1 (Unlimited) rating mean for component storage?

A: MSL 1 rating indicates unlimited shelf life without moisture bake-out requirements. Both the AD8628ARZ and most substitute parts (ADA4528-1ARMZ, LM324DR2G, TL082CD, TS922IYDT) carry MSL 1 rating. The INA828ID carries MSL 2 rating, requiring moisture bake-out after 1 year of storage.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed (ADA4528-1ARMZ, INA828ID, LM324DR2G, TL082CD, TS922IYDT) are RoHS3 compliant and REACH unaffected, matching the compliance status of the AD8628ARZ.

Q: What is the significance of rail-to-rail output capability?

A: Rail-to-rail output means the amplifier output can swing to within a few millivolts of both positive and negative supply rails. This maximizes the usable output voltage range. The AD8628ARZ, ADA4528-1ARMZ, and TS922IYDT all feature rail-to-rail output. The INA828ID, LM324DR2G, and TL082CD do not specify this capability, limiting output swing range.

Q: Can I substitute a 2-circuit device (TS922IYDT) for a 1-circuit device (AD8628ARZ)?

A: Electrically, yes, if only one circuit is required. However, the TS922IYDT has degraded precision specifications (3 mV offset versus 1 µV). The unused second circuit adds cost and PCB area. Substitution is practical only when the second circuit provides functional benefit or when precision requirements are relaxed.

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