AD704AR-16 Equivalent & Substitute Parts

Part Overview

The AD704AR-16 is a general-purpose operational amplifier integrated circuit manufactured by Analog Devices Inc., configured as a quad amplifier (4 circuits) in a 16-SOIC surface mount package. This device is classified as obsolete, indicating it has been discontinued from active production. The AD704AR-16 operates across a wide supply voltage range of 4V to 36V and is suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current characteristics.

Due to its obsolete status, locating replacement units from original inventory becomes increasingly difficult. Identifying equivalent and substitute parts ensures design continuity and maintains access to functionally compatible alternatives that meet the electrical and mechanical requirements of the original specification.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.1	V/µs
Gain Bandwidth Product	800	kHz
-3dB Bandwidth	800	kHz
Current - Input Bias	100	pA
Voltage - Input Offset	50	µV
Current - Supply (x4 Channels)	1.5	mA
Current - Output / Channel	15	mA
Voltage - Supply Span (Min)	4	V
Voltage - Supply Span (Max)	36	V
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	16-SOIC (0.295", 7.50mm Width)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AD704AR-16 is determined by compatibility across the following critical parameters:

Functional Equivalence Criteria:

Number of circuits (4 channels required)
Amplifier type (general-purpose operation)
Supply voltage range compatibility (minimum 4V, maximum 36V or greater)
Operating temperature range (minimum -40°C, maximum 85°C or greater)
Mounting type (surface mount)

Electrical Performance Considerations:

Slew rate, gain bandwidth product, and input bias current define performance tier
Output current capability must support application requirements
Input offset voltage and supply current affect circuit behavior

Mechanical Compatibility:

Package type and pin configuration determine PCB layout compatibility
16-SOIC package variants with 0.295" width maintain footprint compatibility

The substitute parts listed below are grouped into two categories: direct equivalents (identical electrical and mechanical specifications with different product status or packaging) and similar alternatives (functionally compatible with specified parameter variations).

Parameter Comparison

Parameter	AD704AR-16	AD704ARZ-16	AD8624ACPZ-RL	LT1114IS	LT1114S	LT1125MPSW#PBF	LT1125MPSW#TRPBF
Manufacturer	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Number of Circuits	4	4	4	4	4	4	4
Slew Rate (V/µs)	0.1	0.1	0.48	0.3	0.3	4.5	4.5
Gain Bandwidth Product (kHz)	800	800	560	750	750	12500	12500
Current - Input Bias (pA)	100	100	45	70	70	8000	8000
Voltage - Input Offset (µV)	50	50	10	20	20	30	30
Current - Supply (mA, x4 Channels)	1.5	1.5	0.215	0.35	0.35	2.3	2.3
Current - Output / Channel (mA)	15	15	40	—	—	—	—
Voltage - Supply Span Min (V)	4	4	5	2	2	8	8
Voltage - Supply Span Max (V)	36	36	30	40	40	44	44
Operating Temperature Range (°C)	-40 to 85	-40 to 85	-40 to 125	-40 to 85	0 to 70	-55 to 125	-55 to 125
Package / Case	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-WQFN CSP (4x4)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

The AD704ARZ-16 is the direct equivalent to the AD704AR-16. Both devices share identical electrical specifications, operating parameters, and package configuration. The primary distinction is product status: AD704ARZ-16 is active and currently in production, whereas AD704AR-16 is obsolete. The AD704ARZ-16 is packaged in tube format and maintains full compatibility with existing designs. This part is the preferred choice for direct replacement in new procurement or redesign efforts.

Compatible Alternatives (Performance Tier Considerations):

The LT1114IS and LT1114S are compatible general-purpose quad amplifiers with similar bandwidth characteristics (750 kHz gain bandwidth product). Both operate within the required temperature range and support the supply voltage requirements. The LT1114IS maintains the full -40°C to 85°C operating range, while LT1114S operates over 0°C to 70°C. These devices feature lower supply current (350 µA vs. 1.5 mA) and improved input bias current characteristics (70 pA vs. 100 pA). Package width differs (0.154" vs. 0.295"), requiring PCB layout verification.

The LT1125MPSW#PBF and LT1125MPSW#TRPBF represent higher-performance alternatives with significantly enhanced bandwidth (12.5 MHz), slew rate (4.5 V/µs), and extended temperature range (-55°C to 125°C). These devices maintain the 16-SOIC 0.295" package footprint. Supply voltage minimum requirement is 8V (vs. 4V), which must be verified against application constraints. These parts are suitable for applications requiring higher frequency response.

The AD8624ACPZ-RL is a rail-to-rail output amplifier in a compact 16-WQFN package. This device offers improved input offset voltage (10 µV), higher output current capability (40 mA), and extended temperature range (-40°C to 125°C). The package format differs significantly from the original 16-SOIC, requiring complete PCB redesign. Moisture sensitivity level is elevated to MSL 3.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can AD704ARZ-16 be used as a direct replacement for AD704AR-16?

A: Yes. The AD704ARZ-16 is electrically and mechanically identical to the AD704AR-16. Both devices feature the same 16-SOIC 0.295" package, identical electrical specifications, and equivalent performance characteristics. The primary difference is product status: AD704ARZ-16 is active and available from current inventory, while AD704AR-16 is obsolete. No circuit modifications are required for substitution.

Q: What are the key differences between the AD704 series and the LT1114 series?

A: The LT1114 series offers lower supply current consumption (350 µA vs. 1.5 mA) and improved input bias current (70 pA vs. 100 pA), making it suitable for power-sensitive applications. Gain bandwidth product is slightly lower (750 kHz vs. 800 kHz). The LT1114IS maintains the full -40°C to 85°C temperature range. Package width is narrower (0.154" vs. 0.295"), which may require PCB layout adjustments but provides space savings.

Q: When should the LT1125MPSW series be considered?

A: The LT1125MPSW series is appropriate for applications requiring higher bandwidth (12.5 MHz vs. 800 kHz), faster slew rate (4.5 V/µs vs. 0.1 V/µs), and extended temperature range (-55°C to 125°C). These devices maintain the 16-SOIC 0.295" package footprint for direct PCB compatibility. The minimum supply voltage requirement is 8V, which must be verified against application power supply specifications.

Q: Is the AD8624ACPZ-RL compatible with existing PCB layouts?

A: No. The AD8624ACPZ-RL uses a 16-WQFN CSP package (4x4 mm), which differs significantly from the 16-SOIC package of the AD704AR-16. Complete PCB redesign is required for this substitution. The AD8624ACPZ-RL offers advantages including rail-to-rail output, improved input offset voltage (10 µV), and higher output current (40 mA), but these benefits require layout modifications.

Q: What is the significance of package width differences (0.154" vs. 0.295")?

A: Package width affects PCB footprint and component spacing. The 16-SOIC 0.295" width (used by AD704AR-16, AD704ARZ-16, and LT1125MPSW series) is wider than the 0.154" width (used by LT1114 series). Devices with matching package widths maintain identical PCB footprints and require no layout modifications. Narrower packages provide space savings but may require PCB redesign if switching from wider packages.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed (AD704ARZ-16, AD8624ACPZ-RL, LT1114IS, LT1114S, LT1125MPSW#PBF, and LT1125MPSW#TRPBF) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the difference between LT1125MPSW#PBF and LT1125MPSW#TRPBF?

A: Both devices are electrically identical with identical specifications. The primary difference is packaging format: LT1125MPSW#PBF is supplied in tube packaging, while LT1125MPSW#TRPBF is supplied in tape and reel format. Selection depends on procurement and assembly requirements. Tape and reel format is typically preferred for automated assembly processes.

Q: What supply voltage range must be verified when substituting parts?

A: The AD704AR-16 operates from 4V to 36V. Substitute parts have varying requirements: AD704ARZ-16 (4V to 36V), LT1114 series (2V to 40V), LT1125MPSW series (8V to 44V), and AD8624ACPZ-RL (5V to 30V). Applications using supply voltages below 5V or between 30V and 36V must select parts with compatible ranges. The LT1114 series offers the widest minimum voltage support (2V), while the LT1125MPSW series requires minimum 8V.

Q: How does input bias current affect circuit design?

A: Input bias current determines the input impedance and affects circuit accuracy in high-impedance applications. The AD704AR-16 has 100 pA input bias current. Lower values (LT1114 at 70 pA, AD8624ACPZ-RL at 45 pA) reduce input current errors and are preferred for precision applications. Higher values (LT1125MPSW at 8 nA) are acceptable in applications where input impedance is not critical. Substitution with significantly different input bias current may require circuit compensation adjustments.

Q: What is the Moisture Sensitivity Level (MSL) and why does it matter?

A: MSL indicates the maximum time a component can be exposed to moisture before soldering without baking. MSL 1 (unlimited) means no time restriction, while MSL 3 (168 hours) requires baking if storage exceeds 168 hours in high-humidity conditions. The AD704AR-16 and most substitutes are MSL 1. The AD8624ACPZ-RL is MSL 3, requiring additional handling procedures for long-term storage.

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