OP42GSZ Equivalent & Substitute Parts

Part Overview

The OP42GSZ is a J-FET input operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This single-circuit amplifier is designed for applications requiring low input bias current and high input impedance characteristics typical of J-FET input stages. The part is currently in Active product status with 2920 units in stock.

Substitute parts are necessary when the OP42GSZ becomes unavailable, when alternative packaging formats are required, or when design specifications allow for equivalent performance characteristics within defined electrical parameters. Several equivalent alternatives exist across multiple manufacturers, each with distinct advantages in terms of product status, compliance certifications, and electrical performance metrics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	50	V/µs
Gain Bandwidth Product	10	MHz
Current - Input Bias	130	pA
Voltage - Input Offset	1.5	mV
Current - Supply	5.1	mA
Current - Output / Channel	33	mA
Voltage - Supply Span (Min)	16	V
Voltage - Supply Span (Max)	40	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	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the OP42GSZ is determined by alignment across the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC surface mount package format (0.154", 3.90mm width) to ensure direct PCB compatibility without layout modifications.

Amplifier Type: The OP42GSZ is a J-FET input amplifier. Direct substitutes maintain J-FET input architecture. General Purpose amplifiers are listed as secondary alternatives where circuit design permits relaxed input bias current specifications.

Electrical Performance Envelope: Substitute parts must operate within the defined supply voltage range (minimum 16V to maximum 40V for primary J-FET substitutes). Gain bandwidth product of 10 MHz is a key performance metric for signal fidelity. Slew rate, input bias current, and input offset voltage determine suitability for precision applications.

Operating Temperature Range: The OP42GSZ operates from -40°C to 85°C. Substitutes with identical or extended temperature ranges ensure thermal compatibility.

Compliance & Product Status: Active status parts are preferred for new designs. Last Time Buy and Obsolete designations indicate limited availability. RoHS3 compliance and MSL ratings affect supply chain reliability and manufacturing process compatibility.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status	RoHS
OP42GSZ	Analog Devices	J-FET	50	10	130	1.5	16	40	-40 to 85	Active	ROHS3
OPA137UA	Texas Instruments	J-FET	3.5	1	5	2.5	4.5	36	-40 to 85	Active	ROHS3
TLE2071CD	Texas Instruments	J-FET	45	10	20	0.49	4.5	38	0 to 70	Last Time Buy	ROHS3
OPA604AU	Texas Instruments	General Purpose	25	20	5	1	9	48	-25 to 85	Active	ROHS3
OPA604AU/2K5	Texas Instruments	General Purpose	25	20	5	1	9	48	-25 to 85	Active	ROHS3
SA5534PSR	Texas Instruments	General Purpose	13	10	500	0.5	10	30	-40 to 85	Last Time Buy	ROHS3
SA5534D	Texas Instruments	General Purpose	13	10	500	0.5	10	30	-40 to 85	Last Time Buy	ROHS3
SA5534ADR	Texas Instruments	General Purpose	13	10	500	0.5	10	30	-40 to 85	Last Time Buy	ROHS3
SA5534AD	onsemi	General Purpose	13	10	500	0.5	6	40	-40 to 85	Obsolete	Non-compliant
NE5534D	onsemi	General Purpose	13	10	500	0.5	6	40	0 to 70	Obsolete	Non-compliant
NE5534AD	onsemi	General Purpose	13	10	500	0.5	6	40	0 to 70	Obsolete	Non-compliant

Engineering Selection Recommendations

Primary J-FET Substitutes (Amplifier Type Match)

The OPA137UA from Texas Instruments is an Active status J-FET amplifier with ROHS3 compliance and identical operating temperature range (-40°C to 85°C). It maintains the 8-SOIC package format and single-circuit configuration. However, the OPA137UA exhibits significantly lower slew rate (3.5 V/µs versus 50 V/µs) and reduced gain bandwidth product (1 MHz versus 10 MHz), making it suitable only for applications where bandwidth and slew rate requirements are relaxed.

The TLE2071CD from Texas Instruments is a J-FET amplifier with slew rate (45 V/µs) and gain bandwidth product (10 MHz) closely matching the OP42GSZ. It carries ROHS3 compliance and the correct 8-SOIC package. However, TLE2071CD is designated Last Time Buy with a restricted operating temperature range (0°C to 70°C), limiting its use in applications requiring the full -40°C to 85°C specification.

Secondary General Purpose Substitutes (Relaxed Input Bias Current)

The OPA604AU and OPA604AU/2K5 from Texas Instruments are Active status general purpose amplifiers with ROHS3 compliance. These parts offer higher gain bandwidth product (20 MHz) and extended supply voltage range (9V to 48V). Input bias current is significantly higher (5 pA versus 130 pA), making these suitable for applications where input impedance is less critical. Both variants are available in 8-SOIC packages with identical electrical specifications; OPA604AU/2K5 is supplied in Cut Tape & Digi-Reel packaging.

The SA5534PSR, SA5534D, and SA5534ADR from Texas Instruments are general purpose amplifiers with 10 MHz gain bandwidth product matching the OP42GSZ. All three carry ROHS3 compliance and -40°C to 85°C operating range. SA5534PSR is packaged in Tape & Reel format with 8-SO package (0.209", 5.30mm width), requiring PCB layout verification. SA5534D and SA5534ADR are designated Last Time Buy, indicating limited future availability.

Obsolete Alternatives (Not Recommended for New Designs)

The SA5534AD, NE5534D, and NE5534AD from onsemi are obsolete general purpose amplifiers. These parts lack ROHS3 compliance and carry RoHS non-compliant designations. NE5534D and NE5534AD have restricted operating temperature range (0°C to 70°C). These alternatives are listed for reference only in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q: Can the OPA137UA directly replace the OP42GSZ in all applications?

A: The OPA137UA maintains J-FET input architecture and identical operating temperature range, but exhibits significantly reduced slew rate (3.5 V/µs versus 50 V/µs) and gain bandwidth product (1 MHz versus 10 MHz). Direct substitution is valid only for applications where these reduced performance metrics are acceptable. Circuit simulation or bench testing is required to confirm compatibility with specific signal bandwidth requirements.

Q: What is the difference between SA5534PSR and SA5534D?

A: Both parts are general purpose amplifiers with identical electrical specifications (13 V/µs slew rate, 10 MHz gain bandwidth product, -40°C to 85°C operating range, and ROHS3 compliance). The primary difference is packaging: SA5534PSR uses 8-SO package (0.209", 5.30mm width) in Tape & Reel format, while SA5534D uses 8-SOIC package (0.154", 3.90mm width) in Tube format. PCB footprint compatibility must be verified before selection.

Q: Why is the TLE2071CD listed as Last Time Buy?

A: Last Time Buy designation indicates the manufacturer has announced end-of-life for this product. Existing inventory is available for purchase, but no future production is planned. For new designs requiring extended product lifecycle, Active status alternatives such as OPA604AU or OPA137UA are recommended.

Q: Are the onsemi NE5534 and SA5534 series suitable for new designs?

A: The onsemi NE5534D and SA5534AD variants are designated Obsolete with RoHS non-compliant status. These parts are not recommended for new designs due to limited availability and regulatory compliance concerns. Texas Instruments SA5534 variants (SA5534PSR, SA5534D, SA5534ADR) offer ROHS3 compliance but are designated Last Time Buy. For new designs, Active status parts such as OPA604AU or OPA137UA are preferred.

Q: What is the significance of the 8-SOIC package width specification?

A: The OP42GSZ uses 8-SOIC package with 0.154" (3.90mm) width. Most substitute parts maintain this identical package specification, ensuring direct PCB footprint compatibility. The SA5534PSR variant uses 8-SO package with 0.209" (5.30mm) width, which has a different footprint. PCB layout verification is mandatory before selecting this alternative.

Q: Can general purpose amplifiers replace J-FET input amplifiers?

A: General purpose amplifiers such as the OPA604AU and SA5534 series have significantly higher input bias current (5 nA to 500 nA versus 130 pA for the OP42GSZ). Substitution is valid only in applications where input impedance and bias current specifications are not critical. High-impedance signal sources or precision transducer interfaces may require J-FET input architecture to maintain signal integrity.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. ROHS3 compliant parts are required for most commercial and industrial applications. Parts designated RoHS non-compliant may face supply chain restrictions and regulatory barriers in certain markets.

Q: How does supply voltage range affect substitution decisions?

A: The OP42GSZ operates from 16V to 40V minimum supply span. Substitutes with narrower supply ranges (such as SA5534 series at 10V to 30V) may not function in applications requiring the full 16V to 40V envelope. Conversely, substitutes with extended ranges (such as OPA604AU at 9V to 48V) offer greater design flexibility. Circuit power supply specifications must be verified against substitute part ratings.

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