OP285GS-REEL Equivalent & Substitute Parts

Part Overview

The OP285GS-REEL is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-circuit (2-channel) device in an 8-SOIC surface mount package. This component is classified as obsolete, indicating that direct procurement from original manufacturing channels may be limited. The OP285GS-REEL operates across a wide supply voltage range (9V to 44V) and maintains stable performance across industrial temperature ranges (-40°C to 85°C). Identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring J-FET amplifier characteristics or compatible general-purpose amplifier functionality.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	22	V/µs
Gain Bandwidth Product	9	MHz
Current - Input Bias	100	nA
Voltage - Input Offset	35	µV
Current - Supply	4	mA
Voltage - Supply Span (Min)	9	V
Voltage - Supply Span (Max)	44	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the OP285GS-REEL is determined by compatibility across the following critical parameters: amplifier type (J-FET or general-purpose), number of circuits (dual-channel configuration), package format (8-SOIC surface mount), supply voltage range (minimum 9V, maximum 44V), operating temperature range (-40°C to 85°C), and electrical performance metrics (slew rate, gain bandwidth product, input bias current, and input offset voltage).

Substitute parts are grouped into two categories:

Direct Equivalent (Packaging Variant): The OP285GSZ-REEL represents a direct functional equivalent with identical electrical specifications but differs in packaging format (Tape & Reel) and product status (Active). This part maintains all core J-FET amplifier characteristics and is the primary recommendation for direct replacement.

Functional Alternatives (J-FET Amplifiers): The TL072CDT is a J-FET input amplifier with comparable architecture. While it exhibits lower slew rate (16V/µs versus 22V/µs) and reduced gain bandwidth product (4 MHz versus 9 MHz), it operates within the required supply voltage range and temperature specifications, making it suitable for applications where J-FET input characteristics are essential but performance headroom exists.

General-Purpose Alternatives: Parts including the ADA4075-2ARZ-RL, LT1124CS8#TR, MC4558CDT, MC4558IDT, LME49860MAX/NOPB, MC1458DT, OPA2277MDTEP, and TJM4558CDT provide dual-channel amplification in 8-SOIC packages with active product status and modern compliance certifications. These alternatives accommodate applications where J-FET input characteristics are not mandatory but dual-channel amplification, surface mount packaging, and supply voltage compatibility are required.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
OP285GS-REEL	Analog Devices	J-FET	22	9	100	35	9	44	-40 to 85	Obsolete
OP285GSZ-REEL	Analog Devices	J-FET	22	9	100	35	9	44	-40 to 85	Active
TL072CDT	STMicroelectronics	J-FET	16	4	0.02	3000	6	36	0 to 70	Active
ADA4075-2ARZ-RL	Analog Devices	General Purpose	12	6.5	30	200	9	36	-40 to 125	Active
LT1124CS8#TR	Analog Devices	General Purpose	4.5	12.5	7	25	8	44	0 to 70	Active
LME49860MAX/NOPB	Texas Instruments	Audio	20	55	10	140	5	44	-40 to 85	Active
MC4558CDT	STMicroelectronics	General Purpose	2.2	5.5	50	1000	4	40	0 to 70	Active
MC4558IDT	STMicroelectronics	General Purpose	2.2	5.5	50	1000	4	40	-40 to 105	Active
MC1458DT	STMicroelectronics	General Purpose	0.8	1	30	1000	5	30	0 to 70	Active
OPA2277MDTEP	Texas Instruments	General Purpose	0.8	1	0.5	20	4	36	-55 to 125	Active
TJM4558CDT	STMicroelectronics	General Purpose	2.2	5.5	50	1000	44	44	0 to 70	Active

Engineering Selection Recommendations

Primary Recommendation: OP285GSZ-REEL

The OP285GSZ-REEL is the direct functional equivalent of the OP285GS-REEL, providing identical electrical performance and J-FET amplifier architecture. The primary distinction is product status (Active versus Obsolete) and packaging format (Tape & Reel). This part carries ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. Selection of OP285GSZ-REEL ensures design continuity with no circuit modifications required and maintains long-term supply availability through active manufacturing channels.

Secondary Recommendation for J-FET Applications: TL072CDT

For applications where J-FET input characteristics are mandatory, the TL072CDT provides an alternative J-FET amplifier architecture. This part is manufactured by STMicroelectronics with Active product status and carries AEC-Q100 automotive qualification. The TL072CDT operates within the required supply voltage range (6V to 36V) and maintains the -40°C to 85°C operating temperature specification. Performance trade-offs include reduced slew rate (16V/µs versus 22V/µs) and lower gain bandwidth product (4 MHz versus 9 MHz). This part is suitable for applications with performance headroom or where J-FET input impedance characteristics are critical.

General-Purpose Alternatives for Flexible Applications

The ADA4075-2ARZ-RL, LT1124CS8#TR, MC4558CDT, MC4558IDT, LME49860MAX/NOPB, and OPA2277MDTEP provide dual-channel amplification in 8-SOIC packages with Active product status and full regulatory compliance (ROHS3, REACH Unaffected). These alternatives are suitable for applications where J-FET input characteristics are not essential but dual-channel amplification, surface mount packaging, and supply voltage compatibility are required. Each alternative exhibits distinct performance characteristics; selection depends on specific application requirements for slew rate, gain bandwidth product, input bias current, and operating temperature range.

Compliance and Availability Considerations

All recommended substitute parts carry ROHS3 compliance and REACH Unaffected status, ensuring compatibility with modern manufacturing and environmental regulations. Inventory availability is confirmed for all active alternatives, supporting immediate procurement and production deployment.

Frequently Asked Questions (FAQ)

Q: Can the OP285GSZ-REEL be used as a direct replacement for the OP285GS-REEL?

A: Yes. The OP285GSZ-REEL is functionally identical to the OP285GS-REEL, with identical electrical specifications, J-FET amplifier architecture, and 8-SOIC package format. The primary difference is product status (Active versus Obsolete) and packaging format (Tape & Reel). No circuit modifications are required for substitution.

Q: What is the key difference between J-FET and general-purpose amplifiers in this comparison?

A: J-FET amplifiers (OP285GS-REEL, OP285GSZ-REEL, TL072CDT) feature extremely low input bias current (measured in nanoamperes or picoamperes) and high input impedance, making them suitable for high-impedance signal sources and precision measurement applications. General-purpose amplifiers provide broader performance characteristics and lower cost but may exhibit higher input bias current. Selection depends on application requirements for input impedance and bias current specifications.

Q: Is the TL072CDT suitable as a replacement for the OP285GS-REEL?

A: The TL072CDT is suitable for applications where J-FET input characteristics are essential and performance headroom exists. Both parts are J-FET amplifiers in 8-SOIC packages with compatible supply voltage ranges. However, the TL072CDT exhibits lower slew rate (16V/µs versus 22V/µs) and reduced gain bandwidth product (4 MHz versus 9 MHz). Operating temperature range differs (0°C to 70°C versus -40°C to 85°C). Substitution requires verification that reduced performance specifications do not impact circuit operation.

Q: What are the supply voltage compatibility considerations?

A: The OP285GS-REEL operates across 9V to 44V. The OP285GSZ-REEL maintains identical supply specifications. The TL072CDT operates across 6V to 36V, requiring verification that the 44V maximum specification is not exceeded in the application. General-purpose alternatives exhibit varying supply ranges; specific verification is required for each candidate part.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts listed are available in 8-SOIC (0.154", 3.90mm Width) surface mount packages, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: What regulatory compliance certifications apply to substitute parts?

A: All active substitute parts carry ROHS3 compliance and REACH Unaffected status. The TL072CDT additionally carries AEC-Q100 automotive qualification. These certifications ensure compatibility with modern manufacturing standards and environmental regulations.

Q: How does input offset voltage affect substitution decisions?

A: The OP285GS-REEL specifies 35 µV input offset voltage. The OP285GSZ-REEL maintains this specification. The TL072CDT exhibits 3 mV (3000 µV) offset voltage, representing a 85-fold increase. General-purpose alternatives range from 20 µV to 1 mV. Applications requiring precision DC amplification or low-offset characteristics should prioritize parts with lower input offset voltage specifications.

Q: What is the significance of product status (Active versus Obsolete)?

A: Obsolete product status indicates that the manufacturer has discontinued production and support. Active product status confirms ongoing manufacturing, quality assurance, and supply chain availability. Substitution to active parts ensures long-term design support and eliminates supply chain risk associated with end-of-life components.

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