OP285GS-REEL7 Equivalent & Substitute Parts

Part Overview

The OP285GS-REEL7 is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-circuit device in 8-SOIC surface mount packaging. This component is classified as obsolete, indicating discontinued production and limited availability. The OP285GS-REEL7 serves applications requiring low input bias current and low input offset voltage characteristics inherent to J-FET amplifier topology. Due to obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance.

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 Range	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the OP285GS-REEL7 is determined by compatibility across the following critical parameters: amplifier type (J-FET vs. general purpose), number of circuits (dual configuration), package type (8-SOIC surface mount), supply voltage range (9V to 44V minimum), and operating temperature range (-40°C to 85°C minimum).

Substitute parts are grouped into two categories:

Direct Equivalent: OP285GSZ-REEL7 maintains identical electrical specifications and J-FET amplifier topology, differing only in packaging format (Cut Tape & Digi-Reel® versus Reel format) and product status (Active versus Obsolete).

Functional Equivalents: Parts including ISL28210FBZ-T13, ADA4075-2ARZ-R7, LT1124CS8#TR, LME49860MAX/NOPB, MC4558CDT, MC4558IDT, MC1458DT, OPA2277MDTEP, and TJM4558CDT share the 8-SOIC package, dual-circuit configuration, and surface mount technology. These parts operate within overlapping supply voltage ranges and temperature specifications. Functional equivalents may differ in amplifier type (general purpose or audio versus J-FET), slew rate, gain bandwidth product, input bias current, and input offset voltage. Selection depends on application-specific performance requirements and compliance certifications.

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-REEL7	Analog Devices	J-FET	22	9	100	35	9	44	-40 to 85	Obsolete
OP285GSZ-REEL7	Analog Devices	J-FET	22	9	100	35	9	44	-40 to 85	Active
ISL28210FBZ-T13	Renesas Electronics	J-FET	20	12.5	0.3 pA	300	9	40	-40 to 125	Active
ADA4075-2ARZ-R7	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

Direct Replacement: OP285GSZ-REEL7 is the primary direct equivalent for OP285GS-REEL7. Both parts maintain identical electrical performance specifications and J-FET amplifier topology. OP285GSZ-REEL7 carries Active product status and ROHS3 compliance certification, providing long-term availability and regulatory alignment. The packaging difference (Cut Tape & Digi-Reel® format) does not affect electrical compatibility or functional performance.

J-FET Amplifier Alternatives: ISL28210FBZ-T13 (Renesas Electronics) provides J-FET amplifier topology with enhanced specifications including higher gain bandwidth product (12.5 MHz versus 9 MHz), superior input bias current (0.3 pA versus 100 nA), and extended operating temperature range (-40°C to 125°C). ISL28210FBZ-T13 is Active status with ROHS3 and REACH compliance. Supply voltage maximum is reduced to 40V, requiring verification against application requirements.

General Purpose Amplifier Alternatives: MC4558CDT, MC4558IDT, and TJM4558CDT (STMicroelectronics) offer general purpose amplifier topology in 8-SOIC packaging with Active product status and ROHS3 compliance. MC4558IDT extends operating temperature to -40°C to 105°C. These parts operate within the 4V to 40V supply range and provide dual-circuit configuration. Input bias current (50 nA) and input offset voltage (1 mV) differ from the OP285GS-REEL7 specification.

Extended Temperature Range Options: ADA4075-2ARZ-R7 (Analog Devices, iPolar® series) and OPA2277MDTEP (Texas Instruments) provide operating temperature ranges extending to 125°C. Both maintain 8-SOIC packaging and dual-circuit configuration with Active status and ROHS3 compliance. ADA4075-2ARZ-R7 operates within 9V to 36V supply range. OPA2277MDTEP operates within 4V to 36V supply range with extended low-temperature capability (-55°C).

Audio Application Variant: LME49860MAX/NOPB (Texas Instruments, LME® series) provides audio amplifier topology with significantly higher gain bandwidth product (55 MHz) and Active product status with ROHS3 compliance. Supply range extends to 5V minimum, supporting lower voltage applications. This part is suitable for audio-specific applications requiring enhanced frequency response.

All substitute parts listed maintain 8-SOIC surface mount packaging, dual-circuit configuration, and MSL 1 or MSL 2 moisture sensitivity ratings. Selection should be based on specific application requirements for slew rate, gain bandwidth product, input bias current, input offset voltage, supply voltage range, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can OP285GSZ-REEL7 directly replace OP285GS-REEL7 in existing designs?

A: Yes. OP285GSZ-REEL7 maintains identical electrical specifications, J-FET amplifier topology, and 8-SOIC package dimensions. The only difference is packaging format (Cut Tape & Digi-Reel® versus Reel) and product status (Active versus Obsolete). No circuit modifications are required.

Q: What is the primary difference between J-FET and general purpose amplifier substitutes?

A: J-FET amplifiers (OP285GS-REEL7, OP285GSZ-REEL7, ISL28210FBZ-T13) feature extremely low input bias current (100 nA to 0.3 pA) and low input offset voltage (35 µV to 300 µV), making them suitable for high-impedance input applications. General purpose amplifiers (MC4558CDT, MC4558IDT, ADA4075-2ARZ-R7) have higher input bias current (30 nA to 50 nA) and input offset voltage (200 µV to 1 mV), but offer lower supply current and broader availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. OP285GS-REEL7 (obsolete) does not specify RoHS status, but OP285GSZ-REEL7 and all functional equivalents are ROHS3 compliant.

Q: What supply voltage range must be verified when selecting a substitute?

A: The OP285GS-REEL7 operates from 9V to 44V. Substitute parts have varying supply ranges: ISL28210FBZ-T13 (9V to 40V), ADA4075-2ARZ-R7 (9V to 36V), MC4558CDT/MC4558IDT (4V to 40V), LT1124CS8#TR (8V to 44V), LME49860MAX/NOPB (5V to 44V), OPA2277MDTEP (4V to 36V). Application circuits must operate within the selected substitute's supply voltage specification.

Q: Which substitute provides the best low-frequency performance match?

A: OP285GSZ-REEL7 provides identical performance with 9 MHz gain bandwidth product. For applications requiring lower slew rate and gain bandwidth product, MC1458DT (1 MHz) and OPA2277MDTEP (1 MHz) are available, though these represent significant performance reduction.

Q: Can ISL28210FBZ-T13 replace OP285GS-REEL7 in all applications?

A: ISL28210FBZ-T13 maintains J-FET amplifier topology with superior input bias current (0.3 pA) and higher gain bandwidth product (12.5 MHz). However, maximum supply voltage is 40V versus 44V for the OP285GS-REEL7. Applications requiring operation above 40V supply voltage cannot use ISL28210FBZ-T13.

Q: What is the moisture sensitivity level (MSL) difference between parts?

A: OP285GS-REEL7 and most substitutes carry MSL 1 (Unlimited shelf life). ISL28210FBZ-T13 carries MSL 2 (1 Year shelf life), requiring controlled storage conditions. OPA2277MDTEP carries MSL 3 (168 Hours shelf life), requiring more stringent moisture control during storage and handling.

Q: Are there supply chain advantages to selecting specific substitutes?

A: Yes. MC4558IDT (119,399 pcs in stock) and TJM4558CDT (555,138 pcs in stock) offer significantly higher inventory availability. OP285GSZ-REEL7 (3,880 pcs) and LME49860MAX/NOPB (3,008 pcs) provide moderate availability. ISL28210FBZ-T13 (679 pcs) has limited inventory. Inventory levels should be verified with suppliers for production planning.

Q: What operating temperature range should be verified for extended temperature applications?

A: OP285GS-REEL7 operates from -40°C to 85°C. For extended high-temperature operation, MC4558IDT (-40°C to 105°C), ADA4075-2ARZ-R7 (-40°C to 125°C), ISL28210FBZ-T13 (-40°C to 125°C), and OPA2277MDTEP (-55°C to 125°C) provide broader temperature ranges. MC1458DT and MC4558CDT are limited to 0°C to 70°C.

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