OP285GSZ-REEL Equivalent & Substitute Parts

Part Overview

The OP285GSZ-REEL is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This component is classified as a linear amplifier and is currently in active product status with 3700 units in stock. The OP285GSZ-REEL is designed for applications requiring low input bias current and low input offset voltage characteristics inherent to J-FET amplifier topology.

Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and operational specifications. Substitution becomes necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements permit operation within the electrical tolerances of alternative amplifier architectures.

Key Parameters

Parameter	OP285GSZ-REEL Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
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
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the OP285GSZ-REEL is determined by the following critical parameters:

Package Compatibility: All substitute parts must be housed in an 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Circuit Count: The dual-channel (2 circuit) configuration is mandatory for direct substitution without redesign.

Amplifier Architecture: The OP285GSZ-REEL employs J-FET input topology, characterized by extremely low input bias current (100 nA) and low input offset voltage (35 µV). Substitutes may employ alternative architectures (General Purpose, Audio) provided they operate within the electrical performance envelope required by the application.

Electrical Performance Envelope: Substitutes must satisfy minimum requirements for slew rate (22 V/µs), gain bandwidth product (9 MHz), input bias current (100 nA maximum), and input offset voltage (35 µV maximum) to maintain circuit functionality.

Supply Voltage Range: The OP285GSZ-REEL operates across 9 V to 44 V. Substitute parts must support this range or a compatible subset that includes the application's operating voltage.

Temperature Range: Operating temperature range of -40°C to 85°C establishes the baseline thermal specification. Substitutes with extended or equivalent temperature ranges are acceptable.

Compliance & Certification: All substitute parts must maintain ROHS3 compliance and MSL rating compatibility with the original component.

Parameter Comparison

Parameter	OP285GSZ-REEL	ADA4075-2ARZ-RL	LME49860MAX/NOPB	MC1458DT	MC4558CDT	MC4558IDT	OPA2227UAG4	OPA2277MDTEP	TJM4558CDT	TL072CDT
Amplifier Type	J-FET	General Purpose	Audio	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	J-FET
Number of Circuits	2	2	2	2	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Slew Rate (V/µs)	22	12	20	0.8	2.2	2.2	2.3	0.8	2.2	16
Gain Bandwidth Product (MHz)	9	6.5	55	1	5.5	5.5	8	1	5.5	4
Current - Input Bias (nA)	100	30	10	30	50	50	2.5	0.5	50	0.02
Voltage - Input Offset (µV)	35	200	140	1000	1000	1000	10	20	1000	3000
Current - Supply (mA)	4	1.8	10.5	2.3	2.3	2.3	3.7	0.79	2.3	1.4
Voltage - Supply Span Min (V)	9	9	5	5	4	4	5	4	44	6
Voltage - Supply Span Max (V)	44	36	44	30	40	40	36	36	44	36
Operating Temperature (°C)	-40 to 85	-40 to 125	-40 to 85	0 to 70	0 to 70	-40 to 105	-40 to 85	-55 to 125	0 to 70	0 to 70
Product Status	Active	Active	Active	Active	Active	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1	1	1	1	1	1	3	3	1	1

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

TL072CDT represents the closest functional equivalent to the OP285GSZ-REEL. Both components employ J-FET input architecture, operate across overlapping supply voltage ranges (6 V to 36 V for TL072CDT versus 9 V to 44 V for OP285GSZ-REEL), and share identical package specifications. The TL072CDT exhibits lower input bias current (20 pA versus 100 nA) and maintains active product status with high inventory availability (203,200 units). Operating temperature range for TL072CDT is 0°C to 70°C, which is narrower than the OP285GSZ-REEL specification. The TL072CDT carries AEC-Q100 automotive qualification and ROHS3 compliance.

Secondary Substitutes (Conditional Compatibility):

ADA4075-2ARZ-RL (Analog Devices Inc.) provides general-purpose amplification with dual-channel configuration in 8-SOIC packaging. This part operates across 9 V to 36 V supply range and maintains active product status with 7,050 units in stock. Input bias current (30 nA) and input offset voltage (200 µV) exceed the OP285GSZ-REEL specifications, but remain within acceptable ranges for many applications. Extended operating temperature range (-40°C to 125°C) provides thermal margin beyond the original component.

LME49860MAX/NOPB (Texas Instruments) is an audio-grade amplifier with superior gain bandwidth product (55 MHz) and slew rate (20 V/µs) characteristics. This part operates across 5 V to 44 V supply range, matching the upper voltage limit of the OP285GSZ-REEL. Input bias current (10 nA) is significantly lower than the original specification. Higher supply current (10.5 mA per channel) may impact power budget in current-limited applications. Product status is active with 3,008 units available.

MC4558IDT (STMicroelectronics) offers general-purpose amplification with extended operating temperature range (-40°C to 105°C). Supply voltage range (4 V to 40 V) encompasses the OP285GSZ-REEL specification. Slew rate (2.2 V/µs) and gain bandwidth product (5.5 MHz) are reduced compared to the original component. Input bias current (50 nA) and input offset voltage (1 mV) represent acceptable trade-offs for cost-sensitive applications. Inventory availability is substantial (119,399 units).

Tertiary Substitutes (Limited Compatibility):

MC4558CDT and TJM4558CDT provide general-purpose amplification in 8-SOIC packaging with similar electrical characteristics to MC4558IDT. Operating temperature range for both parts is restricted to 0°C to 70°C. MC4558CDT supports supply voltage range of 4 V to 40 V, while TJM4558CDT exhibits a fixed supply voltage specification of 44 V. These parts are suitable for applications operating within the 0°C to 70°C temperature window.

MC1458DT represents a legacy general-purpose amplifier with significantly reduced performance specifications. Slew rate (0.8 V/µs) and gain bandwidth product (1 MHz) are substantially lower than the OP285GSZ-REEL. Operating temperature range (0°C to 70°C) and supply voltage range (5 V to 30 V) are restricted. This part is appropriate only for low-frequency applications with relaxed performance requirements.

OPA2227UAG4 (Texas Instruments) is classified as obsolete product status, limiting its suitability for new designs. Electrical specifications are favorable (input bias current 2.5 nA, input offset voltage 10 µV), but obsolescence status and MSL rating of 3 (168 hours) present supply chain and manufacturing process risks.

OPA2277MDTEP (Texas Instruments) provides ultra-low supply current (790 µA per channel) and extended operating temperature range (-55°C to 125°C). Slew rate (0.8 V/µs) and gain bandwidth product (1 MHz) are substantially reduced, limiting applicability to low-frequency signal conditioning. MSL rating of 3 (168 hours) requires controlled moisture exposure during assembly.

Compliance & Certification Summary:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the OP285GSZ-REEL. Moisture sensitivity levels are predominantly MSL 1 (unlimited), with exceptions noted for OPA2227UAG4 and OPA2277MDTEP (MSL 3, 168 hours). The TL072CDT carries AEC-Q100 automotive qualification, providing additional reliability assurance for mission-critical applications.

Frequently Asked Questions (FAQ)

Q: Can the TL072CDT directly replace the OP285GSZ-REEL in all applications?

A: The TL072CDT is mechanically and electrically compatible with the OP285GSZ-REEL in 8-SOIC package format and shares J-FET input architecture. However, the TL072CDT operating temperature range (0°C to 70°C) is narrower than the OP285GSZ-REEL (-40°C to 85°C). Applications requiring operation below 0°C or above 70°C require alternative substitutes or thermal management verification.

Q: What is the primary difference between J-FET and General Purpose amplifier types?

A: J-FET input amplifiers (OP285GSZ-REEL, TL072CDT) exhibit extremely low input bias current (measured in nanoamperes to picoamperes) and low input offset voltage, making them suitable for high-impedance signal sources and precision measurement applications. General Purpose amplifiers (ADA4075-2ARZ-RL, MC4558 series) employ bipolar input stages with higher input bias current but often provide superior slew rate and bandwidth characteristics for audio and signal processing applications.

Q: Is the ADA4075-2ARZ-RL suitable for applications requiring the OP285GSZ-REEL's low input bias current specification?

A: The ADA4075-2ARZ-RL input bias current (30 nA) is approximately 3.3 times higher than the OP285GSZ-REEL (100 nA). For applications with input impedance below 1 MΩ, this difference is negligible. For high-impedance applications (>10 MΩ), the increased input bias current may introduce unacceptable offset errors. Verification through circuit simulation or prototype testing is required for marginal cases.

Q: Why is the OPA2227UAG4 listed as a substitute if it is obsolete?

A: The OPA2227UAG4 is included in the substitute list based on the provided input parameters, which identified it as a substitute for the OP285GSZ-REEL. However, obsolete product status indicates that this part is no longer manufactured and existing inventory is limited. New designs should not incorporate obsolete parts. Existing designs currently using OPA2227UAG4 may transition to active alternatives such as OPA2277MDTEP or TL072CDT.

Q: What is the significance of Moisture Sensitivity Level (MSL) rating?

A: MSL rating defines the maximum time a component can be exposed to ambient moisture (typically 30°C, 85% relative humidity) before assembly without baking. MSL 1 (unlimited) components require no moisture control. MSL 3 (168 hours) components such as OPA2227UAG4 and OPA2277MDTEP must be baked at 125°C for 24 hours if exposed to moisture for more than 168 hours. This impacts manufacturing logistics and assembly procedures.

Q: Can the LME49860MAX/NOPB be used in applications requiring the OP285GSZ-REEL's 9 V minimum supply voltage?

A: The LME49860MAX/NOPB minimum supply voltage is 5 V, which is lower than the OP285GSZ-REEL specification of 9 V. This part can operate at 9 V and above. However, the LME49860MAX/NOPB is optimized for audio applications and exhibits higher supply current (10.5 mA per channel) compared to the OP285GSZ-REEL (4 mA). Power budget verification is required for battery-powered or current-limited applications.

Q: What is the impact of reduced slew rate in substitute parts such as MC1458DT?

A: Slew rate defines the maximum rate of change of output voltage per unit time. The OP285GSZ-REEL slew rate is 22 V/µs, while MC1458DT is 0.8 V/µs. For a 10 V output swing, the OP285GSZ-REEL requires 0.45 µs minimum, while MC1458DT requires 12.5 µs. Applications requiring fast transient response, high-frequency signal conditioning, or audio reproduction benefit from higher slew rate. Low-frequency measurement and control applications are unaffected by reduced slew rate.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: The OP285GSZ-REEL is supplied in Tape & Reel packaging. Substitute parts are supplied in various packaging formats: ADA4075-2ARZ-RL (Tape & Reel), LME49860MAX/NOPB (Cut Tape & Digi-Reel), MC1458DT through TJM4558CDT (Cut Tape & Digi-Reel), OPA2227UAG4 (Tube), OPA2277MDTEP (packaging not specified), and TL072CDT (Cut Tape & Digi-Reel). Packaging format affects component handling, storage, and automated assembly compatibility. Verify packaging compatibility with manufacturing processes before design implementation.

Q: What supply voltage range is common to all substitute parts and the OP285GSZ-REEL?

A: The OP285GSZ-REEL operates across 9 V to 44 V. Examining all substitute parts, the common supply voltage range is 9 V to 36 V. Applications requiring operation above 36 V are limited to OP285GSZ-REEL, LME49860MAX/NOPB (5 V to 44 V), MC4558CDT (4 V to 40 V), MC4558IDT (4 V to 40 V), and TJM4558CDT (44 V fixed). Applications requiring operation below 9 V are limited to LME49860MAX/NOPB, MC1458DT, MC4558CDT, MC4558IDT, OPA2227UAG4, OPA2277MDTEP, and TL072CDT.

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