OP27CH Equivalent & Substitute Parts

Part Overview

The OP27CH is a general-purpose operational amplifier manufactured by Analog Devices Inc., housed in a TO-5-8 metal can package for through-hole mounting. This device is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited. The OP27CH delivers high-speed performance with a gain-bandwidth product of 8 MHz and low input offset voltage of 30 µV, making it suitable for precision analog signal processing applications. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for legacy systems or new designs requiring comparable performance characteristics.

Key Parameters

Parameter	OP27CH Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	2.8	V/µs
Gain Bandwidth Product	8	MHz
Current - Input Bias	15	nA
Voltage - Input Offset	30	µV
Voltage - Supply Span (Min)	8	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-55 to 125	°C
Mounting Type	Through Hole	—
Package / Case	TO-205-8, TO-5-8 Metal Can	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the OP27CH is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Amplifier type (general purpose)
Number of circuits (single circuit)
Supply voltage range (minimum 8 V, maximum 36 V)
Operating temperature range (-55°C to 125°C)
Through-hole mounting capability

Performance Considerations: Substitute parts must maintain functional equivalence in slew rate, gain-bandwidth product, input bias current, and input offset voltage. Parts with superior performance characteristics (higher slew rate, higher gain-bandwidth product, lower input bias current, lower input offset voltage) are electrically compatible and may be used as direct replacements. Parts with degraded performance characteristics require application-specific evaluation.

Package Considerations: The OP27CH uses TO-5-8 metal can packaging. Substitute parts in TO-99-8 metal can packaging are mechanically compatible through standard PCB footprint adaptation, as both are through-hole metal can packages with equivalent pin configurations for single-circuit operational amplifiers.

Parameter Comparison

Parameter	OP27CH	OP27GJZ	LM741CH	LM741CH/NOPB	LM741H	LM741H/NOPB	Unit
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments	—
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	—
Number of Circuits	1	1	1	1	1	1	—
Slew Rate	2.8	2.8	0.5	0.5	0.5	0.5	V/µs
Gain Bandwidth Product	8	8	1.5	1.5	1.5	1.5	MHz
Current - Input Bias	15	15	80	80	80	80	nA
Voltage - Input Offset	30	30	2000	2000	1000	1000	µV
Voltage - Supply Span (Min)	8	8	10	10	10	10	V
Voltage - Supply Span (Max)	36	36	36	36	44	44	V
Operating Temperature	-55 to 125	-40 to 85	0 to 70	0 to 70	-55 to 125	-55 to 125	°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-5-8	TO-99-8	TO-99-8	TO-99-8	TO-99-8	TO-99-8	—
Product Status	Obsolete	Active	Active	Active	Active	Active	—

Engineering Selection Recommendations

Primary Substitute: OP27GJZ

The OP27GJZ is the recommended substitute for the OP27CH. Both devices are manufactured by Analog Devices Inc. and share identical electrical specifications: 2.8 V/µs slew rate, 8 MHz gain-bandwidth product, 15 nA input bias current, and 30 µV input offset voltage. The OP27GJZ is housed in a TO-99-8 metal can package, which is mechanically compatible with the OP27CH through standard PCB footprint adaptation. The OP27GJZ maintains active product status, ensuring continued availability and supply chain reliability. The operating temperature range of the OP27GJZ (-40°C to 85°C) is narrower than the OP27CH (-55°C to 125°C); applications requiring the full military temperature range must account for this limitation.

Secondary Substitutes: LM741H and LM741H/NOPB

The LM741H and LM741H/NOPB are manufactured by Texas Instruments and provide electrical compatibility with extended operating temperature range (-55°C to 125°C) matching the OP27CH. Both devices support the full supply voltage range of the OP27CH (10 V to 44 V maximum). However, these devices exhibit degraded performance characteristics: 0.5 V/µs slew rate (versus 2.8 V/µs), 1.5 MHz gain-bandwidth product (versus 8 MHz), 80 nA input bias current (versus 15 nA), and 1000 µV input offset voltage (versus 30 µV). These parts are suitable for applications where the OP27CH's performance specifications exceed system requirements. Both LM741H variants are active products with RoHS3 compliance.

Tertiary Substitutes: LM741CH and LM741CH/NOPB

The LM741CH (Texas Instruments) and LM741CH/NOPB (National Semiconductor) provide electrical compatibility with identical performance characteristics to the LM741H variants. The operating temperature range is restricted to 0°C to 70°C, limiting applicability to commercial-grade systems. These parts are suitable only for applications operating within this narrower temperature window.

Frequently Asked Questions (FAQ)

Q: Can the OP27GJZ directly replace the OP27CH without PCB modifications?

A: The OP27GJZ uses TO-99-8 packaging while the OP27CH uses TO-5-8 packaging. Both are through-hole metal can packages with equivalent pin configurations for single-circuit operational amplifiers. Standard PCB footprint adaptation is required; direct socket substitution is not possible without mechanical modification.

Q: What are the performance trade-offs when substituting the OP27CH with LM741H or LM741H/NOPB?

A: The LM741H variants provide extended operating temperature range (-55°C to 125°C) matching the OP27CH. However, performance is degraded: slew rate decreases from 2.8 V/µs to 0.5 V/µs, gain-bandwidth product decreases from 8 MHz to 1.5 MHz, input bias current increases from 15 nA to 80 nA, and input offset voltage increases from 30 µV to 1000 µV. These substitutes are suitable only for applications where the OP27CH's performance specifications exceed system requirements.

Q: Is the OP27GJZ suitable for applications requiring the full -55°C to 125°C operating temperature range?

A: The OP27GJZ operating temperature range is -40°C to 85°C, which does not cover the full military temperature range of the OP27CH. Applications requiring operation below -40°C or above 85°C must use alternative substitutes such as LM741H or LM741H/NOPB, accepting the associated performance trade-offs.

Q: What compliance certifications should be considered when selecting a substitute?

A: The OP27GJZ is RoHS3 compliant and REACH unaffected. The LM741H and LM741H/NOPB are RoHS3 compliant and REACH unaffected. The LM741CH/NOPB is not listed with RoHS status. Applications subject to RoHS or REACH regulations should prioritize OP27GJZ, LM741H, or LM741H/NOPB.

Q: Are all substitute parts available in the same packaging options?

A: No. The OP27CH is available in TO-5-8 metal can packaging. All substitute parts listed are available in TO-99-8 metal can packaging. Both package types are through-hole metal cans with equivalent pin configurations; PCB footprint adaptation is required for substitution.

Q: What is the inventory status of substitute parts?

A: OP27GJZ: 2156 units in stock. LM741CH: 1832 units in stock. LM741CH/NOPB: 1180 units in stock. LM741H: 2282 units in stock. LM741H/NOPB: 4095 units in stock. All substitute parts maintain active product status with established supply chains.

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