OP27EH Equivalent & Substitute Parts

Part Overview

The OP27EH 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 may be limited. The OP27EH delivers superior performance characteristics including a slew rate of 2.8 V/µs and gain bandwidth product of 8 MHz, making it suitable for precision analog signal processing applications. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain component availability for production and maintenance applications.

Key Parameters

Parameter	OP27EH Value
Amplifier Type	General Purpose
Number of Circuits	1
Slew Rate	2.8 V/µs
Gain Bandwidth Product	8 MHz
Current - Input Bias	10 nA
Voltage - Input Offset	10 µV
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-25°C ~ 85°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 OP27EH is determined by compatibility across the following critical parameters: amplifier type (general purpose), number of circuits (1), through-hole mounting capability, metal can package format, and supply voltage range overlap. The substitute parts identified—LM741CH, LM741CH/NOPB, LM741H, and LM741H/NOPB—all share the same amplifier classification and circuit count. These devices are housed in TO-99-8 metal can packages, which are mechanically compatible with TO-5-8 footprints in through-hole applications. All substitute parts operate within the OP27EH's supply voltage range of 8 V to 36 V minimum and maximum specifications. However, substitute parts exhibit reduced performance in slew rate (0.5 V/µs versus 2.8 V/µs) and gain bandwidth product (1.5 MHz versus 8 MHz), indicating they are suitable only for applications where these performance metrics are not critical design constraints.

Parameter Comparison

Parameter	OP27EH	LM741CH	LM741CH/NOPB	LM741H	LM741H/NOPB
Manufacturer	Analog Devices Inc.	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1
Slew Rate	2.8 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs
Gain Bandwidth Product	8 MHz	1.5 MHz	1.5 MHz	1.5 MHz	1.5 MHz
Current - Input Bias	10 nA	80 nA	80 nA	80 nA	80 nA
Voltage - Input Offset	10 µV	2 mV	2 mV	1 mV	1 mV
Current - Supply	Not specified	1.7 mA	1.7 mA	1.7 mA	1.7 mA
Voltage - Supply Span (Min)	8 V	10 V	10 V	10 V	10 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	44 V	44 V
Operating Temperature	-25°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-5-8 Metal Can	TO-99-8 Metal Can	TO-99-8 Metal Can	TO-99-8 Metal Can	TO-99-8 Metal Can
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four substitute parts—LM741CH, LM741CH/NOPB, LM741H, and LM741H/NOPB—are active products with current manufacturing status, providing superior long-term availability compared to the obsolete OP27EH. The LM741H and LM741H/NOPB variants from Texas Instruments offer extended operating temperature range (-55°C ~ 125°C) and higher maximum supply voltage (44 V), providing broader application flexibility. Both LM741H variants carry ROHS3 compliance certification and REACH unaffected status, meeting modern environmental and regulatory requirements. The LM741CH and LM741CH/NOPB variants operate within a narrower temperature range (0°C ~ 70°C) and maximum supply voltage (36 V), matching the OP27EH's upper supply limit. LM741CH/NOPB and LM741H/NOPB include lead-free packaging designation (NOPB suffix), supporting RoHS compliance mandates. Selection between these substitutes depends on application temperature requirements and supply voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can the LM741 series parts directly replace the OP27EH in all applications?

A: Direct replacement is limited to applications where reduced slew rate (0.5 V/µs versus 2.8 V/µs) and lower gain bandwidth product (1.5 MHz versus 8 MHz) are acceptable. The OP27EH's superior performance characteristics make it unsuitable for high-speed signal processing applications. Verify that your circuit design does not depend on the OP27EH's higher slew rate or bandwidth specifications before substitution.

Q: Are the TO-99-8 and TO-5-8 packages mechanically interchangeable?

A: Both TO-99-8 and TO-5-8 are metal can packages with through-hole mounting. Pin configurations and lead spacing are compatible for standard through-hole PCB layouts. Physical package dimensions differ slightly, but both fit standard 8-pin DIP sockets and breadboard configurations.

Q: What is the significance of the NOPB suffix in part numbers LM741CH/NOPB and LM741H/NOPB?

A: The NOPB suffix indicates "No Plumbum" (lead-free) packaging, signifying compliance with RoHS (Restriction of Hazardous Substances) directives. These variants are suitable for applications requiring environmental compliance certification.

Q: Which substitute part offers the widest operating temperature range?

A: LM741H and LM741H/NOPB both provide an operating temperature range of -55°C ~ 125°C, compared to the OP27EH's -25°C ~ 85°C range. These variants are suitable for extreme temperature applications.

Q: What is the minimum supply voltage requirement for LM741 substitutes?

A: All LM741 variants require a minimum supply voltage of 10 V, compared to the OP27EH's 8 V minimum. Circuits designed for 8 V to 10 V operation require design modification or alternative substitutes.

Q: Are all substitute parts currently in active production?

A: Yes, all four substitute parts—LM741CH, LM741CH/NOPB, LM741H, and LM741H/NOPB—carry active product status, ensuring reliable long-term availability and supply chain continuity.

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