OP37EH Equivalent & Substitute Parts

Part Overview

The OP37EH 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, making equivalent substitute parts necessary for ongoing design support and component procurement. The OP37EH delivers high-performance characteristics including a 63 MHz gain bandwidth product and 17 V/µs slew rate, suitable for applications requiring superior speed and precision compared to legacy general purpose amplifier designs.

Key Parameters

Parameter	OP37EH Value
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	1
Slew Rate	17 V/µs
Gain Bandwidth Product	63 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OP37EH requires evaluation based on the following critical parameters: amplifier type (general purpose), number of circuits (1), mounting type (through hole), package style (metal can), and electrical performance specifications including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply voltage range.

The substitute parts listed below are classified as general purpose operational amplifiers in metal can packages suitable for through-hole mounting. However, the substitute parts exhibit significantly reduced electrical performance compared to the OP37EH. The LM741 series devices (LM741CH, LM741H, LM741CH/NOPB, LM741H/NOPB) operate with a slew rate of 0.5 V/µs and gain bandwidth product of 1.5 MHz, representing a substantial reduction from the OP37EH specifications of 17 V/µs and 63 MHz respectively.

Substitution is permissible only when application requirements can tolerate these reduced performance characteristics. The key differentiating parameters for selection among substitute parts are: product status (active versus obsolete), operating temperature range, supply voltage span maximum, and compliance certifications (RoHS, REACH).

Parameter Comparison

Parameter	OP37EH	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	17 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs
Gain Bandwidth Product	63 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Selection among substitute parts must account for product status and compliance requirements. All four substitute parts (LM741CH, LM741CH/NOPB, LM741H, LM741H/NOPB) are classified as active products, ensuring ongoing availability and manufacturing support compared to the obsolete OP37EH.

For applications requiring extended operating temperature range, LM741H and LM741H/NOPB provide -55°C to 125°C operation, exceeding the OP37EH range of -25°C to 85°C. LM741CH and LM741CH/NOPB operate within 0°C to 70°C, which is narrower than the OP37EH specification.

For applications requiring higher supply voltage capability, LM741H and LM741H/NOPB support maximum supply voltage of 44 V compared to 36 V for the OP37EH and LM741CH variants.

LM741H/NOPB offers the broadest compliance profile, with RoHS3 compliance and REACH Unaffected status. LM741CH/NOPB provides RoHS3 compliance but is REACH Affected. LM741H carries RoHS3 compliance and REACH Unaffected status. LM741CH carries RoHS3 compliance and REACH Affected status.

All substitute parts maintain the same moisture sensitivity level (MSL 1, Unlimited) as the OP37EH, ensuring equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM741 series directly replace the OP37EH in existing designs?

A: Direct replacement requires verification that application performance requirements tolerate the reduced electrical specifications. The LM741 series exhibits 34 times lower slew rate (0.5 V/µs versus 17 V/µs) and 42 times lower gain bandwidth product (1.5 MHz versus 63 MHz). Applications sensitive to signal rise time, settling time, or bandwidth must be re-evaluated.

Q: What are the package differences between OP37EH and substitute parts?

A: The OP37EH uses TO-5-8 metal can packaging, while all substitute parts use TO-99-8 metal can packaging. Both are through-hole mount metal can packages with 8 pins. Physical dimensions and pin spacing differ between TO-5 and TO-99 packages, requiring PCB layout modification for substitution.

Q: Which substitute part offers the best compliance profile?

A: LM741H and LM741H/NOPB both provide RoHS3 compliance and REACH Unaffected status. LM741H/NOPB additionally includes the /NOPB designation indicating lead-free plating. Selection between these two depends on specific procurement and environmental compliance requirements.

Q: Are there temperature range limitations when substituting?

A: LM741CH and LM741CH/NOPB operate only within 0°C to 70°C, which is narrower than the OP37EH range of -25°C to 85°C. Applications requiring operation below 0°C or above 70°C must use LM741H or LM741H/NOPB, which support -55°C to 125°C operation.

Q: What is the impact of higher input bias current in substitute parts?

A: The LM741 series exhibits 80 nA input bias current compared to 10 nA for the OP37EH, representing an 8-fold increase. Applications with high source impedance or precision transimpedance configurations may experience increased offset drift and noise. Circuit design verification is necessary.

Q: Do all substitute parts have the same supply voltage range?

A: LM741CH and LM741CH/NOPB support 10 V to 36 V supply range. LM741H and LM741H/NOPB support 10 V to 44 V supply range. The OP37EH supports 8 V to 36 V. Applications requiring operation below 10 V cannot use any substitute part without circuit modification.

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