MAX437CPA Equivalent & Substitute Parts Reference

Part Overview

The MAX437CPA is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-DIP package for through-hole mounting. This device features a single amplifier circuit with a 60 MHz gain-bandwidth product and 17 V/µs slew rate, designed for general-purpose signal conditioning and amplification applications.

The MAX437CPA is classified as obsolete. Due to its discontinued status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	17	V/µs
Gain Bandwidth Product	60	MHz
Current - Input Bias	10	nA
Voltage - Input Offset	5	µV
Operating Temperature Range	-40°C to 85°C	—
Mounting Type	Through Hole	—
Package / Case	8-DIP (0.300", 7.62mm)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the MAX437CPA are selected based on strict compatibility criteria derived from the provided electrical and mechanical parameters. The substitution logic is organized into the following categories:

Primary Substitution Criteria:

Package compatibility: 8-DIP (0.300", 7.62mm) through-hole mounting
Amplifier type: General-purpose single-circuit configuration
Electrical performance envelope: Slew rate, gain-bandwidth product, input bias current, and input offset voltage

Grouping Logic:

Group 1: High-Speed General-Purpose Amplifiers (Slew Rate ≥ 300 V/µs) Parts AD847JNZ and AD848JNZ feature significantly higher slew rates (300 V/µs) compared to the MAX437CPA (17 V/µs). These are suitable for applications requiring faster transient response. AD848JNZ additionally provides higher gain-bandwidth product (175 MHz vs. 50 MHz in AD847JNZ).

Group 2: Low-Offset, Low-Bias-Current Amplifiers (Input Bias ≤ 1.8 nA) Parts OP07CPZ and OP07EPZ are precision amplifiers with exceptionally low input bias currents (1.8 nA and 1.2 nA respectively) and low input offset voltages (60 µV and 30 µV). These are suitable for precision measurement and low-noise applications. OP07EPZ operates at 0°C to 70°C, while OP07CPZ extends to -40°C to 85°C.

Group 3: Precision Low-Offset Amplifiers (Input Offset ≤ 10 µV) Parts OP27EPZ and OP27GPZ feature low input offset voltages (10 µV and 30 µV respectively) with moderate slew rates (2.8 V/µs) and 8 MHz gain-bandwidth product. OP27GPZ operates across the full industrial temperature range (-40°C to 85°C), matching the MAX437CPA.

Group 4: High-Precision Wideband Amplifiers (Input Offset ≤ 10 µV, Slew Rate ≥ 11 V/µs) Parts OPA228P and OPA228PA are high-precision amplifiers manufactured by Burr Brown with 11 V/µs slew rate, 33 MHz gain-bandwidth product, and low input offset voltages (5 µV and 10 µV). Both operate across -40°C to 85°C.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Temp Range (°C)	RoHS Status
MAX437CPA	Analog Devices/Maxim	Obsolete	17	60	10	5	-40 to 85	Non-compliant
AD847JNZ	Analog Devices	Active	300	50	3300	500	0 to 70	ROHS3 Compliant
AD848JNZ	Analog Devices	Active	300	175	3300	200	0 to 70	ROHS3 Compliant
OP07CPZ	Analog Devices	Active	0.3	—	1.8	60	-40 to 85	ROHS3 Compliant
OP07EPZ	Analog Devices	Active	0.3	—	1.2	30	0 to 70	ROHS3 Compliant
OP27EPZ	Analog Devices	Active	2.8	8	10	10	0 to 70	ROHS3 Compliant
OP27GPZ	Analog Devices	Active	2.8	8	15	30	-40 to 85	ROHS3 Compliant
OPA228P	Burr Brown	Active	11	33	2.5	5	-40 to 85	—
OPA228PA	Burr Brown	Active	11	33	2.5	10	-40 to 85	—

Engineering Selection Recommendations

For Direct Replacement with Extended Temperature Range: OP27GPZ is the recommended substitute when the application requires operation across the full industrial temperature range (-40°C to 85°C) matching the MAX437CPA. This part maintains active product status, ROHS3 compliance, and is manufactured by Analog Devices. The lower slew rate (2.8 V/µs vs. 17 V/µs) and reduced gain-bandwidth product (8 MHz vs. 60 MHz) are acceptable for general-purpose applications not requiring high-speed transient response.

For Precision Measurement Applications: OP07CPZ provides the lowest input bias current (1.8 nA) and operates across -40°C to 85°C with ROHS3 compliance. This part is suitable for applications prioritizing low-noise, precision signal conditioning where slew rate is not a limiting factor.

For High-Speed Applications with Reduced Temperature Range: AD848JNZ offers the highest gain-bandwidth product (175 MHz) and fastest slew rate (300 V/µs) among active substitutes. This part is suitable for wideband signal processing applications but operates only at 0°C to 70°C and exhibits higher input bias current (3.3 µA).

For Precision Wideband Applications: OPA228P and OPA228PA provide balanced performance with 11 V/µs slew rate, 33 MHz gain-bandwidth product, and low input offset voltage (5 µV and 10 µV respectively). Both operate across -40°C to 85°C. OPA228P is preferred when the lowest input offset voltage (5 µV) is required.

Compliance Considerations: All recommended substitutes except OPA228P and OPA228PA carry ROHS3 compliance certification. The MAX437CPA is RoHS non-compliant. Selection of ROHS3-compliant substitutes is necessary for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q1: Can AD847JNZ or AD848JNZ directly replace MAX437CPA in all applications?

A: AD847JNZ and AD848JNZ are pin-compatible in the 8-DIP package but exhibit significantly different electrical characteristics. The input bias current is 330 times higher (3.3 µA vs. 10 nA), and input offset voltage is 100 times higher (500 µV vs. 5 µV in AD847JNZ). These parts are suitable only for applications where higher bias current and offset voltage are acceptable. Additionally, these parts operate only at 0°C to 70°C, not the full -40°C to 85°C range of the MAX437CPA.

Q2: What is the primary difference between OP27EPZ and OP27GPZ?

A: Both parts are identical in electrical performance (2.8 V/µs slew rate, 8 MHz gain-bandwidth product, 10 nA input bias current). The key difference is operating temperature range: OP27EPZ operates at 0°C to 70°C, while OP27GPZ extends to -40°C to 85°C. For applications requiring the full industrial temperature range, OP27GPZ is the appropriate choice.

Q3: Why do OPA228P and OPA228PA have different input offset voltages despite identical part numbers?

A: OPA228P specifies 5 µV input offset voltage, while OPA228PA specifies 10 µV. Both are manufactured by Burr Brown and housed in 8-DIP packages. OPA228P is preferred for precision applications requiring the lowest offset voltage specification.

Q4: Is the 8-DIP package dimension identical across all substitute parts?

A: Yes. All substitute parts are specified as 8-DIP (0.300", 7.62mm) through-hole packages. Physical dimensions and pin spacing are identical, ensuring mechanical compatibility on existing printed circuit boards designed for the MAX437CPA.

Q5: Which substitute part best matches the MAX437CPA's 60 MHz gain-bandwidth product?

A: AD848JNZ provides the closest match with 175 MHz gain-bandwidth product, exceeding the MAX437CPA specification. OPA228P and OPA228PA provide 33 MHz, which is lower but suitable for general-purpose applications. OP27GPZ and OP27EPZ provide only 8 MHz and are suitable for lower-bandwidth applications.

Q6: What is the impact of selecting a substitute with lower slew rate than the MAX437CPA?

A: Lower slew rate limits the maximum rate of change of the output voltage. Applications involving fast transient signals or high-frequency switching may experience signal distortion or bandwidth limitations. OP07CPZ and OP07EPZ (0.3 V/µs) are suitable only for DC and low-frequency applications. OP27GPZ and OP27EPZ (2.8 V/µs) are suitable for audio and instrumentation applications. OPA228P and OPA228PA (11 V/µs) are suitable for moderate-speed signal processing.

Q7: Are all substitute parts RoHS compliant?

A: All substitute parts except OPA228P and OPA228PA carry ROHS3 compliance certification. OPA228P and OPA228PA do not specify RoHS status in the provided data. For applications subject to RoHS regulations, OP27GPZ, OP27EPZ, OP07CPZ, OP07EPZ, AD847JNZ, and AD848JNZ are compliant alternatives.

Q8: Which substitute part is recommended for new designs?

A: OP27GPZ is recommended for new designs requiring general-purpose amplification across the full industrial temperature range (-40°C to 85°C) with active product status and ROHS3 compliance. For precision applications, OP07CPZ is recommended. For high-speed applications, AD848JNZ is recommended, with the understanding that the operating temperature range is limited to 0°C to 70°C.

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