1N4937GP-TP Equivalent & Substitute Parts

Part Overview

The 1N4937GP-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 600 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This diode is classified as a fast recovery device with a reverse recovery time of 200 ns, suitable for standard rectification applications requiring moderate switching speeds. The part is Active in product status and fully compliant with RoHS3 and REACH regulations.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters that define rectifier diode functionality: reverse voltage rating, average rectified current, forward voltage characteristics, recovery time, and package form factor.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 1 A
Reverse Recovery Time (trr)	200	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1N4937GP-TP is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial variants
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance: Required
Technology: Standard rectifier diode

Acceptable Variation Ranges:

Voltage - Forward (Vf) (Max) @ If: 1.2 V to 1.3 V @ 1 A
Reverse Recovery Time (trr): 200 ns to 250 ns
Current - Reverse Leakage @ Vr: 5 µA @ 600 V (fixed)
Capacitance @ Vr, F: 10 pF to 15 pF @ 4V, 1MHz

All identified substitute parts meet these criteria and are classified as parametric equivalents. Packaging format variations (Tape & Reel versus Cut Tape) do not affect electrical substitutability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	trr [ns]	Ir @ Vr [µA @ V]	Package	Packaging Type	Grade
1N4937GP-TP	Micro Commercial Co	600	1	1.2 @ 1	200	5 @ 600	DO-41	Tape & Reel (TR)	Standard
1N4937G	Taiwan Semiconductor Corporation	600	1	1.2 @ 1	200	5 @ 600	DO-204AL (DO-41)	Cut Tape (CT)	Standard
1N4937GH	Taiwan Semiconductor Corporation	600	1	1.2 @ 1	200	5 @ 600	DO-204AL (DO-41)	Cut Tape (CT)	Automotive (AEC-Q101)
FR105G	Taiwan Semiconductor Corporation	600	1	1.3 @ 1	250	5 @ 600	DO-204AL (DO-41)	Cut Tape (CT)	Standard
FR105G A0G	Taiwan Semiconductor Corporation	600	1	1.3 @ 1	250	5 @ 600	DO-204AL (DO-41)	Cut Tape (CT)	Standard
PG4937_R2_00001	Panjit International Inc.	600	1	1.2 @ 1	200	5 @ 600	DO-41	Cut Tape (CT)	Standard

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Electrical Characteristics):

The parts 1N4937G, 1N4937GH, and PG4937_R2_00001 provide direct electrical equivalence to the 1N4937GP-TP. These devices maintain identical forward voltage (1.2 V @ 1 A) and reverse recovery time (200 ns) specifications. The 1N4937GH variant includes automotive-grade qualification (AEC-Q101), which adds reliability assurance for automotive applications without altering core electrical performance.

Functional Equivalents (Within Acceptable Variation):

The FR105G and FR105G A0G devices operate within acceptable parameter variation, with forward voltage increased to 1.3 V @ 1 A and reverse recovery time extended to 250 ns. These variations remain within the fast recovery classification and do not compromise rectification performance in standard applications. Both variants are identical to each other and differ only in designation.

Compliance and Regulatory Status:

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification. Moisture sensitivity level remains at MSL 1 (Unlimited) across all options. Product status is Active for all identified substitutes, ensuring continued availability and manufacturing support.

Packaging Considerations:

The 1N4937GP-TP is supplied in Tape & Reel format. Substitute parts are available in Cut Tape packaging. Both packaging formats are suitable for through-hole assembly and do not affect electrical performance or mechanical fit in standard PCB applications.

Frequently Asked Questions (FAQ)

Q: Can 1N4937G be used as a direct replacement for 1N4937GP-TP?

A: Yes. The 1N4937G maintains identical electrical specifications: 600 V reverse voltage, 1 A average rectified current, 1.2 V forward voltage @ 1 A, and 200 ns reverse recovery time. Both are standard-grade devices with equivalent performance. The difference in packaging format (Cut Tape versus Tape & Reel) does not affect electrical substitutability.

Q: What is the difference between 1N4937GH and 1N4937G?

A: Both devices are electrically identical with 600 V, 1 A, 1.2 V forward voltage, and 200 ns recovery time. The 1N4937GH carries automotive-grade qualification (AEC-Q101), indicating enhanced reliability screening and qualification for automotive applications. Standard-grade applications may use either variant.

Q: Can FR105G replace 1N4937GP-TP?

A: FR105G is a functional equivalent with acceptable parameter variation. It maintains 600 V reverse voltage and 1 A current rating but has forward voltage of 1.3 V @ 1 A (versus 1.2 V) and reverse recovery time of 250 ns (versus 200 ns). These variations remain within fast recovery classification and are suitable for general rectification applications where the slightly higher forward voltage and longer recovery time do not create circuit constraints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the 1N4937GP-TP.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel and Cut Tape packaging formats are handling and delivery methods only. They do not alter electrical characteristics, performance, or mechanical fit in through-hole applications.

Q: What is the significance of the DO-204AL designation?

A: DO-204AL is the formal package designation for the DO-41 axial through-hole form factor. These designations are equivalent and refer to the same physical package. Devices specified as DO-204AL (DO-41) or DO-41 are mechanically and electrically interchangeable.

Q: Can PG4937_R2_00001 be substituted for 1N4937GP-TP?

A: Yes. The PG4937_R2_00001 is a direct electrical equivalent manufactured by Panjit International Inc., with identical 600 V, 1 A, 1.2 V forward voltage, and 200 ns recovery time specifications. It is suitable for direct substitution in all applications.

Q: What determines whether a diode is a valid substitute?

A: Valid substitution requires equivalence in reverse voltage rating, average rectified current, forward voltage characteristics, recovery time classification, package form factor, and mounting type. All identified substitutes meet these criteria. Minor variations in forward voltage (1.2 V to 1.3 V) and recovery time (200 ns to 250 ns) are acceptable within the fast recovery diode classification.

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