1N4937GP-AP Equivalent & Substitute Parts

Part Overview

The 1N4937GP-AP 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 component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when identical electrical performance parameters and mechanical compatibility are maintained across different manufacturers, enabling procurement flexibility and supply chain continuity.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the 1N4937GP-AP are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 1 A
Speed Classification: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr: 5 µA @ 600 V
Operating Temperature - Junction: -55°C ~ 150°C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
Product Status: Active

The FR105G A0G from Taiwan Semiconductor Corporation meets all specified electrical and mechanical requirements and maintains equivalent compliance certifications.

Parameter Comparison

Parameter	1N4937GP-AP (Micro Commercial Co)	FR105G A0G (Taiwan Semiconductor Corporation)	Match Status
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1 A	1.3 V @ 1 A	Within Tolerance
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Equivalent
Reverse Recovery Time (trr)	200 ns	250 ns	Within Tolerance
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	Equivalent
Capacitance @ Vr, F	15 pF @ 4 V, 1 MHz	10 pF @ 4 V, 1 MHz	Within Tolerance
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Equivalent
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

The FR105G A0G is a direct substitute for the 1N4937GP-AP based on the following engineering criteria:

Electrical Equivalence: Both components maintain identical voltage ratings (600 V DC reverse), current ratings (1 A average rectified), and leakage characteristics (5 µA @ 600 V). Forward voltage and reverse recovery time variations fall within acceptable tolerance ranges for general-purpose rectifier applications.

Mechanical Compatibility: Both parts utilize identical through-hole mounting technology and DO-204AL/DO-41 axial package configurations, ensuring direct board-level compatibility without layout modifications.

Compliance Alignment: Both components are ROHS3 compliant and maintain Active product status, ensuring long-term availability and regulatory consistency.

Supply Chain Considerations: The FR105G A0G maintains higher inventory availability (5309 pieces) compared to the 1N4937GP-AP (685 pieces), supporting procurement continuity.

Frequently Asked Questions (FAQ)

Q: Can the FR105G A0G be used as a direct replacement for the 1N4937GP-AP in existing designs?

A: Yes. Both components share identical voltage ratings (600 V), current ratings (1 A), mounting type (through-hole), and package configuration (DO-41/DO-204AL). The components are electrically and mechanically interchangeable.

Q: What is the significance of the forward voltage difference (1.2 V vs. 1.3 V)?

A: The forward voltage difference of 0.1 V at 1 A represents a 8.3% variation. For general-purpose rectification applications, this difference is within acceptable tolerance and does not affect circuit functionality. Circuit designers should verify this parameter against specific application requirements if forward voltage drop is a critical design constraint.

Q: Does the reverse recovery time difference (200 ns vs. 250 ns) affect substitution suitability?

A: The reverse recovery time difference of 50 ns falls within the fast recovery classification (≤ 500 ns) for both components. For general-purpose rectification, this variation is acceptable. Applications requiring precise switching characteristics should evaluate this parameter against specific circuit requirements.

Q: Are the packaging designations DO-41 and DO-204AL interchangeable?

A: Yes. DO-41 and DO-204AL refer to the same axial through-hole package configuration. Both the 1N4937GP-AP and FR105G A0G utilize this identical package standard, ensuring mechanical and electrical compatibility.

Q: What compliance certifications apply to both parts?

A: Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.

Q: How does capacitance variation (15 pF vs. 10 pF) impact circuit performance?

A: The capacitance difference of 5 pF at 4 V, 1 MHz represents a 33% variation. For general-purpose rectification applications, this difference is within acceptable tolerance. High-frequency or precision timing applications should evaluate this parameter against specific circuit requirements.

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