DL4937-13 Equivalent & Substitute Parts

Part Overview

The DL4937-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 600 V DC reverse voltage and 1 A average rectified current in a surface mount MELF package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

The DL4937-13 operates as a fast recovery diode with a reverse recovery time of 200 ns, suitable for applications requiring rapid switching characteristics in power conversion and signal protection circuits. Equivalent substitute parts must maintain compatibility across voltage rating, current capacity, mounting type, 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	V
Reverse Recovery Time (trr)	200	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF (Glass)	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the DL4937-13 is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Surface Mount
Package compatibility: MELF or equivalent surface mount form factor

Performance Considerations:

Reverse Recovery Time (trr): Fast recovery (≤500 ns) preferred for switching applications
Forward Voltage (Vf): Lower values indicate improved efficiency
Reverse Leakage Current: Lower values indicate superior blocking characteristics
Operating Temperature Range: Extended range supports broader application environments

The three substitute parts identified—1N5618US, 1N6482-E3/96, and 1N6663US—each satisfy the mandatory voltage and current requirements while offering varying performance characteristics and compliance profiles.

Parameter Comparison

Parameter	DL4937-13	1N5618US	1N6482-E3/96	1N6663US
Manufacturer	Diodes Incorporated	Microchip Technology	Vishay General Semiconductor	Microchip Technology
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	1 A	1 A	1 A	500 mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1 A	1.3 V @ 3 A	1.1 V @ 1 A	1 V @ 400 mA
Speed Classification	Fast Recovery ≤500 ns	Standard Recovery >500 ns	Standard Recovery >500 ns	Fast Recovery ≤500 ns
Reverse Recovery Time (trr)	200 ns	2 µs	Not specified	Not specified
Current - Reverse Leakage @ Vr	5 µA @ 600 V	500 nA @ 600 V	10 µA @ 600 V	50 nA @ 600 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	Not specified	8 pF @ 4V, 1MHz	Not specified
Package / Case	DO-213AB, MELF (Glass)	SQ-MELF, A	DO-213AB, MELF (Glass)	SQ-MELF, A
Operating Temperature - Junction	-65 to 150 °C	-65 to 200 °C	-65 to 175 °C	-65 to 175 °C
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

1N6482-E3/96 (Vishay General Semiconductor)

The 1N6482-E3/96 is the primary substitute for the DL4937-13. This part maintains identical voltage and current ratings, operates within the same temperature range extension, and is packaged in the original DO-213AB MELF form factor. The 1N6482-E3/96 achieves ROHS3 compliance, addressing regulatory requirements absent in the original part. Forward voltage performance (1.1 V @ 1 A) exceeds the DL4937-13 specification. Reverse leakage current (10 µA @ 600 V) remains within acceptable bounds for general-purpose rectification. This substitute is recommended for applications where package form factor and compliance posture are primary selection drivers.

1N5618US (Microchip Technology)

The 1N5618US maintains full voltage and current compatibility with the DL4937-13 but operates with standard recovery characteristics (2 µs trr) rather than fast recovery. This substitute exhibits superior reverse leakage performance (500 nA @ 600 V) and extended operating temperature range (-65 to 200 °C). The SQ-MELF package form factor differs from the original DO-213AB specification. This substitute is suitable for applications where switching speed is not critical and where extended temperature operation is beneficial.

1N6663US (Microchip Technology)

The 1N6663US is a reduced-current alternative rated for 500 mA average rectified current, below the 1 A requirement of the DL4937-13. This part maintains fast recovery characteristics (≤500 ns) and demonstrates superior reverse leakage performance (50 nA @ 600 V). The SQ-MELF package differs from the original specification. This substitute is applicable only to applications where actual circuit current demand does not exceed 500 mA.

Frequently Asked Questions (FAQ)

Q: Can the 1N6663US replace the DL4937-13 in all applications?

A: No. The 1N6663US is rated for 500 mA average rectified current, while the DL4937-13 is rated for 1 A. Substitution is valid only for circuits where the actual operating current does not exceed 500 mA. Exceeding this rating causes device failure and circuit malfunction.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Fast recovery diodes exhibit reverse recovery times of 200 ns or less, enabling rapid switching transitions suitable for high-frequency power conversion. Standard recovery diodes exhibit reverse recovery times exceeding 500 ns, introducing switching delays. The DL4937-13 and 1N6663US are fast recovery devices. The 1N5618US is a standard recovery device. Selection depends on circuit switching frequency requirements.

Q: Are the package differences between DO-213AB and SQ-MELF significant?

A: Both DO-213AB and SQ-MELF are surface mount MELF packages with similar physical dimensions and PCB footprints. However, they are not identical. Verify PCB layout compatibility before substitution. The 1N6482-E3/96 maintains the original DO-213AB package, eliminating this consideration.

Q: Does RoHS compliance affect substitution decisions?

A: RoHS compliance status reflects regulatory requirements in specific markets and applications. The 1N6482-E3/96 achieves ROHS3 compliance, while the DL4937-13, 1N5618US, and 1N6663US do not. Applications subject to RoHS regulations require the 1N6482-E3/96 or equivalent compliant alternatives.

Q: What does reverse leakage current indicate?

A: Reverse leakage current measures the small current flowing through the diode when reverse-biased. Lower values indicate superior blocking characteristics and reduced power dissipation in the reverse-biased state. The 1N6663US exhibits the lowest reverse leakage (50 nA @ 600 V), followed by 1N5618US (500 nA @ 600 V), while the DL4937-13 and 1N6482-E3/96 exhibit higher leakage (5 µA and 10 µA respectively).

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage drop directly impacts power dissipation and voltage regulation in rectification circuits. The 1N6482-E3/96 exhibits the lowest forward voltage (1.1 V @ 1 A), improving efficiency compared to the DL4937-13 (1.2 V @ 1 A). The 1N5618US forward voltage specification (1.3 V @ 3 A) is measured at a different current level, limiting direct comparison. Circuit design must account for these differences in voltage regulation calculations.

Q: What is the significance of operating temperature range?

A: Operating temperature range defines the junction temperature limits within which the device functions reliably. The DL4937-13 operates to 150 °C, while the 1N5618US extends to 200 °C and the 1N6482-E3/96 and 1N6663US to 175 °C. Applications in high-temperature environments require substitutes with extended temperature ratings.

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