1N6639 Equivalent & Substitute Parts Reference

Part Overview

The 1N6639 is a general purpose fast recovery diode from Microchip Technology, categorized under Diodes, Rectifiers. It features a maximum DC reverse voltage of 75V, an average rectified current of 300mA, and a fast reverse recovery time of 4ns, supplied in a DO-204AH (DO-35), through-hole axial package. The part is currently active and available in inventory.

Alternative models are often necessary when the original part is discontinued, faces long lead times, restrictions in specific applications, or due to changes in compliance status or qualification requirements.

Key Parameters

Parameter	Reference Value
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	75 V
Current - Average Rectified (Io)	300mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 500 mA
Reverse Recovery Time (trr)	4 ns
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Operating Temperature - Junction	-65°C ~ 175°C
Technology	Standard
Speed	Fast Recovery =< 500ns, > 200mA (Io)

Substitute Part Grouping Explanation

Substitute parts are identified strictly through parameters shared with the 1N6639. These include diode category, maximum reverse voltage (75V), average rectified current (minimum 200mA or 300mA), forward voltage, reverse recovery time, package compatibility (DO-35, axial, through-hole), standard technology type, and matching or wider operating temperature ranges.

Parametric equivalents match all major electrical characteristics, package type, and mounting style; similar types maintain the same maximum reverse voltage but may differ in average rectified current or speed type.

Key substitution parameters:

Voltage - DC Reverse (Vr) (Max)
Current - Average Rectified (Io)
Voltage - Forward (Vf) (Max) @ If
Reverse Recovery Time (trr)
Speed
Mounting Type
Package / Case
Technology

Parameter Comparison

Manufacturer Part Number	Manufacturer	Category	Voltage - DC Reverse (Vr) (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Reverse Recovery Time (trr)	Speed	Mounting Type	Package / Case	Operating Temperature - Junction	Technology	Product Status
1N6639	Microchip Technology	Diodes, Rectifiers	75 V	300mA	1.2 V @ 500 mA	4 ns	Fast Recovery =< 500ns, > 200mA (Io)	Through Hole	DO-204AH, DO-35, Axial	-65°C ~ 175°C	Standard	Active
JANS1N6642	Semtech Corporation	Diodes, Rectifiers	75 V	300mA	1.2 V @ 100 mA	5 ns	Fast Recovery =< 500ns, > 200mA (Io)	Through Hole	Axial	-65°C ~ 175°C	Standard	Discontinued at Digi-Key
JANTX1N6642	Semtech Corporation	Diodes, Rectifiers	75 V	300mA	1.2 V @ 100 mA	5 ns	Fast Recovery =< 500ns, > 200mA (Io)	Through Hole	Axial	-65°C ~ 175°C	Standard	Discontinued at Digi-Key
1N4448	Microchip Technology	Diodes, Rectifiers	75 V	200mA	1 V @ 100 mA	4 ns	Small Signal =< 200mA (Io), Any Speed	Through Hole	DO-204AH, DO-35, Axial	-65°C ~ 150°C	Standard	Discontinued at Digi-Key

Engineering Selection Recommendations

JANS1N6642 and JANTX1N6642 match the voltage, current, mounting type, package style, and maximum junction temperature. Both are military qualified per MIL-PRF-19500/578.
1N4448 matches voltage, package, and mounting type, but the average rectified current is lower (200mA) and the maximum operating temperature is +150°C.
The 1N6639 is active, while both JANS1N6642 and JANTX1N6642 are discontinued at Digi-Key. 1N4448 is also discontinued at Digi-Key.
Regulatory/compliance fields such as REACH status or ECCN are only present for some items. No RoHS compliance is listed for JANS1N6642 or JANTX1N6642. 1N4448 is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q1: What are the most critical parameters for substituting the 1N6639 diode?
A1: The most critical parameters include maximum DC reverse voltage (75V), average rectified current (preferably 300mA), reverse recovery time (4–5ns for fast recovery types), similar speed classification, through-hole axial package compatibility, and standard technology.

Q2: Do substitute parts need to have the same reverse recovery time as the 1N6639?
A2: Substitute parts in this context meet similar fast recovery criteria, with reverse recovery times of 4–5ns, closely matching the 1N6639’s 4ns characteristic.

Q3: Does package type impact compatibility for through-hole designs?
A3: Yes, compatibility is ensured by matching the DO-204AH, DO-35, or general axial through-hole package specification among substitutes.

Q4: Can parts with lower average rectified current (Io) be substituted?
A4: Only if provided in the list, substitutes with at least 200mA current rating and all other matching parameters can be considered, as in the case of the 1N4448.

Q5: Is RoHS or REACH status relevant for these substitutes?
A5: Only if provided. 1N4448 is noted as RoHS non-compliant and REACH Unaffected. Compliance status should be reviewed if such requirements are essential to the application.

Q6: Are all substitutes active and available?
A6: The 1N6639 is listed as active. Both JANS1N6642 and JANTX1N6642, as well as the 1N4448, are discontinued at Digi-Key. Availability should be checked based on provided inventory or other sources.

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