1N4944-TP Equivalent & Substitute Parts

Part Overview

The 1N4944-TP is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating different packaging formats and recovery characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4944-TP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or superior electrical specifications across all critical parameters: 400 V reverse voltage rating, 1 A average rectified current, fast recovery characteristics (≤ 500 ns), and through-hole mounting in DO-41 package format. These parts differ in packaging presentation (tape & reel or cut tape) and minor variations in reverse recovery time (35 ns to 200 ns) and junction capacitance (10 pF to 17 pF), all within acceptable operating ranges.

Similar Parts share the same voltage and current ratings but differ in recovery speed classification or current rating. Standard recovery diodes (> 500 ns) and 2 A rated devices fall into this category. These parts are suitable for applications where switching speed is not critical or where higher current capacity provides design margin.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): 400 V (mandatory match)
Current - Average Rectified (Io): 1 A minimum (equal or higher acceptable)
Mounting Type: Through Hole (mandatory match)
Package / Case: DO-41 or DO-204AL (compatible formats)
Operating Temperature Range: -55°C to 150°C minimum (equal or wider acceptable)
RoHS Status: ROHS3 Compliant (mandatory match)

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	trr	Speed	Package	Status
1N4944-TP	Micro Commercial Co	400 V	1 A	1.3 V @ 1 A	150 ns	Fast Recovery ≤ 500 ns	DO-41	Obsolete
1N4936GP-TP	Micro Commercial Co	400 V	1 A	1.2 V @ 1 A	200 ns	Fast Recovery ≤ 500 ns	DO-41	Active
FR104GP-TP	Micro Commercial Co	400 V	1 A	1.3 V @ 1 A	150 ns	Fast Recovery ≤ 500 ns	DO-41	Active
SF16G-TP	Micro Commercial Co	400 V	1 A	1.3 V @ 1 A	35 ns	Fast Recovery ≤ 500 ns	DO-41	Active
UF4004GP-TP	Micro Commercial Co	400 V	1 A	1.3 V @ 1 A	50 ns	Fast Recovery ≤ 500 ns	DO-41	Active
FR104G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150 ns	Fast Recovery ≤ 500 ns	DO-41	Active
FR104G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150 ns	Fast Recovery ≤ 500 ns	DO-41	Active
1N4004G R1G	Taiwan Semiconductor Corporation	400 V	1 A	1.0 V @ 1 A	—	Standard Recovery > 500 ns	DO-41	Active
1N3612GP-E3/73	Vishay General Semiconductor	400 V	1 A	1.0 V @ 1 A	2 µs	Standard Recovery > 500 ns	DO-41	Active
1N4936GHB0G	Taiwan Semiconductor Corporation	400 V	1 A	1.2 V @ 1 A	200 ns	Fast Recovery ≤ 500 ns	DO-41	Active
MUR240RLG	onsemi	400 V	2 A	1.3 V @ 2 A	65 ns	Fast Recovery ≤ 500 ns	Axial	Active

Engineering Selection Recommendations

Primary Parametric Equivalents (Direct Replacement):

The following parts are recommended as direct replacements for the 1N4944-TP in active production designs:

FR104GP-TP (Micro Commercial Co): Identical electrical specifications including 150 ns reverse recovery time and 1.3 V forward voltage. Available in tape & reel packaging. Active product status with ROHS3 compliance.
SF16G-TP (Micro Commercial Co): Meets all electrical requirements with superior reverse recovery time of 35 ns, providing enhanced switching performance. Available in cut tape packaging. Active product status with ROHS3 compliance.
UF4004GP-TP (Micro Commercial Co): Meets all electrical requirements with 50 ns reverse recovery time. Highest inventory availability (15,757 pcs). Available in cut tape packaging. Active product status with ROHS3 compliance.
FR104G A0G (Taiwan Semiconductor Corporation): Identical electrical specifications to 1N4944-TP with 150 ns reverse recovery time. Highest inventory among TSC variants (5,396 pcs). Active product status with ROHS3 compliance and REACH unaffected designation.

Secondary Parametric Equivalents (Minor Specification Variation):

1N4936GP-TP (Micro Commercial Co): Slightly lower forward voltage (1.2 V vs. 1.3 V) and longer reverse recovery time (200 ns vs. 150 ns). Active product status with ROHS3 compliance. Suitable where lower forward voltage drop is beneficial.
1N4936GHB0G (Taiwan Semiconductor Corporation): Automotive-grade equivalent with AEC-Q101 qualification. Identical electrical performance to 1N4936GP-TP. Active product status with ROHS3 compliance. Required for automotive applications.

Similar Parts (Functional Alternatives):

1N4004G R1G (Taiwan Semiconductor Corporation): Standard recovery diode with lower forward voltage (1.0 V). Suitable for applications where switching speed is not critical. Active product status with ROHS3 compliance.
1N3612GP-E3/73 (Vishay General Semiconductor): SUPERECTIFIER® series with standard recovery characteristics and lower forward voltage (1.0 V). Extended operating temperature range (-65°C to 175°C). Active product status with ROHS3 compliance.
MUR240RLG (onsemi): Higher current rating (2 A) with superior reverse recovery time (65 ns). Axial package format. Active product status with ROHS3 compliance. Suitable where higher current capacity or faster switching is required.

All recommended substitutes maintain ROHS3 compliance and are classified as active products, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use FR104GP-TP as a direct replacement for 1N4944-TP?

A: Yes. FR104GP-TP is a parametric equivalent with identical voltage rating (400 V), current rating (1 A), forward voltage (1.3 V @ 1 A), and reverse recovery time (150 ns). Both are fast recovery diodes in DO-41 package format. The primary difference is packaging presentation (tape & reel vs. bulk), which does not affect electrical performance.

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

A: Recovery speed refers to reverse recovery time (trr), the time required for a diode to stop conducting when reverse bias is applied. Fast recovery diodes (≤ 500 ns) are suitable for high-frequency switching applications. Standard recovery diodes (> 500 ns) are appropriate for low-frequency rectification where switching speed is not critical. The 1N4944-TP is a fast recovery device with 150 ns trr.

Q: Why does SF16G-TP have a lower reverse recovery time (35 ns) than 1N4944-TP (150 ns)?

A: Different semiconductor manufacturing processes and doping profiles result in varying recovery characteristics. SF16G-TP's 35 ns trr represents superior switching performance, making it suitable for higher-frequency applications. Both parts meet the 400 V / 1 A specifications and are electrically compatible for the 1N4944-TP application.

Q: Can I substitute MUR240RLG for 1N4944-TP?

A: MUR240RLG is functionally compatible but differs in two aspects: it is rated for 2 A (vs. 1 A) and uses an axial package format (vs. DO-41). The higher current rating provides design margin but does not affect compatibility. The axial package requires different board layout and mounting considerations compared to DO-41.

Q: What does ROHS3 compliance mean?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component meets European Union environmental standards restricting the use of hazardous materials including lead, cadmium, mercury, and certain flame retardants. All recommended substitutes maintain ROHS3 compliance, ensuring regulatory compatibility.

Q: Is 1N4936GHB0G suitable for automotive applications?

A: Yes. 1N4936GHB0G carries AEC-Q101 automotive qualification, indicating it meets automotive industry reliability and performance standards. It is suitable for automotive applications where 1N4944-TP was previously used. Standard commercial-grade equivalents (without AEC-Q101) are not recommended for automotive use.

Q: What is the difference between cut tape (CT) and tape & reel (TR) packaging?

A: Cut tape packaging provides individual component strips suitable for manual assembly or small-volume production. Tape & reel packaging provides components on continuous reels suitable for automated pick-and-place assembly equipment. Electrical specifications are identical; packaging choice depends on assembly process requirements.

Q: Can I use 1N4004G R1G instead of 1N4944-TP?

A: 1N4004G R1G is electrically compatible for voltage and current ratings but uses standard recovery technology (> 500 ns) instead of fast recovery (≤ 500 ns). It is suitable for low-frequency rectification applications where switching speed is not critical. For high-frequency switching applications, fast recovery equivalents (FR104GP-TP, SF16G-TP, UF4004GP-TP) are recommended.

Q: Why is 1N4944-TP listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Equivalent active products from the same or alternative manufacturers provide identical or superior electrical performance and ensure continued availability for new designs and production requirements.

Q: What is junction capacitance and why does it vary among substitutes?

A: Junction capacitance (measured at 4 V, 1 MHz) represents the capacitive effect at the diode junction. Values range from 10 pF to 17 pF among substitutes. This parameter affects high-frequency performance but does not impact standard rectification applications. Lower capacitance (SF16G-TP at 10 pF) provides better high-frequency characteristics.

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