UFS370J/TR13 Equivalent & Substitute Parts

Part Overview

The UFS370J/TR13 is a general-purpose rectifier diode manufactured by Microchip Technology, rated for 700 V DC reverse voltage and 3 A average rectified current in a surface-mount DO-214AB (SMC) package. This component is classified as a fast recovery diode with a reverse recovery time of 60 ns and operates across a junction temperature range of -55°C to 175°C. The part is currently active in production and available in tape and reel packaging.

Substitute parts are necessary when the primary component becomes unavailable, when alternative manufacturers are required for supply chain diversification, or when design requirements permit operation at lower voltage ratings while maintaining equivalent current handling and thermal performance characteristics.

Key Parameters

Parameter	UFS370J/TR13	Unit
Voltage - DC Reverse (Vr) (Max)	700	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	—
Reverse Recovery Time (trr)	60	ns
Current - Reverse Leakage @ Vr	10 µA @ 700 V	µA
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the UFS370J/TR13 is determined by the following critical parameters:

Voltage Rating: The main part operates at 700 V DC reverse voltage. Substitute parts rated at 600 V are acceptable only in applications where the circuit design does not require the full 700 V rating. The 100 V voltage margin difference must be evaluated against circuit peak voltage requirements.

Current Rating: The 3 A average rectified current is the primary current specification. Substitute parts must maintain this 3 A rating or higher to ensure equivalent current-handling capability. Parts rated below 3 A are not suitable substitutes.

Package Type: All substitute parts must use the DO-214AB (SMC) surface-mount package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Recovery Speed: The main part is classified as fast recovery (≤ 500ns). Substitute parts may be either fast recovery or standard recovery (> 500ns) depending on application switching frequency requirements.

Temperature Range: The operating junction temperature range of -55°C to 175°C establishes the thermal operating envelope. Substitute parts with equivalent or wider temperature ranges are acceptable.

Compliance Status: RoHS3 compliance is a secondary consideration for applications requiring environmental compliance. The main part is RoHS non-compliant; substitute parts with RoHS3 compliance may be selected for regulated applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf @ If (V)	Speed	trr (ns)	Ir @ Vr (µA)	Tj Range (°C)	RoHS Status
UFS370J/TR13	Microchip Technology	700	3	1.2 @ 3A	Fast Recovery ≤ 500ns	60	10 @ 700V	-55 to 175	Non-compliant
ER3J-TP	Micro Commercial Co	600	3	1.7 @ 3A	Fast Recovery ≤ 500ns	35	5 @ 600V	-50 to 175	ROHS3 Compliant
ES3J	Good-Ark Semiconductor	600	3	1.7 @ 3A	Fast Recovery ≤ 500ns	35	10 @ 600V	-55 to 150	ROHS3 Compliant
RS3J-13-F	Diodes Incorporated	600	3	1.3 @ 3A	Fast Recovery ≤ 500ns	250	5 @ 600V	-65 to 150	ROHS3 Compliant
S3J	Diotec Semiconductor	600	3	1.15 @ 3A	Standard Recovery > 500ns	1500	5 @ 600V	-50 to 150	ROHS3 Compliant
S3J-TP	Micro Commercial Co	600	3	1.2 @ 3A	Standard Recovery > 500ns	Not specified	10 @ 600V	-55 to 150	ROHS3 Compliant
SMLJ60S6-TP	Micro Commercial Co	600	6	1.0 @ 6A	Standard Recovery > 500ns	Not specified	5 @ 600V	-55 to 150	ROHS3 Compliant
STTH2R06S	STMicroelectronics	600	2	1.7 @ 2A	Fast Recovery ≤ 500ns	50	2 @ 600V	-40 to 175	ROHS3 Compliant
STTH3L06S	STMicroelectronics	600	3	1.3 @ 3A	Fast Recovery ≤ 500ns	85	3 @ 600V	-40 to 175	ROHS3 Compliant
STTH3R06S	STMicroelectronics	600	3	1.7 @ 3A	Fast Recovery ≤ 500ns	35	3 @ 600V	-40 to 175	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Voltage-Rated Equivalents):

Parts rated at 700 V are not available in the provided substitute list. All listed substitutes operate at 600 V maximum reverse voltage, representing a 100 V reduction from the main part specification.

Fast Recovery Substitutes (≤ 500ns):

The following parts maintain fast recovery characteristics equivalent to the UFS370J/TR13:

ER3J-TP (Micro Commercial Co): 600 V, 3 A, 35 ns recovery time, ROHS3 compliant, -50°C to 175°C operating range
ES3J (Good-Ark Semiconductor): 600 V, 3 A, 35 ns recovery time, ROHS3 compliant, -55°C to 150°C operating range
RS3J-13-F (Diodes Incorporated): 600 V, 3 A, 250 ns recovery time, ROHS3 compliant, -65°C to 150°C operating range
STTH3L06S (STMicroelectronics): 600 V, 3 A, 85 ns recovery time, ROHS3 compliant, -40°C to 175°C operating range
STTH3R06S (STMicroelectronics): 600 V, 3 A, 35 ns recovery time, ROHS3 compliant, -40°C to 175°C operating range

Standard Recovery Substitutes (> 500ns):

The following parts operate with standard recovery characteristics and are suitable for lower-frequency switching applications:

S3J (Diotec Semiconductor): 600 V, 3 A, 1500 ns recovery time, ROHS3 compliant, -50°C to 150°C operating range
S3J-TP (Micro Commercial Co): 600 V, 3 A, standard recovery, ROHS3 compliant, -55°C to 150°C operating range

Higher Current Substitute:

SMLJ60S6-TP (Micro Commercial Co): 600 V, 6 A, standard recovery, ROHS3 compliant, -55°C to 150°C operating range. This part provides double the current rating and is suitable for applications requiring increased current capacity.

Lower Current Substitute:

STTH2R06S (STMicroelectronics): 600 V, 2 A, 50 ns recovery time, ROHS3 compliant, -40°C to 175°C operating range. This part is rated below the 3 A specification and is not recommended as a direct substitute.

Compliance Consideration:

All substitute parts listed are ROHS3 compliant, whereas the UFS370J/TR13 is RoHS non-compliant. Selection of a compliant substitute is appropriate for applications subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can I use a 600 V rated diode in place of the 700 V UFS370J/TR13?

A: Substitution at 600 V is permissible only if the circuit design ensures that peak reverse voltage does not exceed 600 V under any operating condition, including transient overvoltages. The 100 V margin reduction must be evaluated against the specific application requirements.

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

A: Fast recovery diodes have reverse recovery times of 500 ns or less, making them suitable for high-frequency switching applications. Standard recovery diodes exceed 500 ns recovery time and are appropriate for lower-frequency or linear applications. The UFS370J/TR13 is a fast recovery device; substitutes with either characteristic are listed.

Q: Are all substitute parts pin-compatible with the UFS370J/TR13?

A: Yes. All substitute parts use the DO-214AB (SMC) surface-mount package, which provides identical pin configuration and PCB footprint compatibility.

Q: Which substitute part most closely matches the UFS370J/TR13 specifications?

A: The STTH3R06S (STMicroelectronics) provides the closest electrical match: 600 V rating, 3 A current, 35 ns recovery time (matching the fast recovery classification), and ROHS3 compliance. The operating temperature range extends to 175°C, matching the main part's upper limit.

Q: Can I use the SMLJ60S6-TP as a substitute?

A: The SMLJ60S6-TP is rated for 6 A, which exceeds the 3 A requirement of the UFS370J/TR13. This part is suitable only if the circuit design accommodates the higher current rating and if the 600 V voltage specification is acceptable. The standard recovery characteristic (> 500ns) differs from the main part's fast recovery specification.

Q: What is the impact of forward voltage (Vf) differences between substitutes?

A: Forward voltage variations affect power dissipation and thermal performance. The UFS370J/TR13 specifies 1.2 V at 3 A. Substitutes range from 1.0 V to 1.7 V at their respective current ratings. Higher forward voltages result in increased power loss and heat generation; lower values reduce dissipation. Selection depends on thermal design margins and power budget constraints.

Q: Are there any substitutes with a 700 V rating?

A: No 700 V rated substitutes are provided in the available parts list. All substitutes operate at 600 V maximum reverse voltage.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates that the component meets Restriction of Hazardous Substances regulations, restricting the use of lead, cadmium, mercury, and other hazardous materials. The UFS370J/TR13 is RoHS non-compliant; all listed substitutes are ROHS3 compliant. Selection of a compliant substitute is required for applications subject to environmental directives in regulated markets.

Q: Can I substitute based on current rating alone?

A: No. Current rating is one of several critical parameters. Voltage rating, recovery speed, forward voltage, and operating temperature range must all be evaluated to ensure functional equivalence and circuit compatibility.

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