STTH3R04 Equivalent & Substitute Parts

Part Overview

The STTH3R04 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The STTH3R04 features fast recovery characteristics with a reverse recovery time of 35 nanoseconds, making it suitable for applications requiring rapid switching performance in power supply and rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction (Max)	175	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH3R04 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Mounting Type: Through Hole
Package / Case: DO-201AD or equivalent axial package

Secondary Compatibility Factors:

Speed classification (Fast Recovery vs. Standard Recovery) affects switching performance but does not prevent substitution
Forward voltage (Vf) variations within typical operating ranges are acceptable
Reverse recovery time (trr) differences are acceptable provided the part meets the application's switching requirements
Reverse leakage current variations are acceptable within standard tolerances
Operating temperature range differences are acceptable if the application operates within the substitute part's specified range

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and package specifications) and Functional Equivalents (matching voltage and current ratings with acceptable parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Product Status
STTH3R04	STMicroelectronics	400	3	1.5 @ 3 A	Fast Recovery ≤ 500ns	35	5 @ 400 V	DO-201AD	Obsolete
STTH3R04RL	STMicroelectronics	400	3	1.5 @ 3 A	Fast Recovery ≤ 500ns	35	5 @ 400 V	DO-201AD	Active
1N5404-E3/54	Vishay General Semiconductor	400	3	1.2 @ 3 A	Standard Recovery > 500ns	—	5 @ 400 V	DO-201AD	Active
1N5404-G	Comchip Technology	400	3	0.95 @ 3 A	Standard Recovery > 500ns	—	5 @ 400 V	DO-201AD	Active
1N5404G	onsemi	400	3	1.0 @ 3 A	Standard Recovery > 500ns	—	10 @ 400 V	DO-201AA / DO-27	Not For New Designs
1N5404GP-AP	Micro Commercial Co	400	3	1.1 @ 3 A	Standard Recovery > 500ns	—	5 @ 400 V	DO-201AD	Active
1N5404RLG	onsemi	400	3	1.0 @ 3 A	Standard Recovery > 500ns	—	10 @ 400 V	DO-201AA / DO-27	Not For New Designs
1N5418-TAP	Vishay General Semiconductor	400	3	1.5 @ 9 A	Fast Recovery ≤ 500ns	100	1 @ 200 V	SOD-64	Active
1N5625-TAP	Vishay General Semiconductor	400	3	1.0 @ 3 A	Standard Recovery > 500ns	7500	1 @ 200 V	SOD-64	Active
BYM36B-TAP	Vishay General Semiconductor	400	3	1.6 @ 3 A	Fast Recovery ≤ 500ns	100	5 @ 400 V	SOD-64	Active
BYT56G-TAP	Vishay General Semiconductor	400	3	1.4 @ 3 A	Fast Recovery ≤ 500ns	100	5 @ 400 V	SOD-64	Active

Engineering Selection Recommendations

Primary Recommendation: STTH3R04RL

The STTH3R04RL is the direct equivalent replacement for the obsolete STTH3R04. Both parts are manufactured by STMicroelectronics and share identical electrical specifications: 400 V reverse voltage, 3 A average rectified current, 1.5 V forward voltage at 3 A, and 35 nanosecond reverse recovery time. The STTH3R04RL is classified as Active and maintains full ROHS3 compliance and REACH unaffected status. This part is the preferred choice for direct substitution without circuit redesign.

Secondary Recommendations: 1N5404 Series (Multiple Manufacturers)

The 1N5404 series from Vishay General Semiconductor (1N5404-E3/54), Comchip Technology (1N5404-G), and Micro Commercial Co (1N5404GP-AP) are functional equivalents that meet the 400 V / 3 A electrical requirements. These parts feature standard recovery characteristics (> 500ns) rather than fast recovery, resulting in longer reverse recovery times. All three variants are classified as Active and maintain ROHS3 compliance. Selection among these variants depends on packaging preference (Cut Tape vs. standard packaging) and forward voltage tolerance requirements.

Alternative Consideration: onsemi 1N5404 Variants (1N5404G, 1N5404RLG)

The onsemi 1N5404G and 1N5404RLG meet the 400 V / 3 A electrical requirements but are classified as Not For New Designs. These parts are suitable only for legacy system maintenance or repair applications where component continuity is required. New designs should not incorporate these variants.

Package Variation Consideration: SOD-64 Alternatives (1N5418-TAP, 1N5625-TAP, BYM36B-TAP, BYT56G-TAP)

Vishay General Semiconductor offers 400 V / 3 A rectifier diodes in SOD-64 axial packages (1N5418-TAP, 1N5625-TAP, BYM36B-TAP, BYT56G-TAP). These parts are electrically equivalent but housed in a different physical package. SOD-64 packages are mechanically compatible with DO-201AD footprints in through-hole applications. Selection of SOD-64 variants is appropriate when packaging constraints or inventory availability favor this form factor.

Frequently Asked Questions (FAQ)

Q: Can STTH3R04RL be used as a direct replacement for STTH3R04?

A: Yes. The STTH3R04RL is manufactured by the same supplier (STMicroelectronics) and shares identical electrical specifications with the obsolete STTH3R04. Both parts are rated for 400 V reverse voltage, 3 A average rectified current, and feature 35 nanosecond reverse recovery time. The primary difference is product status: STTH3R04RL is Active while STTH3R04 is Obsolete. No circuit modifications are required.

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

A: Fast recovery diodes (≤ 500ns reverse recovery time) switch off more rapidly than standard recovery diodes (> 500ns). The STTH3R04 features fast recovery with 35 ns trr, while many 1N5404 variants feature standard recovery. In applications requiring rapid switching, such as high-frequency power supplies, fast recovery characteristics provide superior performance. Standard recovery diodes are acceptable in lower-frequency applications where switching speed is less critical.

Q: Are 1N5404 series diodes compatible with STTH3R04 applications?

A: The 1N5404 series (from Vishay, Comchip, and Micro Commercial Co) meets the core electrical requirements of 400 V reverse voltage and 3 A average rectified current. However, these parts feature standard recovery characteristics rather than fast recovery. Compatibility depends on the application's switching frequency and performance requirements. In applications where fast switching is essential, standard recovery 1N5404 variants may not provide equivalent performance. In lower-frequency rectification applications, 1N5404 variants are functionally compatible.

Q: Can SOD-64 packaged diodes replace DO-201AD packaged diodes?

A: SOD-64 and DO-201AD are both axial through-hole packages with compatible mechanical footprints. Parts such as 1N5418-TAP, 1N5625-TAP, BYM36B-TAP, and BYT56G-TAP in SOD-64 packages can be substituted for DO-201AD packaged diodes in through-hole applications. Physical dimensions and lead spacing are compatible. Verify that the specific application's PCB layout and component spacing accommodate the SOD-64 package dimensions.

Q: Why are onsemi 1N5404G and 1N5404RLG marked as Not For New Designs?

A: Parts classified as Not For New Designs indicate that the manufacturer has discontinued active development and recommends alternative components for new applications. While these parts remain available and functional, they are intended for legacy system support and repair only. New circuit designs should incorporate Active-status alternatives such as STTH3R04RL, 1N5404-E3/54, 1N5404-G, or 1N5404GP-AP.

Q: What compliance certifications are maintained across substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original STTH3R04. Moisture Sensitivity Level (MSL) is rated as 1 (Unlimited) for most variants, indicating no special moisture handling requirements during storage or assembly. ECCN classification remains EAR99 across all parts, and HTSUS code 8541.10.0080 applies uniformly.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) variations among substitute parts range from 0.95 V to 1.6 V at 3 A. In rectification circuits, forward voltage drop directly affects output voltage and power dissipation. The STTH3R04 specifies 1.5 V at 3 A. Substitute parts with lower Vf (such as 1N5404-G at 0.95 V) result in higher output voltage and lower heat dissipation. Substitute parts with higher Vf (such as BYM36B-TAP at 1.6 V) result in lower output voltage and higher heat dissipation. Circuit design must account for these variations if output voltage regulation is critical.

Q: Are reverse leakage current differences significant?

A: Reverse leakage current (Ir) specifications vary among substitute parts, ranging from 1 µA to 10 µA at rated reverse voltage. The STTH3R04 specifies 5 µA at 400 V. In most rectification applications, reverse leakage current is negligible compared to forward current and does not significantly affect circuit performance. In high-impedance or precision analog circuits, leakage current differences may require evaluation. Parts with lower leakage (1 µA) provide superior performance in such applications.

Q: What operating temperature ranges are specified for substitute parts?

A: Operating temperature ranges vary among substitute parts. The STTH3R04 specifies a maximum junction temperature of 175°C. Substitute parts specify ranges such as -50°C to 150°C (1N5404-E3/54), -65°C to 125°C (1N5404-G), -55°C to 175°C (1N5418-TAP, 1N5625-TAP, BYM36B-TAP, BYT56G-TAP), and -65°C to 150°C (1N5404G, 1N5404RLG). Selection should ensure that the substitute part's operating range encompasses the application's thermal environment.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message