STTH3R02Q Equivalent & Substitute Parts

Part Overview

The STTH3R02Q is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 3 A average rectified current in a DO-15 through-hole axial package. This part is classified as obsolete, indicating it has been discontinued and is no longer recommended for new designs. Identifying equivalent and substitute parts is necessary to support existing applications, facilitate design transitions, and ensure continued component availability for maintenance and repair operations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 3 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	3	µA @ 200 V
Operating Temperature - Junction (Max)	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH3R02Q is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 3 A minimum
Voltage - Forward (Vf) (Max) @ If: 1 V or lower at 3 A
Mounting Type: Through Hole
Package / Case: DO-15, DO-201AD, or DO-27 axial configurations

Secondary Compatibility Factors:

Speed Classification: Fast Recovery (≤ 500ns) preferred for direct replacement; Standard Recovery (> 500ns) acceptable with application verification
Reverse Recovery Time (trr): 30 ns to 150 ns range maintains performance characteristics
Operating Temperature - Junction: 150°C minimum to 175°C maximum
RoHS Status: ROHS3 Compliant required

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and package specifications) and Functional Equivalents (matching electrical ratings with alternative package configurations).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	Product Status
STTH3R02Q	STMicroelectronics	200	3	1 @ 3A	Fast Recovery ≤ 500ns	30	3 @ 200V	175	DO-15	Obsolete
STTH3R02QRL	STMicroelectronics	200	3	1 @ 3A	Fast Recovery ≤ 500ns	30	3 @ 200V	175	DO-15	Active
1N5402-G	Comchip Technology	200	3	1 @ 3A	Standard Recovery > 500ns	—	5 @ 200V	125	DO-27	Active
1N5402G	Taiwan Semiconductor Corporation	200	3	1 @ 3A	Standard Recovery > 500ns	—	5 @ 200V	150	DO-201AD	Active
1N5402RLG	onsemi	200	3	1 @ 3A	Standard Recovery > 500ns	—	10 @ 200V	150	DO-27	Not For New Designs
BY251P-E3/73	Vishay General Semiconductor - Diodes Division	200	3	1.1 @ 3A	Standard Recovery > 500ns	3000	5 @ 200V	150	DO-201AD	Active
EGP30D	onsemi	200	3	0.95 @ 3A	Fast Recovery ≤ 500ns	50	5 @ 200V	150	DO-201AD	Not For New Designs
FR303GP-AP	Micro Commercial Co	200	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	5 @ 200V	150	DO-201AD	Active
GP30D-E3/54	Vishay General Semiconductor - Diodes Division	200	3	1.1 @ 3A	Standard Recovery > 500ns	5000	5 @ 200V	175	DO-201AD	Active
GP30D-E3/73	Vishay General Semiconductor - Diodes Division	200	3	1.1 @ 3A	Standard Recovery > 500ns	5000	5 @ 200V	175	DO-201AD	Active
HER303G-AP	Micro Commercial Co	200	3	0.95 @ 3A	Fast Recovery ≤ 500ns	50	10 @ 200V	150	DO-201AD	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Specifications):

STTH3R02QRL is the primary direct replacement for STTH3R02Q. Both parts are manufactured by STMicroelectronics with identical electrical ratings (200 V, 3 A, 1 V forward voltage, 30 ns reverse recovery time, 175°C maximum junction temperature) and fast recovery characteristics. STTH3R02QRL carries Active product status and is ROHS3 compliant. The only difference is packaging format: STTH3R02QRL is supplied in Cut Tape (CT) format versus the original Tape & Box (TB) format. This substitution requires no circuit modifications.

Tier 2 - Functional Equivalents with Fast Recovery Characteristics:

EGP30D (onsemi) and HER303G-AP (Micro Commercial Co) provide functional equivalence with fast recovery speed (≤ 500ns, 50 ns trr) and superior forward voltage characteristics (0.95 V). Both are rated for 200 V, 3 A, and operate to 150°C maximum junction temperature. EGP30D is classified as Not For New Designs; HER303G-AP is Active. Both use DO-201AD package configuration. These parts are suitable for applications where fast recovery performance is required and package transition from DO-15 to DO-201AD is acceptable.

Tier 3 - Functional Equivalents with Standard Recovery Characteristics:

1N5402G (Taiwan Semiconductor Corporation), 1N5402-G (Comchip Technology), BY251P-E3/73 (Vishay), GP30D-E3/54, and GP30D-E3/73 (Vishay) meet the 200 V, 3 A electrical requirements with standard recovery characteristics (> 500ns). These parts feature Active or Not For New Designs status and ROHS3 compliance. GP30D variants operate to 175°C maximum junction temperature, matching the original part. Standard recovery diodes exhibit longer reverse recovery times (3 µs to 5 µs) compared to the STTH3R02Q (30 ns), which may affect switching performance in high-frequency applications. Selection of these parts requires verification that application switching frequencies are compatible with standard recovery characteristics.

Tier 4 - Limited Compatibility:

1N5402RLG (onsemi) is classified as Not For New Designs and exhibits elevated reverse leakage current (10 µA @ 200 V) compared to the original specification (3 µA @ 200 V). This part is suitable only for legacy system maintenance where no alternative is available.

Compliance and Certification:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can STTH3R02QRL be used as a direct replacement for STTH3R02Q without circuit modifications?

A: Yes. STTH3R02QRL is electrically and functionally identical to STTH3R02Q. Both parts are rated for 200 V, 3 A, feature 1 V maximum forward voltage at 3 A, 30 ns reverse recovery time, and 175°C maximum junction temperature. The only difference is packaging format (Cut Tape versus Tape & Box). No circuit modifications are required. STTH3R02QRL carries Active product status, making it the recommended replacement for obsolete STTH3R02Q.

Q: What is the difference between fast recovery and standard recovery diodes in this product category?

A: Fast recovery diodes (≤ 500ns reverse recovery time) switch off more rapidly than standard recovery diodes (> 500ns). The STTH3R02Q features fast recovery with 30 ns reverse recovery time. Standard recovery alternatives such as 1N5402G and BY251P-E3/73 exhibit reverse recovery times of 3 µs to 5 µs. In low-frequency applications (< 1 kHz), this difference is negligible. In high-frequency switching applications (> 10 kHz), fast recovery characteristics reduce switching losses and electromagnetic interference. Application-specific frequency requirements determine whether standard recovery substitutes are acceptable.

Q: Are all substitute parts available in the same DO-15 package as the original STTH3R02Q?

A: No. STTH3R02QRL is the only substitute available in DO-15 package. Most functional equivalents (1N5402G, 1N5402-G, BY251P-E3/73, EGP30D, FR303GP-AP, GP30D variants, HER303G-AP) use DO-201AD or DO-27 package configurations. These packages are physically larger axial-lead components. PCB layout modifications may be required to accommodate the larger package footprint. STTH3R02QRL is recommended when package compatibility is critical.

Q: What is the significance of the maximum junction temperature rating difference between substitute parts?

A: The STTH3R02Q and STTH3R02QRL are rated to 175°C maximum junction temperature. Most functional equivalents are rated to 150°C. GP30D-E3/54 and GP30D-E3/73 are rated to 175°C, matching the original specification. In applications operating near thermal limits, parts rated to 175°C provide additional thermal margin. For applications with adequate thermal management maintaining junction temperatures below 150°C, the lower-rated substitutes are acceptable.

Q: How does forward voltage variation affect substitute part selection?

A: The STTH3R02Q specifies 1 V maximum forward voltage at 3 A. Substitute parts range from 0.95 V (EGP30D, HER303G-AP) to 1.3 V (FR303GP-AP). Forward voltage directly affects power dissipation: P = Vf × I. A 0.3 V difference at 3 A represents 0.9 W additional dissipation. In high-current or continuous-duty applications, lower forward voltage substitutes (0.95 V to 1 V) reduce thermal load. In low-current or intermittent applications, forward voltage variation has minimal impact. Thermal analysis of the specific application determines whether forward voltage differences are significant.

Q: Can parts classified as "Not For New Designs" be used in existing applications?

A: Yes. Parts classified as Not For New Designs (1N5402RLG, EGP30D) are suitable for maintenance, repair, and support of existing systems. This classification indicates the manufacturer has discontinued active development and recommends alternative parts for new designs. For legacy system support where the original part is obsolete, Not For New Designs substitutes provide continued availability. However, for new product development, Active-status alternatives are preferred to ensure long-term supply continuity.

Q: What is the impact of reverse leakage current variation on circuit performance?

A: The STTH3R02Q specifies 3 µA maximum reverse leakage at 200 V. Substitute parts range from 3 µA to 10 µA. Reverse leakage current affects standby power consumption and high-impedance circuit performance. In power supply applications with significant reverse voltage stress, higher leakage (10 µA) may increase standby power loss. In signal rectification or precision measurement circuits, elevated leakage can introduce measurement error. For most general-purpose rectification applications, reverse leakage variation within this range is not critical. Application-specific requirements determine whether leakage current differences are significant.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant status and REACH Unaffected designation. This ensures compliance with current environmental regulations for lead-free manufacturing and restricted substance limitations. All parts feature Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

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