STTH106 Equivalent & Substitute Parts

Part Overview

The STTH106 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within the application's tolerance envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 1 A	V
Reverse Recovery Time (trr)	45	ns
Current - Reverse Leakage @ Vr	1	µA @ 600 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction (Max)	175	°C
Technology	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the STTH106 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: ≤ 1.7 V @ 1 A
Reverse Recovery Time (trr): ≤ 45 ns (fast recovery classification)
Current - Reverse Leakage @ Vr: ≤ 1 µA @ 600 V

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AL (DO-41) or equivalent axial configuration
Operating Temperature - Junction: ≥ 175°C maximum

Parts are grouped into two categories:

Parametric Equivalent: STTH1R06 maintains identical electrical specifications and fast recovery characteristics while offering active product status and improved RoHS compliance.

Similar Substitutes: Parts including 1N3613, 1N4005 variants, 1N4247 variants, and 1N4005G-T provide functional substitution with acceptable parameter variations. These parts maintain 600 V / 1 A ratings and through-hole DO-41 packaging but may differ in forward voltage, recovery speed classification, or reverse leakage characteristics within acceptable application tolerances.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns]	Ir @ 600V [µA]	Speed	Package	Tj (Max) [°C]	Product Status	RoHS
STTH106	STMicroelectronics	600	1	1.7	45	1	Fast Recovery ≤ 500ns	DO-41	175	Obsolete	Non-compliant
STTH1R06	STMicroelectronics	600	1	1.7	45	1	Fast Recovery ≤ 500ns	DO-41	175	Active	ROHS3 Compliant
1N3613	Microchip Technology	600	1	1.1	—	1	Standard Recovery >500ns	Axial	175	Active	Non-compliant
1N4005-E3/53	Vishay General Semiconductor	600	1	1.1	—	5	Standard Recovery >500ns	DO-41	150	Active	ROHS3 Compliant
1N4005-E3/73	Vishay General Semiconductor	600	1	1.1	—	5	Standard Recovery >500ns	DO-41	150	Active	ROHS3 Compliant
1N4005E-E3/53	Vishay General Semiconductor	600	1	1.1	—	5	Fast Recovery ≤ 500ns	DO-41	150	Active	ROHS3 Compliant
1N4005G-T	Diodes Incorporated	600	1	1.0	2000	5	Standard Recovery >500ns	DO-41	175	Active	ROHS3 Compliant
1N4005GHR1G	Taiwan Semiconductor Corporation	600	1	1.0	—	5	Standard Recovery >500ns	DO-41	150	Active	ROHS3 Compliant
1N4005GPE-E3/53	Vishay General Semiconductor	600	1	1.1	2000	5	Standard Recovery >500ns	DO-41	175	Active	ROHS3 Compliant
1N4247GP-E3/54	Vishay General Semiconductor	600	1	1.2	—	1	Standard Recovery >500ns	DO-41	160	Active	ROHS3 Compliant
1N4247GP-E3/73	Vishay General Semiconductor	600	1	1.2	—	1	Standard Recovery >500ns	DO-41	160	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: STTH1R06

The STTH1R06 is the direct parametric equivalent to the STTH106, maintaining identical electrical specifications including 600 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, and 45 ns reverse recovery time. The STTH1R06 is manufactured by STMicroelectronics and carries active product status with ROHS3 compliance, eliminating obsolescence risk and regulatory concerns. This part is the preferred replacement for direct substitution in existing STTH106 applications.

Secondary Selection: 1N4005E-E3/53 or 1N4005GPE-E3/53

For applications where fast recovery characteristics are required, the 1N4005E-E3/53 provides fast recovery operation (≤ 500ns) while maintaining 600 V / 1 A ratings in DO-41 packaging. The 1N4005GPE-E3/53 offers identical fast recovery performance with extended maximum junction temperature (175°C) matching the STTH106. Both parts are ROHS3 compliant and carry active product status. Forward voltage increases to 1.1 V and reverse leakage increases to 5 µA, which are acceptable in most general-purpose rectification applications.

Tertiary Selection: 1N4247GP-E3/54 or 1N4247GP-E3/73

The 1N4247 series provides SUPERECTIFIER® technology with 600 V / 1 A ratings and low reverse leakage (1 µA @ 600 V) matching the STTH106. These parts are ROHS3 compliant and active. Forward voltage is 1.2 V and recovery speed is standard (>500ns). Maximum junction temperature is 160°C, which is lower than the STTH106 specification.

Alternative Selection: 1N4005G-T

The 1N4005G-T from Diodes Incorporated provides 600 V / 1 A ratings with extended maximum junction temperature (175°C) and ROHS3 compliance. Forward voltage is optimized at 1.0 V. Recovery speed is standard (>500ns) with 2 µs reverse recovery time. This part is suitable for applications where lower forward voltage is beneficial.

Compliance Considerations:

All recommended substitute parts carry ROHS3 compliance, addressing regulatory requirements absent in the obsolete STTH106. Selection should prioritize active product status to ensure long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can STTH1R06 be used as a direct replacement for STTH106?

A: Yes. The STTH1R06 is a parametric equivalent with identical electrical specifications: 600 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, 45 ns reverse recovery time, and 1 µA reverse leakage at 600 V. Both use DO-41 through-hole packaging. The STTH1R06 is active and ROHS3 compliant.

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 (trr ≤ 500ns) switch off more quickly, reducing switching losses and noise. Standard recovery diodes (trr >500ns) have slower switching characteristics. The STTH106 specifies fast recovery at 45 ns. Substitutes with standard recovery (1N4005 variants, 1N4247 variants) are acceptable in applications where switching speed is not critical.

Q: Are 1N4005 series diodes compatible with STTH106 applications?

A: The 1N4005 series maintains 600 V / 1 A ratings and DO-41 packaging, making them mechanically compatible. Electrical differences include forward voltage of 1.1 V (versus 1.7 V for STTH106) and reverse leakage of 5 µA (versus 1 µA). These differences are acceptable in general-purpose rectification circuits. The 1N4005E-E3/53 variant provides fast recovery characteristics matching the STTH106's speed classification.

Q: What does RoHS compliance mean for component selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part does not contain restricted materials including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. ROHS3 compliance is required for many applications and markets. The STTH106 is RoHS non-compliant; all recommended substitutes are ROHS3 compliant.

Q: Can I use a 1N4247 instead of STTH106?

A: Yes, with parameter awareness. The 1N4247 maintains 600 V / 1 A ratings and DO-41 packaging. Forward voltage is 1.2 V (higher than STTH106's 1.7 V), and reverse leakage is 1 µA (matching STTH106). Recovery speed is standard (>500ns), not fast recovery. Maximum junction temperature is 160°C, lower than STTH106's 175°C. The 1N4247 is suitable for applications where fast recovery is not required and lower operating temperature is acceptable.

Q: What is the significance of reverse leakage current?

A: Reverse leakage current (Ir) is the small current that flows through a reverse-biased diode. Lower leakage current indicates better diode quality and lower power dissipation in the reverse-biased state. The STTH106 specifies 1 µA at 600 V. Substitutes with 5 µA leakage (1N4005 variants) have five times higher leakage but remain acceptable in most applications. The 1N4247 and 1N3613 match the 1 µA specification.

Q: Does forward voltage affect circuit performance?

A: Forward voltage (Vf) is the voltage drop across a conducting diode. Higher forward voltage increases power dissipation and reduces circuit efficiency. The STTH106 specifies 1.7 V at 1 A. Substitutes with lower forward voltage (1N4005G-T at 1.0 V, 1N4005 variants at 1.1 V) reduce power loss. In high-current or efficiency-critical applications, lower forward voltage is preferable. In general-purpose rectification, the difference is often negligible.

Q: Are axial and DO-41 packages interchangeable?

A: Axial and DO-41 (DO-204AL) packages are physically different. Axial packages have leads extending from opposite ends of the component body, while DO-41 packages have leads extending from the same end. These packages are not mechanically interchangeable on circuit boards. The STTH106 uses DO-41 packaging. Substitutes must also use DO-41 or equivalent DO-204AL packaging. The 1N3613 uses axial packaging and is not mechanically compatible.

Q: What is the impact of maximum junction temperature rating?

A: Maximum junction temperature (Tj) is the highest temperature the diode junction can withstand without degradation. The STTH106 specifies 175°C. Substitutes with lower ratings (1N4005 variants at 150°C, 1N4247 at 160°C) have reduced thermal headroom. In applications with elevated ambient temperatures or high power dissipation, parts with higher Tj ratings are preferable. The STTH1R06 and 1N4005GPE-E3/53 match the 175°C specification.

Q: How do I verify a substitute part is suitable for my application?

A: Compare the substitute part's electrical parameters against your circuit's requirements: (1) Verify reverse voltage rating meets or exceeds your circuit's maximum reverse bias voltage; (2) Verify average rectified current rating meets or exceeds your circuit's maximum forward current; (3) Confirm forward voltage drop is acceptable for your power budget; (4) Confirm recovery speed meets your switching frequency requirements; (5) Verify package and mounting type match your PCB design; (6) Confirm maximum junction temperature is adequate for your thermal environment.

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