STTH108RL Equivalent & Substitute Parts

Part Overview

The STTH108RL is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 800 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 equivalent and substitute components for ongoing design requirements and procurement needs. Active alternatives with identical or compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.65 V @ 1 A
Reverse Recovery Time (trr)	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction (Max)	175°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the STTH108RL is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) must equal or exceed 800 V
Current - Average Rectified (Io) must equal or exceed 1 A
Reverse Recovery Time (trr) must be ≤ 500 ns (fast recovery classification)
Current - Reverse Leakage @ Vr must not exceed 5 µA @ 800 V

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial configurations
Operating Temperature - Junction capability: 175°C or higher

Compliance Requirements:

RoHS3 Compliant status
REACH Unaffected status

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents – Parts with identical electrical specifications and active product status, differing only in packaging format or manufacturer.

Category 2: Functional Substitutes – Parts meeting or exceeding all critical electrical parameters with compatible through-hole packaging, accommodating minor variations in forward voltage, reverse leakage, or recovery time within acceptable operating margins.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr (ns)	Ir @ Vr	Speed	Package	Status
STTH108RL	STMicroelectronics	800 V	1 A	1.65 V @ 1 A	75	5 µA @ 800 V	Fast Recovery ≤ 500ns	DO-41	Obsolete
STTH108	STMicroelectronics	800 V	1 A	1.65 V @ 1 A	75	5 µA @ 800 V	Fast Recovery ≤ 500ns	DO-41	Active
STTH110	STMicroelectronics	1000 V	1 A	1.7 V @ 1 A	75	10 µA @ 1000 V	Fast Recovery ≤ 500ns	DO-41	Active
1N4006-E3/53	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.1 V @ 1 A	—	5 µA @ 800 V	Standard Recovery >500ns	DO-204AL (DO-41)	Active
1N4006-E3/54	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.1 V @ 1 A	—	5 µA @ 800 V	Standard Recovery >500ns	DO-204AL (DO-41)	Active
1N4248GP-E3/54	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.2 V @ 1 A	—	1 µA @ 800 V	Standard Recovery >500ns	DO-204AL (DO-41)	Active
1N4248GP-E3/73	Vishay General Semiconductor - Diodes Division	800 V	1 A	1.2 V @ 1 A	—	1 µA @ 800 V	Standard Recovery >500ns	DO-204AL (DO-41)	Active
1N4947GP-AP	Micro Commercial Co	800 V	1 A	1.3 V @ 1 A	250	5 µA @ 800 V	Fast Recovery ≤ 500ns	DO-41	Active
1N4947GP-TP	Micro Commercial Co	800 V	1 A	1.3 V @ 1 A	250	5 µA @ 800 V	Fast Recovery ≤ 500ns	DO-41	Active
BYT54K-TAP	Vishay General Semiconductor - Diodes Division	800 V	1.25 A	1.5 V @ 1 A	100	5 µA @ 800 V	Fast Recovery ≤ 500ns	SOD-57	Active

Engineering Selection Recommendations

Direct Parametric Equivalent (Recommended Primary Choice):

STTH108 is the active equivalent of STTH108RL, manufactured by STMicroelectronics with identical electrical specifications (800 V, 1 A, 75 ns recovery time, 1.65 V forward voltage). This part maintains full compatibility with the obsolete STTH108RL and is available in active product status with 10,400 units in stock.

Fast Recovery Alternatives (Compatible with Fast Recovery Applications):

1N4947GP-AP and 1N4947GP-TP (Micro Commercial Co) provide fast recovery characteristics (≤ 500ns) with 800 V / 1 A ratings. These parts feature slightly higher forward voltage (1.3 V @ 1 A) and longer recovery time (250 ns) compared to STTH108RL but remain within fast recovery classification. Both are available in DO-41 packaging with active product status.

Standard Recovery Alternatives (For Non-Critical Recovery Time Applications):

1N4006-E3/53, 1N4006-E3/54 (Vishay) and 1N4248GP-E3/54, 1N4248GP-E3/73 (Vishay) meet the 800 V / 1 A electrical requirements with standard recovery characteristics (>500ns). These parts feature lower forward voltage (1.1 V to 1.2 V @ 1 A) and reduced reverse leakage (1 µA for 1N4248 series). All are available in DO-204AL (DO-41) packaging with active product status.

Higher Voltage Alternative:

STTH110 (STMicroelectronics) provides 1000 V reverse voltage rating with identical 1 A current and 75 ns recovery time. This part is suitable for applications requiring higher voltage margin and is available in active status with 52,288 units in stock.

Higher Current Alternative:

BYT54K-TAP (Vishay) provides 1.25 A average rectified current at 800 V with fast recovery characteristics (100 ns). This part is available in SOD-57 through-hole packaging and is suitable for applications requiring current margin above 1 A.

All recommended substitutes are RoHS3 Compliant and REACH Unaffected, matching the compliance status of the original STTH108RL.

Frequently Asked Questions (FAQ)

Q: Can STTH108 directly replace STTH108RL?

A: Yes. STTH108 is the active parametric equivalent with identical electrical specifications (800 V, 1 A, 75 ns recovery time, 1.65 V forward voltage @ 1 A) and compatible DO-41 through-hole packaging. The primary difference is product status (Active vs. Obsolete) and packaging format (bulk vs. tape & reel).

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

A: Recovery speed is determined by reverse recovery time (trr). STTH108RL specifies fast recovery with trr ≤ 500ns. Standard recovery diodes have trr >500ns. Fast recovery diodes are required in high-frequency switching applications; standard recovery diodes are acceptable in lower-frequency rectification circuits. Selection depends on circuit operating frequency and switching requirements.

Q: Can I use 1N4006-E3/54 instead of STTH108RL?

A: 1N4006-E3/54 meets the 800 V / 1 A electrical requirements and is available in compatible DO-204AL (DO-41) packaging. However, it is classified as standard recovery (>500ns) rather than fast recovery (≤ 500ns). This substitution is acceptable only if the application does not require fast recovery characteristics. The 1N4006 series features lower forward voltage (1.1 V @ 1 A) compared to STTH108RL (1.65 V @ 1 A).

Q: What is the advantage of 1N4248GP series over 1N4006 series?

A: Both 1N4248GP and 1N4006 are standard recovery diodes rated 800 V / 1 A in DO-204AL (DO-41) packaging. The 1N4248GP series (SUPERECTIFIER®) features lower reverse leakage current (1 µA @ 800 V vs. 5 µA @ 800 V) and lower capacitance (8pF vs. 15pF @ 4V, 1MHz). The 1N4248GP also supports extended operating temperature range (-65°C to 160°C vs. -50°C to 150°C). Selection depends on leakage current and temperature requirements.

Q: Why would I choose BYT54K-TAP over STTH108RL?

A: BYT54K-TAP provides higher current rating (1.25 A vs. 1 A) at the same 800 V voltage with fast recovery characteristics (100 ns). This part is suitable for applications requiring current margin or higher power dissipation capability. BYT54K-TAP is packaged in SOD-57 (through-hole axial) format, which is mechanically compatible with DO-41 applications but differs in physical dimensions.

Q: Is STTH110 a suitable replacement for STTH108RL?

A: STTH110 is electrically compatible with identical 1 A current and 75 ns recovery time. The primary difference is higher reverse voltage rating (1000 V vs. 800 V). STTH110 is suitable for applications where higher voltage margin is beneficial or required. Forward voltage is slightly higher (1.7 V @ 1 A vs. 1.65 V @ 1 A). Both are manufactured by STMicroelectronics with active product status.

Q: What packaging formats are available for substitutes?

A: Substitute parts are available in the following through-hole configurations: DO-41 (axial leads), DO-204AL (axial leads, equivalent to DO-41), and SOD-57 (axial leads). All are mechanically compatible with through-hole PCB designs. Tape & Reel (TR) and Cut Tape (CT) packaging options are available for automated assembly; Bulk packaging is available for manual assembly. Packaging format selection depends on assembly process requirements.

Q: Are all substitute parts RoHS3 Compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 Compliant and REACH Unaffected, matching the compliance status of STTH108RL. This ensures compatibility with current environmental and regulatory requirements.

Q: What is the difference between 1N4947GP-AP and 1N4947GP-TP?

A: Both parts are identical in electrical specifications (800 V, 1 A, 250 ns recovery time, 1.3 V forward voltage @ 1 A) and package type (DO-41). The difference is packaging format: 1N4947GP-AP is supplied in bulk; 1N4947GP-TP is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements.

Q: Can I use 1N6623U as a substitute?

A: 1N6623U meets the 800 V voltage and exceeds the 1 A current requirement (1.5 A rating). However, this part is a surface-mount device in SQ-MELF package, not a through-hole component. It is not mechanically compatible with through-hole PCB designs requiring DO-41 or DO-204AL packages. 1N6623U is suitable only for surface-mount applications.

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