STTH802B Equivalent & Substitute Parts

Part Overview

The STTH802B is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 8 A average rectified current in a surface mount DPAK package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical and mechanical compatibility while meeting current product availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.05	V @ 8 A
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	6	µA @ 200 V
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature - Junction (Max)	175	°C
Technology	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitute parts for the STTH802B are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 8 A minimum
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount
Technology: Standard rectifier diode

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Within acceptable operating range
Reverse Recovery Time (trr): Fast recovery classification
Current - Reverse Leakage @ Vr: Acceptable leakage characteristics
Operating Temperature - Junction: Thermal performance envelope

Parts meeting all primary criteria and maintaining secondary parameter compatibility are classified as direct substitutes.

Parameter Comparison

Parameter	STTH802B	STTH802B-TR	SDURD820
Manufacturer	STMicroelectronics	STMicroelectronics	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V
Current - Average Rectified (Io)	8 A	8 A	8 A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 8 A	1.05 V @ 8 A	1.2 V @ 8 A
Reverse Recovery Time (trr)	30 ns	30 ns	35 ns
Current - Reverse Leakage @ Vr	6 µA @ 200 V	6 µA @ 200 V	5 µA @ 200 V
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	175°C (Max)	175°C (Max)	−55°C ~ 150°C
Technology	Standard	Standard	Standard
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

STTH802B-TR (STMicroelectronics)

The STTH802B-TR is the direct equivalent of the obsolete STTH802B, manufactured by the same supplier. This part maintains identical electrical specifications including voltage rating, current capacity, forward voltage drop, and reverse recovery time. The STTH802B-TR is classified as Active product status, ensuring long-term availability and supply chain continuity. Packaging is specified as Cut Tape (CT) and Digi-Reel®, providing standard manufacturing formats. Moisture sensitivity is improved to MSL 1 (Unlimited) compared to the original part's MSL 3 (168 Hours). ROHS3 compliance and REACH Unaffected status are maintained. This part is the preferred substitute for direct replacement applications.

SDURD820 (SMC Diode Solutions)

The SDURD820 qualifies as a functional substitute, meeting all primary electrical and mechanical substitution criteria. Voltage and current ratings are identical to the STTH802B. Forward voltage is specified at 1.2 V @ 8 A, representing a 0.15 V increase compared to the original part. Reverse recovery time is 35 ns, a 5 ns increase from the original specification. Reverse leakage current is 5 µA @ 200 V, representing improved leakage performance. Operating temperature range is −55°C to 150°C, with a maximum junction temperature of 150°C compared to the original 175°C maximum. The part is classified as Active product status with MSL 1 (Unlimited) moisture sensitivity. ROHS3 compliance is maintained; however, REACH Status is listed as Affected. This part is suitable for applications where the specified parameter variations are acceptable within circuit design margins.

Frequently Asked Questions (FAQ)

Q: Can STTH802B-TR be used as a direct replacement for STTH802B?

A: Yes. The STTH802B-TR is manufactured by STMicroelectronics and maintains identical electrical specifications for voltage rating (200 V), current capacity (8 A), forward voltage drop (1.05 V @ 8 A), and reverse recovery time (30 ns). Package and mounting type are identical. The STTH802B-TR is classified as Active product status, providing supply continuity for the obsolete STTH802B.

Q: What are the key differences between STTH802B-TR and SDURD820?

A: Both parts meet the primary substitution criteria of 200 V voltage rating, 8 A current capacity, and DPAK surface mount packaging. Differences include: forward voltage (STTH802B-TR: 1.05 V vs. SDURD820: 1.2 V @ 8 A), reverse recovery time (STTH802B-TR: 30 ns vs. SDURD820: 35 ns), maximum junction temperature (STTH802B-TR: 175°C vs. SDURD820: 150°C), and REACH compliance status (STTH802B-TR: Unaffected vs. SDURD820: Affected). The STTH802B-TR provides closer electrical matching to the original part.

Q: Is the DPAK package identical across all three parts?

A: Yes. All three parts use the TO-252-3, DPAK (2 Leads + Tab), SC-63 package with surface mount mounting type. PCB layout and assembly processes remain unchanged when substituting between these parts.

Q: What is the significance of MSL rating differences?

A: The original STTH802B specifies MSL 3 (168 Hours), requiring controlled moisture exposure during storage and handling. Both substitute parts specify MSL 1 (Unlimited), eliminating moisture sensitivity constraints. This represents an improvement in handling and storage flexibility for substitute parts.

Q: Are there compliance considerations when selecting a substitute?

A: All three parts are ROHS3 compliant. The STTH802B and STTH802B-TR are REACH Unaffected, while SDURD820 is REACH Affected. Applications subject to REACH regulations should confirm compatibility with the SDURD820 before selection.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage specifications are provided at rated current (8 A). The STTH802B-TR maintains 1.05 V @ 8 A, identical to the original. The SDURD820 specifies 1.2 V @ 8 A, a 0.15 V increase. This difference affects power dissipation and thermal performance in the rectifier circuit. Circuit design margins must accommodate this variation if SDURD820 is selected.

Q: What is the impact of reverse recovery time differences?

A: The STTH802B and STTH802B-TR specify 30 ns reverse recovery time. The SDURD820 specifies 35 ns. Both parts are classified as fast recovery diodes. The 5 ns difference may affect switching performance in high-frequency applications. Circuit analysis is required to determine acceptability in specific applications.

Q: Can SDURD820 be used in applications requiring 175°C maximum junction temperature?

A: No. The SDURD820 specifies a maximum junction temperature of 150°C, compared to 175°C for the STTH802B and STTH802B-TR. Applications requiring thermal operation above 150°C must use STTH802B-TR. Thermal analysis is required to confirm operating junction temperature in the target application.

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