Equivalent & Substitute Parts for S3DB-13

Part Overview

The S3DB-13 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 3 A average rectified current in a surface mount SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design support and procurement. The part operates across a junction temperature range of -65°C to 150°C and exhibits standard recovery characteristics with a maximum forward voltage of 1.15 V at 3 A.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15	V @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Capacitance @ Vr, F	40	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the S3DB-13 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 200 V to ensure equivalent circuit protection and reliability.

Current Rating: Substitute parts are grouped into three categories based on average rectified current capacity: parts rated at 1.5 A (reduced current), 3 A (direct equivalent), and 4 A (increased current capacity). Parts with lower current ratings (1.5 A) are suitable only for applications with reduced current demands. Parts with equal or higher current ratings (3 A or 4 A) provide direct substitution or enhanced capability.

Package and Mounting: All substitute parts use the DO-214AA SMB surface mount package, ensuring mechanical and electrical compatibility with the original design footprint.

Recovery Characteristics: Substitute parts are available in both standard recovery (>500 ns) and fast recovery (≤500 ns) configurations. Fast recovery variants offer improved switching performance but are not required for standard applications.

Compliance Status: RoHS3 compliance is available in multiple substitute options, addressing regulatory requirements not met by the original S3DB-13 part.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	Reverse Leakage [µA]	Package	Product Status	RoHS Status
S3DB-13	Diodes Incorporated	200	3	1.15 @ 3A	Standard >500ns	10 @ 200V	DO-214AA, SMB	Discontinued	Non-compliant
S3DB-13-F	Diodes Incorporated	200	3	1.15 @ 3A	Standard >500ns	10 @ 200V	DO-214AA, SMB	Active	ROHS3 Compliant
S3DB-TP	Micro Commercial Co	200	3	1.15 @ 3A	Standard >500ns	10 @ 200V	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
ER3DB-TP	Micro Commercial Co	200	3	0.95 @ 3A	Fast ≤500ns	5 @ 200V	DO-214AA, SMB	Active	ROHS3 Compliant
STTH1R02U	STMicroelectronics	200	1.5	1.0 @ 1.5A	Fast ≤500ns	3 @ 200V	DO-214AA, SMB	Active	ROHS3 Compliant
STTH2R02U	STMicroelectronics	200	2	1.0 @ 2A	Fast ≤500ns	3 @ 200V	DO-214AA, SMB	Active	ROHS3 Compliant
STTH4R02U	STMicroelectronics	200	4	1.05 @ 4A	Fast ≤500ns	3 @ 200V	DO-214AA, SMB	Active	ROHS3 Compliant
STTH4R02UY	STMicroelectronics	200	4	1.05 @ 4A	Fast ≤500ns	3 @ 200V	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent with Compliance Upgrade: The S3DB-13-F from Diodes Incorporated provides identical electrical specifications to the original S3DB-13 while offering ROHS3 compliance and active product status. This part is the primary recommendation for direct replacement in existing designs.

Alternative Direct Equivalent: The ER3DB-TP from Micro Commercial Co maintains the 200 V / 3 A rating with improved performance characteristics including fast recovery (≤500 ns), lower forward voltage (0.95 V), and reduced reverse leakage (5 µA). This part is suitable for applications where enhanced switching performance is beneficial.

Current-Rated Alternatives: The STTH series from STMicroelectronics offers multiple current ratings (1.5 A, 2 A, 4 A) with consistent 200 V reverse voltage ratings. The STTH4R02U and STTH4R02UY provide increased current capacity (4 A) with fast recovery characteristics and are suitable for applications requiring higher current handling. The STTH4R02UY includes automotive-grade qualification and extended temperature range (-40°C to 175°C).

Legacy Consideration: The S3DB-TP from Micro Commercial Co is marked as "Not For New Designs" and should be avoided for new development projects despite its electrical equivalence.

All recommended substitute parts are ROHS3 compliant and maintain active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the S3DB-13-F be used as a direct replacement for the S3DB-13?

A: Yes. The S3DB-13-F is electrically and mechanically identical to the S3DB-13, with the primary difference being ROHS3 compliance and active product status. Both parts share identical voltage ratings (200 V), current ratings (3 A), forward voltage characteristics (1.15 V @ 3 A), and package specifications (DO-214AA, SMB).

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

A: Standard recovery diodes exhibit recovery times greater than 500 ns, while fast recovery diodes exhibit recovery times of 500 ns or less. Fast recovery variants, such as the ER3DB-TP and STTH series, provide improved switching performance and reduced reverse leakage current. Selection depends on circuit switching frequency requirements.

Q: Can I use the STTH1R02U or STTH2R02U as substitutes for the S3DB-13?

A: The STTH1R02U (1.5 A) and STTH2R02U (2 A) have lower current ratings than the S3DB-13 (3 A). These parts are suitable only for applications where the actual circuit current demand does not exceed their respective ratings. They maintain the 200 V reverse voltage rating and offer improved performance characteristics (fast recovery, lower forward voltage, reduced leakage).

Q: Is the STTH4R02UY suitable for automotive applications?

A: Yes. The STTH4R02UY is qualified as an automotive-grade component (Grade: Automotive) with an extended operating temperature range of -40°C to 175°C. The standard STTH4R02U lacks automotive qualification but shares identical electrical specifications.

Q: What packaging options are available for substitute parts?

A: All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring compatibility with the original S3DB-13 footprint. Packaging formats vary between manufacturers: Diodes Incorporated and Micro Commercial Co offer Tape & Reel (TR) options, while STMicroelectronics offers Cut Tape (CT) and Digi-Reel® formats.

Q: Why is RoHS compliance important for this substitution?

A: The original S3DB-13 is RoHS non-compliant. Many substitute parts offer ROHS3 compliance, which is required for products sold into regulated markets and for compliance with environmental directives. ROHS3 compliance ensures the part meets current regulatory standards for hazardous substance restrictions.

Q: Can I substitute a higher-rated current part (4 A) for the 3 A S3DB-13?

A: Yes. The STTH4R02U and STTH4R02UY are rated for 4 A average rectified current, providing increased current capacity while maintaining the 200 V reverse voltage rating. These parts are suitable for applications where the circuit current demand does not exceed 4 A, and they offer improved performance characteristics compared to the original part.

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