RS3DB-13 Equivalent & Substitute Parts Reference

Part Overview

The RS3DB-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, 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 production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives within acceptable parameter ranges for the intended application category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RS3DB-13 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 200 V or greater to ensure equivalent reverse bias protection.

Current Rating: Substitute parts are grouped into three categories based on average rectified current capacity: 1.5 A (reduced current), 2 A (reduced current), 3 A (equivalent current), and 4 A (increased current). Parts with 3 A rating provide direct functional equivalence. Parts with lower current ratings (1.5 A, 2 A) are suitable only for applications with reduced current requirements. Parts with higher current ratings (4 A) provide enhanced capability.

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

Speed Classification: Fast recovery diodes with reverse recovery time ≤ 500 ns are classified as equivalent. Standard recovery diodes (>500 ns) represent a functional alternative with different switching characteristics.

Forward Voltage: Forward voltage drop at rated current varies among substitutes. Lower forward voltage reduces power dissipation; higher forward voltage increases heat generation.

Compliance Status: RoHS3 compliance status and product lifecycle status (Active, Not For New Designs, Discontinued) are documented for design and procurement planning.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Speed	trr	Package	Product Status	RoHS Status
RS3DB-13	Diodes Incorporated	200 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	150 ns	DO-214AA, SMB	Discontinued	RoHS non-compliant
ER3DB-TP	Micro Commercial Co	200 V	3 A	950 mV @ 3 A	Fast Recovery ≤ 500ns	35 ns	DO-214AA, SMB	Active	ROHS3 Compliant
S3DB-TP	Micro Commercial Co	200 V	3 A	1.15 V @ 3 A	Standard Recovery >500ns	—	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
ES2D	Good-Ark Semiconductor	200 V	2 A	950 mV @ 2 A	Fast Recovery ≤ 500ns	35 ns	DO-214AA, SMB	Active	ROHS3 Compliant
STTH1R02U	STMicroelectronics	200 V	1.5 A	1 V @ 1.5 A	Fast Recovery ≤ 500ns	30 ns	DO-214AA, SMB	Active	ROHS3 Compliant
STTH2R02U	STMicroelectronics	200 V	2 A	1 V @ 2 A	Fast Recovery ≤ 500ns	30 ns	DO-214AA, SMB	Active	ROHS3 Compliant
STTH4R02U	STMicroelectronics	200 V	4 A	1.05 V @ 4 A	Fast Recovery ≤ 500ns	30 ns	DO-214AA, SMB	Active	ROHS3 Compliant
STTH4R02UY	STMicroelectronics	200 V	4 A	1.05 V @ 4 A	Fast Recovery ≤ 500ns	30 ns	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement): ER3DB-TP from Micro Commercial Co is the recommended primary equivalent. It maintains the 200 V / 3 A electrical specification, uses the identical DO-214AA SMB package, and is currently in active product status. ER3DB-TP offers improved performance characteristics with lower forward voltage (950 mV vs. 1.3 V) and faster reverse recovery time (35 ns vs. 150 ns). RoHS3 compliance status provides regulatory advantage for new designs.

Secondary Equivalent (Same Current Rating): S3DB-TP from Micro Commercial Co provides 200 V / 3 A equivalence with RoHS3 compliance. However, this part is designated "Not For New Designs," limiting its suitability for ongoing production. Standard recovery speed (>500 ns) differs from the original fast recovery classification.

Higher Current Alternative: STTH4R02UY from STMicroelectronics provides 200 V / 4 A capability with active product status and RoHS3 compliance. This part is suitable for applications requiring enhanced current capacity or where design margin is required. The automotive-grade designation (Series Q) indicates qualification for automotive environments. Operating temperature range extends to 175°C maximum junction temperature.

Reduced Current Alternatives: STTH2R02U (2 A) and STTH1R02U (1.5 A) from STMicroelectronics are suitable only for applications with lower current requirements. Both maintain 200 V reverse voltage rating, fast recovery speed, and RoHS3 compliance with active product status.

Compliance Consideration: The original RS3DB-13 is RoHS non-compliant. All recommended substitutes are RoHS3 compliant, supporting transition to compliant supply chains.

Frequently Asked Questions (FAQ)

Q: Can ER3DB-TP directly replace RS3DB-13 in existing designs?

A: Yes. ER3DB-TP maintains identical voltage (200 V) and current (3 A) ratings, uses the same DO-214AA SMB package, and provides equivalent surface mount compatibility. The improved performance characteristics (lower forward voltage, faster recovery time) are beneficial for circuit operation.

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

A: Fast recovery diodes (≤ 500 ns reverse recovery time) switch off more quickly, reducing switching losses and electromagnetic interference. Standard recovery diodes (> 500 ns) have slower switching characteristics. The RS3DB-13 specifies fast recovery operation. S3DB-TP uses standard recovery, which may affect high-frequency circuit performance.

Q: Can STTH4R02UY be used in place of RS3DB-13?

A: STTH4R02UY is electrically compatible with 200 V reverse voltage and provides higher current capacity (4 A vs. 3 A). The DO-214AA SMB package is identical. This substitution is suitable for applications where increased current margin is beneficial. The automotive-grade qualification provides additional environmental robustness.

Q: Why do some substitute parts have lower forward voltage?

A: Forward voltage variation reflects differences in semiconductor material quality, doping profiles, and manufacturing processes among manufacturers. Lower forward voltage (ER3DB-TP at 950 mV vs. RS3DB-13 at 1.3 V) reduces power dissipation and heat generation at rated current, improving circuit efficiency.

Q: Is the DO-214AA package identical across all listed parts?

A: Yes. All substitute parts use the DO-214AA (SMB) surface mount package, ensuring identical PCB footprint, solder pad layout, and thermal characteristics. No board redesign is required for mechanical compatibility.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. RoHS3 compliant parts are required for many applications, particularly in consumer electronics and regulated industries. The original RS3DB-13 is RoHS non-compliant; all recommended substitutes are RoHS3 compliant.

Q: Can reduced current parts (STTH2R02U, STTH1R02U) be used in 3 A applications?

A: No. Reduced current parts are rated for maximum 2 A and 1.5 A respectively. Using them in 3 A applications exceeds their current rating, causing excessive heat generation, reduced reliability, and potential failure. These parts are suitable only for applications with lower current requirements.

Q: What is the significance of the automotive-grade designation on STTH4R02UY?

A: The automotive-grade designation (Series Q) indicates the part meets automotive qualification standards for temperature cycling, vibration, and environmental stress. This provides additional assurance for automotive and harsh-environment applications. Non-automotive parts may not meet these requirements.

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