Equivalent & Substitute Parts for RS1KB-13

Part Overview

The RS1KB-13 is a general-purpose rectifier diode rated for 800 V DC reverse voltage and 1 A average rectified current in a Surface Mount SMB (DO-214AA) package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified performance characteristics within acceptable application parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution of the RS1KB-13 is determined by the following critical parameters: DC reverse voltage rating (800 V minimum), package type (DO-214AA SMB surface mount), mounting compatibility, and reverse recovery time classification (fast recovery ≤ 500 ns).

Direct Equivalent (Packaging Variant): RS1KB-13-F maintains identical electrical specifications and differs only in packaging format (Tape & Reel versus bulk), making it a direct functional equivalent.

Functional Substitute (Upgraded Current Rating): STTH208U provides the same 800 V reverse voltage rating and SMB package footprint but with doubled average rectified current (2 A versus 1 A) and improved reverse recovery time (75 ns versus 500 ns). This substitute is suitable for applications where the original 1 A rating is adequate and the enhanced performance characteristics do not create design conflicts.

Parameter Comparison

Parameter	RS1KB-13	RS1KB-13-F	STTH208U
Manufacturer	Diodes Incorporated	Diodes Incorporated	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	1 A	1 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.65 V @ 2 A
Reverse Recovery Time (trr)	500 ns	500 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	150°C	150°C	175°C
Product Status	Discontinued at DiGi Electronics	Active	Active
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: RS1KB-13-F is the primary equivalent, offering identical electrical performance with active product status and ROHS3 compliance. This part is recommended when packaging format (Tape & Reel) is compatible with procurement and assembly processes.

For Functional Substitution: STTH208U is suitable for applications where the 1 A current rating of the original part provides design margin. The doubled current rating (2 A) and significantly improved reverse recovery time (75 ns) present no functional degradation in circuits designed for the RS1KB-13. Both substitute options maintain the 800 V reverse voltage specification and SMB package footprint. STTH208U provides additional benefits of higher maximum junction temperature (175°C) and ROHS3 compliance.

Compliance Considerations: Both active alternatives (RS1KB-13-F and STTH208U) are ROHS3 compliant, addressing regulatory requirements that may be unmet by the discontinued RS1KB-13.

Frequently Asked Questions (FAQ)

Q: Can RS1KB-13-F be used as a direct replacement for RS1KB-13?

A: Yes. RS1KB-13-F is electrically and mechanically identical to RS1KB-13. The difference is packaging format: RS1KB-13-F is supplied in Tape & Reel format while RS1KB-13 was supplied in bulk. Both maintain identical electrical specifications and SMB package footprint.

Q: What are the key differences between RS1KB-13 and STTH208U?

A: STTH208U differs in three parameters: average rectified current (2 A versus 1 A), reverse recovery time (75 ns versus 500 ns), and maximum junction temperature (175°C versus 150°C). The 800 V reverse voltage rating and SMB package are identical. STTH208U is suitable for applications where the original 1 A rating is adequate.

Q: Are there any thermal or power dissipation concerns when substituting with STTH208U?

A: Forward voltage at rated current differs between parts (1.3 V @ 1 A for RS1KB-13 versus 1.65 V @ 2 A for STTH208U). Power dissipation must be calculated based on actual circuit current. At the original 1 A operating point, STTH208U dissipates approximately 1.65 W compared to 1.3 W for RS1KB-13. Thermal design must accommodate this difference.

Q: Is the SMB package footprint identical across all three parts?

A: Yes. All three parts (RS1KB-13, RS1KB-13-F, and STTH208U) use the DO-214AA SMB package with identical mechanical dimensions and PCB footprint.

Q: Which substitute part should be selected for new designs?

A: RS1KB-13-F is recommended for designs requiring exact electrical equivalence. STTH208U is recommended for designs where improved reverse recovery time and higher current rating provide system benefits without design conflicts.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both RS1KB-13-F and STTH208U are ROHS3 compliant. The original RS1KB-13 is RoHS non-compliant.

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