US1K-13 Equivalent & Substitute Parts

Part Overview

The US1K-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 800 V DC reverse voltage and 1 A average rectified current in a surface mount SMA (DO-214AC) package. This part is classified as discontinued at DiGi Electronics, which necessitates identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for this rectifier diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 1 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the US1K-13 is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Range 1.0 V to 1.7 V @ 1 A
Reverse Recovery Time (trr): 75 ns to 500 ns
Current - Reverse Leakage @ Vr: 5 µA to 10 µA @ 800 V
Operating Temperature - Junction (Max): 150°C or higher
Speed Classification: Standard Recovery or Fast Recovery

Parts are grouped into three categories: direct equivalents (identical specifications), active substitutes (functionally compatible with minor parameter variations), and legacy substitutes (not recommended for new designs but electrically compatible).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns]	Ir @ 800V [µA]	Package	Product Status	RoHS Status
US1K-13	Diodes Incorporated	800	1	1.7	75	5	DO-214AC, SMA	Discontinued	Non-compliant
US1K-13-F	Diodes Incorporated	800	1	1.7	75	5	DO-214AC, SMA	Active	ROHS3 Compliant
STTH108A	STMicroelectronics	800	1	1.65	75	5	DO-214AC, SMA	Active	ROHS3 Compliant
GS1K-LTP	Micro Commercial Co	800	1	1.0	—	10	DO-214AC, SMA	Active	ROHS3 Compliant
HS1K	Good-Ark Semiconductor	800	1	1.7	75	5	DO-214AC, SMA	Active	ROHS3 Compliant
MRA4006T3G	onsemi	800	1	1.1	—	10	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
RGF1K	onsemi	800	1	1.3	500	5	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
RS1K	Fairchild Semiconductor	800	1	1.3	500	5	DO-214AC, SMA	Active	—
RS1K-E3/5AT	Vishay General Semiconductor - Diodes Division	800	1	1.3	500	5	DO-214AC, SMA	Active	ROHS3 Compliant
RS1K-E3/61T	Vishay General Semiconductor - Diodes Division	800	1	1.3	500	5	DO-214AC, SMA	Active	ROHS3 Compliant
S1K	YAGEO	—	—	—	—	—	—	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Replacement):

US1K-13-F (Diodes Incorporated) is the direct equivalent replacement for US1K-13. This part maintains identical electrical specifications (800 V, 1 A, 1.7 V forward voltage, 75 ns recovery time) and mechanical packaging (DO-214AC, SMA). The primary distinction is product status: US1K-13-F is active with ROHS3 compliance, whereas the original US1K-13 is discontinued and RoHS non-compliant. Inventory availability for US1K-13-F is 125,400 pieces.

Active Substitutes (Functionally Compatible):

STTH108A (STMicroelectronics) provides equivalent performance with marginally lower forward voltage (1.65 V vs. 1.7 V) and identical recovery characteristics. This part is active with ROHS3 compliance and 80,200 pieces in stock.

HS1K (Good-Ark Semiconductor) matches all critical electrical parameters of the original part, including 1.7 V forward voltage and 75 ns recovery time. Product status is active with ROHS3 compliance and 2,600 pieces available.

RS1K-E3/61T and RS1K-E3/5AT (Vishay General Semiconductor - Diodes Division) are active substitutes with 1.3 V forward voltage and 500 ns recovery time. Both are ROHS3 compliant with substantial inventory (174,300 and 7,378 pieces respectively).

RS1K (Fairchild Semiconductor) is an active substitute with 1.3 V forward voltage and 500 ns recovery time. Inventory is 106,700 pieces.

Acceptable Substitutes with Parameter Variations:

GS1K-LTP (Micro Commercial Co) operates at 800 V, 1 A with lower forward voltage (1.0 V) and higher reverse leakage (10 µA). Product status is active with ROHS3 compliance and 8,458 pieces in stock.

MRA4006T3G (onsemi) provides 800 V, 1 A operation with 1.1 V forward voltage and 10 µA reverse leakage. Product status is "Not For New Designs" with ROHS3 compliance and 45,300 pieces available.

Legacy Substitutes (Not Recommended for New Designs):

RGF1K (onsemi) is classified as "Not For New Designs" despite active inventory (39,900 pieces) and ROHS3 compliance. This part exhibits 500 ns recovery time versus the original 75 ns specification.

Compliance Considerations:

The original US1K-13 is RoHS non-compliant. All recommended active substitutes (US1K-13-F, STTH108A, HS1K, RS1K-E3/61T, RS1K-E3/5AT) are ROHS3 compliant, supporting transition to compliant supply chains. All parts maintain EAR99 export classification and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can US1K-13-F be used as a direct replacement for US1K-13?

A: Yes. US1K-13-F is the direct equivalent with identical electrical specifications (800 V, 1 A, 1.7 V forward voltage, 75 ns recovery time) and DO-214AC SMA packaging. The primary difference is product status and RoHS compliance. US1K-13-F is active and ROHS3 compliant.

Q: What is the difference between fast recovery (75 ns) and standard recovery (500 ns) diodes?

A: Recovery time (trr) indicates the duration required for a diode to transition from conducting to blocking state. Fast recovery diodes (≤500 ns, >200 mA) switch more rapidly, reducing switching losses in high-frequency applications. Standard recovery diodes (>500 ns) are suitable for lower-frequency rectification. The original US1K-13 specifies 75 ns fast recovery. Substitutes with 500 ns recovery time (RS1K series, RGF1K) are acceptable for applications where switching speed is not critical.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitutes use DO-214AC SMA surface mount packaging, maintaining mechanical compatibility with the original US1K-13 footprint and assembly process.

Q: What is the significance of forward voltage (Vf) variation among substitutes?

A: Forward voltage ranges from 1.0 V (GS1K-LTP) to 1.7 V (US1K-13, HS1K). Lower forward voltage reduces power dissipation and heat generation during conduction. Higher forward voltage increases dissipation. Selection depends on thermal budget and efficiency requirements. The original specification of 1.7 V is maintained by US1K-13-F and HS1K.

Q: Why is MRA4006T3G marked "Not For New Designs"?

A: This designation indicates the manufacturer (onsemi) has classified this part as legacy or obsolescence-pending. While electrically compatible and currently in stock (45,300 pieces), new designs should prioritize active parts such as US1K-13-F, STTH108A, or RS1K-E3/61T to ensure long-term supply continuity.

Q: What is the difference between reverse leakage current specifications of 5 µA and 10 µA?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. Lower leakage (5 µA) indicates better blocking characteristics and lower standby power consumption. Higher leakage (10 µA) is acceptable in most applications but may increase power dissipation in high-impedance circuits. The original US1K-13 specifies 5 µA. Substitutes with 10 µA leakage (GS1K-LTP, MRA4006T3G) are functionally compatible for standard rectification applications.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is required for products sold in the European Union and many other jurisdictions. The original US1K-13 is RoHS non-compliant. All recommended active substitutes (US1K-13-F, STTH108A, HS1K, RS1K-E3/61T, RS1K-E3/5AT) are ROHS3 compliant, supporting regulatory requirements and supply chain transitions.

Q: Can I use S1K as a substitute?

A: S1K (YAGEO) is listed as active with ROHS3 compliance and 5,824 pieces in stock. However, detailed electrical specifications are not provided in the available data. Verification of electrical parameters against application requirements is necessary before selection.

Q: What inventory levels should I consider for long-term supply?

A: US1K-13-F offers the highest inventory (125,400 pieces), followed by RS1K-E3/61T (174,300 pieces) and RS1K (106,700 pieces). These high inventory levels support sustained production requirements. Parts with lower inventory (HS1K: 2,600 pieces, RS1K-E3/5AT: 7,378 pieces) may require longer lead times for large volume orders.

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