US1M Equivalent & Substitute Parts

Part Overview

The US1M is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 1000 V DC reverse voltage and 1 A average rectified current in a Surface Mount SMA (DO-214AC) package. The device features fast recovery characteristics with a reverse recovery time of 75 ns and operates across a junction temperature range of -65°C to 150°C.

The US1M is classified as Obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.7	V @ 1 A
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the US1M are grouped based on electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA (Surface Mount)
Mounting Type: Surface Mount

Secondary Parameters Affecting Compatibility:

Voltage - Forward (Vf) (Max) @ If: 1.7 V @ 1 A (or lower)
Reverse Recovery Time (trr): 75 ns (or lower)
Current - Reverse Leakage @ Vr: 5 µA @ 1000 V (or lower)
Operating Temperature - Junction: -65°C ~ 150°C (or wider range)

Parts meeting all critical parameters and maintaining secondary parameter specifications within acceptable tolerances are classified as direct equivalents or functional substitutes. Variations in forward voltage, reverse recovery time, and leakage current are documented to support design validation and thermal analysis.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
US1M	Diodes Incorporated	1000	1	1.7 @ 1 A	75	5 @ 1000 V	DO-214AC, SMA	-65 to 150	Obsolete
US1M-13-F	Diodes Incorporated	1000	1	1.7 @ 1 A	75	5 @ 1000 V	DO-214AC, SMA	-65 to 150	Active
UA1M	SMC Diode Solutions	1000	1	1.7 @ 1 A	75	3 @ 1000 V	DO-214AC, SMA	-55 to 150	Active
CURA107-G	Comchip Technology	1000	1	1.7 @ 1 A	75	5 @ 1000 V	DO-214AC, SMA	—	Active
FS1M-LTP	Micro Commercial Co	1000	1	1.3 @ 1 A	500	5 @ 1000 V	DO-214AC, SMA	-50 to 150	Active
RS1M	EVVO Semi	1000	1	1.3 @ 1 A	500	5 @ 1 kV	DO-214AC, SMA	-55 to 150	Active
US1M	EVVO Semi	1000	1	1.65 @ 1 A	75	5 @ 1 kV	DO-214AC, SMA	-55 to 150	Active
US1M_R1_00001	Panjit International Inc.	1000	1	1.7 @ 1 A	100	1 @ 1000 V	DO-214AC, SMA	-55 to 150	Active

Engineering Selection Recommendations

Recommended Primary Substitute: US1M-13-F (Diodes Incorporated)

The US1M-13-F is the direct parametric equivalent to the obsolete US1M. Manufactured by the same supplier (Diodes Incorporated), this part maintains identical electrical specifications including 1000 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, and 75 ns reverse recovery time. The US1M-13-F carries Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). This part is available in Cut Tape and Digi-Reel packaging formats with 935,300 units in stock, providing supply continuity for production environments.

Alternative Substitutes for Specific Applications:

UA1M (SMC Diode Solutions) — Suitable for applications requiring lower reverse leakage current (3 µA versus 5 µA). Maintains identical voltage, current, and recovery time specifications. Active product status with ROHS3 compliance. Operating temperature range -55°C to 150°C. Note: REACH Status is Affected.

US1M (EVVO Semi) — Functionally equivalent with identical voltage and current ratings. Forward voltage is 1.65 V at 1 A (slightly lower than original 1.7 V). Reverse recovery time matches at 75 ns. Active product status with ROHS3 compliance. Operating temperature range -55°C to 150°C.

CURA107-G (Comchip Technology) — Meets all critical electrical parameters with 1000 V, 1 A, 1.7 V forward voltage, and 75 ns recovery time. Active product status with ROHS3 compliance. Limited inventory (13,182 units). Operating temperature maximum 150°C.

Conditional Substitutes (Parameter Deviations):

FS1M-LTP (Micro Commercial Co) and RS1M (EVVO Semi) — These parts feature reduced forward voltage (1.3 V at 1 A) and extended reverse recovery time (500 ns). These deviations may impact thermal performance and switching characteristics. Suitable only for applications where slower recovery and lower forward voltage drop are acceptable or beneficial. Both are Active status with ROHS3 compliance.

US1M_R1_00001 (Panjit International Inc.) — Meets critical parameters with slightly extended reverse recovery time (100 ns versus 75 ns) and significantly lower reverse leakage current (1 µA versus 5 µA). Active product status with ROHS3 compliance. Limited inventory (3,000 units).

Frequently Asked Questions (FAQ)

Q: Can US1M-13-F be used as a direct replacement for the obsolete US1M?

A: Yes. The US1M-13-F is a parametric equivalent manufactured by Diodes Incorporated with identical electrical specifications: 1000 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, and 75 ns reverse recovery time. Both parts use the DO-214AC (SMA) Surface Mount package. The US1M-13-F is Active product status with full ROHS3 compliance and unlimited moisture sensitivity level.

Q: What is the difference between the Diodes Incorporated US1M and the EVVO Semi US1M?

A: Both parts share the same part number designation but are manufactured by different suppliers. The EVVO Semi version has a slightly lower forward voltage (1.65 V versus 1.7 V at 1 A) and a narrower operating temperature range (-55°C to 150°C versus -65°C to 150°C). Electrical performance is otherwise equivalent with matching 1000 V, 1 A, and 75 ns specifications.

Q: Are FS1M-LTP and RS1M suitable substitutes for the US1M?

A: These parts meet the critical voltage, current, and package requirements but exhibit different switching characteristics. Both feature reduced forward voltage (1.3 V at 1 A) and extended reverse recovery time (500 ns versus 75 ns). These deviations affect thermal dissipation and switching speed. Substitution is valid only when application requirements accommodate slower recovery and lower forward voltage drop.

Q: What is the significance of reverse recovery time differences among substitute parts?

A: Reverse recovery time (trr) determines how quickly the diode transitions from conducting to blocking state. The original US1M and most direct equivalents specify 75 ns. Parts with extended trr (such as FS1M-LTP at 500 ns) exhibit slower switching, which may increase switching losses in high-frequency applications. Parts with trr of 100 ns (US1M_R1_00001) represent a minor deviation with negligible impact in most applications.

Q: Can I use UA1M as a substitute if my application requires lower reverse leakage current?

A: Yes. The UA1M features 3 µA reverse leakage at 1000 V compared to 5 µA for the original US1M. All other electrical parameters match: 1000 V, 1 A, 1.7 V forward voltage, and 75 ns recovery time. The UA1M is Active product status with ROHS3 compliance. Note that UA1M is classified as Avalanche technology versus Standard technology for the original part.

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

A: All substitute parts use the DO-214AC (SMA) Surface Mount package. However, packaging formats differ: US1M-13-F is available in Cut Tape and Digi-Reel; UA1M, CURA107-G, and FS1M-LTP are supplied in Tape & Reel; RS1M and US1M (EVVO Semi) are available in Cut Tape and Digi-Reel; US1M_R1_00001 is supplied in Cut Tape and Digi-Reel. Verify packaging compatibility with your assembly process requirements.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level. REACH status varies: most parts are REACH Unaffected; UA1M is REACH Affected. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080. Verify REACH compliance requirements for your specific application and supply chain.

Q: Which substitute offers the best inventory availability?

A: US1M-13-F (Diodes Incorporated) provides the highest inventory with 935,300 units in stock. EVVO Semi US1M offers 545,300 units. RS1M (EVVO Semi) provides 75,180 units. Other alternatives have more limited availability: FS1M-LTP (9,596 units), CURA107-G (13,182 units), UA1M (5,900 units), and US1M_R1_00001 (3,000 units).

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