US1M/1 Equivalent & Substitute Parts

Part Overview

The US1M/1 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.

Key Parameters

Parameter	US1M/1 Specification
Voltage - DC Reverse (Vr) (Max)	1000 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	75 ns
Current - Reverse Leakage @ Vr	10 µA @ 1000 V
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
Operating Temperature - Junction	-65°C ~ 175°C
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the US1M/1 are grouped based on electrical parameter compatibility within the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Surface Mount
Package / Case: DO-214AC or SMA equivalent
Operating Temperature Range: Must accommodate -65°C to 175°C or equivalent operational envelope

Substitution Groups:

Group 1: Direct Electrical Equivalents (1000 V, 1 A, Fast Recovery) Parts meeting all electrical specifications of the US1M/1 with fast recovery characteristics (≤ 500ns):

US1ME-TP (Micro Commercial Co)
CURA107-G (Comchip Technology)

Group 2: Direct Electrical Equivalents (1000 V, 1 A, Standard Recovery) Parts meeting voltage and current specifications with standard recovery characteristics (> 500ns):

GF1M (onsemi)
GS1M-LTP (Micro Commercial Co)
MRA4007T3G (onsemi)
S1M (EVVO Semi)

Group 3: Reduced Voltage Alternatives (800 V, 1 A) Parts suitable for applications where 800 V reverse voltage rating is sufficient:

GS1K-LTP (Micro Commercial Co)
MRA4006T3G (onsemi)

Group 4: Reduced Voltage Alternatives (200 V - 400 V, 1 A) Parts suitable for lower voltage applications:

CURA103-G (Comchip Technology) - 200 V
CURA104-G (Comchip Technology) - 400 V

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 1A	Speed	trr	Ir @ Vr	Package	Temp Range	RoHS Status	Product Status
US1M/1	Vishay	1000 V	1 A	1.7 V	Fast ≤ 500ns	75 ns	10 µA @ 1000V	DO-214AC	-65°C ~ 175°C	Non-compliant	Obsolete
US1ME-TP	Micro Commercial Co	1000 V	1 A	1.7 V	Fast ≤ 500ns	75 ns	10 µA @ 1000V	DO-214AC	-65°C ~ 175°C	ROHS3 Compliant	Obsolete
CURA107-G	Comchip Technology	1000 V	1 A	1.7 V	Fast ≤ 500ns	75 ns	5 µA @ 1000V	DO-214AC	-65°C ~ 150°C	ROHS3 Compliant	Active
GF1M	onsemi	1000 V	1 A	1.2 V	Standard > 500ns	2 µs	5 µA @ 1000V	DO-214AC	-65°C ~ 175°C	ROHS3 Compliant	Not For New Designs
GS1M-LTP	Micro Commercial Co	1000 V	1 A	1.0 V	Standard > 500ns	Not specified	10 µA @ 1000V	DO-214AC	-55°C ~ 150°C	ROHS3 Compliant	Active
MRA4007T3G	onsemi	1000 V	1 A	1.1 V	Standard > 500ns	Not specified	10 µA @ 1000V	DO-214AC	-55°C ~ 175°C	ROHS3 Compliant	Not For New Designs
S1M	EVVO Semi	1000 V	1 A	1.1 V	Standard > 500ns	Not specified	5 µA @ 1kV	DO-214AC	-55°C ~ 150°C	ROHS3 Compliant	Active
GS1K-LTP	Micro Commercial Co	800 V	1 A	1.0 V	Standard > 500ns	Not specified	10 µA @ 800V	DO-214AC	-55°C ~ 150°C	ROHS3 Compliant	Active
MRA4006T3G	onsemi	800 V	1 A	1.1 V	Standard > 500ns	Not specified	10 µA @ 800V	DO-214AC	-55°C ~ 175°C	ROHS3 Compliant	Not For New Designs
CURA103-G	Comchip Technology	200 V	1 A	1.0 V	Fast ≤ 500ns	50 ns	5 µA @ 200V	DO-214AC	-65°C ~ 150°C	ROHS3 Compliant	Active
CURA104-G	Comchip Technology	400 V	1 A	1.3 V	Fast ≤ 500ns	50 ns	5 µA @ 400V	DO-214AC	-65°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (1000 V, 1 A, Full Compatibility):

US1ME-TP is the closest direct substitute, maintaining identical electrical specifications including fast recovery characteristics and 75 ns reverse recovery time. Both parts are classified as obsolete; however, US1ME-TP offers ROHS3 compliance and higher inventory availability (15,800 pcs vs. 682 pcs).

CURA107-G provides full electrical equivalence with the advantage of active product status and ROHS3 compliance. This part is recommended for new designs requiring 1000 V, 1 A fast recovery performance. Inventory availability is 13,182 pcs.

For Active Product Status with 1000 V, 1 A Rating:

GS1M-LTP (Micro Commercial Co) and S1M (EVVO Semi) are both active products meeting 1000 V and 1 A specifications. Both offer ROHS3 compliance. GS1M-LTP provides higher inventory (88,005 pcs) and is recommended for production applications. S1M is available with 5,394 pcs inventory.

Both GS1M-LTP and S1M employ standard recovery characteristics (> 500ns) rather than fast recovery, resulting in lower forward voltage (1.0 V and 1.1 V respectively) compared to the US1M/1 (1.7 V).

For Reduced Voltage Applications (800 V, 1 A):

GS1K-LTP is an active product with 8,458 pcs inventory and ROHS3 compliance. This part is suitable only for applications where 800 V reverse voltage rating is sufficient.

For Lower Voltage Applications (200 V - 400 V, 1 A):

CURA103-G (200 V) and CURA104-G (400 V) are active products with ROHS3 compliance and fast recovery characteristics. These parts are suitable only for applications with reduced voltage requirements.

Compliance Considerations:

All substitute parts except US1M/1 are ROHS3 compliant. The US1M/1 is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are acceptable.

Frequently Asked Questions (FAQ)

Q: Can US1ME-TP directly replace US1M/1 without circuit modification?

A: Yes. US1ME-TP maintains identical electrical specifications: 1000 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, 75 ns reverse recovery time, and fast recovery characteristics. Both use DO-214AC (SMA) surface mount packaging. No circuit modification is required.

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

A: Fast recovery diodes (US1ME-TP, CURA107-G, CURA103-G, CURA104-G) have reverse recovery times ≤ 500 ns. Standard recovery diodes (GF1M, GS1M-LTP, MRA4007T3G, S1M, GS1K-LTP, MRA4006T3G) have reverse recovery times > 500 ns. Fast recovery diodes are preferred in high-frequency switching applications. Standard recovery diodes typically exhibit lower forward voltage drop.

Q: Can I use GS1K-LTP or MRA4006T3G (800 V rated) as a substitute for US1M/1 (1000 V rated)?

A: GS1K-LTP and MRA4006T3G are suitable only for applications where the maximum reverse voltage does not exceed 800 V. These parts cannot be used in circuits requiring 1000 V reverse voltage rating. Verify circuit voltage requirements before substitution.

Q: Can I use CURA103-G or CURA104-G (200 V or 400 V rated) as a substitute for US1M/1?

A: CURA103-G and CURA104-G are suitable only for applications where the maximum reverse voltage does not exceed 200 V and 400 V respectively. These parts cannot be used in circuits requiring 1000 V reverse voltage rating. Verify circuit voltage requirements before substitution.

Q: What is the advantage of CURA107-G over GS1M-LTP for 1000 V, 1 A applications?

A: CURA107-G maintains fast recovery characteristics (75 ns reverse recovery time) identical to the US1M/1, while GS1M-LTP uses standard recovery (> 500 ns). CURA107-G is recommended for high-frequency switching applications. GS1M-LTP offers lower forward voltage (1.0 V vs. 1.7 V) and higher inventory availability (88,005 pcs vs. 13,182 pcs).

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original US1M/1 is RoHS non-compliant. For applications requiring RoHS compliance, any substitute part is acceptable.

Q: What is the operating temperature range difference between US1M/1 and its substitutes?

A: US1M/1 operates from -65°C to 175°C. CURA107-G, CURA103-G, and CURA104-G operate from -65°C to 150°C. GS1M-LTP, GS1K-LTP, MRA4007T3G, MRA4006T3G, and S1M operate from -55°C to 150°C or -55°C to 175°C. Verify application temperature requirements before substitution.

Q: Which substitute offers the best inventory availability?

A: MRA4007T3G (onsemi) offers the highest inventory with 425,100 pcs available. GS1M-LTP (Micro Commercial Co) offers 88,005 pcs. Both parts meet 1000 V, 1 A specifications with ROHS3 compliance. MRA4007T3G is classified as "Not For New Designs," while GS1M-LTP is active.

Q: Can I use S1M as a substitute for US1M/1?

A: Yes. S1M meets 1000 V reverse voltage and 1 A current specifications with ROHS3 compliance and active product status. S1M uses standard recovery characteristics with 1.1 V forward voltage at 1 A. Operating temperature range is -55°C to 150°C. Verify application temperature requirements before substitution.

Q: What is the difference in forward voltage between US1M/1 and its substitutes?

A: US1M/1 has 1.7 V forward voltage at 1 A. Fast recovery substitutes (US1ME-TP, CURA107-G) maintain 1.7 V. Standard recovery substitutes show lower forward voltage: GF1M (1.2 V), GS1M-LTP (1.0 V), MRA4007T3G (1.1 V), S1M (1.1 V), GS1K-LTP (1.0 V), MRA4006T3G (1.1 V). Lower forward voltage reduces power dissipation in the diode.

Q: Are US1M/1 and US1ME-TP pin-compatible?

A: Yes. Both parts use DO-214AC (SMA) surface mount packaging with identical pin configuration. No PCB layout modification is required for substitution.

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