US1D/1 General Purpose Rectifier Diode - Equivalent & Substitute Parts

Part Overview

The US1D/1 is a general purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 200V DC reverse voltage and 1A average rectified current in a surface mount DO-214AC (SMA) package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The US1D/1 operates across a junction temperature range of -65°C to 175°C with fast recovery characteristics (≤500ns) and a reverse recovery time of 50ns.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1A
Speed Classification	Fast Recovery ≤500ns, >200mA	-
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 200V
Mounting Type	Surface Mount	-
Package / Case	DO-214AC, SMA	-
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	Non-compliant	-
Part Status	Obsolete	-

Substitute Part Grouping Explanation

Substitute parts for the US1D/1 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Voltage - DC Reverse (Vr): 200V minimum
Current - Average Rectified (Io): 1A
Package / Case: DO-214AC or SMA (surface mount)
Mounting Type: Surface Mount
Speed Classification: Fast Recovery (≤500ns, >200mA)

Secondary Compatibility Parameters:

Reverse Recovery Time (trr): ≤50ns preferred for direct substitution
Forward Voltage (Vf): ≤1V @ 1A for thermal performance equivalence
Reverse Leakage Current: ≤10µA @ 200V
Operating Temperature Range: -55°C to 175°C minimum

Parts are classified into two substitution categories:

Category 1 - Direct Electrical Equivalents: Parts matching all critical parameters with identical or superior electrical performance (EGF1D, CURA103-G, ES1D, ES1D-13-F, MURA120T3G, MURS1D-TP, S1D). These parts maintain the same voltage and current ratings with fast recovery characteristics.

Category 2 - Higher Voltage Alternatives: Parts with elevated voltage ratings (CURA104-G at 400V, CURA107-G at 1000V) suitable for applications requiring additional voltage margin while maintaining 1A current capacity and DO-214AC packaging.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A	trr (ns)	Ir @ Vr (µA)	Package	Product Status	RoHS Status
US1D/1	Vishay	200	1	1.0 V	50	10 @ 200V	DO-214AC	Obsolete	Non-compliant
EGF1D	onsemi	200	1	1.0 V	50	10 @ 200V	DO-214AC	Not For New Designs	ROHS3 Compliant
CURA103-G	Comchip Technology	200	1	1.0 V	50	5 @ 200V	DO-214AC	Active	ROHS3 Compliant
CURA104-G	Comchip Technology	400	1	1.3 V	50	5 @ 400V	DO-214AC	Active	ROHS3 Compliant
CURA107-G	Comchip Technology	1000	1	1.7 V	75	5 @ 1000V	DO-214AC	Active	ROHS3 Compliant
ES1D	EVVO Semi	200	1	1.0 V	35	5 @ 200V	SMA	Active	ROHS3 Compliant
ES1D-13-F	Diodes Incorporated	200	1	0.92 V	25	5 @ 200V	SMA	Active	ROHS3 Compliant
GF1D	Fairchild Semiconductor	200	1	1.0 V	2000	5 @ 200V	DO-214AC	Active	-
MURA120T3G	onsemi	200	1	0.875 V	35	2 @ 200V	SMA	Active	ROHS3 Compliant
MURS1D-TP	Micro Commercial Co	200	1	0.98 V	20	5 @ 200V	DO-214AC	Active	ROHS3 Compliant
S1D	YAGEO	200	1	-	-	-	DO-214AC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

CURA103-G (Comchip Technology) is the manufacturer-recommended substitute. It maintains 200V/1A ratings with 50ns reverse recovery time, identical to the US1D/1 specification. CURA103-G holds Active product status and ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original part. Reverse leakage current is improved at 5µA versus 10µA.

MURS1D-TP (Micro Commercial Co) provides equivalent performance with superior reverse recovery time (20ns) and forward voltage characteristics (980mV @ 1A). Active status and ROHS3 compliance support long-term availability.

ES1D-13-F (Diodes Incorporated) offers the lowest forward voltage (920mV @ 1A) and fastest reverse recovery (25ns), with the highest inventory availability (550,400 pcs). Active product status ensures supply continuity.

For Applications Requiring Voltage Margin:

CURA104-G (Comchip Technology) extends voltage rating to 400V while maintaining 1A current capacity and DO-214AC packaging. Suitable for circuits where higher voltage headroom is beneficial.

CURA107-G (Comchip Technology) provides 1000V rating for high-voltage applications, though reverse recovery time increases to 75ns and forward voltage rises to 1.7V @ 1A.

For Legacy System Compatibility:

EGF1D (onsemi) maintains closest electrical equivalence to US1D/1 with identical 200V/1A/50ns specifications. Classified as "Not For New Designs" but suitable for sustaining production of existing products.

GF1D (Fairchild Semiconductor) provides 200V/1A compatibility with standard recovery characteristics (2µs). Use only where fast recovery is not a circuit requirement.

Compliance Considerations:

All recommended active substitutes (CURA103-G, ES1D-13-F, MURS1D-TP, MURA120T3G, S1D) are ROHS3 compliant, addressing the non-compliant status of the obsolete US1D/1. All parts maintain EAR99 export classification and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can CURA104-G (400V) be used in place of US1D/1 (200V)?

A: Yes, CURA104-G is electrically compatible for 200V applications. The higher voltage rating provides additional safety margin. However, forward voltage increases to 1.3V @ 1A (versus 1.0V for US1D/1), resulting in approximately 30% higher power dissipation. Verify thermal design accommodates this increase.

Q: What is the difference between ES1D and ES1D-13-F?

A: Both are 200V/1A fast recovery diodes in SMA packaging from Diodes Incorporated. ES1D-13-F is the specified part number variant with documented forward voltage of 920mV @ 1A and reverse recovery time of 25ns. ES1D-13-F is preferred for new designs due to superior electrical characteristics and higher inventory availability.

Q: Why does GF1D have a 2µs reverse recovery time instead of 50ns?

A: GF1D uses standard recovery technology rather than fast recovery. The 2µs recovery time makes it unsuitable for high-frequency switching applications. Use GF1D only for low-frequency rectification where recovery speed is not critical.

Q: Are DO-214AC and SMA packages interchangeable?

A: DO-214AC and SMA refer to the same physical package. Both designations are correct. Parts specified as either package type are mechanically and electrically compatible on the same PCB footprint.

Q: Which substitute offers the best reverse leakage performance?

A: MURA120T3G exhibits the lowest reverse leakage current at 2µA @ 200V, compared to 10µA for US1D/1. This reduces standby power consumption in applications sensitive to leakage current.

Q: Is CURA103-G suitable for new product designs?

A: Yes. CURA103-G is manufacturer-recommended, holds Active product status, and is ROHS3 compliant. It is the preferred choice for new designs requiring 200V/1A fast recovery rectification in DO-214AC packaging.

Q: What is the inventory status for long-term supply?

A: ES1D-13-F (Diodes Incorporated) has the highest inventory at 550,400 pcs. CURA103-G (Comchip Technology) has 28,880 pcs. MURA120T3G (onsemi) has 129,300 pcs. All three parts are Active status, supporting sustained production requirements.

Q: Can CURA107-G (1000V) be used in 200V circuits?

A: Yes, CURA107-G is electrically compatible. However, forward voltage increases to 1.7V @ 1A (70% higher than US1D/1) and reverse recovery time extends to 75ns. Use only where voltage margin justifies the thermal and speed trade-offs.

Q: What compliance certifications apply to all recommended substitutes?

A: All active substitute parts (CURA103-G, ES1D-13-F, MURS1D-TP, MURA120T3G, S1D) are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes. These certifications match the regulatory requirements of modern electronics manufacturing.

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