Equivalent & Substitute Parts for US1G-13

Part Overview

The US1G-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package (DO-214AC). This part is classified as discontinued at DiGi Electronics, which necessitates identification of equivalent and substitute components for ongoing production and repair applications. Equivalent parts maintain identical or superior electrical characteristics within the same package footprint, while substitute parts offer functional compatibility with minor parameter variations acceptable for the application.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	20	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the US1G-13 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA (surface mount footprint compatibility)
Mounting Type: Surface Mount

Compatible Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 1.0 V to 1.3 V range acceptable
Reverse Recovery Time (trr): 35 ns to 400 ns acceptable for general-purpose applications
Current - Reverse Leakage @ Vr: 5 µA to 10 µA acceptable
Operating Temperature - Junction: Minimum -55°C acceptable (original -65°C is more stringent)
RoHS Status: ROHS3 Compliant substitutes preferred for new designs

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally compatible with minor parameter deviations).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
US1G-13	Diodes Incorporated	400	1	1.3 @ 1 A	50	5 @ 400 V	DO-214AC, SMA	Discontinued	RoHS non-compliant
US1G-13-F	Diodes Incorporated	400	1	1.3 @ 1 A	50	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
RS1G-13-F	Diodes Incorporated	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
1SR156-400TE25	Rohm Semiconductor	400	1	1.3 @ 800 mA	400	10 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
CGRA4004-G	Comchip Technology	400	1	1.1 @ 1 A	—	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
CURA104-G	Comchip Technology	400	1	1.3 @ 1 A	50	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
ES1G	Good-Ark Semiconductor	400	1	1.3 @ 1 A	35	5 @ 400 V	DO-214AC, SMA	Active	ROHS3 Compliant
GF1G	onsemi	400	1	1.0 @ 1 A	2000	5 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
GS1G-LTP	Micro Commercial Co	400	1	1.0 @ 1 A	—	10 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
GS1GE-TP	Micro Commercial Co	400	1	1.1 @ 1 A	—	5 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
MRA4004T3G	onsemi	400	1	1.1 @ 1 A	—	10 @ 400 V	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: US1G-13-F

The US1G-13-F from Diodes Incorporated is the direct parametric equivalent to the discontinued US1G-13. It maintains identical electrical specifications (400 V, 1 A, 1.3 V forward voltage, 50 ns recovery time) and is manufactured by the same supplier. The part is currently active and ROHS3 compliant, making it suitable for new designs and production continuity. This part is available in high volume (155,300 pcs in stock).

Secondary Recommendation: CURA104-G

The CURA104-G from Comchip Technology provides an active alternative with matching fast recovery characteristics (50 ns trr) and identical voltage/current ratings. It is ROHS3 compliant and currently in production. This part is suitable for applications requiring fast recovery performance equivalent to the original US1G-13.

Alternative for Standard Recovery Applications: CGRA4004-G

The CGRA4004-G from Comchip Technology is an active, ROHS3-compliant alternative suitable for applications where standard recovery speed (>500 ns) is acceptable. It offers lower forward voltage (1.1 V @ 1 A) and is available in volume (20,100 pcs in stock).

Legacy Compatibility: ES1G

The ES1G from Good-Ark Semiconductor is an active substitute offering superior fast recovery performance (35 ns trr) with identical voltage and current ratings. It is ROHS3 compliant and available in high volume (415,300 pcs in stock), making it suitable for both new designs and legacy system replacements.

Not Recommended for New Designs:

Parts marked "Not For New Designs" (GF1G, GS1G-LTP, GS1GE-TP, MRA4004T3G, 1SR156-400TE25) are suitable only for replacement in existing systems where component continuity is required. These parts should not be selected for new product development.

Frequently Asked Questions (FAQ)

Q: Can I use US1G-13-F as a direct replacement for US1G-13?

A: Yes. The US1G-13-F is a parametric equivalent with identical electrical specifications (400 V, 1 A, 1.3 V forward voltage, 50 ns recovery time) and the same DO-214AC SMA package. It is the recommended replacement for the discontinued US1G-13.

Q: What is the difference between fast recovery and standard recovery diodes in this comparison?

A: Fast recovery diodes have reverse recovery time (trr) ≤ 500 ns and are suitable for high-frequency switching applications. Standard recovery diodes have trr > 500 ns and are suitable for lower-frequency rectification. The original US1G-13 is a fast recovery device (50 ns). Substitutes like CGRA4004-G and GF1G are standard recovery devices and may not be suitable for high-frequency applications.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original US1G-13 is RoHS non-compliant. If RoHS compliance is required for your application, select from the active, ROHS3-compliant alternatives: US1G-13-F, CURA104-G, CGRA4004-G, or ES1G.

Q: Can I use parts marked "Not For New Designs" in new products?

A: No. Parts designated "Not For New Designs" (GF1G, GS1G-LTP, GS1GE-TP, MRA4004T3G, 1SR156-400TE25) are intended only for replacement in existing systems. For new product development, select from parts with "Active" product status: US1G-13-F, CURA104-G, CGRA4004-G, CURA104-G, or ES1G.

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

A: Forward voltage ranges from 1.0 V to 1.3 V across the substitute parts. Lower forward voltage (1.0 V to 1.1 V) results in reduced power dissipation and heat generation. Higher forward voltage (1.3 V) matches the original US1G-13 specification. Selection depends on thermal design requirements and circuit tolerance for voltage drop.

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

A: Yes. All substitute parts use the DO-214AC SMA surface mount package, ensuring mechanical and electrical compatibility with the original US1G-13 footprint. Verify PCB layout compatibility before assembly.

Q: What does reverse recovery time (trr) mean for my application?

A: Reverse recovery time is the interval required for a diode to stop conducting after the applied voltage reverses. Shorter trr (35–50 ns) is critical for high-frequency switching and power conversion circuits. Longer trr (400 ns to 2 µs) is acceptable for low-frequency rectification. The original US1G-13 has 50 ns trr; select substitutes with matching or faster trr for equivalent performance.

Q: Can I substitute a part with higher reverse leakage current?

A: Reverse leakage current ranges from 5 µA to 10 µA across the substitute parts. Higher leakage (10 µA) increases standby power consumption and heat generation but is generally acceptable for general-purpose rectification. For precision analog circuits or low-power applications, select parts with 5 µA leakage (US1G-13-F, CURA104-G, ES1G, GS1GE-TP).

Q: What is the operating temperature range consideration?

A: The original US1G-13 operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C or -55°C to 175°C. If your application requires operation below -55°C, verify the substitute part's minimum temperature specification. For standard industrial applications (-40°C to 85°C), all listed substitutes are suitable.

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