AS1G-HF Equivalent & Substitute Parts Engineering Reference

Part Overview

The AS1G-HF (Comchip Technology) is an automotive-grade, standard recovery rectifier diode rated for 400 V DC reverse voltage and 1 A average rectified current, featuring a maximum forward voltage of 1.1 V at 1 A and supplied in a DO-214AC (SMA) surface mount package. This device is AEC-Q101 qualified, ROHS3 compliant, and has an operating temperature range of -55°C to +150°C. The product is currently listed as active. Identifying alternative models is essential for supply chain resilience, production continuity, and multi-sourcing requirements where product status, mechanical compatibility, and electrical performance must closely match the original part.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Speed	Standard Recovery >500ns, >200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution is determined strictly by equivalence in key parameters:

Maximum reverse voltage (400 V)
Average rectified current (1 A)
Forward voltage at rated current (1.1 V @ 1 A)
Standard recovery features
Comparable reverse leakage current
Automotive grade and AEC-Q101 qualification where applicable
Surface mount mechanical compatibility (DO-214AC, SMA package)
Operating temperature range
ROHS3 compliance and MSL1 rating

Accepted substitutes match these electrical, mechanical, and regulatory attributes as provided.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ 1A	Speed	Reverse Leakage @ Vr	Grade	Qualification	Mounting Type	Package	Tj (Operating Temp)	RoHS Status	MSL	Product Status
AS1G-HF	Comchip Technology	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	5 µA @ 400 V	Automotive	AEC-Q101	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
ACGRA4004-HF	Comchip Technology	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	5 µA @ 400 V	Automotive	AEC-Q101	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
CGRA4004-G	Comchip Technology	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	5 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
S1G-HF	Comchip Technology	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	5 µA @ 1700 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
CS1G-E3/I	Vishay General Semiconductor	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	5 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Obsolete
GS1G_R1_00001	Panjit International Inc.	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
GS1GE-TP	Micro Commercial Co	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	5 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Not For New Designs
GS1GWG_R1_00001	Panjit International Inc.	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Not For New Designs
S1G	Diotec Semiconductor	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-50°C ~ 150°C	ROHS3	1	Active
S1G-E3/5AT	Vishay General Semiconductor	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
S1G-E3/61T	Vishay General Semiconductor	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	-	-	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
S1GHE3_A/H	Vishay General Semiconductor	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	Automotive	AEC-Q101	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active
S1GHE3_A/I	Vishay General Semiconductor	400 V	1 A	1.1 V	Standard Recovery >500ns, >200mA	1 µA @ 400 V	Automotive	AEC-Q101	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3	1	Active

Engineering Selection Recommendations

Select substitute parts based on equivalent product status (active where required), ROHS3 compliance, and MSL 1 (unlimited) rating. For automotive and AEC-Q101 qualification needs, use parts explicitly marked as automotive grade with AEC-Q101 qualification. For obsolete or not-for-new-design substitutes, use only when no active alternatives are available and lifecycle or compliance constraints are addressed by the design.

Frequently Asked Questions (FAQ)

Q: What defines a valid substitute for the AS1G-HF rectifier?
A: Valid substitutes are parametric equivalents with identical ratings for reverse voltage, rectified current, forward voltage, package (DO-214AC, SMA), operating temperature, and compliance parameters as specified.

Q: Are all substitutes automotive-grade and AEC-Q101 qualified?
A: Only parts explicitly listed with automotive grade and AEC-Q101 qualification meet these criteria. Verify the provided fields for qualification status.

Q: Is the package and footprint identical across all substitutes?
A: All substitutes share the DO-214AC (SMA) surface mount package, ensuring mechanical compatibility.

Q: What compliance and reliability standards are met by these substitutes?
A: All parts are ROHS3 compliant and MSL1 rated. AEC-Q101 qualification is only assigned to those substitutes with this field marked.

Q: How should product status influence substitute part selection?
A: Select active status parts for new designs and manufacturing. "Obsolete" or "Not For New Designs" entries are suitable only if no active parts are available and the project allows for such lifecycle risks.

Q: Are there differences in reverse leakage current or operating temperature?
A: Minor differences are noted within the provided reverse leakage values and operating temperature ranges, all within defined acceptable ranges for this equivalency group. Refer to the comparison table for explicit values.

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