GF1K Equivalent & Substitute Parts

Part Overview

The GF1K is a general-purpose rectifier diode manufactured by onsemi, rated for 800 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status within onsemi's product portfolio. The standard recovery speed (>500 ns) and 2 µs reverse recovery time characterize this as a conventional rectifier suitable for general AC-to-DC conversion applications. Due to its obsolescence status, identification of functionally equivalent alternatives is necessary for ongoing production support and design continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	1.2	V @ 1 A
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the GF1K is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) rating of 800 V or higher
Current - Average Rectified (Io) rating of 1 A or higher
Surface mount package compatibility (DO-214AC / SMA)
Forward voltage (Vf) within acceptable circuit tolerance
Operating temperature range sufficient for application requirements

Substitution Logic:

Parts are grouped into two categories based on voltage rating:

800 V Rated Substitutes – Direct voltage equivalents to GF1K, suitable for circuits designed for 800 V maximum reverse voltage. These include MRA4006T3G, NRVA4006T3G, RS1K, CGRA4006-G, and S1K.
1000 V Rated Substitutes – Higher voltage alternatives that operate within the same 1 A current specification. These include MRA4007T3G, NRVA4007T3G, RS1M, and S1M. These parts provide additional voltage margin and are suitable for applications where 800 V rating is insufficient or where design flexibility is required.

Package Consideration:

GF1K-E3/67A uses DO-214BA package, which differs from the GF1K's DO-214AC package. While both are surface mount SMA-style packages, mechanical footprint compatibility must be verified before substitution.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [µs]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
GF1K	onsemi	800	1	1.2	2	5 @ 800V	DO-214AC	-65 to 175	Not For New Designs
MRA4006T3G	onsemi	800	1	1.1	—	10 @ 800V	DO-214AC	-55 to 175	Not For New Designs
MRA4007T3G	onsemi	1000	1	1.1	—	10 @ 1000V	DO-214AC	-55 to 175	Not For New Designs
NRVA4006T3G	onsemi	800	1	1.1	—	10 @ 800V	DO-214AC	-55 to 150	Not For New Designs
NRVA4007T3G	onsemi	1000	1	1.1	—	10 @ 1000V	DO-214AC	-55 to 150	Not For New Designs
RS1K	Fairchild Semiconductor	800	1	1.3	0.5	5 @ 800V	DO-214AC	-55 to 150	Active
RS1M	EVVO Semi	1000	1	1.3	0.5	5 @ 1kV	DO-214AC	-55 to 150	Active
S1K	YAGEO	800	1	1.1	—	—	DO-214AC	—	Active
S1M	EVVO Semi	1000	1	1.1	—	5 @ 1kV	DO-214AC	-55 to 150	Active
GF1K-E3/67A	Vishay General Semiconductor	800	1	1.2	2	5 @ 800V	DO-214BA	-65 to 175	Active
CGRA4006-G	Comchip Technology	800	1	1.1	—	5 @ 800V	DO-214AC	-55 to 150	Active

Engineering Selection Recommendations

For Direct Replacement (800 V, Active Status):

RS1K (Fairchild Semiconductor) and CGRA4006-G (Comchip Technology) are active production alternatives with 800 V ratings matching the GF1K specification. RS1K maintains identical reverse leakage current (5 µA @ 800 V) and junction temperature range (-55°C to 150°C upper limit). CGRA4006-G provides equivalent electrical performance with lower forward voltage (1.1 V vs. 1.2 V). Both are in DO-214AC package format with full RoHS3 compliance.

For Extended Voltage Margin (1000 V, Active Status):

RS1M (EVVO Semi) and S1M (EVVO Semi) provide 1000 V reverse voltage rating while maintaining 1 A current specification. These are suitable for applications requiring additional voltage headroom. RS1M exhibits fast recovery characteristics (0.5 µs trr) compared to GF1K's standard recovery (2 µs). S1M maintains standard recovery speed matching GF1K behavior.

For Thermal Performance Preservation:

GF1K-E3/67A (Vishay General Semiconductor) preserves the full -65°C to 175°C junction temperature range of the original GF1K and maintains identical electrical characteristics (1.2 V forward voltage, 2 µs reverse recovery time, 5 µA reverse leakage). This part is active production status. Package substitution from DO-214AC to DO-214BA requires PCB footprint verification.

For onsemi Product Line Continuity:

MRA4006T3G and MRA4007T3G (onsemi) maintain manufacturer continuity but retain "Not For New Designs" status. These are suitable only for legacy production support where design changes are not feasible. NRVA4006T3G and NRVA4007T3G provide automotive-grade alternatives (AEC-Q101 qualified) with reduced upper junction temperature limit (-55°C to 150°C).

Frequently Asked Questions (FAQ)

Q: Can GF1K be replaced with a 1000 V rated diode in an 800 V circuit?

A: Yes. MRA4007T3G, NRVA4007T3G, RS1M, and S1M are rated for 1000 V and operate within 800 V circuits. The higher voltage rating provides additional safety margin. Forward voltage and reverse leakage characteristics remain within acceptable ranges for standard rectifier applications.

Q: What is the difference between DO-214AC and DO-214BA packages?

A: Both are surface mount SMA-style packages for 1 A diodes. DO-214AC and DO-214BA differ in mechanical dimensions and PCB footprint. GF1K uses DO-214AC; GF1K-E3/67A uses DO-214BA. Direct substitution requires footprint compatibility verification before PCB assembly.

Q: Why do some substitutes show "Not For New Designs" status?

A: MRA4006T3G, MRA4007T3G, NRVA4006T3G, and NRVA4007T3G are onsemi products designated as end-of-life. These are listed as substitutes based on the GF1K's own substitute list but are suitable only for legacy production support. For new designs, select active status alternatives: RS1K, RS1M, S1K, S1M, GF1K-E3/67A, or CGRA4006-G.

Q: How does reverse recovery time affect circuit performance?

A: GF1K specifies 2 µs reverse recovery time (standard recovery). RS1K and RS1M specify 0.5 µs (fast recovery). Faster recovery reduces switching losses in high-frequency applications but is not required for standard 50/60 Hz rectification. Both recovery speeds are compatible with conventional power supply designs.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitutes carry RoHS3 compliance certification. GF1K, MRA4006T3G, MRA4007T3G, NRVA4006T3G, NRVA4007T3G, RS1M, S1M, GF1K-E3/67A, and CGRA4006-G are all ROHS3 Compliant. RS1K and S1K status is confirmed as ROHS3 Compliant.

Q: What is the significance of Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture bake-out requirements. All listed substitutes carry MSL 1 rating, eliminating moisture-related handling constraints during storage and assembly.

Q: Can GF1K be used in automotive applications?

A: GF1K is not automotive-qualified. For automotive applications requiring AEC-Q101 qualification, use NRVA4006T3G (800 V) or NRVA4007T3G (1000 V), both carrying AEC-Q101 certification.

Q: Which substitute offers the closest electrical match to GF1K?

A: GF1K-E3/67A (Vishay) provides the closest electrical match with identical forward voltage (1.2 V @ 1 A), reverse recovery time (2 µs), reverse leakage (5 µA @ 800 V), and junction temperature range (-65°C to 175°C). Package format differs (DO-214BA vs. DO-214AC), requiring footprint verification.

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