GF1G Equivalent & Substitute Parts

Part Overview

The GF1G is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status within onsemi's product portfolio. Identification of equivalent and substitute parts is necessary for design continuity, legacy system support, and procurement flexibility when the primary part becomes unavailable or when alternative sourcing is required.

Key Parameters

Parameter	GF1G Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	V @ A
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-65°C ~ 175°C	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the GF1G is determined by strict electrical and mechanical compatibility across 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
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may range from 1.0 V to 1.3 V @ 1 A without functional impact in standard rectification applications
Speed Classification: Both Standard Recovery (>500ns) and Fast Recovery (≤500ns) diodes are acceptable substitutes, as recovery speed does not affect basic rectification function in non-critical switching applications
Reverse Recovery Time (trr): Substitute parts may exhibit faster recovery characteristics (25 ns to 150 ns) compared to the GF1G (2 µs) without compatibility issues
Current - Reverse Leakage @ Vr: Substitute parts may range from 1 µA to 10 µA @ 400 V without functional degradation
Operating Temperature - Junction: Substitute parts with equal or wider temperature ranges are acceptable; the GF1G range of -65°C ~ 175°C establishes the baseline

Substitute parts are grouped into two categories: Direct Equivalents (matching all parameters within tolerance) and Functional Equivalents (meeting all mandatory parameters with allowable variations in secondary characteristics).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	Speed	trr [µs/ns]	Ir @ Vr [µA @ V]	Package	Temp Range [°C]	Product Status
GF1G	onsemi	400	1	1 @ 1	Standard >500ns	2 µs	5 @ 400	DO-214AC (SMA)	-65 ~ 175	Not For New Designs
ES1G	Good-Ark Semiconductor	400	1	1.3 @ 1	Fast ≤500ns	35 ns	5 @ 400	DO-214AC (SMA)	-55 ~ 125	Active
MRA4004T3G	onsemi	400	1	1.1 @ 1	Standard >500ns	-	10 @ 400	DO-214AC (SMA)	-55 ~ 175	Not For New Designs
NRVA4004T3G	onsemi	400	1	1.1 @ 1	Standard >500ns	-	10 @ 400	DO-214AC (SMA)	-55 ~ 175	Not For New Designs
RS1G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1	Fast ≤500ns	150 ns	5 @ 400	DO-214AC (SMA)	-55 ~ 150	Active
S1G	Diotec Semiconductor	400	1	1.1 @ 1	Standard >500ns	1.5 µs	1 @ 400	DO-214AC (SMA)	-50 ~ 150	Active
CMR1-04M BK PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1	Standard >500ns	-	10 @ 400	DO-214AC (SMA)	-65 ~ 150	Active
CMR1-04M TR13 PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1	Standard >500ns	-	5 @ 400	DO-214AC (SMA)	-65 ~ 150	Active
ES1G-13-F	Diodes Incorporated	400	1	1.25 @ 1	Fast ≤500ns	25 ns	5 @ 400	DO-214AC (SMA)	-55 ~ 150	Active
ES1G-LTP	Micro Commercial Co	400	1	1.25 @ 1	Fast ≤500ns	35 ns	5 @ 400	DO-214AC (SMA)	-65 ~ 175	Active
GS1G-LTP	Micro Commercial Co	400	1	1 @ 1	Standard >500ns	-	10 @ 400	DO-214AC (SMA)	-55 ~ 150	Not For New Designs

Engineering Selection Recommendations

Primary Substitute (Active Status, Closest Electrical Match):

ES1G-LTP (Micro Commercial Co) is the recommended primary substitute for the GF1G. This part maintains identical voltage and current ratings (400 V, 1 A), operates across the same extended temperature range (-65°C ~ 175°C), and carries Active product status. The forward voltage specification (1.25 V @ 1 A) is within acceptable tolerance for standard rectification circuits. Fast recovery characteristics (35 ns) represent an improvement over the GF1G's standard recovery speed without introducing compatibility concerns in non-critical switching applications.

Secondary Substitutes (Active Status, Acceptable Electrical Variation):

ES1G (Good-Ark Semiconductor), RS1G (Taiwan Semiconductor Corporation), and ES1G-13-F (Diodes Incorporated) are acceptable secondary substitutes. All three maintain the 400 V / 1 A electrical specification and DO-214AC package requirement. These parts feature fast recovery characteristics and are in Active product status. Operating temperature ranges are narrower than the GF1G (-55°C ~ 125°C for ES1G, -55°C ~ 150°C for RS1G and ES1G-13-F), which may limit application in extreme low-temperature environments.

Tertiary Substitutes (Active Status, Standard Recovery):

S1G (Diotec Semiconductor), CMR1-04M BK PBFREE, and CMR1-04M TR13 PBFREE (Central Semiconductor Corp) are acceptable tertiary substitutes with Active product status. These parts maintain standard recovery characteristics similar to the GF1G and meet all mandatory electrical and package specifications. S1G exhibits the lowest reverse leakage current (1 µA @ 400 V) among all substitutes. CMR1-04M variants offer extended low-temperature operation (-65°C) in the bulk and tape & reel packaging options.

Not Recommended for New Designs:

MRA4004T3G, NRVA4004T3G, and GS1G-LTP carry "Not For New Designs" status and should not be selected for new circuit designs, despite meeting electrical specifications. These parts are suitable only for legacy system maintenance and repair applications where the original part number is unavailable.

Packaging Consideration:

All substitute parts are available in DO-214AC (SMA) surface mount package with identical footprint and mounting characteristics to the GF1G. Packaging variants (Cut Tape, Tape & Reel, Bulk) do not affect electrical or mechanical compatibility; selection should be based on procurement quantity and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can ES1G-LTP be used as a direct replacement for GF1G without circuit modification?

A: Yes. ES1G-LTP meets all mandatory electrical specifications (400 V reverse voltage, 1 A average rectified current) and package requirements (DO-214AC, SMA). The forward voltage difference (1.25 V vs. 1 V @ 1 A) and faster recovery time (35 ns vs. 2 µs) do not require circuit modification in standard rectification applications. Both parts operate across overlapping temperature ranges, with ES1G-LTP providing extended high-temperature capability (175°C vs. 125°C maximum for some alternatives).

Q: What is the difference between Standard Recovery and Fast Recovery diodes in this product category?

A: Recovery speed classification indicates the time required for reverse current to cease after the diode transitions from forward to reverse bias. The GF1G exhibits Standard Recovery (>500ns, 2 µs typical), while substitute parts such as ES1G and RS1G feature Fast Recovery (≤500ns, 25-150 ns typical). In low-frequency rectification circuits, this difference has negligible impact on performance. Fast recovery substitutes may reduce switching losses in higher-frequency applications but do not introduce compatibility issues in standard power supply designs.

Q: Are there any compliance or certification differences between the GF1G and its substitutes?

A: All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) classification, matching the GF1G's compliance profile. NRVA4004T3G carries additional AEC-Q101 automotive qualification, which is not present in the GF1G. This qualification does not prevent use of NRVA4004T3G in non-automotive applications but indicates enhanced reliability screening. For automotive applications, NRVA4004T3G is the only qualified option among the substitutes.

Q: Why do some substitute parts have narrower operating temperature ranges than the GF1G?

A: Operating temperature range is determined by the semiconductor manufacturing process and package design. The GF1G operates from -65°C to 175°C, while ES1G operates from -55°C to 125°C. Narrower ranges do not indicate inferior quality but reflect different design specifications. Selection should match the application's actual temperature requirements. For applications requiring the full -65°C to 175°C range, ES1G-LTP, CMR1-04M variants, or S1G are appropriate choices.

Q: Can I substitute a Fast Recovery diode (such as ES1G) for the Standard Recovery GF1G in a simple AC-to-DC power supply?

A: Yes. Fast recovery diodes are functionally compatible with Standard Recovery applications. The faster recovery time (35 ns vs. 2 µs) reduces reverse recovery current and switching losses, providing equal or improved performance in rectification circuits. No circuit modification is required. The primary consideration is forward voltage drop; ES1G specifies 1.3 V @ 1 A compared to GF1G's 1 V @ 1 A, resulting in approximately 0.3 V additional voltage drop across the diode, which may affect output voltage regulation in low-voltage applications.

Q: What is the significance of "Not For New Designs" status for GF1G and similar parts?

A: "Not For New Designs" indicates that the manufacturer (onsemi) has discontinued active development and recommends against using this part in new circuit designs. The part remains available from existing inventory but may have limited long-term availability. For new designs, Active status substitutes such as ES1G-LTP, RS1G, or S1G are preferred to ensure long-term supply continuity and access to manufacturer technical support.

Q: Are there any reverse leakage current differences that would affect circuit performance?

A: Reverse leakage current specifications range from 1 µA (S1G) to 10 µA (MRA4004T3G, NRVA4004T3G, CMR1-04M BK PBFREE, GS1G-LTP) at 400 V, compared to the GF1G's 5 µA @ 400 V. These differences are negligible in standard rectification applications. In high-impedance analog circuits or precision measurement applications, lower leakage current (S1G at 1 µA) may provide marginal performance improvement, but this consideration is application-specific and not a general substitution criterion.

Q: Can I use CMR1-04M TR13 PBFREE in place of GF1G if I need Tape & Reel packaging?

A: Yes. CMR1-04M TR13 PBFREE is electrically and mechanically compatible with GF1G and is available in Tape & Reel (TR) packaging format. This variant maintains the same DO-214AC (SMA) footprint and electrical specifications. The TR13 designation indicates tape reel configuration; selection between bulk, cut tape, and tape & reel formats depends on procurement quantity and assembly line requirements, not electrical compatibility.

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