GF1A Equivalent & Substitute Parts

Part Overview

The GF1A is a general-purpose rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued supply, design updates, or alternative sourcing strategies while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	GF1A Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the GF1A is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Package / Case: Must be DO-214AC or SMA equivalent
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant

Performance Considerations:

Voltage - Forward (Vf) (Max) @ If: Lower values indicate improved efficiency
Reverse Recovery Time (trr): Affects switching speed; standard recovery (>500 ns) or fast recovery (≤500 ns) both acceptable
Current - Reverse Leakage @ Vr: Lower values indicate superior reverse blocking characteristics
Operating Temperature Range: Must accommodate application requirements

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (Standard Recovery Technology): Parts with matching or superior voltage and current ratings, standard recovery characteristics, and identical or compatible package specifications. These parts maintain the electrical performance profile of the GF1A.

Category B - Enhanced Performance Alternatives (Fast Recovery Technology): Parts with matching or superior voltage and current ratings but featuring fast recovery characteristics (≤500 ns). These parts offer improved switching performance and are suitable for applications tolerating faster recovery behavior.

Category C - Schottky Technology Alternatives: Parts with superior voltage ratings and Schottky technology, offering lower forward voltage drop. These are suitable only for applications where Schottky characteristics are acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns/µs]	Package	Product Status	Temp Range [°C]
GF1A	onsemi	50	1	1.0	2 µs	DO-214AC	Not For New Designs	-65 ~ 175
ES1A	YAGEO	50	1	0.95	—	DO-214AC	Active	—
RS1A	Taiwan Semiconductor Corporation	50	1	1.3	150 ns	DO-214AC	Active	-55 ~ 150
S1A	YAGEO	50	1	1.1	—	DO-214AC	Active	—
CMSH1-60M BK PBFREE	Central Semiconductor Corp	60	1	0.7	≤500 ns	DO-214AC	Active	-65 ~ 150
CMSH1-60M TR13 PBFREE	Central Semiconductor Corp	60	1	0.7	≤500 ns	DO-214AC	Active	-65 ~ 150
ES1A-13-F	Diodes Incorporated	50	1	0.92	25 ns	DO-214AC	Active	-55 ~ 150
ES1A-E3/61T	Vishay General Semiconductor - Diodes Division	50	1	0.92	25 ns	DO-214AC	Active	-55 ~ 150
ES1A-LTP	Micro Commercial Co	50	1	0.95	35 ns	DO-214AC	Not For New Designs	-65 ~ 175
GF1A-E3/67A	Vishay General Semiconductor - Diodes Division	50	1	1.1	2 µs	DO-214BA	Active	-65 ~ 175
RS1A-M3/61T	Vishay General Semiconductor - Diodes Division	50	1	1.3	150 ns	DO-214AC	Active	-55 ~ 150

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

ES1A-E3/61T (Vishay General Semiconductor - Diodes Division) and ES1A-13-F (Diodes Incorporated) are the primary candidates. Both parts maintain the 50 V / 1 A rating with DO-214AC packaging and Active product status. ES1A-E3/61T is available in Cut Tape & Digi-Reel® packaging with 75,150 pcs in stock, while ES1A-13-F is available in Tape & Reel with 70,300 pcs in stock. Both feature fast recovery characteristics (25 ns) and forward voltage of 0.92 V @ 1 A, representing improved efficiency over the GF1A. Both are ROHS3 Compliant with MSL 1 (Unlimited).

For Extended Temperature Range Applications:

ES1A-LTP (Micro Commercial Co) maintains the GF1A's operating temperature range of -65°C ~ 175°C while offering improved reverse recovery time (35 ns). However, this part carries "Not For New Designs" status. GF1A-E3/67A (Vishay General Semiconductor - Diodes Division) also supports -65°C ~ 175°C operation with Active status, though it uses DO-214BA packaging instead of DO-214AC, requiring PCB layout verification.

For Fast Recovery Applications:

RS1A (Taiwan Semiconductor Corporation) and RS1A-M3/61T (Vishay General Semiconductor - Diodes Division) provide 150 ns reverse recovery time with 50 V / 1 A ratings and DO-214AC packaging. Both are Active products with ROHS3 compliance. Operating temperature range is -55°C ~ 150°C, which is narrower than the GF1A.

For Higher Voltage Margin Applications:

CMSH1-60M BK PBFREE and CMSH1-60M TR13 PBFREE (Central Semiconductor Corp) offer 60 V reverse voltage rating with Schottky technology, resulting in 0.7 V forward voltage drop. These parts are suitable only for applications where Schottky diode characteristics are acceptable. Both are Active with ROHS3 compliance and -65°C ~ 150°C operating range.

Compliance and Certification:

All substitute parts listed are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity. All carry EAR99 ECCN classification and 8541.10.0080 HTSUS code, matching the GF1A. REACH status is "REACH Unaffected" for all parts.

Frequently Asked Questions (FAQ)

Q: Can ES1A-E3/61T directly replace GF1A in existing designs?

A: Yes. ES1A-E3/61T maintains the 50 V / 1 A electrical rating and DO-214AC package. The faster recovery time (25 ns vs. 2 µs) and lower forward voltage (0.92 V vs. 1.0 V) represent performance improvements. Verification of circuit behavior under the faster recovery characteristic is recommended for designs sensitive to switching transients.

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

A: Both are surface mount packages for single diodes in SMA form factor. DO-214AC and DO-214BA differ in lead configuration and internal die orientation. GF1A-E3/67A uses DO-214BA, which may require PCB layout modification. Consult package datasheets for pin compatibility before substitution.

Q: Are Schottky alternatives (CMSH1-60M series) suitable for all GF1A applications?

A: Schottky diodes exhibit different reverse leakage characteristics (500 µA @ 60 V vs. 5 µA @ 50 V for standard diodes) and lower forward voltage (0.7 V vs. 1.0 V). These differences affect circuit behavior in rectification, clamping, and protection applications. Schottky substitution is valid only when circuit design explicitly accommodates these characteristics.

Q: Why does RS1A have higher forward voltage (1.3 V) than GF1A (1.0 V)?

A: RS1A features fast recovery technology (150 ns) compared to GF1A's standard recovery (2 µs). The trade-off between recovery speed and forward voltage drop is inherent to diode technology. RS1A is suitable for applications prioritizing fast switching over conduction loss.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active development and recommends alternative parts for new projects. GF1A and ES1A-LTP carry this status. Existing inventory remains available, but long-term supply cannot be guaranteed. For new designs, Active-status alternatives such as ES1A-E3/61T or RS1A-M3/61T are preferred.

Q: Can I use a 50 V rated diode in a circuit designed for 60 V margin?

A: No. The GF1A and its 50 V equivalents are rated for maximum 50 V reverse voltage. Using them in circuits requiring 60 V margin violates absolute maximum ratings. CMSH1-60M series parts provide 60 V rating but introduce Schottky technology differences.

Q: How does operating temperature range affect substitution?

A: GF1A operates from -65°C to 175°C. Most fast-recovery alternatives (RS1A, ES1A-13-F) limit operation to -55°C ~ 150°C. For applications requiring full -65°C ~ 175°C range, ES1A-LTP or GF1A-E3/67A are necessary, though GF1A-E3/67A requires package verification.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component is not moisture-sensitive and requires no special handling, storage, or baking procedures. All listed substitutes carry MSL 1, ensuring identical moisture management requirements.

Q: Are there packaging format differences between substitutes?

A: Yes. Most substitutes are available in Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR) formats. CMSH1-60M BK PBFREE is available in Bulk packaging. Verify packaging compatibility with assembly equipment and procurement requirements before selection.

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