Equivalent & Substitute Parts for S1A-13

Part Overview

The S1A-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package (DO-214AC). This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating different packaging formats and manufacturer sourcing options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Reverse Recovery Time (trr)	3	µs
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the S1A-13 is determined by the following criteria:

Mandatory Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-214AC or SMA equivalent
Mounting Type: Surface Mount

Compatible Variations:

Forward voltage (Vf) may vary within typical rectifier tolerances (0.92 V to 1.3 V @ 1 A)
Reverse recovery time (trr) may be faster (Standard Recovery >500ns or Fast Recovery ≤500ns)
Reverse leakage current may be equal or lower
Operating temperature range may be equal or wider
Packaging format (Cut Tape, Tape & Reel, Bulk) does not affect electrical compatibility

All substitute parts listed maintain the 50 V / 1 A electrical specification and DO-214AC package footprint, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [µs/ns]	Ir @ 50V [µA]	Tj Range [°C]	Product Status
S1A-13	Diodes Incorporated	50	1	1.1	3 µs	5	-65 to 150	Discontinued
S1A-13-F	Diodes Incorporated	50	1	1.1	3 µs	5	-65 to 150	Active
CGRA4001-G	Comchip Technology	50	1	1.1	—	5	-55 to 150	Active
EGF1A	Fairchild Semiconductor	50	1	1.0	50 ns	10	-65 to 175	Active
ES1A	YAGEO	50	1	0.95	—	—	—	Active
ES1A-E3/5AT	Vishay General Semiconductor - Diodes Division	50	1	0.92	25 ns	5	-55 to 155	Active
ES1A-E3/61T	Vishay General Semiconductor - Diodes Division	50	1	0.92	25 ns	5	-55 to 150	Active
ES1A-LTP	Micro Commercial Co	50	1	0.95	35 ns	5	-65 to 175	Not For New Designs
GF1A	onsemi	50	1	1.0	2 µs	5	-65 to 175	Not For New Designs
GS1A-LTP	Micro Commercial Co	50	1	1.0	—	10	-55 to 150	Not For New Designs
RGF1A	Fairchild Semiconductor	50	1	1.3	150 ns	5	-65 to 175	Active

Engineering Selection Recommendations

Primary Recommendation: S1A-13-F

The S1A-13-F is the direct equivalent manufactured by Diodes Incorporated with identical electrical specifications to the S1A-13. This part carries Active product status and is available in Cut Tape and Digi-Reel packaging formats. Selection of S1A-13-F eliminates any parametric variation and maintains design continuity with the original specification.

Secondary Recommendations (Active Status):

ES1A-E3/5AT and ES1A-E3/61T (Vishay General Semiconductor - Diodes Division) are functionally compatible alternatives with improved fast recovery characteristics (25 ns trr). These parts are ROHS3 compliant and REACH unaffected. The lower forward voltage (0.92 V @ 1 A) provides reduced power dissipation compared to the S1A-13 specification.

EGF1A (Fairchild Semiconductor) offers fast recovery performance (50 ns trr) with extended operating temperature range (-65°C to 175°C). This part is suitable for applications requiring enhanced thermal performance.

CGRA4001-G (Comchip Technology) maintains standard recovery characteristics matching the S1A-13 and is available in Tape & Reel packaging.

RGF1A (Fairchild Semiconductor) provides extended temperature range (-65°C to 175°C) with fast recovery operation (150 ns trr).

Not Recommended for New Designs:

ES1A-LTP, GF1A, and GS1A-LTP carry "Not For New Designs" product status and should be used only for legacy system maintenance or repair applications where original part sourcing is unavailable.

Frequently Asked Questions (FAQ)

Q: Can S1A-13-F be used as a direct replacement for S1A-13?

A: Yes. S1A-13-F is manufactured by the same supplier (Diodes Incorporated) with identical electrical specifications: 50 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage at 1 A, and 3 µs reverse recovery time. The part is pin-compatible in the DO-214AC SMA package and carries Active product status.

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

A: Standard recovery diodes (S1A-13, GF1A) exhibit reverse recovery times greater than 500 ns. Fast recovery diodes (ES1A-E3/5AT, ES1A-E3/61T, EGF1A, RGF1A) have reverse recovery times of 500 ns or less. Fast recovery operation reduces switching losses in high-frequency applications but may increase cost. Both types are electrically compatible for 50 V / 1 A applications.

Q: Are all substitute parts available in the same packaging format?

A: No. Packaging formats vary across manufacturers. S1A-13-F is available in Cut Tape and Digi-Reel formats. ES1A-E3/5AT is supplied in Tape & Reel. ES1A-E3/61T is available in Cut Tape & Digi-Reel. EGF1A is supplied in Bulk. CGRA4001-G is available in Tape & Reel. Verify packaging compatibility with your procurement and assembly processes before selection.

Q: What is the significance of forward voltage variation among substitute parts?

A: Forward voltage (Vf) ranges from 0.92 V to 1.3 V across the substitute parts listed. Lower forward voltage reduces power dissipation and heat generation in the diode. Higher forward voltage increases power dissipation. For most general-purpose rectification applications, this variation is acceptable. Verify forward voltage impact on circuit performance in applications with tight power budgets or thermal constraints.

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

A: Parts designated "Not For New Designs" (ES1A-LTP, GF1A, GS1A-LTP) are in mature or declining production phases. Manufacturers recommend these parts only for sustaining existing products or repair applications. For new circuit designs, select parts with Active product status: S1A-13-F, ES1A-E3/5AT, ES1A-E3/61T, EGF1A, CGRA4001-G, or RGF1A.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance certification. This ensures compatibility with environmental and regulatory requirements for electronic component manufacturing and assembly.

Q: Can reverse recovery time affect circuit performance?

A: Yes. Reverse recovery time (trr) determines how quickly the diode transitions from forward conduction to reverse blocking. Faster recovery (25 ns to 150 ns) reduces switching transients and is beneficial in high-frequency switching applications. Standard recovery (2 µs to 3 µs) is adequate for low-frequency rectification. Select based on circuit switching frequency and transient performance requirements.

Q: What is the operating temperature range significance?

A: Operating temperature range defines the junction temperature limits for reliable operation. The S1A-13 operates from -65°C to 150°C. Some substitutes (EGF1A, GF1A, ES1A-LTP, RGF1A) extend to 175°C, providing margin for high-temperature environments. Others (CGRA4001-G, ES1A-E3/5AT, ES1A-E3/61T, GS1A-LTP) limit to 150°C or 155°C. Verify application thermal requirements before selection.

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