Equivalent & Substitute Parts for S1B General Purpose Rectifier Diode

Part Overview

The onsemi S1B is a general purpose rectifier diode rated for 100 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 This device is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product portfolio. Alternative components with equivalent or superior electrical characteristics are available from multiple manufacturers to support ongoing production requirements and new design initiatives.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	1	µA @ 100 V
Package / Case	DO-214AC, SMA	-
Operating Temperature - Junction	-55°C ~ 150°C	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the S1B are classified into two categories based on electrical and mechanical compatibility:

Direct Package Substitutes (DO-214AC / SMA Package): Parts maintaining the same DO-214AC (SMA) surface mount package footprint with equivalent or improved electrical performance. These include CGRA4002-G, ES1B-E3/61T, ES1B-LTP, ESH1B-E3/5AT, ESH1B-E3/61T, S1B-13-F, US1B-13-F, and ACGRA4002-HF. All maintain 100 V reverse voltage rating and 1 A average rectified current capability.

Alternative Package Substitutes (DO-214BA / GF1 Package): Parts with different surface mount package geometry (DO-214BA) but equivalent electrical ratings. These include EGF1B-E3/5CA and EGF1B-E3/67A. These require PCB layout modification due to different package footprint.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Package compatibility or functional equivalence

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Ir @ Vr	Package	Product Status
S1B	onsemi	100 V	1 A	1.1 V @ 1 A	Standard >500ns	1.8 µs	1 µA @ 100 V	DO-214AC	Not For New Designs
CGRA4002-G	Comchip Technology	100 V	1 A	1.1 V @ 1 A	Fast ≤500ns	-	5 µA @ 100 V	DO-214AC	Active
EGF1B-E3/5CA	Vishay General Semiconductor	100 V	1 A	1 V @ 1 A	Fast ≤500ns	50 ns	5 µA @ 100 V	DO-214BA	Active
EGF1B-E3/67A	Vishay General Semiconductor	100 V	1 A	1 V @ 1 A	Fast ≤500ns	50 ns	5 µA @ 100 V	DO-214BA	Not For New Designs
ES1B-E3/61T	Vishay General Semiconductor	100 V	1 A	920 mV @ 1 A	Fast ≤500ns	25 ns	5 µA @ 100 V	DO-214AC	Active
ES1B-LTP	Micro Commercial Co	100 V	1 A	950 mV @ 1 A	Fast ≤500ns	35 ns	5 µA @ 100 V	DO-214AC	Not For New Designs
ESH1B-E3/5AT	Vishay General Semiconductor	100 V	1 A	900 mV @ 1 A	Fast ≤500ns	25 ns	1 µA @ 100 V	DO-214AC	Active
ESH1B-E3/61T	Vishay General Semiconductor	100 V	1 A	900 mV @ 1 A	Fast ≤500ns	25 ns	1 µA @ 100 V	DO-214AC	Active
S1B-13-F	Diodes Incorporated	100 V	1 A	1.1 V @ 1 A	Standard >500ns	3 µs	5 µA @ 100 V	DO-214AC	Active
US1B-13-F	Diodes Incorporated	100 V	1 A	1 V @ 1 A	Fast ≤500ns	50 ns	5 µA @ 100 V	DO-214AC	Active
ACGRA4002-HF	Comchip Technology	100 V	1 A	1.1 V @ 1 A	Standard >500ns	2.5 µs	5 µA @ 100 V	DO-214AC	Active

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Footprint):

Select from Active status parts with DO-214AC package: ES1B-E3/61T, ESH1B-E3/5AT, ESH1B-E3/61T, S1B-13-F, US1B-13-F, or ACGRA4002-HF. These maintain identical PCB footprint compatibility with the original S1B design.

For New Designs:

Prioritize Active status components. ES1B-E3/61T, ESH1B-E3/5AT, ESH1B-E3/61T, and US1B-13-F offer improved reverse recovery time (25–50 ns) compared to the S1B (1.8 µs), resulting in reduced switching losses and improved circuit efficiency. ACGRA4002-HF includes AEC-Q101 automotive qualification for applications requiring automotive-grade reliability.

For Existing Production Support:

CGRA4002-G, S1B-13-F, and US1B-13-F are available in high inventory quantities and maintain Active product status, ensuring long-term supply continuity.

For Alternative Package Consideration:

EGF1B-E3/5CA and EGF1B-E3/67A (DO-214BA package) provide superior electrical performance with lower forward voltage (1 V vs. 1.1 V) and faster recovery time (50 ns), but require PCB layout redesign due to different package footprint.

Compliance Verification:

All listed substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original S1B specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace S1B with any of the listed substitute parts?

A: Direct replacement without PCB modification is possible only with parts maintaining the DO-214AC (SMA) package: CGRA4002-G, ES1B-E3/61T, ES1B-LTP, ESH1B-E3/5AT, ESH1B-E3/61T, S1B-13-F, US1B-13-F, and ACGRA4002-HF. Parts with DO-214BA package (EGF1B-E3/5CA, EGF1B-E3/67A) require PCB footprint modification.

Q: What is the difference between Standard Recovery and Fast Recovery specifications?

A: Standard Recovery (>500 ns) indicates slower reverse recovery time, typical of older diode technology. Fast Recovery (≤500 ns) indicates faster switching characteristics, reducing switching losses and heat generation. The S1B uses Standard Recovery (1.8 µs), while most active substitutes employ Fast Recovery technology (25–50 ns).

Q: Why should I consider parts with "Not For New Designs" status?

A: Parts marked "Not For New Designs" (S1B, EGF1B-E3/67A, ES1B-LTP) are suitable for sustaining existing production but should not be selected for new circuit designs. Active status parts ensure manufacturer support and long-term availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original S1B specification.

Q: What is the significance of reverse recovery time (trr) in diode selection?

A: Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. Lower trr values (25–50 ns in fast recovery diodes) reduce switching losses and electromagnetic interference compared to higher values (1.8–3 µs in standard recovery diodes). Selection depends on circuit switching frequency and thermal management requirements.

Q: Can I use ACGRA4002-HF in non-automotive applications?

A: Yes. ACGRA4002-HF includes AEC-Q101 automotive qualification, but this certification does not restrict use in non-automotive applications. It indicates enhanced reliability testing and is suitable for any application requiring high reliability.

Q: What packaging options are available?

A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging formats. Selection depends on production volume and assembly equipment compatibility. All parts maintain identical electrical specifications regardless of packaging format.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) ranges from 900 mV to 1.1 V across substitute parts. Lower Vf values (900 mV in ESH1B variants) reduce power dissipation and heat generation compared to higher values (1.1 V in S1B, CGRA4002-G, ACGRA4002-HF). Selection should consider thermal budget and efficiency requirements.

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