S1D/1 Equivalent & Substitute Parts Reference

Part Overview

The S1D/1 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 200 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The S1D/1 operates across a junction temperature range of -55°C to 150°C and exhibits standard recovery characteristics with a reverse recovery time of 1.8 µs. Due to its obsolete status, active production alternatives with equivalent or superior electrical performance are required for new procurement and design continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	1	µA @ 200 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the S1D/1 are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V (exact match required)
Current - Average Rectified (Io): 1 A (exact match) or higher (1.5 A acceptable for derating applications)
Package / Case: DO-214AC or SMA (identical mechanical compatibility)
Mounting Type: Surface Mount (identical assembly compatibility)

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application circuit requirements
Reverse Recovery Time (trr): Standard recovery (>500 ns) or fast recovery (≤500 ns) both acceptable
Current - Reverse Leakage @ Vr: Lower values indicate superior performance
Operating Temperature - Junction: Must encompass or exceed application requirements
RoHS Compliance: Active substitutes are ROHS3 compliant; obsolete part is non-compliant

Substitutes are classified into two categories:

Category A - Direct Electrical Equivalents (1 A rated current): Parts with identical 200 V / 1 A ratings in DO-214AC/SMA package. These provide pin-for-pin and functional equivalence.

Category B - Higher Current Rated Alternatives (1.5 A rated current): Parts with 200 V / 1.5 A ratings in DO-214AC/SMA package. These provide superior current handling capability and are suitable for applications requiring design margin or future capacity expansion.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns/µs]	Ir @ Vr [µA]	Package	Product Status	RoHS
S1D/1	Vishay	200	1	1.1 @ 1 A	1.8 µs	1 @ 200 V	DO-214AC	Obsolete	Non-compliant
S1D	YAGEO	200	1	1.1	—	—	DO-214AC	Active	ROHS3
BYG20D	Taiwan Semiconductor	200	1.5	1.4 @ 1.5 A	75 ns	1 @ 200 V	DO-214AC	Active	ROHS3
EGF1D	onsemi	200	1	1 @ 1 A	50 ns	10 @ 200 V	DO-214AC	Not For New Designs	ROHS3
ES1D	EVVO Semi	200	1	1 @ 1 A	35 ns	5 @ 200 V	DO-214AC	Active	ROHS3
ES1D-13-F	Diodes Incorporated	200	1	0.92 @ 1 A	25 ns	5 @ 200 V	DO-214AC	Active	ROHS3
GF1D	Fairchild Semiconductor	200	1	1 @ 1 A	2 µs	5 @ 200 V	DO-214AC	Active	—
S1D-13-F	Diodes Incorporated	200	1	1.1 @ 1 A	3 µs	5 @ 200 V	DO-214AC	Active	ROHS3
STTH102A	STMicroelectronics	200	1	0.97 @ 1 A	20 ns	1 @ 200 V	DO-214AC	Active	ROHS3
STTH102AY	STMicroelectronics	200	1	0.97 @ 1 A	20 ns	1 @ 200 V	DO-214AC	Active	ROHS3
STTH1R02A	STMicroelectronics	200	1.5	1 @ 1.5 A	30 ns	3 @ 200 V	DO-214AC	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (1 A Rated Current):

The following parts provide direct electrical and mechanical equivalence to the S1D/1 with active product status and ROHS3 compliance:

ES1D-13-F (Diodes Incorporated): Active status with superior fast recovery characteristics (25 ns trr), lowest forward voltage (0.92 V @ 1 A), and highest inventory availability (550,400 pcs). Recommended for new designs requiring RoHS compliance and optimal performance.
STTH102A / STTH102AY (STMicroelectronics): Active status with fast recovery (20 ns trr), low forward voltage (0.97 V @ 1 A), and low reverse leakage (1 µA @ 200 V). STTH102AY includes automotive-grade qualification (-40°C to 175°C junction temperature range). Suitable for applications requiring automotive or extended temperature performance.
S1D (YAGEO): Active status with ROHS3 compliance. Direct part number match to base product. Provides straightforward cross-reference for procurement.
S1D-13-F (Diodes Incorporated): Active status with ROHS3 compliance. Maintains original forward voltage specification (1.1 V @ 1 A) and extended temperature range (-65°C to 150°C).

For Higher Current Applications (1.5 A Rated Current):

BYG20D (Taiwan Semiconductor): Active status with 1.5 A rating, fast recovery (75 ns trr), and ROHS3 compliance. Suitable for applications requiring design margin or future current expansion.
STTH1R02A (STMicroelectronics): Active status with 1.5 A rating, fast recovery (30 ns trr), and ROHS3 compliance. Provides superior performance characteristics compared to BYG20D.

Parts Not Recommended for New Designs:

EGF1D (onsemi): Marked "Not For New Designs" despite active inventory. Avoid for new product development.
GF1D (Fairchild Semiconductor): RoHS compliance status not specified. Verify compliance requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.5 A rated diode (BYG20D or STTH1R02A) as a direct replacement for the 1 A S1D/1?

A: Yes. A higher current-rated diode operates within its safe operating region when used in a 1 A application. The 1.5 A rating provides design margin and improved thermal performance. Verify that the forward voltage drop (1.4 V for BYG20D, 1 V for STTH1R02A) is acceptable for your circuit.

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

A: The S1D/1 exhibits standard recovery with 1.8 µs reverse recovery time. Fast recovery substitutes (STTH102A, ES1D-13-F, STTH1R02A) have reverse recovery times of 20-50 ns. Fast recovery reduces switching losses and is beneficial in high-frequency applications. Standard recovery alternatives (S1D-13-F, GF1D) are suitable for low-frequency rectification.

Q: Is the DO-214AC package identical to the SMA package?

A: Yes. DO-214AC and SMA refer to the same surface mount package. Both designations are used interchangeably in the industry. All substitute parts listed are mechanically compatible with the original S1D/1 package.

Q: Why is the S1D/1 marked as obsolete?

A: The S1D/1 is no longer in active production by Vishay. Obsolete status indicates that new inventory from the original manufacturer is unavailable. Active substitutes from other manufacturers provide equivalent or superior performance with ongoing production support.

Q: Which substitute offers the best performance?

A: Performance depends on application requirements. ES1D-13-F offers the lowest forward voltage (0.92 V) and fastest recovery (25 ns). STTH102A and STTH102AY offer the lowest reverse leakage (1 µA, matching the original). STTH102AY includes automotive-grade qualification for temperature-critical applications.

Q: Are all substitute parts RoHS compliant?

A: All listed substitutes except GF1D are ROHS3 compliant. The original S1D/1 is RoHS non-compliant. If RoHS compliance is required, select from ES1D-13-F, STTH102A, STTH102AY, STTH1R02A, S1D, S1D-13-F, BYG20D, or ES1D.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes, provided all selected parts meet the circuit's voltage, current, and temperature requirements. Mixing parts with different forward voltage drops may affect circuit performance if voltage regulation is critical. Verify forward voltage compatibility with your design.

Q: What is the minimum operating temperature for the S1D/1 and its substitutes?

A: The S1D/1 operates from -55°C to 150°C junction temperature. Most substitutes operate from -55°C to 175°C, providing extended high-temperature capability. STTH102AY extends the low-temperature range to -40°C for automotive applications.

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