ES3B/7T Equivalent & Substitute Parts

Part Overview

The ES3B/7T is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The ES3B/7T features fast recovery characteristics with a reverse recovery time of 30 ns and forward voltage of 900 mV at 3 A, suitable for standard rectification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 3 A	mV @ A
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	10	µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution of the ES3B/7T is determined by the following critical parameters: voltage rating (100 V DC reverse), current rating (3 A average rectified), forward voltage characteristics, recovery speed classification, and package type (DO-214AB SMC surface mount). Parts are grouped into three categories based on substitution suitability:

Category 1: Parametric Equivalents (Vishay ES3B Series) These parts maintain identical electrical specifications to the ES3B/7T across all critical parameters. Differences exist only in packaging format (Cut Tape, Tape & Reel) and product status (Active vs. Obsolete). The ES3B-E3/57T, ES3B-E3/9AT, ES3B-M3/57T, ES3B-M3/9AT, ES3BHE3_A/H, and ES3BHE3_A/I all meet the core electrical requirements with 100 V rating, 3 A current, 900 mV forward voltage, and 30 ns reverse recovery time. The automotive-qualified variants (ES3BHE3_A/H and ES3BHE3_A/I) include AEC-Q101 certification and are suitable for applications requiring automotive-grade components.

Category 2: Manufacturer-Recommended Alternatives (Different Manufacturers) The ES3B (Taiwan Semiconductor Corporation), S3B-13-F (Diodes Incorporated), and S3B-TP (Micro Commercial Co) provide functional equivalence with minor electrical variations. These parts maintain the 100 V / 3 A core ratings and DO-214AB package but exhibit differences in forward voltage (950 mV to 1.2 V at 3 A), recovery speed classification, and operating temperature ranges. The S3B-13-F operates at standard recovery speed (>500ns) rather than fast recovery, while S3B-TP is marked as Not For New Designs.

Category 3: Higher Voltage Alternative The STTH302S (STMicroelectronics) provides a 200 V rated alternative with identical 3 A current rating and DO-214AB package. This part is suitable only when higher voltage margin is required, as it introduces different electrical characteristics including lower reverse leakage (3 µA vs. 10 µA) and higher maximum junction temperature (175°C).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	trr [ns]	Ir @ Vr [µA]	Speed	Product Status	RoHS Status
ES3B/7T	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Obsolete	Non-compliant
ES3B-E3/57T	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
ES3B-E3/9AT	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
ES3B-M3/57T	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
ES3B-M3/9AT	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
ES3BHE3_A/H	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
ES3BHE3_A/I	Vishay	100	3	900	30	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
ES3B	Taiwan Semiconductor	100	3	950	35	10 @ 100V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant
S3B-13-F	Diodes Incorporated	100	3	1150	-	10 @ 100V	Standard Recovery >500ns	Active	ROHS3 Compliant
S3B-TP	Micro Commercial Co	100	3	1200	-	10 @ 100V	Standard Recovery >500ns	Not For New Designs	ROHS3 Compliant
STTH302S	STMicroelectronics	200	3	950	35	3 @ 200V	Fast Recovery ≤ 500ns	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

The Vishay ES3B series parametric equivalents (ES3B-E3/57T, ES3B-E3/9AT, ES3B-M3/57T, ES3B-M3/9AT) provide direct electrical and functional equivalence to the obsolete ES3B/7T. These parts maintain identical voltage, current, forward voltage, and recovery time specifications while offering Active product status and ROHS3 compliance. Selection among these variants depends on packaging requirements: ES3B-E3/57T is supplied in Cut Tape format, while ES3B-E3/9AT and the M3 variants are supplied in Tape & Reel format. The M3 variants offer lower inventory levels (848–1173 pcs) compared to E3 variants (4742–5730 pcs).

For applications requiring automotive-grade qualification, the ES3BHE3_A/H and ES3BHE3_A/I variants provide AEC-Q101 certification with identical electrical specifications and Tape & Reel packaging. These are suitable for automotive rectification circuits where component qualification is mandatory.

Secondary Substitutes (Functional Equivalence with Electrical Variations)

The Taiwan Semiconductor ES3B and Diodes Incorporated S3B-13-F provide functional substitution with acceptable electrical variations. The Taiwan Semiconductor ES3B exhibits slightly higher forward voltage (950 mV vs. 900 mV) and reverse recovery time (35 ns vs. 30 ns) but maintains fast recovery classification and Active status. The S3B-13-F operates at standard recovery speed (>500ns) rather than fast recovery, resulting in higher forward voltage (1150 mV) and is suitable only for applications where recovery speed is not performance-critical.

The Micro Commercial Co S3B-TP is marked as Not For New Designs and should be avoided for new circuit implementations despite its Active inventory status.

Higher Voltage Alternative

The STMicroelectronics STTH302S provides a 200 V rated option suitable only when circuit requirements demand higher voltage margin than the 100 V rating. This part introduces different electrical characteristics (lower reverse leakage, higher maximum junction temperature) and should be selected only when voltage derating analysis requires the additional margin.

Frequently Asked Questions (FAQ)

Q: Can the ES3B-E3/57T directly replace the obsolete ES3B/7T in existing designs?

A: Yes. The ES3B-E3/57T is a parametric equivalent with identical voltage (100 V), current (3 A), forward voltage (900 mV @ 3 A), and reverse recovery time (30 ns) specifications. The primary difference is packaging format (Cut Tape vs. the original format) and product status (Active vs. Obsolete). Electrical performance in the circuit is equivalent.

Q: What is the difference between the ES3B-E3/9AT and ES3B-M3/9AT variants?

A: Both parts are parametric equivalents with identical electrical specifications. The difference lies in the base product designation (E3 vs. M3) and inventory availability. ES3B-E3/9AT has higher inventory (4742 pcs) compared to ES3B-M3/9AT (1173 pcs). Both are supplied in Tape & Reel format and are suitable for automated assembly.

Q: Why does the S3B-13-F have higher forward voltage (1150 mV) than the ES3B/7T (900 mV)?

A: The S3B-13-F operates at standard recovery speed (>500ns) rather than fast recovery (≤500ns). This classification difference results in different semiconductor junction characteristics and higher forward voltage drop. The S3B-13-F is suitable for applications where switching speed is not performance-critical but should not be used in circuits optimized for the fast recovery characteristics of the original ES3B/7T.

Q: Are the automotive-qualified variants (ES3BHE3_A/H and ES3BHE3_A/I) interchangeable?

A: Yes. Both variants are AEC-Q101 qualified with identical electrical specifications (100 V, 3 A, 900 mV forward voltage, 30 ns recovery time). Selection between them depends on packaging reel configuration (H vs. I designation) specified by the assembly equipment or supplier requirements.

Q: When should the STTH302S be selected instead of the ES3B equivalents?

A: The STTH302S should be selected only when circuit design requires a 200 V voltage rating. This part is not a direct substitute but rather a higher-voltage alternative. Use of the STTH302S in a 100 V circuit introduces unnecessary cost and different electrical characteristics (lower reverse leakage, higher junction temperature rating) without functional benefit.

Q: Is the S3B-TP suitable for new product designs?

A: No. The S3B-TP is marked as Not For New Designs by the manufacturer. While it maintains the 100 V / 3 A ratings and is currently in stock, it should not be selected for new circuit implementations. Use active-status alternatives such as the Vishay ES3B series or Diodes Incorporated S3B-13-F instead.

Q: What packaging formats are available for the ES3B equivalents?

A: The Vishay ES3B series is available in three packaging formats: Cut Tape (CT) for ES3B-E3/57T, Tape & Reel (TR) for ES3B-E3/9AT, ES3B-M3/57T, ES3B-M3/9AT, ES3BHE3_A/H, and ES3BHE3_A/I. Selection depends on assembly process requirements and volume. Cut Tape format is suitable for lower-volume manual or semi-automated assembly, while Tape & Reel format is optimized for high-speed automated pick-and-place equipment.

Q: Do all substitute parts meet RoHS compliance requirements?

A: The obsolete ES3B/7T is RoHS non-compliant. All recommended substitute parts (Vishay ES3B series, Taiwan Semiconductor ES3B, Diodes Incorporated S3B-13-F, Micro Commercial Co S3B-TP, and STMicroelectronics STTH302S) are ROHS3 compliant, meeting current environmental and regulatory requirements for new product designs and manufacturing.

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