SMBYT03-400 Equivalent & Substitute Parts

Part Overview

The SMBYT03-400 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 400 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing production and maintenance applications. Equivalent parts must maintain electrical performance across voltage, current, and thermal specifications while accommodating available packaging and supplier options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	60	ns
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Package / Case	DO-214AB, SMC	-
Operating Temperature - Junction	-40 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SMBYT03-400 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.5 V @ 3 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) preferred for performance parity
Reverse Recovery Time (trr): Lower values indicate improved switching performance
Current - Reverse Leakage @ Vr: Must not exceed 10 µA @ 400 V
Operating Temperature - Junction: Must accommodate application thermal range
RoHS Status: ROHS3 Compliant required

Substitute parts are grouped by their adherence to these criteria and their product status (Active, Last Time Buy, or Not For New Designs).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Tj (Min-Max) [°C]	Product Status
SMBYT03-400	STMicroelectronics	400	3	1.5 @ 3 A	Fast Recovery ≤ 500ns	60	10 @ 400 V	-40 to 150	Obsolete
ES3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.1 @ 3 A	Fast Recovery ≤ 500ns	50	10 @ 400 V	-55 to 150	Active
S3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.15 @ 2.5 A	Standard Recovery >500ns	2500	10 @ 400 V	-55 to 150	Active
ACGRCT302-HF	Comchip Technology	400	3	1.0 @ 3 A	Fast Recovery ≤ 500ns	-	5 @ 400 V	-65 to 175	Last Time Buy
ER3G-TP	Micro Commercial Co	400	3	1.25 @ 3 A	Fast Recovery ≤ 500ns	35	5 @ 400 V	-50 to 175	Active
S3G-13-F	Diodes Incorporated	400	3	1.15 @ 3 A	Standard Recovery >500ns	-	10 @ 400 V	-65 to 150	Active
S3G-TP	Micro Commercial Co	400	3	1.2 @ 3 A	Standard Recovery >500ns	-	10 @ 400 V	-55 to 150	Not For New Designs

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Active Status, Fast Recovery):

ES3G-E3/57T (Vishay) and ER3G-TP (Micro Commercial Co) are the primary substitutes for SMBYT03-400. Both maintain 400 V / 3 A ratings with fast recovery characteristics (≤ 500ns). ES3G-E3/57T offers superior forward voltage performance (1.1 V @ 3 A) and faster recovery time (50 ns). ER3G-TP provides comparable performance with 35 ns recovery time and lower reverse leakage (5 µA). Both are ROHS3 compliant and available in active production status.

Tier 2 - Functional Equivalents (Active Status, Standard Recovery):

S3G-13-F (Diodes Incorporated) and S3G-E3/57T (Vishay) maintain electrical equivalence with standard recovery characteristics (>500ns). These parts are suitable for applications where switching speed is not performance-critical. S3G-13-F extends the lower operating temperature to -65°C, providing broader thermal coverage. Both are ROHS3 compliant and in active production.

Tier 3 - Limited Availability:

ACGRCT302-HF (Comchip Technology) is designated Last Time Buy and includes automotive qualification (AEC-Q101) with extended temperature range (-65 to 175°C). This part is suitable for automotive applications requiring qualification documentation but should not be selected for new designs due to end-of-life status.

S3G-TP (Micro Commercial Co) is marked Not For New Designs and should be avoided for new product development.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited), matching the original SMBYT03-400 specifications.

Frequently Asked Questions (FAQ)

Q: Can ES3G-E3/57T directly replace SMBYT03-400 in all applications?

A: ES3G-E3/57T meets all primary electrical specifications (400 V, 3 A) and maintains fast recovery performance. The lower forward voltage (1.1 V @ 3 A versus 1.5 V @ 3 A) and faster recovery time (50 ns versus 60 ns) represent performance improvements. Packaging is identical (DO-214AB, SMC). Verification of thermal operating range (-55 to 150°C) against application requirements is necessary.

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

A: Fast Recovery diodes (≤ 500ns) exhibit shorter reverse recovery time, enabling higher switching frequencies and reduced switching losses. Standard Recovery diodes (>500ns) have longer recovery times and are suitable for lower-frequency applications. SMBYT03-400 specifies Fast Recovery; substitutes with Standard Recovery (S3G-E3/57T, S3G-13-F, S3G-TP) are functionally equivalent but not performance-equivalent for high-frequency switching applications.

Q: Are packaging differences between Cut Tape (CT) and Tape & Reel (TR) significant for component selection?

A: Packaging format (Cut Tape versus Tape & Reel) affects supply chain logistics and handling but does not alter electrical or mechanical compatibility. Both formats use identical DO-214AB, SMC package geometry. Selection between CT and TR depends on production volume and assembly equipment compatibility, not component performance.

Q: Why is ACGRCT302-HF marked Last Time Buy despite meeting electrical specifications?

A: Last Time Buy status indicates the manufacturer has announced end-of-production. While ACGRCT302-HF currently meets all electrical and compliance requirements, inventory is finite. This designation signals that long-term availability cannot be guaranteed. For new designs, Active status parts (ES3G-E3/57T, ER3G-TP, S3G-13-F) are preferred.

Q: What does AEC-Q101 qualification on ACGRCT302-HF signify?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. ACGRCT302-HF carries this certification, indicating suitability for automotive applications with documented reliability testing. This qualification is not present on other substitute parts listed. Selection of ACGRCT302-HF is appropriate only for automotive applications requiring this specific qualification.

Q: Can S3G-TP be used as a substitute despite Not For New Designs status?

A: S3G-TP meets electrical specifications but carries Not For New Designs designation, indicating the manufacturer recommends against its use in new product development. This status typically precedes Last Time Buy and eventual discontinuation. For new designs, Active status alternatives (ES3G-E3/57T, ER3G-TP, S3G-13-F) should be selected.

Q: How do reverse leakage current differences affect component selection?

A: SMBYT03-400 specifies 10 µA @ 400 V reverse leakage. ER3G-TP and ACGRCT302-HF specify 5 µA @ 400 V, representing lower leakage. Lower reverse leakage reduces standby power consumption and heat generation. This difference is significant in high-voltage, low-current applications but negligible in standard rectification circuits. Both specifications are acceptable for general-purpose rectification.

Q: What thermal considerations apply when selecting between substitute parts?

A: SMBYT03-400 operates from -40 to 150°C junction temperature. Substitute parts offer varying ranges: ES3G-E3/57T and S3G-E3/57T (-55 to 150°C), ER3G-TP (-50 to 175°C), ACGRCT302-HF (-65 to 175°C), and S3G-13-F (-65 to 150°C). Selection must ensure the substitute's operating range encompasses the application's thermal environment. Extended temperature ranges provide design margin but do not alter electrical performance within the common range.

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