S3AB-TP Equivalent & Substitute Parts

Part Overview

The S3AB-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AA (SMB) package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. The diode exhibits standard recovery characteristics with forward voltage of 1.15 V at 3 A and reverse leakage current of 10 µA at 50 V.

Due to its obsolete product status, identification of functionally equivalent and pin-compatible substitute parts is necessary for design continuity, maintenance applications, and component sourcing. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and recovery speed variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15	V @ 3 A
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Speed Classification	Standard Recovery >500ns	-
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the S3AB-TP are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AA, SMB (surface mount)
Mounting Type: Surface Mount

Secondary Compatibility Considerations:

Forward voltage (Vf) at rated current
Reverse leakage current (Ir) at rated voltage
Recovery speed classification (Standard or Fast Recovery acceptable)
Operating temperature range
RoHS and REACH compliance status

Substitute parts are classified into two categories: Direct Electrical Equivalents (matching 3 A current rating) and Functional Alternatives (reduced current rating but compatible package and voltage rating). The SURS8105T3G-VF01 is classified as a functional alternative due to its 1 A current rating, which is below the 3 A specification of the main part.

Parameter Comparison

Parameter	S3AB-TP (Main)	ES3AB-13-F	RS3AB-13-F	S3AB	S3AB-13-F	SURS8105T3G-VF01
Manufacturer	Micro Commercial Co	Diodes Inc	Diodes Inc	Diodes Inc	Diodes Inc	onsemi
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 3 A	900 mV @ 3 A	1.3 V @ 3 A	1.15 V @ 3 A	1.15 V @ 3 A	875 mV @ 1 A
Speed Classification	Standard >500ns	Fast ≤500ns	Fast ≤500ns	Standard >500ns	Standard >500ns	Fast ≤500ns
Reverse Recovery Time (trr)	-	25 ns	150 ns	2 µs	-	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	2 µA @ 50 V
Capacitance @ Vr, F	-	45pF @ 4V, 1MHz	50pF @ 4V, 1MHz	40pF @ 4V, 1MHz	40pF @ 4V, 1MHz	-
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 175°C
Product Status	Not For New Designs	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	-	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Recommended Primary Substitutes (3 A Rating, Active Status):

ES3AB-13-F (Diodes Incorporated) is the preferred substitute for new designs and maintenance applications. This part maintains the 50 V / 3 A electrical specification with improved forward voltage characteristics (900 mV vs. 1.15 V at 3 A), resulting in lower power dissipation. Fast recovery speed (≤500ns, 25 ns trr) provides superior switching performance compared to the standard recovery S3AB-TP. Available in Cut Tape and Digi-Reel packaging with 19,310 units in stock. Active product status ensures long-term availability and supply chain stability.

S3AB-13-F (Diodes Incorporated) provides electrical equivalence with identical forward voltage (1.15 V @ 3 A) and reverse leakage (10 µA @ 50 V) to the S3AB-TP. Standard recovery speed matches the original part characteristics. Extended operating temperature range (-65°C to 150°C) accommodates wider thermal environments. Available in Cut Tape and Digi-Reel packaging with 38,200 units in stock. Active product status supports long-term component sourcing.

RS3AB-13-F (Diodes Incorporated) offers the 50 V / 3 A specification with fast recovery characteristics (≤500ns, 150 ns trr) and superior reverse leakage performance (5 µA @ 50 V). Forward voltage is slightly elevated at 1.3 V @ 3 A. Extended operating temperature range (-65°C to 150°C) and Tape & Reel packaging provide design flexibility. Active product status with 21,009 units in stock.

Functional Alternative (Reduced Current Rating):

SURS8105T3G-VF01 (onsemi) is suitable only for applications where the circuit current requirement does not exceed 1 A. This part is not a direct substitute due to its 1 A current rating versus the 3 A specification of S3AB-TP. However, it maintains 50 V voltage rating, DO-214AA package compatibility, and offers superior performance characteristics including fast recovery (35 ns trr), low forward voltage (875 mV @ 1 A), and minimal reverse leakage (2 µA @ 50 V). AEC-Q101 automotive qualification and extended temperature range (-65°C to 175°C) support demanding applications. Use only when circuit design permits reduced current capacity.

Obsolete Alternative (Not Recommended):

S3AB (Diodes Incorporated) is classified as Obsolete and should not be selected for new designs or long-term maintenance applications despite electrical equivalence to S3AB-TP. This part is retained in the substitute list for reference only in legacy system documentation.

Frequently Asked Questions (FAQ)

Q: Can ES3AB-13-F directly replace S3AB-TP in existing circuits?

A: Yes. ES3AB-13-F maintains the 50 V reverse voltage and 3 A current rating required by S3AB-TP. Both parts use identical DO-214AA (SMB) surface mount packaging. The lower forward voltage (900 mV vs. 1.15 V) and faster recovery speed (25 ns vs. >500ns) of ES3AB-13-F provide improved performance characteristics. No circuit modifications are required for pin-compatible substitution.

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

A: Recovery speed refers to the time required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Standard Recovery diodes (S3AB-TP, S3AB-13-F) exhibit recovery times exceeding 500 nanoseconds, suitable for low-frequency rectification and general-purpose applications. Fast Recovery diodes (ES3AB-13-F, RS3AB-13-F, SURS8105T3G-VF01) achieve recovery times of 500 nanoseconds or less, reducing switching losses and enabling operation at higher frequencies. Selection depends on circuit switching frequency and efficiency requirements.

Q: Why is SURS8105T3G-VF01 listed as a substitute if it has only 1 A rating?

A: SURS8105T3G-VF01 is included as a functional alternative for applications where circuit current does not exceed 1 A. It maintains the 50 V voltage specification and DO-214AA package compatibility. This part is not a direct substitute for the 3 A S3AB-TP but serves as an option for reduced-current designs requiring superior performance characteristics (fast recovery, low forward voltage, automotive qualification). Circuit current requirements must be verified before selection.

Q: What does "Not For New Designs" status mean for S3AB-TP?

A: "Not For New Designs" indicates that the S3AB-TP has reached end-of-life and the manufacturer no longer recommends its use in new product development. Existing inventory may remain available for a limited period, but long-term supply cannot be guaranteed. For new designs and maintenance applications, selection of an Active-status substitute part (ES3AB-13-F, S3AB-13-F, or RS3AB-13-F) is required to ensure component availability and design longevity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (ES3AB-13-F, RS3AB-13-F, S3AB, S3AB-13-F, SURS8105T3G-VF01) maintain ROHS3 Compliant status, matching the environmental compliance of the original S3AB-TP. All parts are also REACH Unaffected, confirming regulatory compliance for European and international markets.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel (ES3AB-13-F, S3AB-13-F), Tape & Reel (RS3AB-13-F), and unspecified packaging (S3AB, SURS8105T3G-VF01). All parts use identical DO-214AA (SMB) surface mount package geometry. Packaging selection depends on production volume, assembly equipment compatibility, and supply chain requirements. Verify packaging availability with component suppliers before design finalization.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) represents the voltage drop across the diode during forward conduction. S3AB-TP exhibits 1.15 V @ 3 A, while ES3AB-13-F provides 900 mV @ 3 A. Lower forward voltage reduces power dissipation and heat generation, improving circuit efficiency. In rectifier applications, this difference directly impacts output voltage and thermal management requirements. For precision applications, forward voltage variation must be considered in circuit design calculations.

Q: Can substitute parts be mixed in the same circuit board assembly?

A: Yes, provided all selected parts meet the circuit's electrical requirements (50 V minimum, 3 A minimum for direct equivalents). Mixing parts with different recovery speeds (Standard vs. Fast) is acceptable in most applications but may introduce minor timing variations in switching circuits. For critical applications requiring matched performance characteristics, consistent part selection across the assembly is recommended.

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