SK34A-TP Schottky Diode 40V 3A DO-214AC Equivalent & Substitute Parts

Part Overview

The SK34A-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40V reverse voltage and 3A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The SK34A-TP operates across a junction temperature range of -50°C to 125°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 3 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 40 V	µA @ V
Capacitance @ Vr, F	250 pF @ 4V, 1MHz	pF @ V, MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-50°C to 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK34A-TP is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) Maximum: 40V
Current - Average Rectified (Io): 3A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Technology: Schottky
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Parametric Equivalent Classification: Parts meeting all primary equivalence criteria with identical electrical specifications are classified as parametric equivalents. The SK34A-LTP from Micro Commercial Co represents a direct parametric equivalent with active product status.

Similar Part Classification: Parts that maintain the 40V reverse voltage and 3A current rating but originate from different manufacturers or exhibit variations in secondary parameters (forward voltage, reverse leakage, capacitance, or temperature range) are classified as similar parts. These parts are electrically compatible for the specified voltage and current ratings but may exhibit different performance characteristics in specific applications.

Lower Current Rating Classification: Parts rated for 1A or 2A average rectified current are listed for reference but do not constitute direct substitutes for 3A applications due to insufficient current capacity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Reverse Leakage @ Vr [µA @ V]	Capacitance @ Vr, F [pF @ V, MHz]	Tj Range [°C]	Product Status
SK34A-TP	Micro Commercial Co	40	3	500 @ 3	500 @ 40	250 @ 4, 1	-50 to 125	Obsolete
SK34A-LTP	Micro Commercial Co	40	3	500 @ 3	500 @ 40	250 @ 4, 1	-50 to 125	Active
B340A-13-F	Diodes Incorporated	40	3	500 @ 3	500 @ 40	200 @ 4, 1	-55 to 150	Active
B340A-E3/5AT	Vishay General Semiconductor - Diodes Division	40	3	550 @ 3	500 @ 40	— @ —, —	-65 to 150	Active
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3	2000 @ 40	180 @ 4, 1	-55 to 125	Active
CDBA340-G	Comchip Technology	40	3	500 @ 3	500 @ 40	— @ —, —	-55 to 150	Active
CDBA340-HF	Comchip Technology	40	3	500 @ 3	500 @ 40	250 @ 4, 1	-50 to 150	Active

Engineering Selection Recommendations

Parametric Equivalent - Recommended Primary Substitute:

SK34A-LTP (Micro Commercial Co) is the recommended primary substitute. This part maintains identical electrical specifications to the SK34A-TP across all critical parameters and carries active product status. The SK34A-LTP is ROHS3 compliant and carries MSL 1 (Unlimited) rating, matching the original part's compliance profile. Procurement of SK34A-LTP eliminates obsolescence risk while preserving design performance characteristics.

Active Equivalent - Recommended Secondary Substitutes:

CDBA340-HF (Comchip Technology) provides parametric equivalence with identical forward voltage (500 mV @ 3A), reverse leakage (500 µA @ 40V), and capacitance (250 pF @ 4V, 1MHz) specifications. This part is ROHS3 compliant, MSL 1 rated, and carries active product status with extended temperature range (-50°C to 150°C). Tape & Reel packaging matches the original SK34A-TP format.

B340A-13-F (Diodes Incorporated) maintains 40V/3A ratings with identical forward voltage (500 mV @ 3A) and reverse leakage (500 µA @ 40V). This part includes automotive-grade qualification (AEC-Q101) and extended temperature range (-55°C to 150°C). ROHS3 compliance and MSL 1 rating are confirmed.

Alternative Substitutes - Application-Dependent Selection:

B340A-E3/5AT (Vishay General Semiconductor - Diodes Division) provides 40V/3A ratings with extended temperature range (-65°C to 150°C). Forward voltage is specified at 550 mV @ 3A, representing a 50 mV increase over the original specification. This part is suitable for applications where the higher forward voltage is acceptable and extended low-temperature operation is required.

B340LA-13-F (Diodes Incorporated) offers reduced forward voltage (450 mV @ 3A) compared to the original specification, providing improved efficiency in rectification circuits. Reverse leakage is specified at 2 mA @ 40V, representing a 4x increase over the original 500 µA specification. This part is suitable for applications where forward voltage reduction is prioritized and reverse leakage tolerance permits the higher specification.

CDBA340-G (Comchip Technology) maintains 40V/3A ratings with identical forward voltage (500 mV @ 3A) and reverse leakage (500 µA @ 40V). Extended temperature range (-55°C to 150°C) and active product status support long-term availability.

Frequently Asked Questions (FAQ)

Q: Can SK34A-LTP be used as a direct replacement for SK34A-TP?

A: Yes. SK34A-LTP is a parametric equivalent with identical electrical specifications across all critical parameters: 40V reverse voltage, 3A average rectified current, 500 mV forward voltage @ 3A, 500 µA reverse leakage @ 40V, and 250 pF capacitance @ 4V, 1MHz. Both parts use DO-214AC (SMA) surface mount packaging. SK34A-LTP carries active product status, eliminating obsolescence concerns.

Q: What is the difference between parametric equivalents and similar parts?

A: Parametric equivalents maintain identical electrical specifications across all critical parameters. Similar parts meet the primary voltage and current ratings (40V/3A) but may exhibit variations in secondary parameters such as forward voltage, reverse leakage current, or capacitance. Similar parts are electrically compatible for the specified voltage and current ratings but may exhibit different performance characteristics in specific circuit applications.

Q: Can I substitute a 1A or 2A rated diode for the SK34A-TP in a 3A application?

A: No. Parts rated for 1A or 2A average rectified current do not provide sufficient current capacity for applications requiring 3A operation. Using an undersized component will result in excessive junction temperature rise, reduced component lifetime, and potential circuit failure.

Q: What is the significance of the DO-214AC (SMA) package specification?

A: The DO-214AC package, commonly referred to as SMA, is a standardized surface mount package for small signal and rectifier diodes. All substitute parts listed maintain this package specification, ensuring mechanical and electrical compatibility with existing PCB layouts and soldering processes. Package compatibility eliminates the need for PCB redesign.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) represents the voltage drop across the diode during forward conduction. The SK34A-TP specifies 500 mV @ 3A. Substitute parts with identical 500 mV specifications (SK34A-LTP, B340A-13-F, CDBA340-G, CDBA340-HF) provide equivalent voltage drop performance. Parts with higher Vf (B340A-E3/5AT at 550 mV) will exhibit increased power dissipation. Parts with lower Vf (B340LA-13-F at 450 mV) will exhibit reduced power dissipation. Selection depends on circuit power budget and thermal management requirements.

Q: What does reverse leakage current specification indicate?

A: Reverse leakage current (Ir) represents the small current flowing through the diode when reverse biased. The SK34A-TP specifies 500 µA @ 40V. Most substitute parts maintain this specification. B340LA-13-F specifies 2 mA @ 40V, representing a 4x increase. Higher reverse leakage increases power dissipation in reverse bias conditions and may affect circuit performance in high-impedance applications. Selection depends on circuit sensitivity to reverse leakage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original SK34A-TP specification. All parts also carry MSL 1 (Unlimited) moisture sensitivity level rating, indicating no moisture sensitivity restrictions for storage or handling.

Q: What is the significance of AEC-Q101 automotive qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification (B340A-13-F, B340A-E3/5AT) have undergone additional reliability testing and are approved for automotive applications. This qualification is not required for general industrial or consumer applications but provides additional assurance of component reliability and consistency.

Q: Can I use a part with extended temperature range in place of the SK34A-TP?

A: Yes, provided the extended temperature range does not introduce design complications. The SK34A-TP operates from -50°C to 125°C. Substitute parts with extended ranges (such as -55°C to 150°C or -65°C to 150°C) are backward compatible with the original temperature specification. Extended temperature range provides additional operational margin but does not affect performance within the original temperature window.

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