SK13-LTP Equivalent & Substitute Parts

Part Overview

The SK13-LTP is a Schottky rectifier diode rated for 30 V DC reverse voltage and 1 A average rectified current in a DO-214AA (SMB) surface mount package. Manufactured by Micro Commercial Co, this component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing production requirements where this diode is currently deployed.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 30 V	µA
Capacitance @ Vr, F	130 pF @ 4V, 1MHz	pF
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK13-LTP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io): 1 A minimum
Technology: Schottky
Package / Case: DO-214AA or SMB compatible
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Forward voltage (Vf) within acceptable operating range
Reverse leakage current characteristics
Operating temperature range coverage
RoHS compliance status

Substitute parts are grouped into two categories:

Category 1: Direct 1 A Equivalents Parts rated for exactly 1 A average rectified current with 30 V reverse voltage rating and DO-214AA/SMB packaging. These provide pin-for-pin and functional equivalence.

Category 2: Higher Current Rated Substitutes Parts rated for 2 A or 3 A average rectified current with 30 V reverse voltage rating. These provide electrical and mechanical compatibility with enhanced current handling capability, suitable for applications where increased margin is acceptable.

Category 3: Alternative Package Equivalents Parts with identical electrical specifications but different surface mount packages (SOD-128). These require PCB layout modification but maintain electrical performance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Temp Range	RoHS Status	Product Status
SK13-LTP	Micro Commercial Co	30 V	1 A	500 mV @ 1 A	DO-214AA, SMB	-55°C ~ 125°C	ROHS3 Compliant	Not For New Designs
B130B-13-F	Diodes Incorporated	30 V	1 A	500 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant	Active
MBRS130T3G	onsemi	30 V	1 A	600 mV @ 1 A	DO-214AA, SMB	-65°C ~ 125°C	ROHS3 Compliant	Active
5818SMJ/TR13	Microchip Technology	30 V	1 A	550 mV @ 1 A	DO-214AA, SMB	-55°C ~ 150°C	RoHS non-compliant	Active
PMEG3010BEP,115	Nexperia USA Inc.	30 V	1 A	450 mV @ 1 A	SOD-128	-55°C ~ 150°C	ROHS3 Compliant	Active
B130LB-13-F	Diodes Incorporated	30 V	2 A	445 mV @ 2 A	DO-214AA, SMB	-55°C ~ 125°C	ROHS3 Compliant	Active
MBRS130LT3G	onsemi	30 V	2 A	445 mV @ 2 A	DO-214AA, SMB	-65°C ~ 125°C	ROHS3 Compliant	Active
MBRS230LT3G	onsemi	30 V	2 A	500 mV @ 2 A	DO-214AA, SMB	-55°C ~ 125°C	ROHS3 Compliant	Active
B230-13-F	Diodes Incorporated	30 V	2 A	500 mV @ 2 A	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant	Active
B330B-13-F	Diodes Incorporated	30 V	3 A	500 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant	Active
SK33B/TR13	Microsemi Corporation	30 V	3 A	500 mV @ 3 A	DO-214AA, SMB	-55°C ~ 125°C	RoHS non-compliant	Active

Engineering Selection Recommendations

For Direct Replacement (1 A Rated, DO-214AA/SMB Package):

B130B-13-F (Diodes Incorporated) is the primary recommended substitute. It provides identical electrical specifications to the SK13-LTP with forward voltage of 500 mV @ 1 A, matching the original part exactly. The part is ROHS3 compliant, carries Active product status, and offers an extended operating temperature range (-65°C ~ 150°C) compared to the original (-55°C ~ 125°C). This part is suitable for direct PCB substitution without design modification.

PMEG3010BEP,115 (Nexperia USA Inc.) is an alternative 1 A equivalent with superior forward voltage characteristics (450 mV @ 1 A), resulting in lower power dissipation. However, this part uses SOD-128 packaging instead of DO-214AA/SMB, requiring PCB layout modification. ROHS3 compliance and Active product status are confirmed.

For Applications Requiring Higher Current Margin:

B130LB-13-F and MBRS130LT3G are 2 A rated alternatives that maintain 30 V reverse voltage rating and DO-214AA/SMB packaging. Both are ROHS3 compliant and Active. These parts provide increased current handling capacity while maintaining mechanical and electrical compatibility. Forward voltage characteristics are favorable (445 mV @ 2 A), reducing thermal load compared to the original specification.

MBRS230LT3G (onsemi) is a 2 A rated option with forward voltage matching the original specification (500 mV @ 2 A), providing direct electrical behavior equivalence with enhanced current capability.

B330B-13-F (Diodes Incorporated) is a 3 A rated option offering maximum current margin. This part includes AEC-Q101 automotive qualification and is ROHS3 compliant with Active product status. It is suitable for applications where design robustness and supply chain redundancy are priorities.

Compliance Considerations:

All recommended substitutes except 5818SMJ/TR13 and SK33B/TR13 are ROHS3 compliant. If RoHS compliance is a design requirement, these two parts must be excluded from selection.

Product Status:

The SK13-LTP carries "Not For New Designs" status. All substitute parts listed carry "Active" product status, ensuring long-term availability and continued manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can B130B-13-F be used as a direct replacement for SK13-LTP without PCB modification?

A: Yes. B130B-13-F is electrically and mechanically equivalent to SK13-LTP. Both use DO-214AA/SMB packaging, have identical 30 V reverse voltage and 1 A current ratings, and match forward voltage specifications (500 mV @ 1 A). No PCB layout changes are required.

Q: What is the difference between 1 A and 2 A rated substitutes?

A: The current rating indicates the maximum average rectified current the diode can conduct continuously. A 2 A rated diode (such as B130LB-13-F or MBRS130LT3G) can safely conduct up to 2 A, while a 1 A rated diode (such as B130B-13-F) is rated for 1 A maximum. In applications where the SK13-LTP conducts 1 A or less, both 1 A and 2 A rated substitutes are acceptable. The 2 A rated option provides additional design margin and thermal headroom.

Q: Why does PMEG3010BEP,115 have a different package designation?

A: PMEG3010BEP,115 uses SOD-128 packaging instead of DO-214AA/SMB. While the electrical specifications are equivalent (30 V, 1 A, Schottky), the physical package dimensions and PCB footprint differ. This part requires PCB layout modification and cannot be used as a direct drop-in replacement without redesign.

Q: Are there RoHS compliance differences between substitute options?

A: Yes. B130B-13-F, MBRS130T3G, PMEG3010BEP,115, B130LB-13-F, MBRS130LT3G, MBRS230LT3G, B230-13-F, and B330B-13-F are all ROHS3 compliant. However, 5818SMJ/TR13 (Microchip Technology) and SK33B/TR13 (Microsemi Corporation) are RoHS non-compliant. If your application or supply chain requires RoHS compliance, these two parts must be excluded.

Q: What is the significance of forward voltage (Vf) differences between substitutes?

A: Forward voltage determines the voltage drop across the diode during conduction and directly affects power dissipation. Lower forward voltage results in less heat generation. For example, PMEG3010BEP,115 has 450 mV @ 1 A compared to the original 500 mV @ 1 A, resulting in approximately 10% lower power dissipation. In thermal-sensitive applications, lower Vf substitutes may improve circuit efficiency and reduce cooling requirements.

Q: Can I use a 3 A rated diode (B330B-13-F) in place of the 1 A SK13-LTP?

A: Yes. B330B-13-F is electrically and mechanically compatible with SK13-LTP. The higher current rating (3 A versus 1 A) does not create incompatibility; it simply provides additional design margin. The diode will operate safely at 1 A or lower. This substitution is appropriate when supply chain availability or long-term sourcing of the original part is a concern.

Q: What is the operating temperature range difference, and does it matter?

A: The SK13-LTP operates from -55°C to 125°C. Many substitutes, such as B130B-13-F, extend this range to -65°C to 150°C. If your application operates within the original range (-55°C to 125°C), both the original and substitute specifications are acceptable. Extended temperature range substitutes provide additional design margin for applications with extreme environmental conditions.

Q: Is there a performance difference between Microchip Technology 5818SMJ/TR13 and Diodes Incorporated B130B-13-F?

A: Both are 1 A, 30 V Schottky diodes in DO-214AA/SMB packaging. The primary differences are: 5818SMJ/TR13 has 550 mV forward voltage (versus 500 mV for B130B-13-F), is RoHS non-compliant, and has an extended temperature range (-55°C to 150°C). B130B-13-F is ROHS3 compliant with a slightly lower forward voltage. For new designs or RoHS-regulated applications, B130B-13-F is the preferred choice.

Q: Why is B330B-13-F qualified to AEC-Q101 automotive standard?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. B330B-13-F meets this qualification, indicating it has undergone rigorous testing for reliability, temperature cycling, and performance consistency required in automotive applications. This qualification is relevant only if your application requires automotive-grade components. For non-automotive applications, this qualification does not affect functionality or compatibility.

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