SS14E-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS14E-TP is a 40V, 1A Schottky rectifier diode manufactured by Micro Commercial Co in a surface mount SMAE package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing production and design requirements. The SS14E-TP serves as a fast recovery rectifier suitable for low-voltage power supply applications, voltage clamping, and reverse polarity protection circuits. Due to its obsolete status, active alternatives with matching or superior electrical characteristics are required for new procurement and design continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	600 mV @ 1 A	mV
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	110	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS14E-TP is determined by equivalence in the following critical parameters: reverse voltage rating (40V), average rectified current (1A nominal), Schottky technology, surface mount configuration, and fast recovery speed characteristic (≤ 500ns). Package compatibility is secondary; parts in DO-214AC (SMA) or functionally equivalent packages are acceptable. Forward voltage drop (Vf) variations within 100 mV are acceptable for most applications. Reverse leakage current tolerance extends to 1 mA at rated voltage. Operating temperature range may vary; parts rated to -55°C minimum and 125°C or higher maximum are suitable. All substitute parts must maintain ROHS3 compliance and MSL 1 rating.

Substitute parts are grouped into two categories:

Direct Equivalents (Recommended): Parts with identical or superior electrical specifications, active product status, and standard SMA packaging.

Functional Alternatives: Parts with higher current ratings (2A or 3A), alternative package formats (Mini SMA/SOD-123, PMDS), or not-for-new-designs status that remain electrically compatible within application constraints.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV	Package / Case	Product Status	Tj (°C)	RoHS
SS14E-TP	Micro Commercial Co	40	1	600 @ 1A	DO-214AC, SMA	Obsolete	-55 to 150	ROHS3
SS14FL-TP	Micro Commercial Co	40	1	500 @ 1A	DO-221AC, SMA Flat Leads	Active	-55 to 150	ROHS3
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	DO-214AC, SMA	Active	-65 to 150	ROHS3
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AC, SMA	Active	-65 to 150	ROHS3
CDBA140-G	Comchip Technology	40	1	500 @ 1A	DO-214AC, SMA	Active	-65 to 125	ROHS3
CDBA140SL-HF	Comchip Technology	40	1.4	330 @ 1A	DO-214AC, SMA	Active	-50 to 100	ROHS3
CDBM140-G	Comchip Technology	40	1	500 @ 1A	SOD-123T, Mini SMA	Active	-50 to 125	ROHS3
MBRA140T3G	onsemi	40	1	550 @ 1A	DO-214AC, SMA	Active	-55 to 125	ROHS3
RB056L-40TE25	Rohm Semiconductor	40	3	670 @ 3A	DO-214AC, SMA (PMDS)	Not For New Designs	150 (Max)	ROHS3
RB160L-40TE25	Rohm Semiconductor	40	1	550 @ 1A	DO-214AC, SMA (PMDS)	Not For New Designs	150 (Max)	ROHS3
RB162L-40TE25	Rohm Semiconductor	40	1	550 @ 1A	DO-214AC, SMA (PMDS)	Not For New Designs	150 (Max)	ROHS3

Engineering Selection Recommendations

Primary Recommendation: SS14FL-TP (Micro Commercial Co) is the manufacturer-recommended direct replacement. This part maintains identical reverse voltage and current ratings, operates across the same temperature range, and is in active production status. The DO-221AC package with flat leads is mechanically compatible with standard SMA footprints. Forward voltage is improved at 500 mV versus the original 600 mV specification.

Secondary Recommendations (Active Status):

B140-13-F (Diodes Incorporated) provides equivalent electrical performance with extended lower temperature rating (-65°C minimum). Standard DO-214AC SMA packaging ensures direct footprint compatibility. High inventory availability supports supply chain continuity.

CDBA140-G (Comchip Technology) offers identical 1A current rating and 40V reverse voltage in standard SMA packaging. Active production status and ROHS3 compliance support long-term availability.

MBRA140T3G (onsemi) delivers equivalent specifications with forward voltage of 550 mV. Active status and established supply chain support procurement reliability.

Alternative Consideration (Higher Current Rating):

B240A-13-F (Diodes Incorporated) provides 2A average rectified current while maintaining 40V reverse voltage rating. This part is suitable for applications requiring current margin or future design scaling. Identical package and active status ensure compatibility.

Not Recommended for New Designs:

RB056L-40TE25, RB160L-40TE25, and RB162L-40TE25 (Rohm Semiconductor) carry "Not For New Designs" status. These parts are available in inventory but should not be selected for new product development or long-term production commitments.

Package Consideration:

CDBM140-G (Comchip Technology) uses SOD-123T (Mini SMA) package, which requires PCB footprint modification. This part is suitable only when space constraints necessitate smaller package geometry.

Temperature Range Consideration:

CDBA140SL-HF (Comchip Technology) operates within -50°C to 100°C range, which is narrower than the original -55°C to 150°C specification. This part is suitable only for applications operating within this restricted temperature window.

Frequently Asked Questions (FAQ)

Q: Can SS14FL-TP directly replace SS14E-TP without PCB modification?

A: Yes. Both parts use DO-214AC/SMA package geometry. The SS14FL-TP features flat leads (SMA-FL variant) which are mechanically compatible with standard SMA footprints. No PCB redesign is required.

Q: What is the significance of the forward voltage difference between SS14E-TP (600 mV) and substitute parts (500 mV)?

A: Lower forward voltage in substitute parts (SS14FL-TP, B140-13-F, CDBA140-G) indicates improved efficiency and reduced power dissipation. This is a beneficial characteristic that does not compromise compatibility. Applications designed for 600 mV forward drop operate safely with lower voltage alternatives.

Q: Is B240A-13-F (2A rating) suitable as a direct replacement for 1A applications?

A: Yes. The B240A-13-F maintains 40V reverse voltage rating and is rated for 2A average rectified current. In 1A applications, this part operates well within its current rating, providing additional design margin. Package and electrical characteristics are otherwise equivalent.

Q: Why are Rohm Semiconductor parts marked "Not For New Designs"?

A: Parts designated "Not For New Designs" indicate manufacturer end-of-life or transition status. These components remain available in inventory but manufacturers do not recommend their selection for new product development. Existing designs using these parts may continue procurement, but new designs should select from active-status alternatives.

Q: Can CDBM140-G (Mini SMA/SOD-123T) be used in place of standard SMA packages?

A: CDBM140-G uses SOD-123T package, which has different physical dimensions than DO-214AC SMA. Direct PCB footprint substitution is not possible without layout modification. This part is suitable only when space constraints require smaller package geometry and PCB redesign is feasible.

Q: What is the impact of CDBA140SL-HF's narrower operating temperature range (-50°C to 100°C)?

A: CDBA140SL-HF is restricted to -50°C to 100°C operation, compared to the original -55°C to 150°C range. This part is compatible only with applications operating within this narrower window. Applications requiring full -55°C to 150°C range must select alternatives such as SS14FL-TP, B140-13-F, or MBRA140T3G.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original SS14E-TP specification. All parts also maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the difference between CDBA140-G and CDBA140SL-HF?

A: Both parts are Comchip Technology Schottky diodes with 40V/1A ratings in DO-214AC SMA package. CDBA140SL-HF provides higher current rating (1.4A) and lower forward voltage (330 mV @ 1A) but operates within narrower temperature range (-50°C to 100°C). CDBA140-G operates across -65°C to 125°C range. Selection depends on application temperature requirements.

Q: Which substitute offers the best forward voltage performance?

A: CDBA140SL-HF provides the lowest forward voltage at 330 mV @ 1A, resulting in lowest power dissipation. However, this part's restricted temperature range (-50°C to 100°C) limits its applicability. For applications requiring both low forward voltage and full temperature range, SS14FL-TP, B140-13-F, and CDBA140-G all provide 500 mV forward voltage with appropriate temperature ratings.

Q: Is extended temperature rating (-65°C minimum) beneficial?

A: B140-13-F offers -65°C minimum rating versus the original -55°C specification. This extended lower temperature capability provides additional design margin for applications operating in cold environments. The benefit is marginal for most commercial applications but valuable for industrial or aerospace applications.

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