SD101C-T Schottky Diode Equivalent & Substitute Parts

Part Overview

The SD101C-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 15 mA average rectified current in a through-hole DO-35 package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and production continuity. The SD101C-T serves applications requiring low-voltage Schottky rectification with minimal forward voltage drop and fast switching characteristics inherent to Schottky technology.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	15	mA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 mA	mV
Reverse Recovery Time (trr)	1	ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	nA
Capacitance @ Vr, F	2.2 pF @ 0V, 1MHz	pF
Mounting Type	Through Hole	-
Package / Case	DO-35	-
Operating Temperature - Junction	-65 to 175	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SD101C-T is determined by alignment of the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 15 mA
Technology: Schottky rectifier diode
Mounting Type: Through Hole (for direct mechanical compatibility)
Package / Case: DO-35 or equivalent axial through-hole package

Secondary Compatibility Factors:

Forward voltage characteristics at rated current
Reverse recovery time and leakage current
Operating temperature range
RoHS and regulatory compliance status

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with active product status) and Functional Alternatives (meeting electrical requirements with package or current rating variations).

Parameter Comparison

Parameter	SD101C-T (Main)	SD101CW-7-F	1N5825	1N6263	1N6677-1	BAT42	DSB0.5A40
Manufacturer	Diodes Inc.	Diodes Inc.	Microchip	STMicroelectronics	Microchip	STMicroelectronics	Microchip
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	60 V	40 V	30 V	40 V
Current - Average Rectified (Io)	15 mA	15 mA	5 A	15 mA	200 mA	200 mA	500 mA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 mA	900 mV @ 15 mA	380 mV @ 5 A	1 V @ 15 mA	500 mV @ 200 mA	1 V @ 200 mA	650 mV @ 500 mA
Reverse Recovery Time (trr)	1 ns	1 ns	-	-	-	5 ns	-
Current - Reverse Leakage @ Vr	200 nA @ 30 V	200 nA @ 30 V	10 mA @ 40 V	200 nA @ 50 V	5 µA @ 40 V	500 nA @ 25 V	10 µA @ 40 V
Capacitance @ Vr, F	2.2 pF @ 0V, 1MHz	2.2 pF @ 0V, 1MHz	-	2.2 pF @ 0V, 1MHz	50 pF @ 0V, 1MHz	7 pF @ 1V, 1MHz	60 pF @ 0V, 1MHz
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-35	SOD-123	TOP HAT	DO-35	DO-35	DO-35	DO-35
Operating Temperature - Junction	-65 to 175°C	-65 to 125°C	-	-65 to 200°C	-65 to 125°C	-65 to 125°C	-65 to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

The SD101CW-7-F (Diodes Incorporated) is the direct functional equivalent of the SD101C-T, matching all electrical specifications including 40 V reverse voltage, 15 mA current rating, 900 mV forward voltage, and 1 ns reverse recovery time. This part is active in production with ROHS3 compliance. The primary difference is mounting technology: SD101CW-7-F is surface mount (SOD-123 package) rather than through-hole, requiring PCB layout modification. Operating temperature range is reduced to -65 to 125°C compared to the SD101C-T's -65 to 175°C maximum.

Through-Hole Alternatives (Same Package Family):

The 1N6263 (STMicroelectronics) maintains through-hole DO-35 packaging and 15 mA current rating with identical capacitance characteristics. It provides higher voltage rating (60 V vs. 40 V) and extended operating temperature range (-65 to 200°C). Forward voltage is slightly elevated at 1 V versus 900 mV. This part is active and ROHS3 compliant.

The 1N6677-1 (Microchip Technology) offers through-hole DO-35 packaging with increased current capacity (200 mA vs. 15 mA) and lower forward voltage (500 mV @ 200 mA). Reverse leakage is higher at 5 µA, and RoHS compliance is non-compliant. This part is suitable for applications requiring higher current handling within the same voltage class.

Higher Current Capacity Alternative:

The DSB0.5A40 (Microchip Technology) provides through-hole DO-35 packaging with 40 V rating and significantly increased current capacity (500 mA). Forward voltage is 650 mV at 500 mA. This part is active but RoHS non-compliant and exhibits higher reverse leakage (10 µA).

Not Recommended:

The BAT42 (STMicroelectronics) has reduced voltage rating (30 V vs. 40 V), making it unsuitable for applications requiring full 40 V reverse voltage margin.

The 1N5825 (Microchip Technology) is rated for 5 A current, significantly exceeding the 15 mA requirement, and uses a different package form (TOP HAT), making it impractical for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the SD101CW-7-F replace the SD101C-T in existing through-hole designs?

A: The SD101CW-7-F is electrically equivalent but requires PCB redesign. It is a surface-mount component (SOD-123 package) whereas the SD101C-T is through-hole (DO-35). Direct socket substitution is not possible without board modification.

Q: What is the primary difference between the 1N6263 and the SD101C-T?

A: The 1N6263 maintains through-hole DO-35 packaging and 15 mA current rating. It provides higher reverse voltage rating (60 V vs. 40 V) and extended operating temperature range (-65 to 200°C vs. -65 to 175°C). Forward voltage is 1 V compared to 900 mV. Both are ROHS3 compliant and active products.

Q: Can I use the 1N6677-1 as a direct replacement?

A: The 1N6677-1 is mechanically compatible (through-hole DO-35 package) and electrically suitable for 40 V applications. However, it has higher current capacity (200 mA vs. 15 mA), higher reverse leakage (5 µA vs. 200 nA), and is RoHS non-compliant. It is appropriate for designs where higher current margin is beneficial and RoHS compliance is not required.

Q: Why is the BAT42 not recommended as a substitute?

A: The BAT42 has a maximum reverse voltage rating of 30 V, which is below the SD101C-T's 40 V specification. Using this part in a 40 V application creates risk of reverse voltage overstress and diode failure.

Q: What are the compliance implications of selecting 1N6677-1 or DSB0.5A40?

A: Both parts are RoHS non-compliant, whereas the SD101C-T is ROHS3 compliant. Selection of these parts requires verification that the end application and regulatory jurisdiction permit non-compliant components. REACH status is unaffected for all substitute options.

Q: How does operating temperature range affect part selection?

A: The SD101C-T operates to 175°C junction temperature. The 1N6263 extends this to 200°C, providing additional thermal margin. Most other substitutes are limited to 125°C. Selection depends on the thermal environment of the application. Higher temperature capability does not degrade performance in lower-temperature applications.

Q: Are there inventory considerations for these substitutes?

A: The SD101CW-7-F has the highest inventory availability (17,790 pcs), followed by BAT42 (45,200 pcs). The SD101C-T itself has 684 pcs in stock but is obsolete. Other substitutes have lower inventory levels (857 to 3,308 pcs). Availability should be verified with the supplier for production quantities.

Q: What is the significance of reverse recovery time in these diodes?

A: The SD101C-T and SD101CW-7-F both have 1 ns reverse recovery time, indicating very fast switching. The BAT42 has 5 ns. Higher reverse recovery time increases switching losses in high-frequency applications. For low-frequency rectification, this parameter is less critical.

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