SD103CW-HE3-18 Equivalent & Substitute Parts

Part Overview

The SD103CW-HE3-18 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20 V DC reverse voltage and 350 mA average rectified current in a surface mount SOD-123 package. This component is classified as Last Time Buy, indicating discontinued production with limited availability. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications utilizing this diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	350	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	mV @ mA
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	5	µA @ 10 V
Capacitance @ Vr, F	50	pF @ 0V, 1MHz
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SD103CW-HE3-18 are classified into two categories based on electrical and mechanical compatibility:

Category 1: Parametric Equivalents (Same Current Rating - 350 mA)

Parametric equivalent parts maintain identical or equivalent electrical specifications including 20 V reverse voltage rating, 350 mA average rectified current, 10 ns reverse recovery time, and SOD-123 surface mount packaging. These parts are direct functional replacements with no circuit redesign required. Parts in this category include SD103CW-HE3_A-18, SD103CW-E3-18, and SD103CW-G3-18 from Vishay, and SD103CW-HE3-08 (Last Time Buy variant).

Category 2: Higher Current Rated Substitutes (500 mA Rating)

Higher current rated substitutes maintain the 20 V reverse voltage rating and SOD-123 package but are rated for 500 mA average rectified current. These parts provide enhanced current handling capability and are electrically compatible with circuits designed for the 350 mA SD103CW-HE3-18. Forward voltage characteristics vary by manufacturer. Parts in this category include B0520LW-7-F, B0520LWQ-7-F, CDBW0520L-G, MBR0520-TP, MBR0520L-TP, and MBR0520LT1G.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): 20 V (required)
Package / Case: SOD-123 (required)
Mounting Type: Surface Mount (required)
Technology: Schottky (required)
Current - Average Rectified (Io): 350 mA minimum (350 mA equivalent or 500 mA higher-rated)
Reverse Recovery Time (trr): ≤ 500 ns (required)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV @ mA]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Grade	AEC-Q101
SD103CW-HE3-18	Vishay	20	350	600 @ 200	10	5 @ 10V	SOD-123	Last Time Buy	Automotive	Yes
SD103CW-HE3_A-18	Vishay	20	350	600 @ 200	10	5 @ 10V	SOD-123	Active	Automotive	Yes
SD103CW-E3-18	Vishay	20	350	600 @ 200	10	5 @ 10V	SOD-123	Active	—	—
SD103CW-G3-18	Vishay	20	350	600 @ 200	10	5 @ 10V	SOD-123	Active	—	—
SD103CW-HE3-08	Vishay	20	350	600 @ 200	10	5 @ 10V	SOD-123	Last Time Buy	Automotive	Yes
B0520LW-7-F	Diodes Incorporated	20	500	385 @ 500	10	250 @ 20V	SOD-123	Active	—	—
B0520LWQ-7-F	Diodes Incorporated	20	500	385 @ 500	10	250 @ 20V	SOD-123	Active	Automotive	Yes
CDBW0520L-G	Comchip Technology	20	500	385 @ 500	10	250 @ 20V	SOD-123	Active	—	—
MBR0520-TP	Micro Commercial Co	20	500	450 @ 500	10	200 @ 20V	SOD-123	Active	—	—
MBR0520L-TP	Micro Commercial Co	20	500	385 @ 500	10	250 @ 20V	SOD-123	Active	—	—
MBR0520LT1G	onsemi	20	500	385 @ 500	10	250 @ 20V	SOD-123	Active	—	—

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

SD103CW-HE3_A-18 is the manufacturer-recommended direct replacement, maintaining identical electrical specifications and automotive-grade qualification with AEC-Q101 certification. This part is in Active product status with 672 units in stock. SD103CW-E3-18 and SD103CW-G3-18 provide parametric equivalence with higher inventory availability (10,965 and 764 units respectively) and Active product status, suitable for applications where automotive qualification is not mandatory.

For Higher Current Applications:

B0520LWQ-7-F (Diodes Incorporated) is recommended for designs requiring enhanced current capacity with automotive-grade qualification and AEC-Q101 certification, offering 124,640 units in stock. MBR0520L-TP (Micro Commercial Co) provides equivalent electrical performance with 102,150 units available and Active product status. MBR0520LT1G (onsemi) offers the highest inventory availability at 977,400 units with Active product status.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status consistent with the original SD103CW-HE3-18. Automotive applications requiring AEC-Q101 qualification should prioritize B0520LWQ-7-F or maintain Vishay SD103CW-HE3_A-18 selection.

Frequently Asked Questions (FAQ)

Q: Can SD103CW-HE3_A-18 be used as a direct replacement for SD103CW-HE3-18?

A: Yes. SD103CW-HE3_A-18 is the manufacturer-recommended equivalent with identical electrical specifications (20 V, 350 mA, 600 mV @ 200 mA forward voltage, 10 ns reverse recovery time), automotive-grade qualification, AEC-Q101 certification, and SOD-123 surface mount packaging. No circuit modifications are required.

Q: What is the difference between 350 mA and 500 mA rated substitutes?

A: The 500 mA rated parts (B0520LW-7-F, B0520LWQ-7-F, CDBW0520L-G, MBR0520-TP, MBR0520L-TP, MBR0520LT1G) provide higher current handling capability while maintaining the same 20 V reverse voltage rating and SOD-123 package. These are electrically compatible with circuits designed for 350 mA operation and provide design margin for current transients. Forward voltage characteristics vary by manufacturer (385 mV to 450 mV @ 500 mA).

Q: Are all substitute parts automotive-qualified?

A: No. Only SD103CW-HE3_A-18, SD103CW-HE3-08, B0520LWQ-7-F, and the original SD103CW-HE3-18 carry automotive-grade designation with AEC-Q101 qualification. Other substitutes are suitable for industrial and commercial applications but lack automotive certification.

Q: Can I use a 500 mA rated part in a circuit designed for 350 mA?

A: Yes. Higher current-rated parts are electrically compatible with circuits designed for lower current ratings. The 500 mA parts will operate safely at 350 mA or lower current levels. However, verify forward voltage characteristics (385 mV to 450 mV @ 500 mA) against circuit requirements, as these differ from the original 600 mV @ 200 mA specification.

Q: What is the difference between packaging designations (CT, TR, TP)?

A: CT (Cut Tape) & Digi-Reel® and TR (Tape & Reel) are standard surface mount packaging formats for automated assembly. TP designates tape packaging. All substitute parts use SOD-123 surface mount package and are compatible with standard pick-and-place equipment. Verify packaging format against your procurement and assembly requirements.

Q: Why is SD103CW-HE3-18 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production. Existing inventory is available for purchase, but no future production is planned. Transitioning to an Active product status equivalent (SD103CW-HE3_A-18, SD103CW-E3-18, or SD103CW-G3-18) ensures long-term supply chain continuity.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, consistent with environmental and regulatory requirements.

Q: What is the operating temperature range for substitute parts?

A: Vishay parts (SD103CW-HE3-18, SD103CW-HE3_A-18, SD103CW-E3-18, SD103CW-G3-18, SD103CW-HE3-08) operate from -55°C to 125°C. Diodes Incorporated and onsemi 500 mA parts (B0520LW-7-F, B0520LWQ-7-F, MBR0520LT1G) operate from -65°C to 125°C. Comchip CDBW0520L-G operates to 125°C maximum. Verify operating temperature requirements against your application specifications.

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