LL5817 L0G Equivalent & Substitute Parts

Part Overview

The LL5817 L0G is a Schottky rectifier diode rated for 20 V DC reverse voltage and 1 A average rectified current, manufactured by Taiwan Semiconductor Corporation in a surface mount MELF (DO-213AB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Equivalent and substitute parts are necessary to support existing applications, legacy system maintenance, and production continuity where this diode is specified in active designs.

Key Parameters

Parameter	Value
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 3 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V
Capacitance @ Vr, F	110 pF @ 4 V, 1 MHz
Package / Case	DO-213AB, MELF
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LL5817 L0G is determined by strict electrical and mechanical parameter matching across the following criteria:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 20 V
Current - Average Rectified (Io): 1 A
Technology: Schottky
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 20 V
Capacitance @ Vr, F: 110 pF @ 4 V, 1 MHz

Mechanical Parameters (Must Match):

Package / Case: DO-213AB, MELF
Mounting Type: Surface Mount

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed below meet these criteria. Variations in forward voltage (Vf) at different current levels and operating temperature ranges do not disqualify substitution when the primary electrical ratings and package specifications are identical.

Parameter Comparison

Parameter	LL5817 L0G (Main)	BYM13-20-E3/96	BYM13-20-E3/97	BYM13-20HE3/96	BYM13-20HE3/97	SGL41-20-E3/96	SGL41-20-E3/97	SGL41-20HE3/96	SGL41-20HE3/97
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 3 A	500 mV @ 1 A	500 mV @ 1 A	500 mV @ 1 A	500 mV @ 1 A	500 mV @ 1 A	500 mV @ 1 A	500 mV @ 1 A	500 mV @ 1 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V
Capacitance @ Vr, F	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz	110 pF @ 4 V, 1 MHz
Package / Case	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed are electrically and mechanically equivalent to the LL5817 L0G and meet the same compliance requirements (ROHS3 Compliant, MSL 1, REACH Unaffected). The primary distinction between substitute options is product status and availability.

Active Product Status: All Vishay substitute parts (BYM13 and SGL41 series) carry Active product status, indicating ongoing manufacturing support and availability. This contrasts with the LL5817 L0G, which is designated "Not For New Designs" and represents obsolete inventory.

Packaging Variants: Substitute parts are available in two packaging configurations:

Tape & Reel (TR): BYM13-20-E3/96, BYM13-20-E3/97, SGL41-20-E3/96, SGL41-20-E3/97
Unspecified packaging: BYM13-20HE3/96, BYM13-20HE3/97, SGL41-20HE3/96, SGL41-20HE3/97

Operating Temperature Range: The LL5817 L0G operates from -65°C to 125°C junction temperature. All Vishay substitutes operate from -55°C to 125°C. Applications requiring operation below -55°C junction temperature cannot use these substitutes.

Forward Voltage Characteristics: Substitute parts exhibit lower forward voltage (500 mV @ 1 A) compared to the main part (750 mV @ 3 A). This represents an improvement in efficiency and reduced power dissipation in typical operating conditions.

Frequently Asked Questions (FAQ)

Q: Can BYM13-20-E3/96 directly replace LL5817 L0G in existing designs?

A: Yes. Both parts share identical electrical ratings (20 V, 1 A, Schottky technology, fast recovery ≤ 500 ns), reverse leakage current (500 µA @ 20 V), capacitance (110 pF @ 4 V, 1 MHz), and package specification (DO-213AB, MELF surface mount). Both are ROHS3 compliant with MSL 1. The primary difference is product status: LL5817 L0G is not for new designs, while BYM13-20-E3/96 is active.

Q: What is the difference between BYM13-20-E3/96 and BYM13-20-E3/97?

A: Both parts are electrically identical and carry the same electrical specifications. The suffix designations (/96 and /97) indicate different manufacturing date codes or tape reel configurations. Selection between these variants depends on procurement requirements and availability.

Q: Are SGL41 parts equivalent to BYM13 parts?

A: Yes. SGL41-20-E3/96, SGL41-20-E3/97, SGL41-20HE3/96, and SGL41-20HE3/97 are electrically and mechanically equivalent to their BYM13 counterparts. All share identical electrical ratings, package specifications, and compliance certifications. Selection between BYM13 and SGL41 series depends on supplier availability and procurement preference.

Q: Does the lower forward voltage of substitute parts affect circuit performance?

A: Substitute parts exhibit 500 mV forward voltage @ 1 A compared to the main part's 750 mV @ 3 A. These measurements are taken at different current levels and therefore are not directly comparable. The electrical specifications provided for each part define its performance envelope. Circuit performance depends on the specific operating current and voltage conditions of the application.

Q: Can these parts be used in applications requiring operation below -55°C?

A: No. All Vishay substitute parts are rated for -55°C to 125°C junction temperature operation. The LL5817 L0G extends to -65°C. Applications requiring operation below -55°C junction temperature require alternative components rated for lower temperatures.

Q: What is the significance of the packaging designation (TR vs. unspecified)?

A: Tape & Reel (TR) packaging indicates the component is supplied on continuous tape for automated assembly equipment. Parts with unspecified packaging may be supplied in alternative formats. Selection depends on manufacturing process requirements and equipment compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant status, matching the compliance level of the LL5817 L0G. All parts are also REACH Unaffected and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute part should be selected for new procurement?

A: Selection should prioritize parts with Active product status and Tape & Reel packaging for manufacturing continuity. BYM13-20-E3/96, BYM13-20-E3/97, SGL41-20-E3/96, and SGL41-20-E3/97 meet these criteria. Specific selection between BYM13 and SGL41 series, and between /96 and /97 variants, depends on supplier availability and internal procurement specifications.

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