LL4001G L0 Equivalent & Substitute Parts

Part Overview

The LL4001G L0 is a general-purpose rectifier diode rated for 50 V reverse voltage and 1 A average rectified current in a surface mount MELF package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LL4001G L0 are selected based on strict electrical and mechanical compatibility. The following parameters define substitution eligibility:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V (exact match required)
Current - Average Rectified (Io): 1 A (exact match required)
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A (exact match required)
Speed: Standard Recovery >500ns, > 200mA (Io) (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: DO-213AB, MELF (exact match required)

Secondary Compatibility Criteria:

Operating Temperature - Junction: -65°C minimum and 150°C minimum (substitute must meet or exceed)
RoHS Status: ROHS3 Compliant (compliance maintained)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (compatibility maintained)

Substitute parts are grouped into two categories based on technology type: Standard Recovery diodes and Avalanche diodes. Both categories meet the primary electrical specifications. Standard Recovery substitutes include 1N6478 series and BYM11 series parts. Avalanche technology substitutes include BYM10 series parts, which provide enhanced reverse voltage protection characteristics while maintaining identical forward voltage and current ratings.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Reverse Leakage @ Vr	Capacitance @ Vr, F	Tj (Operating)	Product Status
LL4001G L0	Taiwan Semiconductor Corporation	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	5 µA @ 50 V	15 pF @ 4V, 1MHz	-65 to 150°C	Obsolete
1N6478-E3/96	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
1N6478-E3/97	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
1N6478HE3/96	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
1N6478HE3/97	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
BYM10-50-E3/96	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
BYM10-50-E3/97	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
BYM10-50HE3/96	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
BYM10-50HE3/97	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns, > 200mA	10 µA @ 50 V	8 pF @ 4V, 1MHz	-65 to 175°C	Active
BYM11-50-E3/96	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.3 V @ 1 A	Fast Recovery =< 500ns, > 200mA	5 µA @ 50 V	15 pF @ 4V, 1MHz	-65 to 175°C	Active
BYM11-50-E3/97	Vishay General Semiconductor - Diodes Division	50 V	1 A	1.3 V @ 1 A	Fast Recovery =< 500ns, > 200mA	5 µA @ 50 V	15 pF @ 4V, 1MHz	-65 to 175°C	Active

Engineering Selection Recommendations

All substitute parts listed are manufactured by Vishay General Semiconductor - Diodes Division and carry Active product status, ensuring long-term availability and supply chain stability. All substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original LL4001G L0.

1N6478 Series (Standard Recovery, SUPERECTIFIER®): The 1N6478-E3/96, 1N6478-E3/97, 1N6478HE3/96, and 1N6478HE3/97 variants provide direct electrical equivalence to the LL4001G L0 with identical forward voltage and recovery speed characteristics. These parts feature extended operating temperature range (-65°C to 175°C) and are available in multiple packaging formats (Tape & Reel). The 1N6478 series is recommended for applications requiring standard recovery performance with proven SUPERECTIFIER® technology.

BYM10 Series (Avalanche Technology, SUPERECTIFIER®): The BYM10-50-E3/96, BYM10-50-E3/97, BYM10-50HE3/96, and BYM10-50HE3/97 variants employ Avalanche technology while maintaining identical electrical specifications for voltage, current, and forward voltage. These parts are suitable for applications requiring enhanced reverse voltage protection. The BYM10 series is available in Cut Tape and Tape & Reel packaging formats.

BYM11 Series (Fast Recovery, SUPERECTIFIER®): The BYM11-50-E3/96 and BYM11-50-E3/97 variants feature fast recovery characteristics (≤500 ns) with 150 ns reverse recovery time. Forward voltage is specified at 1.3 V @ 1 A, representing a 0.2 V increase over the LL4001G L0. These parts are suitable for applications where faster switching performance is required and the higher forward voltage drop is acceptable. The BYM11 series maintains identical reverse leakage and capacitance characteristics to the original part.

All substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes.

Frequently Asked Questions (FAQ)

Q: Can the 1N6478 series directly replace the LL4001G L0?

A: Yes. The 1N6478-E3/96, 1N6478-E3/97, 1N6478HE3/96, and 1N6478HE3/97 provide direct electrical equivalence. All critical parameters match: 50 V reverse voltage, 1 A average rectified current, 1.1 V forward voltage @ 1 A, and standard recovery speed. Operating temperature range extends from -65°C to 175°C, exceeding the original -65°C to 150°C specification.

Q: What is the difference between the BYM10 and 1N6478 series?

A: Both series maintain identical electrical specifications for voltage, current, and forward voltage. The primary difference is technology: BYM10 employs Avalanche technology for enhanced reverse voltage protection, while 1N6478 uses standard rectifier technology. Both are SUPERECTIFIER® products from Vishay. Selection depends on application requirements for reverse voltage transient protection.

Q: Why do the BYM11 parts show 1.3 V forward voltage instead of 1.1 V?

A: The BYM11 series features fast recovery characteristics (≤500 ns with 150 ns reverse recovery time) compared to the standard recovery (>500 ns) of the LL4001G L0. The higher forward voltage is a characteristic of fast recovery diode technology. BYM11 substitution is appropriate only when faster switching performance is required and the 0.2 V forward voltage increase is acceptable to the circuit design.

Q: Are there packaging differences between substitute parts?

A: Yes. The 1N6478-E3/96 and 1N6478-E3/97 are supplied in Tape & Reel format. The BYM10-50-E3/96 is supplied in Cut Tape & Digi-Reel®, while BYM10-50-E3/97 is supplied in Tape & Reel. The 1N6478HE3/96, 1N6478HE3/97, BYM10-50HE3/96, and BYM10-50HE3/97 variants have unspecified packaging designations. All parts use the DO-213AB MELF (Glass) package case, maintaining mechanical compatibility with the original LL4001G L0 MELF package.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are ROHS3 compliant with REACH unaffected status, matching the regulatory compliance of the original LL4001G L0. Moisture sensitivity level is MSL 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Q: Which substitute should I select for new designs?

A: For new designs, select from the Active status parts: 1N6478 series or BYM10 series. Both provide long-term availability and supply chain stability. Choose 1N6478 for standard recovery applications or BYM10 for applications requiring avalanche protection. Avoid BYM11 unless fast recovery switching performance is a specific design requirement and the higher forward voltage is acceptable.

Q: What is the inventory status of substitute parts?

A: The 1N6478-E3/96 has 22,469 units in stock. The 1N6478-E3/97 has 950 units. The 1N6478HE3/96 has 1,087 units. The 1N6478HE3/97 has 780 units. The BYM10-50-E3/96 has 17,311 units. The BYM10-50-E3/97 has 20,100 units. The BYM10-50HE3/96 has 1,088 units. The BYM10-50HE3/97 has 1,117 units. The BYM11-50-E3/96 has 926 units. The BYM11-50-E3/97 has 721 units. Inventory levels support both prototype and production volume requirements.

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