LL4004G L0 Equivalent & Substitute Parts

Part Overview

The LL4004G L0 is a general-purpose rectifier diode rated for 400 V DC 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. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must match the electrical specifications and mechanical compatibility requirements of the original component.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Capacitance @ Vr, F	15pF @ 4V, 1MHz
Mounting Type	Surface Mount
Package / Case	DO-213AB, MELF
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LL4004G L0 are selected based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Mounting Type: Surface Mount
Package / Case: DO-213AB, MELF or MELF (Glass)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Acceptable Variations:

Forward voltage (Vf) up to 1.3 V @ 1 A is acceptable for standard recovery diodes
Operating temperature range may extend to 175°C without affecting substitution validity
Recovery speed classification may differ (Standard Recovery >500ns or Fast Recovery ≤500ns) based on application requirements
Reverse leakage current up to 10 µA @ 400 V is acceptable
Capacitance variations within the specified measurement conditions are acceptable

All substitute parts listed are manufactured by Vishay General Semiconductor - Diodes Division and carry active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Parameter Comparison

Parameter	LL4004G L0	1N6481-E3/96	1N6481-E3/97	1N6481HE3/96	1N6481HE3/97	BYM10-400-E3/96	BYM10-400-E3/97	BYM10-400/1	BYM10-400HE3/96	BYM10-400HE3/97	BYM11-400-E3/96
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.3 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	5 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	10 µA @ 400 V	5 µA @ 400 V
Capacitance @ Vr, F	15pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	8pF @ 4V, 1MHz	15pF @ 4V, 1MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	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)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are manufactured by Vishay General Semiconductor - Diodes Division and carry active product status, ensuring long-term availability and supply chain continuity. Each substitute part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), meeting environmental and handling requirements equivalent to the original LL4004G L0.

Primary Substitutes (Closest Electrical Match):

The BYM11-400-E3/96 provides the closest electrical match to the LL4004G L0, maintaining identical forward voltage (1.1 V @ 1 A), reverse leakage current (5 µA @ 400 V), and capacitance (15pF @ 4V, 1MHz) specifications. This part features fast recovery characteristics matching the original component and is available in active production status with 12,400 pieces in stock.

Secondary Substitutes (Standard Recovery Diodes):

The 1N6481 series (1N6481-E3/96, 1N6481-E3/97, 1N6481HE3/96, 1N6481HE3/97) and BYM10 series (BYM10-400-E3/96, BYM10-400-E3/97, BYM10-400/1, BYM10-400HE3/96, BYM10-400HE3/97) provide functional equivalence with standard recovery characteristics. These parts maintain the critical voltage and current ratings while accepting higher reverse leakage current (10 µA @ 400 V) and lower capacitance (8pF @ 4V, 1MHz). Standard recovery diodes are suitable for applications where switching speed is not a critical design parameter.

All substitute parts support extended operating temperature ranges to 175°C, providing thermal margin beyond the original component specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute a standard recovery diode for the fast recovery LL4004G L0?

A: Standard recovery diodes (1N6481 series, BYM10 series) have recovery times exceeding 500 ns compared to the LL4004G L0 fast recovery specification of ≤500 ns. Substitution is valid only if the application circuit does not depend on fast switching characteristics. For applications requiring fast recovery performance, use BYM11-400-E3/96.

Q: What is the difference between the 1N6481 and BYM10 series?

A: Both series meet the 400 V, 1 A electrical requirements. The 1N6481 series uses standard technology, while the BYM10 series uses avalanche technology. Both are electrically compatible with the LL4004G L0 for the specified voltage and current ratings. Selection between series depends on packaging availability and supply chain requirements.

Q: Are all substitute parts available in the same package?

A: All substitute parts use the DO-213AB MELF (Glass) package, which is mechanically and electrically compatible with the original DO-213AB MELF package. Physical dimensions and lead configurations are identical, allowing direct board-level substitution without layout modifications.

Q: What is the significance of the forward voltage difference in BYM11-400-E3/96?

A: The BYM11-400-E3/96 specifies 1.3 V maximum forward voltage at 1 A, compared to 1.1 V for the LL4004G L0. This 0.2 V difference results in slightly higher power dissipation in the diode. For applications with tight thermal budgets or high-frequency switching, verify that the increased forward voltage does not exceed thermal design limits.

Q: Do all substitute parts meet RoHS compliance requirements?

A: All listed substitute parts are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the environmental compliance profile of the original LL4004G L0. No additional handling or storage procedures are required.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and bulk packaging. Selection depends on production volume and assembly process requirements. All packaging options contain identical electrical components in the DO-213AB MELF package.

Q: Is the extended operating temperature range of substitute parts a concern?

A: The extended operating temperature range to 175°C for substitute parts provides additional thermal margin compared to the LL4004G L0 specification of -65°C to 150°C. This represents an improvement in component capability and does not create compatibility issues for applications operating within the original temperature range.

Q: Can I mix different substitute part numbers in the same assembly?

A: All listed substitute parts meet the critical electrical specifications (400 V, 1 A, 1.1 V forward voltage, DO-213AB MELF package). Mixing part numbers within the same assembly is acceptable from an electrical standpoint. However, design documentation should specify the approved substitute part list to maintain traceability and ensure consistent performance across production batches.

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