DL4148 Equivalent & Substitute Parts

Part Overview

The DL4148 is a general-purpose switching diode manufactured by Micro Commercial Co, rated for 75 V DC reverse voltage and 150 mA average rectified current in a Surface Mount Mini MELF package (DO-213AC, SOD-80). This component is classified as Obsolete, indicating discontinuation from the original manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	150	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 10 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5	µA @ 75 V
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Operating Temperature - Junction (Max)	175	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DL4148 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 75 V minimum
Current - Average Rectified (Io): 150 mA minimum
Package / Case: DO-213AC, MINI-MELF, SOD-80 (identical physical form factor)
Mounting Type: Surface Mount
Speed Classification: Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr): 4 ns nominal
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 75 V

Substitute Categories:

Full Parametric Equivalents (identical electrical and mechanical specifications):

LL4148 (Good-Ark Semiconductor)
CDSL4148-G (Comchip Technology)
LS4148-GS08 (Vishay General Semiconductor - Diodes Division)
LS4148-GS18 (Vishay General Semiconductor - Diodes Division)

Partial Parametric Equivalent (meets voltage and current requirements; different reverse recovery time specification):

PMLL4153,115 (Nexperia USA Inc.) — 50 V rating; 200 mA current; 4 ns trr; not recommended for direct substitution in 75 V applications

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
DL4148	Micro Commercial Co	75	150	1 @ 10 mA	4	5 @ 75 V	DO-213AC, MINI-MELF, SOD-80	Obsolete	RoHS non-compliant
LL4148	Good-Ark Semiconductor	75	150	1 @ 10 mA	4	5 @ 75 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
CDSL4148-G	Comchip Technology	75	150	1 @ 100 mA	4	2.5 @ 75 V	DO-213AC, MINI-MELF, SOD-80	Obsolete	ROHS3 Compliant
LS4148-GS08	Vishay General Semiconductor - Diodes Division	75	150	1 @ 50 mA	8	5 @ 75 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
LS4148-GS18	Vishay General Semiconductor - Diodes Division	75	150	1 @ 50 mA	8	5 @ 75 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
PMLL4153,115	Nexperia USA Inc.	50	200	0.88 @ 50 mA	4	0.05 @ 50 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (Full Parametric Equivalents):

LL4148 (Good-Ark Semiconductor) — Active product status with ROHS3 compliance. Identical electrical specifications to DL4148 across all critical parameters. Highest inventory availability (6,713,100 pcs). Suitable for direct replacement in all applications.
LS4148-GS08 or LS4148-GS18 (Vishay General Semiconductor - Diodes Division) — Active product status with ROHS3 compliance and AEC-Q101 automotive qualification. Reverse recovery time specification of 8 ns (versus 4 ns nominal) represents acceptable variance within small-signal diode performance envelope. Automotive-grade qualification provides enhanced reliability documentation. Recommended for applications requiring automotive-grade components or long-term supply assurance.

Secondary Substitute (Obsolete Status):

CDSL4148-G (Comchip Technology) — Obsolete product status with ROHS3 compliance. Identical voltage and current ratings; reverse leakage current specification of 2.5 µA @ 75 V is superior to DL4148 specification. Not recommended for new designs due to obsolete classification; suitable only for legacy system maintenance where existing inventory exists.

Not Recommended:

PMLL4153,115 (Nexperia USA Inc.) — Voltage rating of 50 V is insufficient for applications designed for 75 V operation. This part does not meet the primary substitution criterion of minimum 75 V reverse voltage rating and is not suitable as a direct replacement.

Frequently Asked Questions (FAQ)

Q: Can LL4148 be used as a direct replacement for DL4148?

A: Yes. LL4148 meets all electrical and mechanical specifications of DL4148, including 75 V reverse voltage, 150 mA average rectified current, 4 ns reverse recovery time, and identical DO-213AC/MINI-MELF/SOD-80 package. LL4148 is Active product status with ROHS3 compliance, providing superior supply chain availability compared to the Obsolete DL4148.

Q: What is the difference between LS4148-GS08 and LS4148-GS18?

A: Both parts are electrically and mechanically identical. The designation suffix (-GS08 versus -GS18) indicates different manufacturing date codes or tape reel configurations. Both are Active products with AEC-Q101 automotive qualification and ROHS3 compliance. Selection between these variants is determined by packaging and delivery requirements rather than electrical performance.

Q: Why is the reverse recovery time (trr) specification different for LS4148-GS08/GS18 (8 ns) compared to DL4148 (4 ns)?

A: The LS4148-GS08 and LS4148-GS18 variants specify 8 ns reverse recovery time, which is within acceptable performance variance for small-signal switching diodes. This specification difference does not preclude substitution in applications where the DL4148 was originally specified, as both values fall within the small-signal diode performance classification (≤ 200 mA). Applications with critical timing requirements should evaluate circuit performance with the 8 ns specification.

Q: Is PMLL4153,115 compatible with DL4148?

A: No. PMLL4153,115 has a maximum reverse voltage rating of 50 V, which is insufficient for applications designed for the DL4148's 75 V rating. This part does not meet the minimum voltage requirement for direct substitution and should not be used as a replacement.

Q: What does RoHS compliance mean for component selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the component meets regulatory requirements for hazardous substance restrictions. DL4148 is RoHS non-compliant (Obsolete product). All recommended substitutes (LL4148, CDSL4148-G, LS4148-GS08, LS4148-GS18) are ROHS3 compliant, meeting current regulatory standards for new designs and manufacturing.

Q: Can I use CDSL4148-G for new product designs?

A: CDSL4148-G is classified as Obsolete and is not recommended for new designs. Although it meets electrical specifications and has ROHS3 compliance, obsolete classification indicates discontinued manufacturing and limited future availability. Use LL4148 or LS4148-GS08/GS18 for new designs to ensure long-term supply chain continuity.

Q: What is the significance of AEC-Q101 qualification on LS4148-GS08 and LS4148-GS18?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. This certification indicates the component has undergone rigorous testing and quality assurance protocols required for automotive applications. Selection of AEC-Q101 qualified parts is appropriate for automotive, industrial, or mission-critical applications requiring enhanced reliability documentation and traceability.

Q: Are there packaging differences between substitute parts?

A: All recommended substitutes use identical DO-213AC/MINI-MELF/SOD-80 package specifications, ensuring mechanical and electrical compatibility on printed circuit boards. Packaging differences exist only in supplier delivery formats (Cut Tape, Tape & Reel, Digi-Reel), which do not affect component performance or board-level integration.

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