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LL4148-7 Equivalent & Substitute Parts
Part Overview
The LL4148-7 is a general-purpose rectifier diode rated for 75 V DC reverse voltage and 150 mA average rectified current in a surface mount SOD-80 MiniMELF package. This part is manufactured by Vishay General Semiconductor - Diodes Division and carries Automotive grade qualification with AEC-Q101 certification. The LL4148-7 is classified as Obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility with the SOD-80 MiniMELF package and preserve the electrical performance characteristics required for automotive applications.
Substiute Parts
Key Parameters
| Parameter | LL4148-7 Value |
|---|---|
| Voltage - DC Reverse (Vr) (Max) | 75 V |
| Current - Average Rectified (Io) | 150 mA |
| Voltage - Forward (Vf) (Max) @ If | 1 V @ 50 mA |
| Reverse Recovery Time (trr) | 8 ns |
| Current - Reverse Leakage @ Vr | 5 µA @ 75 V |
| Capacitance @ Vr, F | 4 pF @ 0 V, 1 MHz |
| Package / Case | DO-213AC, MINI-MELF, SOD-80 |
| Operating Temperature - Junction (Max) | 175°C |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the LL4148-7 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:
Mandatory Compatibility Parameters:
- Voltage - DC Reverse (Vr) (Max): 75 V
- Package / Case: DO-213AC, MINI-MELF, SOD-80
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Functional Equivalence Parameters:
- Current - Average Rectified (Io): 150 mA or higher
- Voltage - Forward (Vf) (Max) @ If: 1 V or lower at specified current
- Reverse Recovery Time (trr): 8 ns or faster
- Current - Reverse Leakage @ Vr: 5 µA or lower at 75 V
- Capacitance @ Vr, F: 4 pF @ 0 V, 1 MHz
Substitute parts are grouped into two categories: Parametric Equivalents (matching all key electrical specifications) and Direct Manufacturer Alternatives (offering enhanced performance within the same package).
Parameter Comparison
| Parameter | LL4148-7 | LS4148-GS08 | LS4148-GS18 | LL4148-GS08 | CLL4448 BK PBFREE | CDSL4148-G |
|---|---|---|---|---|---|---|
| Manufacturer | Vishay | Vishay | Vishay | Vishay | Central Semiconductor | Comchip Technology |
| Voltage - DC Reverse (Vr) (Max) | 75 V | 75 V | 75 V | 75 V | 75 V | 75 V |
| Current - Average Rectified (Io) | 150 mA | 150 mA | 150 mA | 300 mA | 250 mA | 150 mA |
| Voltage - Forward (Vf) (Max) @ If | 1 V @ 50 mA | 1 V @ 50 mA | 1 V @ 50 mA | 1 V @ 50 mA | 1 V @ 100 mA | 1 V @ 100 mA |
| Reverse Recovery Time (trr) | 8 ns | 8 ns | 8 ns | 4 ns | 4 ns | 4 ns |
| Current - Reverse Leakage @ Vr | 5 µA @ 75 V | 5 µA @ 75 V | 5 µA @ 75 V | 5 µA @ 75 V | 25 nA @ 20 V | 2.5 µA @ 75 V |
| Capacitance @ Vr, F | 4 pF @ 0 V, 1 MHz | 4 pF @ 0 V, 1 MHz | 4 pF @ 0 V, 1 MHz | 4 pF @ 0 V, 1 MHz | 4 pF @ 0 V, 1 MHz | 4 pF @ 0 V, 1 MHz |
| Package / Case | DO-213AC, MINI-MELF, SOD-80 | DO-213AC, MINI-MELF, SOD-80 | DO-213AC, MINI-MELF, SOD-80 | DO-213AC, MINI-MELF, SOD-80 | DO-213AC, MINI-MELF, SOD-80 | DO-213AC, MINI-MELF, SOD-80 |
| Operating Temperature - Junction (Max) | 175°C | 175°C | 175°C | 175°C | 200°C | 175°C |
| Grade | Automotive | Automotive | Automotive | Not specified | Not specified | Not specified |
| Qualification | AEC-Q101 | AEC-Q101 | AEC-Q101 | Not specified | Not specified | Not specified |
| Product Status | Obsolete | Active | Active | Active | Active | Obsolete |
| RoHS Status | 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) |
Engineering Selection Recommendations
Parametric Equivalents with Automotive Qualification:
LS4148-GS08 and LS4148-GS18 are parametric equivalents manufactured by Vishay General Semiconductor - Diodes Division. Both parts maintain identical electrical specifications to the LL4148-7, including 75 V reverse voltage, 150 mA average rectified current, 8 ns reverse recovery time, and automotive-grade AEC-Q101 qualification. Both parts are classified as Active products, ensuring long-term availability and supply chain continuity. LS4148-GS08 and LS4148-GS18 are suitable for direct replacement in automotive applications requiring AEC-Q101 compliance.
Direct Manufacturer Alternative with Enhanced Performance:
LL4148-GS08 is an active product from Vishay offering enhanced current rating of 300 mA with faster reverse recovery time of 4 ns, while maintaining the same 75 V reverse voltage and SOD-80 package. This part provides performance headroom for applications requiring higher current capacity. However, automotive grade and AEC-Q101 qualification status are not specified for this part.
Alternative Manufacturer Option:
CLL4448 BK PBFREE from Central Semiconductor Corp is an active product rated for 75 V reverse voltage and 250 mA average rectified current with 4 ns reverse recovery time. This part offers intermediate current capacity between the LL4148-7 and LL4148-GS08. Automotive grade and AEC-Q101 qualification status are not specified. Operating temperature range extends to 200°C maximum junction temperature.
Obsolete Parametric Equivalent:
CDSL4148-G from Comchip Technology is classified as Obsolete and carries identical electrical specifications to the LL4148-7 (75 V, 150 mA, 8 ns trr). This part is not recommended for new designs due to obsolete status, though it may be considered for legacy system support where existing inventory is available.
Frequently Asked Questions (FAQ)
Q: Can LS4148-GS08 or LS4148-GS18 be used as direct replacements for LL4148-7 in automotive applications?
A: Yes. LS4148-GS08 and LS4148-GS18 are parametric equivalents with identical electrical specifications (75 V, 150 mA, 8 ns reverse recovery time) and maintain automotive-grade AEC-Q101 qualification. Both parts are classified as Active products, ensuring supply continuity. The SOD-80 MiniMELF package is identical across all three parts.
Q: What is the difference between LS4148-GS08 and LS4148-GS18?
A: Both parts are parametric equivalents with identical electrical specifications and automotive qualification. The primary difference is packaging format: LS4148-GS08 is supplied in Cut Tape (CT) & Digi-Reel format, while LS4148-GS18 is also supplied in Cut Tape (CT) & Digi-Reel format. Inventory levels differ, with LS4148-GS08 offering significantly higher availability (147,400 pcs vs. 9,800 pcs).
Q: Can LL4148-GS08 replace LL4148-7 in all applications?
A: LL4148-GS08 offers enhanced performance with 300 mA current rating and 4 ns reverse recovery time compared to the LL4148-7 specifications. The part maintains 75 V reverse voltage and SOD-80 package compatibility. However, automotive grade and AEC-Q101 qualification status are not specified for LL4148-GS08. For automotive applications requiring AEC-Q101 compliance, LS4148-GS08 or LS4148-GS18 are recommended.
Q: Is CLL4448 BK PBFREE suitable for automotive applications?
A: CLL4448 BK PBFREE maintains 75 V reverse voltage and SOD-80 package compatibility with enhanced 250 mA current rating and 4 ns reverse recovery time. However, automotive grade and AEC-Q101 qualification status are not specified for this part. For applications requiring automotive qualification, LS4148-GS08 or LS4148-GS18 are recommended.
Q: Why is CDSL4148-G not recommended despite matching electrical specifications?
A: CDSL4148-G is classified as Obsolete, which limits long-term availability and supply chain support. While electrical specifications match the LL4148-7, the obsolete status makes this part unsuitable for new designs. Active alternatives such as LS4148-GS08 or LS4148-GS18 provide equivalent performance with assured supply continuity.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed (LS4148-GS08, LS4148-GS18, LL4148-GS08, CLL4448 BK PBFREE, and CDSL4148-G) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the LL4148-7 environmental compliance profile.
Q: What is the operating temperature range difference between substitute parts?
A: The LL4148-7, LS4148-GS08, LS4148-GS18, and CDSL4148-G specify maximum junction temperature of 175°C. LL4148-GS08 specifies operating temperature range of -65°C to 175°C. CLL4448 BK PBFREE extends maximum junction temperature to 200°C. For applications operating near thermal limits, CLL4448 BK PBFREE offers additional thermal margin.
Q: Can substitute parts with higher current ratings be used in place of LL4148-7?
A: Yes. Parts with higher current ratings (LL4148-GS08 at 300 mA and CLL4448 BK PBFREE at 250 mA) are electrically compatible with the LL4148-7 circuit requirements. Higher current ratings provide design margin and do not degrade performance in applications requiring 150 mA or less. All substitute parts maintain the same 75 V reverse voltage and SOD-80 package.
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