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Diodes Incorporated LL4148-7
- Part No.:
- LL4148-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
LL4148-7.pdf
- Description:
- DIODE GP 75V 150MA MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,245
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Product details
Overview
LL4148-7 from Diodes Incorporated is a fast-switching surface-mount silicon epitaxial planar diode in MiniMELF glass package, rated for 75 V peak repetitive reverse voltage, 300 mA forward current, and 4.0 ns reverse recovery time, used for general-purpose rectification and signal clamping in compact power supplies and digital logic interfaces.
For engineers reviewing the LL4148-7 datasheet, LL4148-7 pinout, LL4148-7 application, or LL4148-7 equivalent, key selection criteria include reverse recovery time, forward voltage at 10 mA, leakage current at 150°C, thermal resistance (300 K/W), and MiniMELF mechanical compatibility with high-density automated assembly.
Technical Context
The LL4148-7 operates as a unidirectional switching diode with cathode-band polarity marking and Sn97.5Ag2.5 solderable terminals. Its silicon epitaxial planar construction enables low capacitance (4.0 pF at 0 V) and stable leakage performance across -65°C to +175°C junction temperature range.
Designed for surface-mount automatic insertion, it delivers 1.0 A non-repetitive surge capability at 1.0 s and maintains 5.0 μA max reverse current at 75 V and 25°C - critical for noise-sensitive signal routing and transient suppression in mixed-signal PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRMM | 75 V - maximum DC blocking voltage before breakdown; defines safe operating margin in 5–24 V rail clamp circuits |
| IF | 300 mA - continuous forward current limit; sets usable current headroom for logic-level signal steering |
| trr | 4.0 ns - reverse recovery time measured at 10 mA → 1 mA transition; enables reliable operation up to ~100 MHz switching |
| VF @ 10 mA | ≤1.0 V - forward voltage drop; determines conduction loss and self-heating in low-duty-cycle pulse applications |
| CJ | 4.0 pF @ 0 V - junction capacitance; impacts high-frequency signal integrity in RF detector and sampling circuits |
| RθJA | 300 K/W - thermal resistance to ambient; requires board-level copper pour or airflow for sustained >150 mA operation |
Pinout & Package
MiniMELF glass package (3.30–3.70 mm length × 1.30–1.60 mm diameter), hermetically sealed, UL 94V-0 rated, with axial cathode band marking. No discrete pins - two axial terminals: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node during conduction; must withstand 300 mA continuous without bond-wire fusing |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by visible band; carries full reverse voltage stress up to 75 V and defines clamping reference in protection circuits |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4.0 ns trr enables use in 10–100 MHz digital signal routing and pulse shaping without tail distortion |
| MiniMELF surface-mount package | 0.05 g mass and 3.5 mm × 1.45 mm footprint support high-density placement and reflow compatibility with standard SMT lines |
| Silicon epitaxial planar construction | Ensures tight parameter distribution (VF, IR) across production lots for predictable BOM yield in volume manufacturing |
| RoHS-compliant Sn97.5Ag2.5 finish | Meets IPC-J-STD-020 Level 1 moisture sensitivity and supports lead-free reflow profiles up to 260°C peak |
Applications
| Logic-Level Clamping | ESD Protection Interface |
|---|---|
Use Scenario: Protecting CMOS input pins from overvoltage transients in microcontroller GPIO banks. IC Role / Device Role / Timing Role: Fast-clamp diode shunting excess voltage to VCC or GND rails during ESD events. Use Value: 4.0 ns trr and 5.0 μA IR at 75 V ensure minimal signal delay and no DC loading on high-impedance inputs. | Use Scenario: Bidirectional transient suppression on USB D+/D− lines prior to PHY interface. IC Role / Device Role / Timing Role: Low-capacitance (4.0 pF) steering diode limiting line-to-line and line-to-rail surges. Use Value: Minimal signal distortion at 480 Mbps due to sub-5 pF CJ and symmetric forward/reverse behavior. |
| Low-Power Rectification | Pulse Detection & Demodulation |
Use Scenario: Half-wave rectification in battery-powered sensor node power management (e.g., energy harvesting harvesters). IC Role / Device Role / Timing Role: General-purpose rectifier converting AC-coupled wake-up signals into DC logic pulses. Use Value: 300 mA IF rating and 1.0 V VF allow efficient conversion of µA–mA level pulses with <100 mW dissipation. | Use Scenario: Envelope detection in 13.56 MHz RFID reader front-end or IR remote receiver stages. IC Role / Device Role / Timing Role: High-speed demodulator diode extracting amplitude-modulated baseband signals. Use Value: 4.0 ns trr and low CJ preserve rise/fall fidelity of narrow RF pulses without ringing or droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148W-7 | Identical electrical specs; same MiniMELF package but marked per JEDEC 1N4148W standard | No functional difference; accepted interchangeably in legacy designs requiring JEDEC-compliant labeling | Select when documentation or procurement systems require JEDEC part numbering |
| BAS16W-7 | Lower VR (80 V), faster trr (3.0 ns), higher IF (225 mA avg), same MiniMELF | Better suited for >50 MHz clock line steering; not rated for 75 V DC blocking | Prefer for ultra-high-speed signal routing where voltage margin ≤60 V suffices |
Compared with LL4148-7, 1N4148W-7 offers identical performance with JEDEC alignment, while BAS16W-7 trades higher voltage rating for superior speed - making the latter optimal for RF signal paths below 60 V, and the former ideal for legacy compliance-driven builds.
Availability
LL4148-7 is available at Aetrix Electronics and suitable for compact power supplies, logic-level clamping circuits, ESD protection interfaces, and RF pulse detection requiring stable component supply and RoHS-compliant MiniMELF packaging.
Supply support for LL4148-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets since 1959.
The LL4148-7 belongs to Diodes' general-purpose fast-switching diode product line, engineered for reliability in automated SMT assembly and consistent parametric performance across wide temperature ranges.
FAQ
Is LL4148-7 suitable for new designs?
No - Diodes Incorporated explicitly marks LL4148-7 as "NOT RECOMMENDED FOR NEW DESIGN USE" in its official datasheet (DS12013 Rev. 10-3). It remains available for legacy production and repair, but newer alternatives like 1N4148W-7 or BAS16W-7 are preferred for design-in due to updated qualification and long-term supply assurance.
What is the cathode identification method on LL4148-7?
The cathode is identified by a single black band located near one end of the MiniMELF glass body. This band aligns with the cathode terminal, which must be connected toward the lower-potential side of the circuit to enable forward conduction and proper reverse blocking.
How does LL4148-7 perform at elevated temperatures?
At 150°C junction temperature, LL4148-7 exhibits ≤50 μA reverse leakage at 75 V, per datasheet specifications. Its -65°C to +175°C operating range and 300 K/W thermal resistance require adequate PCB copper area or airflow to maintain safe junction temperature under sustained 300 mA forward bias.
Can LL4148-7 replace through-hole 1N4148 in SMT layouts?
Yes - LL4148-7 is the surface-mount MiniMELF equivalent of the through-hole 1N4148, sharing identical electrical characteristics (VR, IF, trr, VF). However, its 3.5 mm × 1.45 mm footprint and reflow-compatible terminations require dedicated MiniMELF land patterns, not direct substitution onto axial-leaded pads.
LL4148-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AC, MINI-MELF, SOD-80
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io):
- 150mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 75 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
- Operating Temperature - Junction:
- -65°C ~ 175°C
LL4148-7 FAQ
1.How can I place an order for LL4148-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LL4148-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LL4148-7 reliable?
The price and inventory of LL4148-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LL4148-7 is usually 5 days.
3.What payment methods are accepted for LL4148-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LL4148-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LL4148-7?
LL4148-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LL4148-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LL4148-7?
For technical support, including LL4148-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LL4148-7 requirements.
6.How does Aetrix verify that LL4148-7 is sourced from the original manufacturer or authorized distributors?
All LL4148-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LL4148-7 meets industry standards.
7.What is the process for return or replacement of LL4148-7?
All LL4148-7 units undergo pre-shipment inspection (PSI). If there is an issue with LL4148-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LL4148-7 part is unused and in its original packaging.
Return procedure for LL4148-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LL4148-7 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
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