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Diodes Incorporated MMBD4148W-7
- Part No.:
- MMBD4148W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBD4148W-7.pdf
- Description:
- DIODE GEN PURP 75V 150MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,226
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Product details
Overview
MMBD4148W-7 from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in SOT323 package, rated for 75 V peak repetitive reverse voltage, 300 mA forward current, and 4.0 ns reverse recovery time. It delivers high conductance with VF = 0.715 V at IF = 1.0 mA and low junction-to-ambient thermal resistance (625 °C/W), enabling use in compact DC-DC converter flyback snubbers and signal routing circuits.
For engineers reviewing the MMBD4148W-7 datasheet, MMBD4148W-7 pinout, MMBD4148W-7 application, or MMBD4148W-7 equivalent, key selection criteria include reverse recovery speed, low forward voltage at low currents, thermal derating behavior on FR4 PCBs, and compatibility with automated SMT assembly for high-density consumer and industrial control boards.
Technical Context
This diode employs a planar epitaxial silicon structure optimized for fast minority-carrier recombination, achieving trr ≤ 4.0 ns under IF = IR = 10 mA, RL = 100 Ω test conditions. Its low CT = 2.0 pF at VR = 0 V, f = 1 MHz supports high-frequency signal switching without excessive capacitive loading.
The device operates across –55 °C to +150 °C and is qualified to JEDEC reliability standards for high-reliability applications. Its SOT323 package uses matte tin-plated Alloy 42 leads and green molding compound compliant with RoHS 3 and halogen-free requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 75 V - Maximum repetitive reverse voltage before avalanche conduction; sets safe blocking margin in 24–48 V power rail clamping |
| IF | 300 mA - Continuous forward current rating on standard FR4 layout; defines max steady-state signal path current |
| trr | 4.0 ns - Measured reverse recovery time; enables reliable operation up to ~100 MHz digital switching |
| VF @ 1 mA | 0.715 V - Low forward drop at sensing/low-power logic levels; minimizes voltage loss in level-shifting paths |
| CT | 2.0 pF @ 0 V - Junction capacitance at zero bias; limits high-frequency insertion loss in RF sampling circuits |
| RθJA | 625 °C/W - Thermal resistance on FR4; requires <200 mW dissipation to stay below 125 °C junction temp |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount package (2.15 mm × 2.10 mm × 0.95 mm), lead-free, halogen-free, RoHS 3 compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node in clamping or rectification; polarity marked by cathode band on package top view |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Typically tied to ground or lower-voltage rail; serves as reference for voltage clamp threshold |
| Case / Heat Sink (Pin 3) | Non-connected internal die attach pad | Not electrically functional; provides mechanical stability and minor thermal relief via PCB copper area |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | trr ≤ 4.0 ns enables clean edge transitions in 5–50 MHz clock distribution and pulse shaping |
| Ultra-small SOT323 footprint | 2.15 mm × 2.10 mm area saves >60% board space vs. SOT23 in dense sensor interface layouts |
| High conductance at low current | VF = 0.715 V @ 1 mA improves accuracy in precision analog switch and sample-hold front-ends |
| JEDEC-qualified reliability | Qualified per AEC-Q stress test references for extended life in industrial temperature cycling environments |
Applications
| DC-DC Converter Snubber | Digital Signal Clamping |
|---|---|
Use Scenario: Placed across MOSFET drain-source in flyback converters to suppress voltage spikes during turn-off. IC Role / Device Role: Fast-recovery clamp diode absorbing inductive kick energy. Use Value: 4.0 ns trr and 75 V VRRM prevent secondary breakdown while minimizing switching loss. | Use Scenario: Connected between microcontroller I/O and external 5 V bus to limit input voltage excursion. IC Role / Device Role: Bidirectional ESD and overvoltage protection element. Use Value: Low CT = 2.0 pF avoids signal integrity degradation on 10–25 MHz data lines. |
| Logic-Level Translation | Peak Detector Front-End |
Use Scenario: Used in passive level shifter between 1.8 V MCU and 3.3 V peripheral interface. IC Role / Device Role: Forward-biased voltage-drop element establishing offset between logic domains. Use Value: VF = 0.715 V @ 1 mA ensures predictable 0.7 V offset with minimal current draw. | Use Scenario: Input stage of analog peak detector circuit capturing transient sensor pulses. IC Role / Device Role: High-speed charging path for hold capacitor during positive signal peaks. Use Value: 300 mA IF rating supports rapid capacitor charge without forward voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS16W-7-F | Identical electrical specs, same SOT323 package, dual-marked part per Diodes datasheet DS30094 | No functional difference; BAS16W-7-F is cross-marked equivalent with identical production lot traceability | Select based on BOM legacy or distributor stock availability; no design change required |
| 1N4148WS-7-F | Slightly higher VF = 0.855 V @ 10 mA; otherwise matches VRRM, trr, and package | Acceptable in general-purpose switching but less optimal in low-current precision biasing | Prefer MMBD4148W-7 where sub-0.75 V forward drop at µA–mA levels is critical |
Compared with BAS16W-7-F (identical) and 1N4148WS-7-F (higher VF), MMBD4148W-7 offers the lowest verified forward voltage at 1 mA-making it preferred for low-power signal conditioning and battery-sensitive designs where every millivolt of drop matters.
Availability
MMBD4148W-7 is available at Aetrix Electronics and suitable for DC-DC converter snubbers, digital I/O clamping, logic-level translation, and peak detector front-ends requiring stable component supply across automotive, industrial control, and consumer electronics programs.
Supply support for MMBD4148W-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBD4148W-7 belongs to Diodes' general-purpose fast-switching diode product line, engineered for high-volume SMT deployment in cost-sensitive, space-constrained applications demanding consistent switching performance and JEDEC reliability.
FAQ
Is MMBD4148W-7 suitable for automotive applications?
No-MMBD4148W-7 is not AEC-Q200 qualified. Diodes offers automotive-grade variants (e.g., MMBD4148WQ-7-F) with PPAP documentation, IATF 16949 manufacturing, and full AEC-Q200 stress testing. Use only the Q-suffix version for automotive ECUs or ADAS modules.
What is the maximum allowable PCB trace width for thermal relief on the SOT323 pads?
Per Diodes' recommended pad layout (SOT323 outline doc), each pad should be 0.65 mm wide × 0.47 mm long with 0.65 mm spacing. Thermal relief traces must be ≥0.2 mm wide and connect to ≥10 mm² copper pour to achieve the specified RθJA = 625 °C/W on FR4.
Does MMBD4148W-7 have a built-in ESD protection structure?
No-MMBD4148W-7 is a basic PN-junction switching diode without integrated ESD clamps. Its 1.0 µA IR at VR = 75 V reflects standard leakage, not ESD robustness. For I/O protection, pair with dedicated TVS devices like D1213A-03LP or use in series with current-limiting resistors.
Can MMBD4148W-7 replace 1N4148 in through-hole designs?
Only with PCB redesign: MMBD4148W-7 is SOT323 surface-mount and incompatible with through-hole footprints. While electrically similar, its 4.0 ns trr and 0.715 V VF @ 1 mA exceed classic 1N4148 specs, but mechanical replacement requires SMT rework and stencil changes.
MMBD4148W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io):
- 150mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 150 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 75 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- -65°C ~ 150°C
MMBD4148W-7 FAQ
1.How can I place an order for MMBD4148W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBD4148W-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 MMBD4148W-7 reliable?
The price and inventory of MMBD4148W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBD4148W-7 is usually 5 days.
3.What payment methods are accepted for MMBD4148W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBD4148W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBD4148W-7?
MMBD4148W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBD4148W-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 MMBD4148W-7?
For technical support, including MMBD4148W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBD4148W-7 requirements.
6.How does Aetrix verify that MMBD4148W-7 is sourced from the original manufacturer or authorized distributors?
All MMBD4148W-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 MMBD4148W-7 meets industry standards.
7.What is the process for return or replacement of MMBD4148W-7?
All MMBD4148W-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBD4148W-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 MMBD4148W-7 part is unused and in its original packaging.
Return procedure for MMBD4148W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBD4148W-7 Tags
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1N4448X-TP
Micro Commercial Co
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1N4148WX-TP
Micro Commercial Co
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1N4148TR
onsemi
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MMSD4148T1G
onsemi
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MMBD914LT3G
onsemi
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BAS16HT1G
onsemi
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1N914BWT
onsemi
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BAS21LT1G
onsemi
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LL4148
onsemi
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BAS16LT1G
onsemi
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MMSD914T1G
onsemi
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BAV21W-7-F
Diodes Incorporated
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