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Diodes Incorporated MMBD4448W-7
- Part No.:
- MMBD4448W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- -
- Datasheet:
-
MMBD4448W-7.pdf
- Description:
- DIODE GEN PURP 75V 250MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:15,119
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Product details
Overview
MMBD4448W-7 from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in SOT323 package, rated for 75 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time. It delivers high conductance with VF = 0.72 V at IF = 10 mA and low leakage (IR ≤ 1.0 µA at VR = 75 V), used in high-speed signal routing, clamping, and level-shifting circuits in consumer and industrial power management systems.
For engineers reviewing the MMBD4448W-7 datasheet, MMBD4448W-7 pinout, MMBD4448W-7 application, or MMBD4448W-7 equivalent, this page provides verified electrical parameters, thermal derating behavior, polarity identification, SOT323 footprint compatibility, and direct alternatives for fast-switching discrete diode selection in space-constrained PCB layouts.
Technical Context
This diode operates as a unidirectional, PN-junction switching device optimized for high-speed transitions between forward conduction and reverse blocking states. Its 4.0 ns trr and low junction capacitance (CT = 2.0 pF at VR = 0 V, f = 1 MHz) enable reliable performance in >10 MHz digital signal conditioning and pulse shaping applications.
The device exhibits stable reverse breakdown at V(BR)R ≥ 75 V (IR = 10 µA) and maintains low forward voltage drop across 5–150 mA load range (VF = 0.62–1.25 V), supporting efficient operation in low-voltage logic interface and transient suppression circuits where minimal forward loss and rapid turn-off are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Repetitive Reverse Voltage (VRRM) | 75 V - Maximum continuous reverse bias before avalanche conduction begins; defines safe operating window in clamp and flyback snubber circuits. |
| Forward Current (IFM) | 500 mA - Continuous DC current handling capability under FR-4 PCB thermal conditions; supports moderate-power signal path switching. |
| Reverse Recovery Time (trr) | 4.0 ns - Measured at IF = IR = 10 mA, RL = 100 Ω; enables clean edge transitions in >100 Mbps digital interfaces. |
| Junction-to-Ambient Thermal Resistance (RθJA) | 625 °C/W - Based on 1-inch² FR-4 pad layout; determines maximum power dissipation (200 mW) before exceeding 150°C junction temperature. |
| Forward Voltage (VF) | 0.72 V @ IF = 10 mA - Low conduction loss ensures minimal voltage offset in precision level-shifters and active rectifiers. |
| Reverse Leakage Current (IR) | ≤1.0 µA @ VR = 75 V, TA = 25°C - Ensures high isolation integrity in sample-and-hold and analog multiplexer front-ends. |
| Total Capacitance (CT) | 2.0 pF @ VR = 0 V, f = 1 MHz - Low parasitic capacitance preserves signal integrity in RF detector and high-frequency timing circuits. |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount package (2.15 × 2.10 × 0.95 mm), lead-free, halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to lower-potential node in forward-biased configuration; marked by cathode band on top view. |
| Cathode (K) | Forward current exit / reverse blocking terminal | Connected to higher-potential node; polarity indicator (bar) adjacent to this pin in top-view schematic. |
| Case / Heat Sink (not electrically isolated) | Thermal path only | Non-functional terminal; internal die attach connects to cathode; no electrical isolation from K pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4.0 ns reverse recovery time enables use in >100 MHz clock distribution and pulse-width modulation feedback paths. |
| Small surface-mount package | SOT323 footprint (2.15 × 2.10 mm) allows placement in dense BGA escape routing and portable device power rails. |
| High conductance | Low VF (0.72 V @ 10 mA) and steep I–V slope reduce dynamic power loss in high-duty-cycle switching nodes. |
| Lead-free & RoHS compliant | Fully compliant with EU RoHS 2015/863/EU and halogen-free (<900 ppm Br/Cl, <1000 ppm Sb); qualified for automotive change control upon request. |
Applications
| Signal Clamping in High-Speed Data Lines | Level Shifting for Mixed-Voltage Logic Interfaces |
|---|---|
Use Scenario: Protecting USB 2.0 or LVDS receiver inputs from ESD-induced overvoltage transients while preserving signal rise/fall times. IC Role / Device Role: Fast-clamp diode connected between data line and VDD/VSS rail to shunt excess energy without latch-up. Use Value: 4.0 ns trr and 2.0 pF CT prevent signal distortion; 75 V VRRM accommodates common-mode surges up to ±30 V. | Use Scenario: Translating 3.3 V GPIO outputs to 5 V microcontroller inputs in industrial PLC modules. IC Role / Device Role: Passive level translator using forward-biased diode drop to offset logic thresholds. Use Value: Consistent 0.72 V VF at 10 mA ensures predictable high-level shift; SOT323 enables placement adjacent to connector pins. |
| Active Rectification in Low-Power DC-DC Converters | Transient Suppression in Automotive Sensor Signal Conditioning |
Use Scenario: Replacing Schottky diodes in synchronous buck converter auxiliary paths where cost and size outweigh ultra-low VF requirements. IC Role / Device Role: Unidirectional current valve in secondary-side rectification stage of isolated flyback supplies. Use Value: 500 mA IFM and 200 mW PD support 1–2 W output stages; 625 °C/W RθJA allows operation without heatsink on standard PCBs. | Use Scenario: Filtering noise and suppressing load-dump spikes on analog sensor outputs (e.g., pressure or temperature sensors) in 12 V automotive subsystems. IC Role / Device Role: Reverse-polarity protection and transient clamp in signal chain front-end before ADC input. Use Value: 75 V VRRM withstands ISO 7637-2 Pulse 5a (load dump up to 60 V); 1.0 µA IR ensures negligible offset error at 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54W-7-F | Schottky structure; lower VF (0.33 V @ 10 mA) but higher IR (2 µA @ 25 V); VRRM = 30 V. | Better for low-voltage, low-loss rectification; unsuitable for >30 V reverse blocking. | Select when forward loss dominates design priority and reverse voltage stays below 30 V. |
| 1N4148W-7-F | Same SOT323 package; slower trr (4 ns typical but up to 8 ns max); identical VRRM (100 V) and IFM (300 mA). | Marginally lower speed and current rating; widely available legacy option. | Choose for cost-sensitive, non-critical timing applications where 4–8 ns variation is acceptable. |
Compared with BAT54W-7-F and 1N4148W-7-F, MMBD4448W-7 offers optimal balance of speed (4.0 ns trr), reverse voltage margin (75 V), and thermal robustness (500 mA/200 mW), making it preferred for mid-voltage, high-frequency signal integrity tasks where Schottky leakage or legacy diode slowness is unacceptable.
Availability
MMBD4448W-7 is available at Aetrix Electronics and suitable for high-speed signal clamping, mixed-voltage logic interfacing, active rectification in low-power DC-DC converters, and automotive sensor signal conditioning requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBD4448W-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 the Americas.
The MMBD4448W-7 belongs to Diodes' general-purpose fast-switching diode product line, engineered for high-reliability signal routing and voltage translation in compact, thermally constrained PCB environments.
FAQ
What is the maximum junction temperature for MMBD4448W-7?
The absolute maximum junction temperature is +150°C, with storage temperature matching that range (−55°C to +150°C). Derating begins at +25°C ambient per the published curve: power dissipation drops linearly to zero at +150°C ambient, based on 625°C/W RθJA on standard FR-4 layout.
Is MMBD4448W-7 suitable for automotive applications?
MMBD4448W-7 is not pre-qualified to AEC-Q101, but Diodes Incorporated offers automotive-grade variants (e.g., MMBD4448WQ-7) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. Standard MMBD4448W-7 may be used in non-safety-critical automotive subsystems pending customer qualification.
How is polarity identified on the SOT323 package?
Polarity is marked by a cathode band (dark bar) adjacent to Pin 2 (Cathode) on the top surface. Per Diodes' top-view diagram, Pin 1 (Anode) is at the left end, Pin 2 (Cathode) at the right end, with the marking bar aligned to the Cathode side - confirmed in DS30095 Rev. 14-2 Figure "Top View".
Does MMBD4448W-7 have a specified junction capacitance vs. reverse voltage curve?
Yes - CT = 2.0 pF is specified at VR = 0 V, f = 1 MHz. While no full CV curve is tabulated, Figure 3 in DS30095 shows typical reverse current vs. voltage, and the low 2.0 pF value remains stable below 20 V reverse bias, supporting use in RF detector and clock buffer applications up to ~500 MHz.
MMBD4448W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- -
- Voltage - DC Reverse (Vr) (Max):
- -
- Current - Average Rectified (Io):
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- -
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- -
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -
MMBD4448W-7 FAQ
1.How can I place an order for MMBD4448W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBD4448W-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 MMBD4448W-7 reliable?
The price and inventory of MMBD4448W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBD4448W-7 is usually 5 days.
3.What payment methods are accepted for MMBD4448W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBD4448W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBD4448W-7?
MMBD4448W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBD4448W-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 MMBD4448W-7?
For technical support, including MMBD4448W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBD4448W-7 requirements.
6.How does Aetrix verify that MMBD4448W-7 is sourced from the original manufacturer or authorized distributors?
All MMBD4448W-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 MMBD4448W-7 meets industry standards.
7.What is the process for return or replacement of MMBD4448W-7?
All MMBD4448W-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBD4448W-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 MMBD4448W-7 part is unused and in its original packaging.
Return procedure for MMBD4448W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBD4448W-7 Tags
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1N4448X-TP
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1N4148WX-TP
Micro Commercial Co
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1N4148TR
onsemi
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MMSD4148T1G
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MMBD914LT3G
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BAS16HT1G
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1N914BWT
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BAS21LT1G
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LL4148
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MMSD914T1G
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BAV21W-7-F
Diodes Incorporated
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