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Diodes Incorporated MMBD4448H-7
- Part No.:
- MMBD4448H-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBD4448H-7.pdf
- Description:
- DIODE GEN PURP 80V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,588
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Product details
Overview
MMBD4448H-7 from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in SOT23 package, rated for 80 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time. It delivers high conductance and low forward voltage (0.72 V @ 10 mA), suited for high-speed signal routing and clamping in consumer power supplies and telecom interface circuits.
For engineers reviewing the MMBD4448H-7 datasheet, MMBD4448H-7 pinout, MMBD4448H-7 application, or MMBD4448H-7 equivalent, key selection criteria include reverse recovery time, junction capacitance (3.5 pF @ 6 V), thermal resistance (357 °C/W), and SOT23 footprint compatibility with automated PCB assembly.
Technical Context
This diode employs a planar epitaxial construction optimized for fast transient response and low charge storage. Its 4.0 ns trr and 3.5 pF CT at 6 V enable clean edge handling in digital logic interfacing and pulse shaping circuits up to ~100 MHz.
The device operates across –65 °C to +150 °C and derates linearly above 25 °C ambient, maintaining 250 mA average rectified output and 350 mW power dissipation on FR-4 with recommended pad layout - critical for thermal reliability in compact DC-DC feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM / VRRM | 100 V / 80 V - supports transient suppression up to 100 V non-repetitive, safe continuous blocking at 80 V in flyback snubbers |
| IFM / IO | 500 mA / 250 mA - handles peak switching currents in low-power MOSFET gate drivers and logic-level clamps |
| VF @ 10 mA | 0.72 V - minimizes conduction loss in 3.3 V/5 V signal path clamping and level translation |
| trr | 4.0 ns - ensures minimal switching distortion in >25 MHz clock line protection and data line steering |
| CT @ 6 V | 3.5 pF - preserves signal integrity in RF detector inputs and high-frequency comparator reference paths |
| RθJA | 357 °C/W - requires controlled copper pour for sustained 250 mA operation above 70 °C ambient |
| TJ Range | –65 °C to +150 °C - qualified for under-hood automotive modules and industrial motor control PCBs |
Pinout & Package
SOT23-3 package: small-outline transistor outline with gull-wing leads, 0.008 g mass, UL 94V-0 molded plastic case, matte tin-plated Alloy 42 leadframe, moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry | Connected to higher-potential node in clamping, steering, or freewheeling paths |
| Cathode (Pin 2) | Forward current exit / reverse bias terminal | Typically tied to ground or lower-voltage rail; defines polarity-sensitive placement on PCB |
| No Connection (Pin 3) | Internal die attach flag / mechanical support | Not electrically active; must remain unconnected per Diodes Inc. schematic and marking diagram |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4.0 ns reverse recovery enables use in 50+ MHz digital signal routing without timing skew |
| High conductance | Low dynamic resistance yields <0.72 V VF at 10 mA, reducing insertion loss in analog switch paths |
| SOT23 surface mount | Compatible with standard pick-and-place equipment and reflow profiles for high-yield automated assembly |
| Lead-free/RoHS compliant | Meets JEDEC J-STD-020 Level 1 moisture sensitivity and IPC/JEDEC standard solderability requirements |
Applications
| USB Data Line Protection | DC-DC Converter Feedback Clamp |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines from ESD and overvoltage transients during hot-plug events. IC Role / Device Role / Timing Role: Fast-clamping diode placed between data line and VBUS or ground, conducting only during overvoltage excursions. Use Value: 4.0 ns trr prevents data corruption during 480 Mbps signaling; 3.5 pF CT avoids signal integrity degradation. | Use Scenario: Clamping error amplifier input in isolated flyback converters to prevent saturation during load transients. IC Role / Device Role / Timing Role: Reverse-biased shunt clamp limiting feedback node voltage swing to ±0.7 V around reference. Use Value: Low VF ensures precise voltage threshold; high VRRM (80 V) accommodates reflected primary-side spikes. |
| Logic-Level Signal Steering | RF Detector Input Protection |
Use Scenario: Selecting between two microcontroller GPIO outputs driving a shared peripheral bus. IC Role / Device Role / Timing Role: Anode-coupled OR-ing diode enabling bidirectional signal isolation without contention. Use Value: High IFM (500 mA) supports 5 V TTL drive strength; SOT23 footprint saves board space vs. SOIC. | Use Scenario: Shielding logarithmic RF detector IC inputs from antenna-coupled RF surges in IoT wireless receivers. IC Role / Device Role / Timing Role: Series-connected front-end limiter absorbing RF energy before sensitive detector input stage. Use Value: Low CT (3.5 pF) preserves detector bandwidth; 100 nA IR at 20 V ensures minimal DC offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54C-7-F | Lower VRRM (30 V), higher CT (10 pF), dual common-cathode configuration | Optimized for low-voltage (<3.3 V) logic clamping, not suitable for 80 V blocking | Select when dual-diode integration reduces component count in 3.3 V I/O protection |
| 1N4148W-7-F | Same VRRM (100 V), slower trr (4 ns typical but 8 ns max), higher VF (0.855 V @ 10 mA) | General-purpose replacement where 4 ns consistency is less critical than cost | Choose for legacy designs requiring proven reliability at lower frequency (<10 MHz) switching |
Compared with BAT54C-7-F and 1N4148W-7-F, MMBD4448H-7 uniquely balances 80 V blocking, 4.0 ns trr, and 3.5 pF CT in a single SOT23 diode - making it optimal for high-speed, medium-voltage signal conditioning where both speed and voltage margin matter.
Availability
MMBD4448H-7 is available at Aetrix Electronics and suitable for USB interface protection, DC-DC feedback clamping, logic-level signal steering, and RF detector input protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBD4448H-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, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
The MMBD4448H belongs to Diodes' general-purpose switching diode product line, engineered specifically for high-speed, low-capacitance signal routing and clamping in space-constrained, automated-assembly environments.
FAQ
What is the maximum reverse voltage the MMBD4448H-7 can block continuously?
The MMBD4448H-7 has a peak repetitive reverse voltage (VRRM) rating of 80 V, meaning it can continuously block up to 80 V DC or sinusoidal reverse voltage without breakdown. Its non-repetitive peak reverse voltage (VRM) is 100 V, allowing brief transient tolerance beyond that limit.
Is Pin 3 of the SOT23 package electrically connected?
No - Pin 3 is internally unconnected (NC) and serves only as a mechanical flag for die attachment. Diodes Incorporated's official schematic and top-view marking diagram confirm it must remain floating and unconnected in circuit design and PCB layout.
How does the MMBD4448H-7 perform at elevated temperatures?
It operates from –65 °C to +150 °C. At 150 °C junction temperature, its reverse current rises to 50 μA at 75 V, and power dissipation must be derated to ~120 mW (per Fig. 1 curve), requiring careful thermal design on FR-4 boards with recommended pad layout.
Can the MMBD4448H-7 replace a 1N4148 in high-frequency circuits?
Yes - with qualification. Its 4.0 ns trr is tighter than the 1N4148W-7-F's 8 ns maximum, and its 3.5 pF CT is significantly lower than the 1N4148's ~4 pF typical. However, verify layout parasitics and ensure VRRM (80 V) meets system requirements, as some 1N4148 variants specify 100 V VRM.
MMBD4448H-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 80 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 150 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 70 V
- Capacitance @ Vr, F:
- 3.5pF @ 6V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
- Operating Temperature - Junction:
- -65°C ~ 150°C
MMBD4448H-7 FAQ
1.How can I place an order for MMBD4448H-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBD4448H-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 MMBD4448H-7 reliable?
The price and inventory of MMBD4448H-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBD4448H-7 is usually 5 days.
3.What payment methods are accepted for MMBD4448H-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBD4448H-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBD4448H-7?
MMBD4448H-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBD4448H-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 MMBD4448H-7?
For technical support, including MMBD4448H-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBD4448H-7 requirements.
6.How does Aetrix verify that MMBD4448H-7 is sourced from the original manufacturer or authorized distributors?
All MMBD4448H-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 MMBD4448H-7 meets industry standards.
7.What is the process for return or replacement of MMBD4448H-7?
All MMBD4448H-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBD4448H-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 MMBD4448H-7 part is unused and in its original packaging.
Return procedure for MMBD4448H-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBD4448H-7 Tags
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