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Diodes Incorporated MMBD4448HW-7
- Part No.:
- MMBD4448HW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBD4448HW-7.pdf
- Description:
- DIODE GEN PURP 80V 250MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,293
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Product details
Overview
MMBD4448HW from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in SOT-323 package, rated for 80 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time, with 3.5 pF junction capacitance at 6 V - used in high-speed signal routing and clamping circuits in telecom line interface and USB data line protection.
For engineers reviewing the MMBD4448HW datasheet, MMBD4448HW pinout, MMBD4448HW application, or MMBD4448HW equivalent, key selection criteria include reverse recovery time, forward voltage at 10 mA, peak reverse voltage rating, junction capacitance at 6 V, and thermal resistance (625 °C/W) under FR-4 PCB mounting conditions.
Technical Context
This diode employs a planar epitaxial construction optimized for low charge storage and rapid carrier recombination, enabling sub-4 ns reverse recovery. Its low 3.5 pF capacitance at 6 V reverse bias supports high-frequency signal integrity in 50–100 MHz switching paths.
The device operates across –55 °C to +150 °C and delivers 0.72 V forward voltage at 10 mA, with leakage limited to 100 nA at 70 V reverse bias - making it suitable for low-power logic-level clamping and sampling gate applications where minimal loading and fast turn-off are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 80 V - maximum repetitive reverse voltage before breakdown; defines safe DC/AC blocking capability in signal path isolation |
| IFM | 500 mA - continuous forward current limit; sets max steady-state conduction without thermal runaway on standard FR-4 layout |
| trr | 4.0 ns - reverse recovery time at VR = 6 V, IF = 5 mA; enables reliable operation up to ~80 MHz switching frequency |
| CT | 3.5 pF - junction capacitance at VR = 6 V, f = 1 MHz; ensures minimal signal distortion in RF and high-speed digital interfaces |
| RθJA | 625 °C/W - thermal resistance junction-to-ambient on FR-4 with 1-inch² 2 oz copper pad; determines derating slope above 25 °C ambient |
| VF @ 10 mA | 0.72 V - forward voltage drop at 10 mA; impacts logic-level compatibility and power loss in clamping networks |
| IR @ 70 V | 100 nA - peak reverse leakage at 70 V and 25 °C; critical for low-current sample-and-hold and precision analog switch hold states |
Pinout & Package
Package: SOT-323 - ultra-small surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), lead-free, halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node during conduction; polarity marked by cathode band on package top view |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Connected to lower-potential node; carries full reverse voltage when anode is biased negative relative to cathode |
| Collector / Heat Sink (Pin 3) | Thermal and mechanical anchor | Exposed leadframe tab (center pin) tied to cathode internally; provides primary thermal path to PCB copper pad |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4.0 ns trr enables use in >50 MHz clocked sample-and-hold and pulse shaping circuits without tail distortion |
| Low junction capacitance | 3.5 pF at 6 V allows integration into 100 Mbps+ data line ESD clamps without signal edge degradation |
| High conductance | 0.72 V VF at 10 mA yields <1 Ω dynamic on-resistance, minimizing insertion loss in RF switch legs |
| SOT-323 packaging | 0.006 g mass and 2.15 mm × 2.10 mm footprint support high-density routing in space-constrained IoT sensor modules |
Applications
| Telecom Line Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Bidirectional signal clamping on T1/E1 line driver outputs to prevent overvoltage transients from damaging downstream PHY ICs. IC Role / Device Role / Timing Role: Fast-switching clamp diode placed between differential pair and ground/VCC rails to shunt ESD and lightning-induced surges. Use Value: 4.0 ns trr ensures clamping action completes before transient energy couples into sensitive receiver inputs; 3.5 pF avoids signal integrity loss at 2.048 MHz framing rate. | Use Scenario: I/O port protection on host controller USB D+ and D− lines against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance steering diode in rail-to-rail TVS configuration, diverting surge current to VBUS or GND. Use Value: 3.5 pF CT preserves 480 Mbps full-speed USB eye diagram margin; 80 V VRRM withstands VBUS fault conditions up to 5.5 V + margin. |
| Sample-and-Hold Circuit | Logic-Level Translation Interface |
Use Scenario: Sampling gate in precision ADC front-end, where diode conducts only during aperture window to charge hold capacitor. IC Role / Device Role / Timing Role: High-speed switch controlling analog signal path enable; turned on/off by CMOS control signal. Use Value: 4.0 ns trr limits aperture uncertainty to <1% of 500 ns sampling period; 100 nA IR prevents capacitor discharge during 10 μs hold time. | Use Scenario: Level-shifting interface between 3.3 V microcontroller GPIO and 5 V peripheral bus lines with open-drain pull-up. IC Role / Device Role / Timing Role: Unidirectional logic translator using forward conduction to pass high state, reverse blocking to isolate low state. Use Value: 0.72 V VF at 10 mA ensures clean 3.3 V → 5 V high-level transfer; 80 V VRRM blocks 5 V rail during low-state isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54CWT1G | Lower VRRM (30 V), higher CT (10 pF), same SOT-323 package | Not suitable for 70 V clamping or >25 MHz signal paths | Select only for ≤3.3 V logic-level translation where capacitance and voltage rating are relaxed |
| 1N4148W-7-F | Higher trr (4 ns typical but 8 ns max), same VRRM (100 V), SOD-123 package (larger footprint) | Slower worst-case recovery may cause timing skew in >40 MHz sampling gates | Prefer when board space allows larger package and tighter VRRM margin is needed over speed consistency |
Compared with BAT54CWT1G and 1N4148W-7-F, the MMBD4448HW uniquely balances 4.0 ns trr, 80 V VRRM, and 3.5 pF CT in SOT-323 - making it optimal for high-density, high-frequency clamping where both speed and voltage headroom are constrained.
Availability
MMBD4448HW is available at Aetrix Electronics and suitable for telecom line interface, USB 2.0 data line protection, sample-and-hold circuitry, and logic-level translation interfaces requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBD4448HW 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 MMBD4448HW belongs to Diodes' general-purpose high-speed switching diode product line, engineered specifically for compact, high-frequency signal routing and transient suppression in consumer, computing, and industrial electronics.
FAQ
What is the maximum operating temperature for MMBD4448HW?
The MMBD4448HW has an operating junction temperature range of –55 °C to +150 °C. Its thermal resistance is 625 °C/W on FR-4 with a 1-inch² 2 oz copper pad, so at 25 °C ambient and 100 mW dissipation, junction temperature rises to 87.5 °C - well within safe limits. Derating begins linearly above 25 °C per Figure 1.
Is MMBD4448HW qualified for automotive applications?
The MMBD4448HW is not AEC-Q101 qualified out-of-the-box. Diodes offers automotive-grade variants (e.g., MMBD4448HWQ-7-F) with PPAP documentation, IATF 16949 manufacturing, and extended test coverage. Standard MMBD4448HW is intended for industrial and commercial use unless explicitly specified as Q-grade in the orderable part number.
How does the SOT-323 package affect thermal performance?
The SOT-323 package uses a thermally enhanced leadframe with Pin 3 (cathode tab) acting as the primary heat path. On FR-4 with 1-inch² 2 oz copper, RθJA is 625 °C/W. Adding thermal vias under the tab reduces RθJA by ~20–30%, but the small size inherently limits power handling to ≤200 mW continuous under standard conditions.
Can MMBD4448HW replace 1N4148 in high-speed designs?
Yes - with qualification. The MMBD4448HW matches or exceeds 1N4148 in trr (4.0 ns vs. 4 ns typ / 8 ns max), VF (0.72 V @ 10 mA vs. 0.75 V), and CT (3.5 pF vs. 4 pF), while offering SOT-323's smaller footprint. However, its 80 V VRRM is lower than 1N4148's 100 V, so verify reverse voltage margin in the target circuit before substitution.
MMBD4448HW-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):
- 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-323
- Operating Temperature - Junction:
- -65°C ~ 150°C
MMBD4448HW-7 FAQ
1.How can I place an order for MMBD4448HW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBD4448HW-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 MMBD4448HW-7 reliable?
The price and inventory of MMBD4448HW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBD4448HW-7 is usually 5 days.
3.What payment methods are accepted for MMBD4448HW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBD4448HW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBD4448HW-7?
MMBD4448HW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBD4448HW-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 MMBD4448HW-7?
For technical support, including MMBD4448HW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBD4448HW-7 requirements.
6.How does Aetrix verify that MMBD4448HW-7 is sourced from the original manufacturer or authorized distributors?
All MMBD4448HW-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 MMBD4448HW-7 meets industry standards.
7.What is the process for return or replacement of MMBD4448HW-7?
All MMBD4448HW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBD4448HW-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 MMBD4448HW-7 part is unused and in its original packaging.
Return procedure for MMBD4448HW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBD4448HW-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
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BAS16LT1G
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MMSD914T1G
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BAV21W-7-F
Diodes Incorporated
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