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Diodes Incorporated MMBT3904FZ-7B
- Part No.:
- MMBT3904FZ-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-XFDFN
- Datasheet:
-
MMBT3904FZ-7B.pdf
- Description:
- TRANS NPN 40V 0.2A X2-DFN0606-3
- Quantity:
- Payment:
- Shipping:
Inventory:23,935
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Product details
Overview
MMBT3904FZ-7B from Diodes Incorporated is a 40V NPN small-signal transistor in X2-DFN0606-3 package, rated for 200mA continuous collector current, 925mW power dissipation (with 2oz copper heatsink), and featuring 300MHz fT. It serves as a general-purpose switching and amplification device in space-constrained DC-DC converters, LED drivers, and load interface circuits.
For engineers reviewing the MMBT3904FZ-7B datasheet, MMBT3904FZ-7B pinout, MMBT3904FZ-7B application, or MMBT3904FZ-7B equivalent, key selection criteria include VCEO = 40V, hFE = 40–300 (IC = 100µA to 100mA), VCE(sat) ≤ 0.30V at IC = 50mA/IB = 5mA, and thermal resistance RθJL = 135°C/W for board-level thermal design.
Technical Context
This NPN transistor operates in active, saturation, and cutoff regions with guaranteed BVCEO ≥ 40V and BVCBO ≥ 60V. Its low-profile 0.4mm height and 0.36mm² footprint enable high-density placement in portable and wearable electronics where board real estate is constrained.
Thermal performance is defined by two distinct conditions: RθJA = 465°C/W (minimum copper) and 135°C/W (junction-to-lead), reflecting direct thermal path to the exposed collector pad. ESD ratings meet JEDEC Class 3A HBM (4kV) and Class B MM (200V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum allowable collector-emitter voltage before breakdown; sets upper limit for switch voltage rails. |
| IC (continuous) | 200 mA - Sustained collector current capability; supports medium-current logic interfacing and driver stages. |
| PD (2oz Cu) | 925 mW - Power handling with optimized PCB thermal pad; enables higher duty-cycle operation than standard DFN1006. |
| fT | 300 MHz - Transition frequency; confirms suitability for audio-frequency amplification and fast digital switching (tr/tf ≤ 35 ns). |
| VCE(sat) | ≤ 0.30 V @ IC = 50mA, IB = 5mA - Low saturation voltage reduces conduction loss in switching applications. |
| hFE | 40–300 - Wide DC current gain range across 100µA–100mA; accommodates biasing flexibility in analog and digital modes. |
| RθJL | 135 °C/W - Junction-to-lead thermal resistance; enables accurate thermal modeling using the exposed collector pad as primary heat path. |
Pinout & Package
Package: X2-DFN0606-3 - 0.6mm × 0.6mm, 0.4mm max height, molded green compound (UL 94V-0), NiPdAu-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (exposed pad) | Main current output terminal and thermal path | Exposed metal pad functions as both collector connection and primary heat sink interface; must be soldered to ≥25mm² 2oz copper for rated 925mW dissipation. |
| Base | Control input for current amplification | Center pin on top side; requires current-limited drive (e.g., 5–10% of IC) to ensure saturation in switching mode. |
| Emitter | Current return path and reference node | Right-side pin adjacent to bar marking; tied to ground or low-side reference in common-emitter configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | 0.36 mm² area - 40% smaller than DFN1006, enabling >2× component density in compact power management modules. |
| Enhanced thermal performance | RθJL = 135°C/W - Direct junction-to-pad conduction allows predictable thermal design without reliance on PCB plane conduction alone. |
| High ESD robustness | 4 kV HBM - Reduces need for external protection in handheld and industrial I/O interfaces subject to user handling. |
| Green compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - Meets IPC-1752A Tier 1 reporting and automotive ELV requirements. |
Applications
| Portable LED Backlight Control | USB-C Load Switch Interface |
|---|---|
Use Scenario: Driving white LEDs in smartphone display backlight circuits with PWM dimming at 1–10kHz. IC Role / Device Role / Timing Role: NPN switch controlling LED cathode current path; operates in saturation/cutoff with <35ns rise/fall times. Use Value: Low VCE(sat) (≤0.20V @ 10mA) minimizes power loss and thermal rise in thin-bezel designs. |
Use Scenario: Enabling/disabling 5V power rail to USB-C peripheral ports under system controller command. IC Role / Device Role / Timing Role: Low-side load switch controlled by microcontroller GPIO; handles up to 200mA steady-state load. Use Value: Guaranteed hFE ≥ 60 at IC = 100mA ensures reliable saturation with 1.6mA base drive, reducing MCU pin loading. |
| Automotive Cabin Sensor Signal Conditioning | Industrial PLC Digital Input Buffer |
Use Scenario: Amplifying low-level signals from thermistors and Hall-effect sensors in dashboard control units. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with DC-coupled bias; operates over –40°C to +125°C ambient. Use Value: Stable hFE variation (±25%) across temperature ensures consistent gain calibration without software compensation. |
Use Scenario: Level-shifting and isolating 24V industrial field signals to 3.3V/5V logic inputs in programmable logic controllers. IC Role / Device Role / Timing Role: Discrete transistor buffer with base resistor network; provides galvanic separation and noise immunity. Use Value: 40V VCEO rating safely clamps transients up to ±30V, eliminating need for additional TVS diodes in DIN-rail mounted I/O modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN3020LSD-13 | 30V VDS, MOSFET (not bipolar); RDS(on) = 35mΩ @ VGS = 10V | Requires gate-drive voltage >4.5V; unsuitable for low-voltage base drive or linear amplification | Select only when replacing with voltage-controlled switching and gate-compatible logic levels exist. |
| BC846BW,115 | 65V VCEO, SOT-323 package (1.3mm × 1.3mm), RθJA = 300°C/W (min Cu) | Larger footprint and higher thermal resistance limit power handling in ultra-thin assemblies | Prefer when higher voltage margin is critical and board space permits larger package. |
Compared with DMN3020LSD-13 and BC846BW,115, the MMBT3904FZ-7B uniquely balances 40V rating, 0.36mm² size, and 135°C/W junction-to-lead thermal resistance-making it optimal for space- and thermally constrained NPN switching where bipolar drive simplicity is required.
Availability
MMBT3904FZ-7B is available at Aetrix Electronics and suitable for portable LED drivers, USB-C load switches, automotive sensor interfaces, and industrial PLC input buffers requiring stable component supply and long-term manufacturability.
Supply support for MMBT3904FZ-7B 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-reliability components for power management, signal integrity, and protection applications.
The MMBT3904FZ belongs to Diodes' "FZ" series of ultra-compact DFN transistors, engineered specifically for miniaturized consumer, computing, and automotive electronics where thermal efficiency and board-area savings are critical.
FAQ
What is the maximum safe operating temperature for MMBT3904FZ-7B?
The device has an operating junction temperature range of –55°C to +150°C. When mounted on 25mm × 25mm 2oz copper, its 925mW power rating is valid up to +85°C ambient; derating begins linearly above that point at 7.3mW/°C, reaching zero dissipation at +150°C junction temperature.
Is MMBT3904FZ-7B pin-compatible with legacy SOT-23 NPN transistors?
No-it uses a 3-pin DFN0606 footprint (X2-DFN0606-3) with collector on the exposed pad, not a leaded SOT-23 outline. Pin mapping differs: Base and Emitter occupy top-side terminals, while Collector connects solely through the bottom-side thermal pad. PCB layout must follow AP02001 recommended pad dimensions.
Does MMBT3904FZ-7B support linear (analog) amplification?
Yes-its hFE is specified from 100µA to 100mA with typical values of 100–300 at VCE = 1.0V, and fT = 300MHz supports audio-band amplification. However, thermal stability in linear mode requires careful attention to RθJL and heatsinking due to the DFN package's limited lateral conduction.
How does the "FZ" suffix distinguish this part from standard MMBT3904 variants?
The "FZ" denotes Diodes' proprietary ultra-miniature DFN0606 package (0.6mm × 0.6mm), whereas standard MMBT3904 parts use SOT-23 or SC-70. FZ versions offer 40% smaller area, 0.4mm profile, and optimized thermal path via exposed collector pad-enabling next-generation miniaturization not possible with legacy packages.
MMBT3904FZ-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-XFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 10V
- Power - Max:
- 435 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN0606-3
MMBT3904FZ-7B FAQ
1.How can I place an order for MMBT3904FZ-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT3904FZ-7B 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 MMBT3904FZ-7B reliable?
The price and inventory of MMBT3904FZ-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3904FZ-7B is usually 5 days.
3.What payment methods are accepted for MMBT3904FZ-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3904FZ-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT3904FZ-7B?
MMBT3904FZ-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT3904FZ-7B 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 MMBT3904FZ-7B?
For technical support, including MMBT3904FZ-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3904FZ-7B requirements.
6.How does Aetrix verify that MMBT3904FZ-7B is sourced from the original manufacturer or authorized distributors?
All MMBT3904FZ-7B 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 MMBT3904FZ-7B meets industry standards.
7.What is the process for return or replacement of MMBT3904FZ-7B?
All MMBT3904FZ-7B units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3904FZ-7B, 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 MMBT3904FZ-7B part is unused and in its original packaging.
Return procedure for MMBT3904FZ-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBT3904FZ-7B Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
onsemi
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