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Diodes Incorporated MMBT3904FA-7B
- Part No.:
- MMBT3904FA-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-XFDFN
- Datasheet:
-
MMBT3904FA-7B.pdf
- Description:
- TRANS NPN 40V 0.2A X2-DFN0806-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,256
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Product details
Overview
MMBT3904FA-7B from Diodes Incorporated is a 40V NPN small-signal transistor in X2-DFN0806-3 package, rated for 200mA continuous collector current, 435mW power dissipation, and 300MHz current gain-bandwidth product (fT). It serves as a general-purpose switching and amplification device in space-constrained DC-DC feedback paths, LED drivers, and logic-level interface circuits.
For engineers reviewing the MMBT3904FA-7B datasheet, MMBT3904FA-7B pinout, MMBT3904FA-7B application, or MMBT3904FA-7B equivalent, key selection criteria include its 0.48mm² footprint (16× smaller than SOT-23), 0.4mm profile, JEDEC-qualified reliability, and complementary PNP pairing with MMBT3906FA.
Technical Context
This NPN bipolar junction transistor operates in active, saturation, and cutoff regions with verified DC current gain (hFE) ranging from 40 to 300 across 100µA–100mA collector currents at VCE = 1.0V. Its low VCE(sat) (≤0.30V at IC = 50mA/IB = 5mA) and fast switching (td/tr/tf ≤ 35/35/50ns) support high-efficiency digital signal routing and pulse-width modulation control.
The device uses an exposed-collector thermal pad in the X2-DFN0806-3 package, achieving RθJL = 150°C/W and enabling stable operation from –55°C to +150°C. Its 4kV HBM ESD rating and AEC-Q101-qualified process ensure robustness in automotive infotainment and industrial sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40V - Maximum safe collector-emitter voltage before breakdown; enables use in 24V industrial bus interfaces. |
| IC (continuous) | 200mA - Sustained current-handling capability for driving small relays or MOSFET gates without derating at 25°C. |
| PD | 435mW - Power dissipation limit on standard 1oz FR4 PCB; defines thermal headroom for compact layout. |
| fT | 300MHz - Current gain-bandwidth product; supports RF pre-amplification up to UHF band in low-noise receivers. |
| VCE(sat) | ≤0.30V @ IC=50mA/IB=5mA - Low saturation voltage minimizes conduction loss in high-duty-cycle switching. |
| ESD HBM | 4,000V - Human Body Model rating ensures handling survivability during manual assembly and board rework. |
| RθJL | 150°C/W - Junction-to-lead thermal resistance via exposed collector pad; enables direct thermal coupling to PCB copper pour. |
Pinout & Package
Package: X2-DFN0806-3 - 0.8mm × 0.6mm, 0.4mm height, molded green plastic with NiPdAu-plated terminals and exposed collector thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Top View, left) | Emitter (E) | Current sink node; connected to ground or low-side return path in common-emitter configurations. |
| 2 (Top View, center) | Base (B) | Control input; requires ~1mA drive for 50mA collector switching; sensitive to ESD due to thin oxide. |
| 3 (Top View, right) | Collector (C) | Current source node; electrically and thermally tied to exposed metal pad on bottom surface for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | 0.48mm² area - reduces PCB real estate by 94% vs. SOT-23, critical for wearable and IoT edge nodes. |
| Low-profile package | 0.4mm max height - enables stacking under connectors or beneath shields in ultra-thin modules. |
| JEDEC-qualified reliability | Qualified per AEC-Q101 - validated for automotive-grade temperature cycling, humidity, and mechanical shock. |
| Complementary PNP pair | MMBT3906FA - matched parametric behavior enables balanced push-pull output stages and differential amplifiers. |
| Green material system | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets IPC-1752A reporting and RoHS 3 compliance. |
Applications
| Automotive Cabin Sensors | Industrial PLC Input Conditioning |
|---|---|
Use Scenario: Signal conditioning for capacitive touch sensors and MEMS accelerometers in dashboard control modules. IC Role / Device Role / Timing Role: NPN switch amplifying weak analog sensor outputs into clean digital logic levels for MCU GPIOs. Use Value: 300MHz fT preserves signal integrity up to 100kHz sensor bandwidth; 4kV HBM prevents field failure during service. |
Use Scenario: Isolating 24V field inputs (e.g., limit switches, proximity sensors) to 3.3V/5V logic domains in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting interface transistor with fast turn-off (tf ≤ 50ns) to meet IEC 61131-2 response time requirements. Use Value: VCEO = 40V withstands transients on industrial buses; RθJL = 150°C/W sustains 85°C ambient without heatsink. |
| USB-C Port Power Switching | Smart Home LED Driver Feedback |
Use Scenario: Controlling USB-C VCONN power delivery and CC line pull-up/down in portable docking stations. IC Role / Device Role / Timing Role: Low-voltage, low-current switching element managing bidirectional CC communication signaling. Use Value: 0.4mm height avoids interference with USB-C connector mating; 200mA IC safely handles 500mA VCONN loads with margin. |
Use Scenario: Secondary-side current sensing and error amplification in isolated flyback LED drivers for tunable white fixtures. IC Role / Device Role / Timing Role: Transconductance amplifier converting optocoupler output into precise reference voltage for PWM controller feedback. Use Value: hFE = 100–300 at 1–10mA ensures stable loop gain across temperature; 435mW PD accommodates 100% dimming duty cycle. |
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 |
|---|---|---|---|
| BC847BW,115 (Nexperia) | Same X2-DFN0806-3 package; lower fT (100MHz); higher hFE min (110 @ IC=10mA). | Limited to ≤50MHz switching; better for DC-coupled amplification where gain stability > bandwidth. | Select when precision DC gain matters more than RF performance or when sourcing from alternate supply chain. |
| DMN3028LFG-7 (Diodes Inc.) | Same manufacturer; MOSFET not BJT; 30V VDS, 2.8A ID; gate-driven, no base current. | Replaces BJT only in high-current (>200mA), low-VGS logic-level switching; incompatible for linear amplification. | Choose only for load-switching upgrades requiring zero base drive loss and higher current capacity. |
Compared with BC847BW and DMN3028LFG-7, the MMBT3904FA-7B uniquely balances RF-ready bandwidth (300MHz), ultra-compact size, and proven BJT linearity-making it optimal for mixed-signal feedback loops where both speed and analog fidelity are required.
Availability
MMBT3904FA-7B is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial PLC input modules, and smart home LED driver designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant traceability.
Supply support for MMBT3904FA-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q standards.
This part belongs to Diodes' X2-DFN family of ultra-miniature transistors, engineered specifically for space-constrained, high-reliability applications in automotive, industrial, and consumer electronics where thermal efficiency and PCB area reduction are critical.
FAQ
What is the maximum operating temperature for MMBT3904FA-7B?
The MMBT3904FA-7B is rated for junction and storage temperatures from –55°C to +150°C. Its thermal design relies on the exposed collector pad; when mounted on a 1oz copper pad per recommended layout, it maintains safe operation up to +125°C ambient with full 200mA current.
Is MMBT3904FA-7B pin-compatible with standard SOT-23 transistors?
No-it uses the X2-DFN0806-3 package with three terminals in a 0.8mm × 0.6mm footprint and no leads, unlike SOT-23's 3-pin through-hole or gull-wing configuration. PCB layout and stencil design must follow Diodes' suggested pad dimensions (D1=0.40mm, E1=0.25mm) for reliable solder joint formation.
Does MMBT3904FA-7B support automotive qualification?
The base MMBT3904FA-7B is JEDEC-qualified and built in IATF 16949-certified facilities, but it carries no AEC-Q101 suffix. For automotive applications requiring PPAP documentation and full AEC-Q101 stress testing, specify the Q-suffix variant (e.g., MMBT3904FAQ-7B) listed in Diodes' automotive product portal.
How does the exposed collector pad affect thermal performance?
The exposed collector pad on the underside of the X2-DFN0806-3 package provides a direct thermal path to the PCB. With proper copper pour connection, it achieves RθJL = 150°C/W-over 40% lower than RθJA = 287°C/W-enabling higher sustained power in thermally dense layouts without external heatsinks.
MMBT3904FA-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, 1V
- 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-DFN0806-3
MMBT3904FA-7B FAQ
1.How can I place an order for MMBT3904FA-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT3904FA-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 MMBT3904FA-7B reliable?
The price and inventory of MMBT3904FA-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3904FA-7B is usually 5 days.
3.What payment methods are accepted for MMBT3904FA-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3904FA-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT3904FA-7B?
MMBT3904FA-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT3904FA-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 MMBT3904FA-7B?
For technical support, including MMBT3904FA-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3904FA-7B requirements.
6.How does Aetrix verify that MMBT3904FA-7B is sourced from the original manufacturer or authorized distributors?
All MMBT3904FA-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 MMBT3904FA-7B meets industry standards.
7.What is the process for return or replacement of MMBT3904FA-7B?
All MMBT3904FA-7B units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3904FA-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 MMBT3904FA-7B part is unused and in its original packaging.
Return procedure for MMBT3904FA-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBT3904FA-7B Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
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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
-
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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