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Diodes Incorporated MMBT3904T-7-F
- Part No.:
- MMBT3904T-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SOT-523
- Datasheet:
-
MMBT3904T-7-F.pdf
- Description:
- TRANS NPN 40V 0.2A SOT-523
- Quantity:
- Payment:
- Shipping:
Inventory:613,474
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Product details
Overview
MMBT3904T-7-F from Diodes Incorporated is an NPN small-signal transistor in SOT523 package, rated for 40 V VCEO, 200 mA IC, and 150 mW power dissipation, with DC current gain (hFE) ranging from 40 to 300 depending on operating conditions. It serves as a general-purpose switching and amplification device in low-power analog and digital circuits.
For engineers reviewing the MMBT3904T-7-F datasheet, MMBT3904T-7-F pinout, MMBT3904T-7-F application, or MMBT3904T-7-F equivalent, key selection criteria include its AEC-Q101 qualification, ultra-small SOT523 footprint, 4 kV HBM ESD rating, and complementary pairing with MMBT3906T for push-pull designs.
Technical Context
This NPN bipolar junction transistor uses epitaxial planar die construction for stable gain and low leakage. Its 60 V VCBO, 40 V VCEO, and 6 V VEBO define safe operating voltage boundaries across all junctions under specified test conditions.
Switching performance is characterized by tD/tR/tS/tF ≤ 35/35/200/50 ns at VCC = 3 V, IC = 10 mA, enabling use in medium-speed digital logic interfaces and pulse amplification stages where compact size and reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum collector-emitter voltage before breakdown under open-base condition; sets upper limit for supply rail compatibility in low-voltage switching. |
| IC | 200 mA - Continuous collector current rating; defines maximum load drive capability in saturated switch operation. |
| PD | 150 mW - Steady-state power dissipation on FR4 PCB with minimum pad layout; constrains thermal design in high-duty-cycle applications. |
| hFE | 40–300 - DC current gain range across IC = 100 µA to 100 mA; enables predictable base drive sizing for both low- and medium-current gain modes. |
| fT | 300 MHz - Current gain-bandwidth product; supports RF amplifier and oscillator use up to ~100 MHz with adequate gain margin. |
| ESD HBM | 4,000 V - Human Body Model rating per JEDEC JESD22-A114; ensures robustness during manual handling and board-level assembly. |
Pinout & Package
Package: SOT523 - ultra-small surface-mount plastic package measuring 1.60 mm × 0.80 mm × 0.50 mm (L × W × H), with matte tin-plated leads solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for base-emitter junction; connects to ground or low-side return path in common-emitter configurations. |
| 2 (Base) | Control input | Current-controlled gate for transistor conduction; requires precise IB calculation based on hFE and target IC. |
| 3 (Collector) | Output terminal | High-side connection point for load; carries full IC and must be routed with appropriate trace width and thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Ultra-small SOT523 footprint | Reduces PCB area by >50% vs. SOT23; enables high-density routing in space-constrained modules like sensor nodes and wearables. |
| Complementary PNP pair (MMBT3906T) | Enables matched push-pull output stages without cross-manufacturer parametric mismatch or thermal drift asymmetry. |
| Halogen- and antimony-free "Green" construction | Meets strict environmental compliance: <900 ppm Br, <900 ppm Cl, <1000 ppm Sb; suitable for EU and global eco-design mandates. |
Applications
| Automotive Cabin Sensors | USB-C Power Path Control |
|---|---|
Use Scenario: Signal conditioning and level-shifting in occupancy detection, ambient light, and temperature sensing modules inside vehicle cabins. IC Role / Device Role / Timing Role: NPN switch driving op-amp bias networks and pull-up/pull-down functions for I²C-compatible sensors. Use Value: AEC-Q101 qualification ensures operational stability over -40°C to +125°C ambient, while low leakage (<50 nA ICEX) preserves battery life in always-on monitoring. | Use Scenario: Enabling/disabling VBUS power delivery paths in USB-C port controllers and PD sink implementations. IC Role / Device Role / Timing Role: Low-side switch controlling gate of external MOSFET or directly sourcing/sinking control logic signals. Use Value: Fast switching (tS ≤ 200 ns) and low VCE(SAT) (0.20 V @ 10 mA) minimize power loss and response latency during dynamic power negotiation. |
| Industrial IoT Edge Node | Medical Diagnostic Instrumentation |
Use Scenario: Isolated signal buffering between microcontroller GPIOs and external transducers in battery-powered field devices. IC Role / Device Role / Timing Role: General-purpose amplifier and digital buffer stage interfacing MCU peripherals with analog front-end components. Use Value: High fT (300 MHz) and consistent hFE across temperature support accurate analog gain staging and noise-sensitive signal integrity. | Use Scenario: Precision current source control in portable blood glucose meters and handheld ECG front-ends. IC Role / Device Role / Timing Role: Constant-current driver for LED-based optical sensing or photodiode biasing circuits. Use Value: Tight VBE(SAT) tolerance (0.65–0.95 V) and low parameter drift enable sub-1% current regulation accuracy without trimming. |
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 SOT323 package; slightly higher hFE min (110 @ IC = 10 mA); no AEC-Q101 rating. | Not qualified for automotive; suitable for commercial-grade consumer electronics only. | Select when AEC-Q101 is not required and higher gain consistency at mid-current is prioritized. |
| PN2222A-AP (Micro Commercial) | TO-92 through-hole package; higher PD (625 mW); larger footprint and lower fT (250 MHz). | Requires PCB rework for through-hole assembly; unsuitable for ultra-dense layouts. | Choose only for prototyping or legacy through-hole systems where thermal headroom outweighs size constraints. |
Compared with BC847BW and PN2222A-AP, MMBT3904T-7-F uniquely combines AEC-Q101 qualification, SOT523 miniaturization, and 4 kV HBM ESD protection-making it optimal for next-generation automotive and portable medical edge devices requiring reliability and space efficiency.
Availability
MMBT3904T-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, USB-C power path control, industrial IoT edge nodes, and medical diagnostic instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMBT3904T-7-F 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 MMBT3904T belongs to Diodes' AEC-Q101-qualified small-signal transistor family, engineered for reliable switching and amplification in automotive, industrial, and portable medical applications where miniaturization and environmental robustness are essential.
FAQ
What is the maximum continuous collector current for MMBT3904T-7-F?
The absolute maximum continuous collector current (IC) is 200 mA at TA = +25°C. Derating applies above 25°C ambient per the power derating curve in Figure 1 of DS30270 Rev. 10–2; at 85°C, usable IC drops to approximately 120 mA due to thermal limits imposed by the 150 mW PD rating and 833°C/W RθJA.
Is MMBT3904T-7-F compatible with lead-free reflow processes?
Yes. The device uses matte tin-plated leads compliant with IPC-J-STD-020 moisture sensitivity Level 1 and is fully RoHS-compliant with no purposely added lead. It supports standard Pb-free reflow profiles up to peak temperatures of 260°C, provided the recommended SOT523 pad layout from Diodes' package outline documentation is followed.
How does the hFE variation affect base resistor selection?
hFE ranges from 40 at IC = 100 µA to 300 at IC = 100 mA. For saturation switching, design for worst-case hFE = 40 at target IC to ensure sufficient base drive; for linear amplification, use typical hFE = 100–200 and include emitter degeneration to stabilize gain against process variation.
Can MMBT3904T-7-F replace older TO-92 versions like PN2222A in new designs?
No direct drop-in replacement due to different package (SOT523 vs. TO-92), pinout (Emitter-Base-Collector vs. Emitter-Collector-Base), and thermal characteristics. While electrically similar, PCB layout, thermal management, and assembly process must be redesigned; use only when miniaturization and AEC-Q101 compliance are primary requirements.
MMBT3904T-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- 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:
- 150 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-523
MMBT3904T-7-F FAQ
1.How can I place an order for MMBT3904T-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT3904T-7-F 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 MMBT3904T-7-F reliable?
The price and inventory of MMBT3904T-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3904T-7-F is usually 5 days.
3.What payment methods are accepted for MMBT3904T-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3904T-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT3904T-7-F?
MMBT3904T-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT3904T-7-F 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 MMBT3904T-7-F?
For technical support, including MMBT3904T-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3904T-7-F requirements.
6.How does Aetrix verify that MMBT3904T-7-F is sourced from the original manufacturer or authorized distributors?
All MMBT3904T-7-F 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 MMBT3904T-7-F meets industry standards.
7.What is the process for return or replacement of MMBT3904T-7-F?
All MMBT3904T-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3904T-7-F, 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 MMBT3904T-7-F part is unused and in its original packaging.
Return procedure for MMBT3904T-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBT3904T-7-F Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
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