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Diodes Incorporated MMBT3904Q-7-F
- Part No.:
- MMBT3904Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBT3904Q-7-F.pdf
- Description:
- TRANS NPN 40V 0.2A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,481
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Product details
Overview
MMBT3904Q-7-F from Diodes Incorporated is an AEC-Q101 qualified 40 V NPN small-signal transistor in SOT23 package, with hFE = 40–300 (IC = 100 µA to 100 mA), VCE(sat) ≤ 0.30 V at IC = 50 mA/IB = 5 mA, and fT = 300 MHz - deployed in automotive body control modules for load switching and signal amplification.
For engineers reviewing the MMBT3904Q-7-F datasheet, MMBT3904Q-7-F pinout, MMBT3904Q-7-F application, or MMBT3904Q-7-F equivalent, key selection criteria include AEC-Q101 qualification status, SOT23 thermal resistance (RθJA = 357 °C/W on 15 mm × 15 mm copper), and guaranteed hFE minima across five collector current test points.
Technical Context
This NPN BJT operates in linear amplification and saturated switching modes, supporting DC current gain (hFE) ranging from 40 at 100 µA to 300 at 10 mA, with VBE(sat) = 0.65–0.95 V and VCE(sat) = 0.20–0.30 V under defined drive conditions. Its 300 MHz fT enables RF-coupled pre-amplifier stages up to low-VHF bands.
Designed for automotive-grade reliability, it features 4 kV HBM ESD rating, -55°C to +150°C operating range, and IATF16949-certified manufacturing. Thermal derating begins at 25°C ambient, with power dissipation dropping linearly to zero at 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum continuous collector-emitter voltage before breakdown; sets safe operating limit for 12 V/24 V automotive supply rail switching. |
| hFE (IC = 10 mA) | 60–300 - Confirmed DC current gain range at mid-current bias; ensures stable base drive sizing for relay or LED driver circuits. |
| VCE(sat) | ≤ 0.30 V @ IC = 50 mA / IB = 5 mA - Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching. |
| fT | 300 MHz - Unity-gain frequency enabling use in low-noise preamps and oscillator buffer stages up to ~100 MHz. |
| RθJA | 357 °C/W - Measured on 15 mm × 15 mm 1 oz copper PCB; defines thermal rise per watt dissipated in standard layout. |
| ESD HBM | 4,000 V - JEDEC Class 3A rating supports robust handling during automated assembly and in-vehicle ESD events. |
Pinout & Package
Package: SOT23 - Surface-mount plastic package with 3-pin configuration, 0.008 g mass, UL 94V-0 flammability rating, and matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; determines polarity of bias network and current flow direction. |
| 2 (Base) | Control input | Receives forward-biased current to enable conduction; requires series resistor to limit IB and ensure hFE-dependent saturation. |
| 3 (Collector) | Current source terminal | Drives load toward positive rail; must be rated for VCEO and peak IC in target application (e.g., solenoid, fan, indicator LED). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD - required for under-hood and chassis applications. |
| IATF16949 manufacturing | Produced in certified facilities with PPAP capability - ensures traceable lot control, change management, and production part approval for OEMs. |
| SOT23 thermal performance | RθJL = 350 °C/W - Enables efficient heat transfer from junction to PCB pads, critical for sustained 200 mA operation without forced cooling. |
| Green compound & RoHS compliance | Halogen-free (<900 ppm Br+Cl), antimony-free (<1000 ppm), lead-free - meets EU Directive 2015/863/EU and automotive ELV requirements. |
Applications
| Automotive Door Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Driving window lift motor relays and door lock actuators in 12 V systems. IC Role / Device Role / Timing Role: NPN switch controlling coil current path with fast turn-off (tf = 50 ns) to prevent contact arcing. Use Value: VCE(sat) ≤ 0.30 V reduces power loss to <15 mW at 50 mA, minimizing thermal stress in sealed module enclosures. |
Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor, pressure transducer) into MCU ADC inputs. IC Role / Device Role / Timing Role: Common-emitter amplifier with hFE ≥ 100 at 1 mA bias, providing gain stability over -40°C to +85°C. Use Value: fT = 300 MHz and NF ≤ 5.0 dB support clean signal conditioning up to 10 kHz bandwidth without added noise floor degradation. |
| LED Lighting Control | Power Supply Enable Circuit |
Use Scenario: PWM-driven current sink for interior map lights and dashboard indicators in vehicle cabins. IC Role / Device Role / Timing Role: Saturated switch toggling at 1–10 kHz with tr/tf ≤ 35 ns to minimize transition losses. Use Value: RθJA = 357 °C/W allows continuous 100 mA operation on standard FR4 without heatsinking, reducing BOM cost. |
Use Scenario: Enabling/disabling secondary DC-DC converter rails in infotainment head units based on MCU GPIO. IC Role / Device Role / Timing Role: High-side or low-side enable switch with guaranteed hFE ≥ 40 at 100 µA base drive - supports ultra-low-power wake-up logic. Use Value: ICEX ≤ 50 nA at VCE = 30 V ensures negligible standby current leakage, preserving battery life during vehicle sleep mode. |
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 |
|---|---|---|---|
| ON Semiconductor NSS40301MR6T1G | Higher VCEO = 45 V; lower hFE min = 30 at IC = 10 mA; same SOT23-3 package. | Preferred for 24 V industrial PLC I/O modules where margin above 40 V is required. | Select when higher breakdown voltage is prioritized over guaranteed mid-current hFE consistency. |
| Nexperia PBSS4041T,215 | AEC-Q101 qualified; VCEO = 40 V; hFE = 100–300 at IC = 10 mA; RθJA = 390 °C/W (worse thermal performance). | Used in ADAS camera power sequencing where identical voltage specs suffice but thermal budget is looser. | Choose only if supply chain diversification is needed and thermal derating margin is available. |
Compared with NSS40301MR6T1G and PBSS4041T,215, the MMBT3904Q-7-F delivers superior thermal resistance (357 vs. ≥390 °C/W), tighter hFE distribution across current range, and documented 4 kV HBM ESD robustness - making it optimal for space-constrained, thermally demanding automotive modules.
Availability
MMBT3904Q-7-F is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, LED lighting drivers, and power supply enable circuits requiring stable component supply, AEC-Q101 compliance, and SOT23 footprint compatibility.
Supply support for MMBT3904Q-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 the Americas.
The MMBT3904Q belongs to Diodes' automotive-qualified bipolar transistor product line, engineered specifically for reliable switching and amplification in harsh-environment vehicle subsystems including door modules, lighting, and sensor signal chains.
FAQ
Is MMBT3904Q-7-F pin-compatible with the legacy MMBT3904?
Yes - both share identical SOT23 pinout (Emitter-Base-Collector on pins 1-2-3) and mechanical dimensions. However, MMBT3904Q-7-F adds AEC-Q101 qualification, IATF16949 manufacturing, and tighter hFE binning; legacy MMBT3904 lacks automotive certification and may exhibit wider parameter spread.
What is the maximum continuous collector current for MMBT3904Q-7-F at 105°C ambient?
At TA = 105°C, derated power dissipation is 175 mW (per thermal curve on page 3 of DS45242). With VCE(sat) ≤ 0.30 V, maximum continuous IC = 175 mW / 0.30 V ≈ 583 mA - but absolute maximum rating remains 200 mA per datasheet, limiting practical use to 200 mA regardless of thermal headroom.
Does MMBT3904Q-7-F support pulsed operation beyond 200 mA?
Yes - the datasheet specifies pulse testing up to 500 mA (page 4, switching characteristics test conditions). Pulse width must remain ≤ 300 µs with ≤ 2% duty cycle to avoid exceeding junction temperature limits; this enables short-duration surge handling in motor commutation or fault detection circuits.
Can MMBT3904Q-7-F replace BC847BW in existing designs?
Only with validation - both are SOT323-packaged NPN transistors, but MMBT3904Q-7-F uses SOT23 (larger pad pitch, different thermal profile) and has higher VCEO (40 V vs. 45 V) and lower hFE minimum at 10 mA (60 vs. 110). Mechanical incompatibility and gain mismatch make direct substitution unsafe without layout and bias redesign.
MMBT3904Q-7-F 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:
- 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):
- 50nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBT3904Q-7-F FAQ
1.How can I place an order for MMBT3904Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT3904Q-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 MMBT3904Q-7-F reliable?
The price and inventory of MMBT3904Q-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 MMBT3904Q-7-F is usually 5 days.
3.What payment methods are accepted for MMBT3904Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3904Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT3904Q-7-F?
MMBT3904Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT3904Q-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 MMBT3904Q-7-F?
For technical support, including MMBT3904Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3904Q-7-F requirements.
6.How does Aetrix verify that MMBT3904Q-7-F is sourced from the original manufacturer or authorized distributors?
All MMBT3904Q-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 MMBT3904Q-7-F meets industry standards.
7.What is the process for return or replacement of MMBT3904Q-7-F?
All MMBT3904Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3904Q-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 MMBT3904Q-7-F part is unused and in its original packaging.
Return procedure for MMBT3904Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBT3904Q-7-F Tags
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Diodes Incorporated
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