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onsemi MMBT3904SL
- Part No.:
- MMBT3904SL
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- SOT-923F
- Datasheet:
-
MMBT3904SL.pdf
- Description:
- TRANS NPN 40V 0.2A SOT-923F
- Quantity:
- Payment:
- Shipping:
Inventory:1,432,092
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Product details
Overview
MMBT3904SL from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for general-purpose amplification and switching in low-power, space-constrained circuits. It delivers 200 mA collector current, 40 V VCEO, 300 MHz fT, and operates up to 150°C junction temperature-commonly used in portable audio preamps, LED drivers, and logic-level interface stages.
For engineers reviewing the MMBT3904SL datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-923F ultra-thin package (0.43 mm max height), DC current gain range (30–300 at IC = 0.1–100 mA), saturation voltage performance (0.2 V at IC = 10 mA/IB = 1 mA), and thermal resistance (550 °C/W).
Technical Context
This discrete NPN bipolar junction transistor uses epitaxial base construction for stable high-frequency response and low leakage. Its 300 MHz current gain bandwidth product and 6 pF output capacitance support RF amplifier and fast-switching applications up to ~100 MHz, while the 550 °C/W thermal resistance requires careful PCB land design per JEDEC standards.
The device operates with fixed-base bias or emitter-follower configurations, exhibiting well-characterized VBE(sat) (0.65–0.95 V) and VCE(sat) (0.2–0.3 V) across 10–50 mA loads. Its 50 nA ICEX at VCE = 60 V ensures low standby power in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions |
| IC | 200 mA - Continuous DC collector current rating without thermal derating at 25°C ambient |
| fT | 300 MHz - Frequency at which small-signal current gain drops to unity; usable for VHF amplification |
| RθJA | 550 °C/W - Thermal resistance from junction to ambient; requires ≥1.0 mm² minimum copper pad for full 227 mW dissipation |
| Cob | 6 pF - Output capacitance at VCB = 5 V; limits high-frequency gain and switching speed in tuned circuits |
| hFE (min) | 30 - Minimum DC current gain at IC = 100 mA, ensuring predictable switching margin in digital logic interfaces |
| VCE(sat) | 0.2 V - Collector-emitter saturation voltage at IC/IB = 10, enabling <100 mW conduction loss in 3.3 V logic-driven switches |
Pinout & Package
Package: SOT-923F - ultra-small surface-mount plastic package (1.0 × 0.6 × 0.43 mm), Pb-free matte tin plating, MSL 1, UL V0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitting terminal for majority carriers | Low-impedance return path; connected to ground or low-side reference in common-emitter switches |
| 2 (Base) | Control electrode for carrier injection | Requires current-limited drive (typically 1–10% of IC) to ensure saturation without overdrive |
| 3 (Collector) | Current-collecting terminal | Connected to load or supply rail; handles full switched current and must route heat via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-thin SOT-923F package | 0.43 mm max height enables use in <0.5 mm Z-height portable assemblies (e.g., wearables, thin displays) |
| High fT / low Cob combination | 300 MHz gain-bandwidth with only 6 pF output capacitance supports clean 50–100 MHz signal amplification |
| Wide hFE range across operating currents | Specified hFE = 40–300 from 0.1 mA to 100 mA ensures consistent gain in both bias and switching modes |
| Pb-free and RoHS-compliant construction | Matte tin lead finish meets JESD22-A121 solderability and IPC/JEDEC moisture sensitivity level 1 requirements |
Applications
| Portable Audio Amplifier Stage | LED Current Switch |
|---|---|
Use Scenario: Low-voltage headphone driver preamp stage in Bluetooth earbuds. IC Role / Device Role / Timing Role: NPN small-signal amplifier configured in common-emitter topology with emitter degeneration. Use Value: 300 MHz fT preserves audio fidelity up to 20 kHz with <0.5% THD; 0.2 V VCE(sat) minimizes dropout in 3.3 V supply rails. | Use Scenario: Constant-current sink for white LED backlight in smartwatch display modules. IC Role / Device Role / Timing Role: Linear current regulator using base-bias resistor network and emitter-sense resistor. Use Value: Tight VBE(sat) tolerance (0.65–0.95 V) enables ±5% LED current accuracy; 150°C TJ rating withstands localized heating near OLED panels. |
| Logic-Level Interface Translator | Low-Power Sensor Signal Conditioning |
Use Scenario: 1.8 V microcontroller GPIO driving 5 V peripheral enable lines. IC Role / Device Role / Timing Role: Single-transistor level shifter in open-collector configuration with pull-up to 5 V. Use Value: 40 V VCEO provides 3× safety margin against transients; 35 ns td/tr supports >10 MHz digital signaling. | Use Scenario: Amplifying thermistor or photodiode output in battery-powered environmental sensor nodes. IC Role / Device Role / Timing Role: High-input-impedance common-collector buffer feeding ADC input. Use Value: 50 nA ICEX prevents signal drift in high-Z sensor paths; -55°C to 150°C TSTG supports industrial outdoor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT3904LT1G | SOT-23 package (1.3 mm height); higher RθJA (625 °C/W); same electrical specs | Less suitable for ultra-thin devices; better thermal mass for intermittent 250 mW pulses | Select when board height >0.6 mm allows and pulse operation dominates |
| DXT3904TC | SOT-523 package (same 0.43 mm height); 200 mA IC, but fT = 250 MHz and Cob = 8 pF | Slightly lower RF gain and higher capacitance limit use above 80 MHz | Select when footprint compatibility with other Diodes Inc. SOT-523 devices is required |
Compared with MMBT3904SL, the MMBT3904LT1G trades package thinness for slightly better pulse handling, while DXT3904TC matches height but sacrifices 50 MHz bandwidth and adds 2 pF output capacitance-making MMBT3904SL optimal for space-constrained, wideband analog or fast digital interface roles.
Availability
MMBT3904SL is available at Aetrix Electronics and suitable for portable electronics, LED lighting control, and sensor interface circuits requiring stable component supply and long-term manufacturability.
Supply support for MMBT3904SL 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBT3904SL belongs to Fairchild's legacy general-purpose transistor family, engineered specifically for miniaturized consumer electronics where ultra-low profile, consistent gain, and reliable switching performance are critical.
FAQ
What is the maximum continuous collector current rating for MMBT3904SL?
The MMBT3904SL has a maximum continuous collector current (IC) rating of 200 mA at TA = 25°C. This rating assumes proper PCB thermal relief per the SOT-923F land pattern recommendation. At elevated ambient temperatures or without adequate copper area, derating applies-e.g., ~150 mA at 70°C ambient per the 227 mW power limit and 550 °C/W RθJA.
Does MMBT3904SL support high-frequency amplification applications?
Yes, the MMBT3904SL supports high-frequency amplification with a specified current gain bandwidth product (fT) of 300 MHz at VCE = 20 V, IC = 10 mA, and f = 100 MHz. Its 6 pF output capacitance (Cob) and low saturation voltages make it suitable for VHF amplifiers, RF detector stages, and broadband preamplifiers up to ~100 MHz, provided layout minimizes parasitic inductance.
What is the pin configuration of MMBT3904SL in the SOT-923F package?
The MMBT3904SL in SOT-923F uses a 3-pin configuration: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (viewed top-down with marking "AA" oriented left-to-right). This matches JEDEC standard orientation for SOT-923F and is confirmed in the official Fairchild MMBT3904SL Rev. 1.0.0 datasheet Figure 1 on page 2.
Is MMBT3904SL RoHS-compliant and lead-free?
Yes, the MMBT3904SL is RoHS-compliant and lead-free, with pure matte tin plating on its terminals. It meets JESD22-A113B moisture sensitivity level 1 (MSL 1), has UL V0 flammability rating, and conforms to MIL-STD-750 Method 2026 for solderability-making it suitable for modern reflow assembly processes without lead-free exemptions.
How does MMBT3904SL compare to the complementary PNP type MMBT3906SL?
The MMBT3904SL (NPN) and MMBT3906SL (PNP) share identical SOT-923F packaging, thermal characteristics, and absolute maximum ratings-including 40 V VCEO/VECO, 200 mA IC, and 150°C TJ. Their electrical parameters are mirrored: MMBT3906SL offers comparable hFE, VCE(sat), and fT (250 MHz), enabling balanced push-pull or complementary switching designs using the same footprint.
MMBT3904SL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-923F
- Packaging:
- Bulk
- 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:
- 227 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-923F
MMBT3904SL FAQ
1.How can I place an order for MMBT3904SL through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT3904SL 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 MMBT3904SL reliable?
The price and inventory of MMBT3904SL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3904SL is usually 5 days.
3.What payment methods are accepted for MMBT3904SL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3904SL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT3904SL?
MMBT3904SL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT3904SL 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 MMBT3904SL?
For technical support, including MMBT3904SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3904SL requirements.
6.How does Aetrix verify that MMBT3904SL is sourced from the original manufacturer or authorized distributors?
All MMBT3904SL 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 MMBT3904SL meets industry standards.
7.What is the process for return or replacement of MMBT3904SL?
All MMBT3904SL units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3904SL, 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 MMBT3904SL part is unused and in its original packaging.
Return procedure for MMBT3904SL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBT3904SL Tags
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