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Diodes Incorporated DST3904DJ-7
- Part No.:
- DST3904DJ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- SOT-963
- Datasheet:
-
DST3904DJ-7.pdf
- Description:
- TRANS 2NPN 40V 200MA SOT-963
- Quantity:
- Payment:
- Shipping:
Inventory:34,931
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Product details
Overview
DST3904DJ-7 from Diodes Incorporated is a dual NPN bipolar junction transistor in ultra-small SOT-963 package, rated for 40 V VCEO, 200 mA continuous collector current, and 300 mW power dissipation. It features epitaxial planar die construction, RoHS-compliant matte tin terminals, and is optimized for high-density signal switching in portable power management and LED driver circuits.
For engineers reviewing the DST3904DJ-7 datasheet, DST3904DJ-7 pinout, DST3904DJ-7 application, or DST3904DJ-7 equivalent, key selection criteria include its dual-NPN configuration, low VCE(SAT) (0.20 V @ 10 mA/1 mA), high fT of 300 MHz, thermal resistance of 417 °C/W, and suitability for automated SMT assembly on space-constrained PCBs.
Technical Context
This dual NPN transistor supports independent or paralleled switching paths with matched gain characteristics across both devices. Its 60 V VCBO, 6.0 V VEBO, and 50 nA ICEX ensure robust off-state isolation under bias stress up to 30 V.
Switching performance is defined by td/tr/ts/tf ≤ 35/35/200/50 ns under 3.0 V VCC, 10 mA IC, and 1.0 mA IB conditions, with hFE ranging 40–300 depending on IC (100 µA to 100 mA) and VCE = 1.0 V, enabling precise current amplification in bias networks and digital logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (continuous) | 200 mA - Continuous DC collector current rating at TA = 25°C with FR-4 pad layout. |
| PD | 300 mW - Power dissipation limit at 25°C ambient; derates linearly above 25°C per Fig. 3. |
| fT | 300 MHz - Transition frequency indicating usable bandwidth for small-signal amplification. |
| VCE(SAT) | 0.20 V @ IC=10 mA, IB=1 mA - Low saturation voltage enables efficient switching with minimal conduction loss. |
| RθJA | 417 °C/W - Junction-to-ambient thermal resistance defines temperature rise per watt dissipated on standard PCB. |
| hFE | 100 min @ IC=1 mA, VCE=1 V - Guaranteed DC current gain for reliable base drive sizing in linear or saturated operation. |
Pinout & Package
Package: SOT-963 - ultra-compact 6-pin surface-mount plastic package (0.95 × 0.95 × 0.45 mm), moisture sensitivity level 1, UL 94V-0 rated, weight ≈ 0.0027 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter of Transistor 1 (E1) | Low-impedance current sink node; internally connected to leadframe for thermal path. |
| 2 | Base of Transistor 1 (B1) | Control input for first NPN; requires ~0.7 V forward bias to turn on. |
| 3 | Collector of Transistor 1 (C1) | High-side current output node; rated for 40 V and 200 mA continuous. |
| 4 | Collector of Transistor 2 (C2) | Independent high-side output for second NPN; electrically isolated from C1. |
| 5 | Base of Transistor 2 (B2) | Separate control input; enables independent or synchronized switching of dual channels. |
| 6 | Emitter of Transistor 2 (E2) | Second low-impedance sink; not internally tied to E1 - supports fully isolated dual operation. |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die construction | Ensures consistent hFE matching between dual transistors and stable high-frequency response. |
| Ultra-small SOT-963 footprint | Reduces board area by >50% vs. SOT-363; enables <1.0 mm² per channel in dense portable layouts. |
| RoHS-compliant matte tin finish | Guarantees solderability per MIL-STD-202 Method 208 and eliminates lead/halogen/antimony. |
| Low VCE(SAT) and VBE(SAT) | Minimizes voltage drop and power loss in switching applications operating at 1–10 mA load currents. |
| 300 MHz fT | Supports clean digital signal switching up to ~30 MHz with controlled edge rates and minimal overshoot. |
Applications
| LED Backlight Control | Portable Device Power Sequencing |
|---|---|
Use Scenario: Driving parallel white LEDs in smartphone or tablet displays using PWM dimming at 1–10 kHz. IC Role / Device Role / Timing Role: Dual-NPN switch controlling cathode-side current paths; one transistor per LED string. Use Value: Low VCE(SAT) (0.20 V) reduces power loss and thermal load on 200 mA LED strings, extending battery life. | Use Scenario: Enabling/disabling voltage rails (e.g., 3.3 V, 1.8 V) during boot-up or sleep mode in wearables. IC Role / Device Role / Timing Role: Discrete load switch replacing integrated PMIC FETs where cost and footprint are critical. Use Value: Matched hFE ensures consistent turn-on timing across rails; SOT-963 saves >0.5 mm² vs. dual-SOT-23 solutions. |
| USB Port Protection Circuitry | IoT Sensor Interface Buffering |
Use Scenario: Isolating downstream USB data lines (D+/D−) from host-side ESD transients using active clamping. IC Role / Device Role / Timing Role: Fast-switching NPN pair acting as bidirectional current-controlled shunt switches. Use Value: 35 ns rise/fall times enable sub-100 ns transient response; 6.0 V VEBO supports ±5 V signal swing protection. | Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor, Hall effect) into MCU ADC inputs. IC Role / Device Role / Timing Role: Emitter-follower amplifier stage providing low-output-impedance drive without loading sensitive sensors. Use Value: hFE ≥100 at 1 mA ensures stable gain; 8.5 pF Cibo minimizes capacitive loading on high-impedance sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN3026LSD-13 | Single-channel 30 V N-channel MOSFET (SOT-23); no dual configuration, gate-driven vs. BJT base drive. | Requires higher gate voltage (≥2.5 V), lacks inherent current gain; unsuitable for low-base-drive microcontroller GPIOs. | Select only if logic-level gate drive and zero gate current are required; not a functional replacement for BJT-based bias networks. |
| MBT3904DW1T1G | Pin-compatible dual NPN in SOT-363; identical VCEO/IC/hFE, but larger 2.1 × 1.25 mm footprint and 2× higher RθJA (≈800 °C/W). | Same circuit function but occupies >3× more PCB area; thermal performance limits sustained 200 mA operation. | Choose when SOT-363 is already standardized in design; avoid when board space or thermal headroom is constrained. |
Compared with DST3904DJ-7, MBT3904DW1T1G offers identical electrical behavior but sacrifices miniaturization and thermal efficiency, while DMN3026LSD-13 replaces current amplification with voltage-controlled switching-requiring redesign of base/gate drive networks and compromising low-current gain linearity.
Availability
DST3904DJ-7 is available at Aetrix Electronics and suitable for LED backlight control, portable device power sequencing, and IoT sensor interface buffering requiring stable component supply and high-volume SMT compatibility.
Supply support for DST3904DJ-7 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, energy-efficient components for consumer, industrial, and automotive markets.
The DST3904DJ-7 belongs to Diodes' precision bipolar transistor product line, engineered for space-constrained, high-yield automated assembly in portable electronics where thermal density and footprint reduction are critical design constraints.
FAQ
What is the maximum operating temperature for DST3904DJ-7?
The DST3904DJ-7 has an operating junction temperature range of −55°C to +150°C. Its absolute maximum storage temperature matches this range. Derating begins at 25°C ambient per the 417 °C/W RθJA; at 85°C ambient, max continuous power drops to ~170 mW to maintain TJ ≤ 150°C.
Is DST3904DJ-7 suitable for linear amplifier applications?
Yes, but with limitations. Its hfe = 100–400 and fT = 300 MHz support small-signal amplification up to ~30 MHz. However, low PD (300 mW) and high RθJA restrict use to low-power, Class-A or AB stages with careful thermal design and bias stabilization.
How does the SOT-963 package affect reflow profile requirements?
SOT-963's ultra-low mass (0.0027 g) and level-1 moisture sensitivity allow standard JEDEC J-STD-020 profiles without pre-bake. Peak reflow temperature must not exceed 260°C for ≤10 seconds; ramp rates should stay within 3°C/s to prevent delamination or pad lift due to thermal shock.
Can the two transistors in DST3904DJ-7 be used in a Darlington configuration?
No - the SOT-963 pinout separates all six terminals (E1/B1/C1/C2/B2/E2) with no internal connection between collectors or emitters. A discrete Darlington would require external wiring, defeating the purpose of integration; the device is intended for independent or paralleled switching, not cascaded gain stages.
DST3904DJ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-963
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- 2 NPN (Dual)
- Current - Collector (Ic) (Max):
- 200mA
- Voltage - Collector Emitter Breakdown (Max):
- 40V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 300mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-963
DST3904DJ-7 FAQ
1.How can I place an order for DST3904DJ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DST3904DJ-7 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 DST3904DJ-7 reliable?
The price and inventory of DST3904DJ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DST3904DJ-7 is usually 5 days.
3.What payment methods are accepted for DST3904DJ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DST3904DJ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DST3904DJ-7?
DST3904DJ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DST3904DJ-7 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 DST3904DJ-7?
For technical support, including DST3904DJ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DST3904DJ-7 requirements.
6.How does Aetrix verify that DST3904DJ-7 is sourced from the original manufacturer or authorized distributors?
All DST3904DJ-7 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 DST3904DJ-7 meets industry standards.
7.What is the process for return or replacement of DST3904DJ-7?
All DST3904DJ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DST3904DJ-7, 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 DST3904DJ-7 part is unused and in its original packaging.
Return procedure for DST3904DJ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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