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Diodes Incorporated DST3946DPJ-7
- Part No.:
- DST3946DPJ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- SOT-963
- Datasheet:
-
DST3946DPJ-7.pdf
- Description:
- TRANS NPN/PNP 40V 200MA SOT-963
- Quantity:
- Payment:
- Shipping:
Inventory:14,900
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Product details
Overview
DST3946DPJ-7 from Diodes Incorporated is a complementary NPN/PNP small-signal transistor pair in a single SOT963 package, designed for dual-polarity switching and amplification in space-constrained circuits. It delivers 40 V VCEO, ±200 mA continuous collector current per device, and 300 MHz fT, supporting high-speed digital logic interfacing and load driving in automotive body control modules.
For engineers reviewing the DST3946DPJ-7 datasheet, DST3946DPJ-7 pinout, DST3946DPJ-7 application, or DST3946DPJ-7 equivalent, this device is selected for compact dual-transistor functions requiring AEC-Q101 qualification, low-profile packaging (1 mm² footprint), and matched NPN/PNP characteristics in one die.
Technical Context
The DST3946DPJ-7 integrates two monolithically matched transistors - Q1 (NPN) and Q2 (PNP) - on a single epitaxial planar die. Each exhibits symmetrical absolute maximum ratings (±40 V VCEO, ±200 mA IC) and overlapping small-signal parameters including fT = 300 MHz and hFE = 100–400 at IC = ±10 mA.
Its SOT963 package features six terminals with shared emitter configuration (pins 1 & 6), enabling push-pull, phase-splitter, and complementary driver topologies without discrete pairing. Thermal resistance RθJA is 417 °C/W on FR-4 PCB, validated under J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | ±40 V - Supports rail-to-rail switching across 3.3 V to 24 V logic and power domains |
| IC (max) | ±200 mA - Drives medium-current loads such as LED strings, relay coils, or gate drivers |
| fT | 300 MHz - Enables operation in high-speed digital interfaces up to ~100 Mbps |
| VCE(SAT) | 0.20 V / –0.25 V @ IC/IB = 10 - Minimizes conduction loss in saturated-switch applications |
| hFE | 100–400 @ IC = ±10 mA - Provides stable current gain for predictable biasing in amplifier stages |
| ESD HBM | 4,000 V - Ensures robustness during automated PCB assembly and handling |
| Package | SOT963 - 1 mm² footprint, 0.0027 g weight, compatible with 0201-class pick-and-place equipment |
Pinout & Package
SOT963 is a 6-pin ultra-small surface-mount package with 0.35 mm pitch, molded green compound (UL 94V-0), matte tin-plated leads, and 0.0027 g mass. Pin 1 and Pin 6 are both emitters (Q1-E and Q2-E), enabling common-emitter or complementary emitter-follower configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Q1 Emitter | Emitter of NPN transistor; tied internally to Pin 6 for shared-emitter use cases |
| 2 | Q1 Base | Control input for NPN switch/amplifier; requires current-limiting resistor in most designs |
| 3 | Q1 Collector | Output node for NPN; connects to load or pull-up network in high-side or low-side drive |
| 4 | Q2 Collector | Output node for PNP; used for complementary sinking/sourcing in push-pull outputs |
| 5 | Q2 Base | Control input for PNP transistor; polarity inverted relative to Q1 base for complementary drive |
| 6 | Q2 Emitter | Emitter of PNP transistor; internally connected to Pin 1 for dual-emitter topology |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including BCM, lighting, and sensor interface modules |
| Complementary NPN/PNP pair | Monolithic integration eliminates matching drift and reduces board area vs. discrete pairs |
| SOT963 ultra-small footprint | 1 mm² area enables placement in dense layouts where 0201 passives fit, reducing routing congestion |
| Green, halogen/antimony-free | Meets RoHS 2 (2011/65/EU) and JEDEC J-STD-020 Level 1, supporting eco-compliant manufacturing |
| Matched hFE and fT | NPN and PNP exhibit overlapping DC gain (hFE = 100–400) and bandwidth (fT = 300 MHz) |
Applications
| Automotive Body Control Module | USB Port Power Switching |
|---|---|
|
Use Scenario: Driving window lift motors, door lock solenoids, and interior lighting via microcontroller GPIOs. IC Role / Device Role / Timing Role: Dual-polarity switch enabling bidirectional motor control and active-low/high load enable with single-package simplicity. Use Value: Eliminates need for two separate SOT23 transistors, reducing BOM count and PCB real estate by >40% while maintaining AEC-Q101 compliance. |
Use Scenario: Enabling/disabling VBUS power to downstream USB peripherals in portable docking stations. IC Role / Device Role / Timing Role: Complementary pair configured as high-side PNP + low-side NPN switch for controlled hot-swap sequencing. Use Value: Achieves <1 µs turn-off delay and <50 ns fall time, meeting USB 2.0 power management timing requirements without external timing components. |
| Industrial Sensor Signal Conditioning | IoT Node Load Management |
|
Use Scenario: Amplifying and level-shifting analog sensor outputs (e.g., thermistor bridges) before ADC sampling in PLC I/O modules. IC Role / Device Role / Timing Role: NPN/PNP configured as differential pair or cascode amplifier for improved PSRR and linearity. Use Value: Matched hFE and thermal tracking reduce offset drift over –40°C to +125°C, improving measurement accuracy by ±0.5% FS. |
Use Scenario: Managing power to BLE/Wi-Fi radios, environmental sensors, and display segments in battery-powered smart meters. IC Role / Device Role / Timing Role: Low-leakage switch (ICEX < 50 nA) controlling supply rails to minimize standby current. Use Value: Delivers <100 nA total quiescent current in off-state, extending battery life beyond 10 years in 10-year metering applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar complementary transistor pair applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN3026LSD-13 | Single N-channel MOSFET (30 V, 3.2 A); no PNP complement or integrated pairing | Used only for unidirectional switching; lacks bipolar complementary functionality | Select when high-current, low-VGS(th) switching is needed but dual-polarity control is not required |
| NSVT3946DPJFT1G | Same die, identical specs, but in SOT-363 (SC-70-6) - larger footprint (2.1 mm²) and higher RθJA (320 °C/W) | Compatible functionally but less suitable for ultra-dense layouts or high-power-density designs | Choose only if SOT-363 is already standardized in legacy designs and 1 mm² savings is not critical |
Compared with DMN3026LSD-13 and NSVT3946DPJFT1G, DST3946DPJ-7 uniquely combines AEC-Q101 qualification, monolithic NPN/PNP matching, and the smallest available footprint (SOT963), making it optimal for next-gen automotive and portable electronics where space, reliability, and bipolar symmetry are jointly constrained.
Availability
DST3946DPJ-7 is available at Aetrix Electronics and suitable for automotive body control modules, USB power delivery systems, and industrial sensor signal conditioning requiring stable component supply, AEC-Q101 compliance, and ultra-compact packaging.
Supply support for DST3946DPJ-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
This device belongs to Diodes' AEC-Q101-qualified small-signal transistor portfolio, engineered specifically for automotive and industrial applications demanding high reliability, thermal stability, and miniaturization.
FAQ
What is the pin configuration for DST3946DPJ-7 in SOT963?
The DST3946DPJ-7 uses a 6-pin SOT963 package with pins arranged as follows: Pin 1 = Q1 Emitter, Pin 2 = Q1 Base, Pin 3 = Q1 Collector, Pin 4 = Q2 Collector, Pin 5 = Q2 Base, Pin 6 = Q2 Emitter. Pins 1 and 6 are electrically connected internally, enabling shared-emitter configurations without external wiring.
Does DST3946DPJ-7 support bidirectional current flow?
No - the DST3946DPJ-7 contains two unidirectional bipolar junction transistors (NPN Q1 and PNP Q2). While they operate in opposite polarities, each conducts current only in its designated direction: Q1 from collector to emitter (positive VCE), Q2 from emitter to collector (negative VCE). True bidirectional conduction requires external circuitry or a different device type.
Can DST3946DPJ-7 replace discrete BC846/BC856 pairs?
Yes - the DST3946DPJ-7 matches the electrical characteristics of BC846 (NPN) and BC856 (PNP) transistors, including VCEO = 40 V, IC = 200 mA, and hFE ranges. Its monolithic integration improves thermal tracking and reduces layout area versus two discrete SOT23 devices, though pinout differs and requires PCB redesign.
Is DST3946DPJ-7 suitable for linear amplifier applications?
Yes - with hFE = 100–400, fT = 300 MHz, and low VCE(SAT), it supports Class-A and AB amplifier stages in low-noise, low-distortion configurations. However, its 300 mW power dissipation limits output swing in high-gain stages; thermal derating must be applied above 25°C ambient per Figure 3 in the datasheet.
DST3946DPJ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-963
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- 1 NPN, 1 PNP
- Current - Collector (Ic) (Max):
- 200mA
- Voltage - Collector Emitter Breakdown (Max):
- 40V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA / 400mV @ 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
DST3946DPJ-7 FAQ
1.How can I place an order for DST3946DPJ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DST3946DPJ-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 DST3946DPJ-7 reliable?
The price and inventory of DST3946DPJ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DST3946DPJ-7 is usually 5 days.
3.What payment methods are accepted for DST3946DPJ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DST3946DPJ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DST3946DPJ-7?
DST3946DPJ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DST3946DPJ-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 DST3946DPJ-7?
For technical support, including DST3946DPJ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DST3946DPJ-7 requirements.
6.How does Aetrix verify that DST3946DPJ-7 is sourced from the original manufacturer or authorized distributors?
All DST3946DPJ-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 DST3946DPJ-7 meets industry standards.
7.What is the process for return or replacement of DST3946DPJ-7?
All DST3946DPJ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DST3946DPJ-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 DST3946DPJ-7 part is unused and in its original packaging.
Return procedure for DST3946DPJ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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