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Diodes Incorporated DST3946DPJ-7B
- Part No.:
- DST3946DPJ-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- SOT-963
- Datasheet:
-
DST3946DPJ-7B.pdf
- Description:
- TRANS NPN/PNP 40V 200MA SOT-963
- Quantity:
- Payment:
- Shipping:
Inventory:7,443
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Product details
Overview
DST3946DPJ-7B 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 40V VCEO, ±200mA collector current capability per transistor, and operates across –55°C to +150°C - enabling use in automotive body control modules and industrial sensor interface stages.
For engineers reviewing the DST3946DPJ-7B datasheet, DST3946DPJ-7B pinout, DST3946DPJ-7B application, or DST3946DPJ-7B equivalent, key selection criteria include complementary polarity matching, ultra-small 1 mm² footprint, AEC-Q101 qualification, and validated thermal performance up to 150°C ambient.
Technical Context
This device integrates two discrete transistors - Q1 (NPN) and Q2 (PNP) - on a single epitaxial planar die within a monolithic SOT963 package. Each transistor supports independent biasing with fully specified absolute maximum ratings and electrical characteristics at ±25°C and extended temperature ranges.
The NPN section features BVCEO = 40 V, hFE = 40–300 (IC = 100 µA to 100 mA), and fT = 300 MHz; the PNP section provides symmetric ratings including BVCEO = –40 V, comparable hFE range, and matched switching times (tS ≤ 225 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | ±40 V - Enables rail-to-rail switching in 3.3 V/5 V/12 V logic-level interfaces without breakdown risk. |
| IC | ±200 mA - Supports driving medium-current loads such as LED arrays, relay coils, and gate drivers. |
| PD | 300 mW - Sustains continuous operation at ambient temperatures up to 85°C with standard FR-4 PCB layout. |
| fT | 300 MHz - Suitable for high-speed digital switching (e.g., PWM dimming, level translation) up to ~50 MHz. |
| RθJA | 417 °C/W - Confirmed thermal resistance under JEDEC-standard mounting; enables accurate junction-temp estimation. |
| ESD HBM | 4,000 V - Robust handling during automated assembly and board-level integration without special ESD controls. |
| AEC-Q101 | Qualified - Meets stress-test requirements for automotive electronics including temperature cycling and HTOL. |
Pinout & Package
SOT963 is a 6-pin ultra-compact surface-mount package measuring 1.0 × 1.0 × 0.5 mm with 0.35 mm pitch, optimized for high-density routing and reflow compatibility. Matte tin-plated leads ensure solderability per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NPN Emitter (Q1) | Common emitter node for NPN transistor; referenced to ground or low-side return path. |
| 2 | NPN Base (Q1) | Control input for NPN switch/amplifier; requires current-limited drive (~1–5 mA typical). |
| 3 | PNP Collector (Q2) | High-side output node for PNP transistor; connects to positive supply rail in high-side switch configurations. |
| 4 | PNP Base (Q2) | Inverted control input for PNP; active-low enable in push-pull or complementary driver topologies. |
| 5 | PNP Emitter (Q2) | Common emitter node for PNP transistor; typically tied to VCC in high-side applications. |
| 6 | NPN Collector (Q1) | Low-side output node for NPN transistor; sinks current to ground in standard switch configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary NPN/PNP pairing | Enables compact push-pull, H-bridge, and level-shifting circuits without discrete part matching effort. |
| SOT963 1 mm² footprint | Reduces PCB area by >50% vs. dual-SOT23 solutions; supports ≥0.35 mm trace/space design rules. |
| AEC-Q101 qualification | Validated reliability for automotive cabin electronics, lighting control, and power management modules. |
| Epitaxial planar die construction | Delivers consistent hFE matching (<±20%) and low leakage (ICEX ≤ ±50 nA) across temperature. |
| Green, halogen-free packaging | Meets IEC 61249-2-21 and RoHS 2 compliance with Br+Cl <1500 ppm and Sb <1000 ppm. |
Applications
| Automotive LED Tail Light Driver | Industrial Push-Pull Level Shifter |
|---|---|
Use Scenario: Driving dual-color (red/amber) LED strings from 12 V vehicle battery with PWM dimming control. IC Role / Device Role / Timing Role: Complementary transistor pair acts as low-side (NPN) and high-side (PNP) switches in constant-current sink/source configuration. Use Value: Eliminates need for separate high-voltage P-channel MOSFET; leverages ±40 V rating to tolerate load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: Translating 3.3 V microcontroller GPIO signals to 5 V or 12 V logic levels for legacy industrial I/O modules. IC Role / Device Role / Timing Role: NPN/PNP pair forms an active pull-up/pull-down stage with sub-100 ns switching and matched tR/tF. Use Value: Achieves clean edge integrity without external resistors; fT = 300 MHz supports data rates >20 Mbps in RS-422-like signaling. |
| Consumer Appliance Motor Control | Medical Sensor Signal Conditioning |
Use Scenario: Bidirectional DC motor control in smart home appliances (e.g., HVAC damper actuators) using half-H-bridge topology. IC Role / Device Role / Timing Role: Q1 (NPN) and Q2 (PNP) serve as synchronized low-side and high-side switches with shared base drive timing. Use Value: ±200 mA IC sustains 100–150 mA motor stall current; SOA curves validate safe 100 ms pulse operation at 85°C ambient. |
Use Scenario: Amplifying low-level thermistor or bridge-sensor outputs in portable diagnostic devices with tight power budgets. IC Role / Device Role / Timing Role: NPN configured as common-emitter amplifier; PNP used for active load or bias current mirror. Use Value: hFE stability over –55°C to +150°C ensures calibration retention across clinical operating environments. |
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 bipolar gain control. | Replaces only low-side switching function; requires external P-channel device for full bridge. | Select when higher efficiency (>95%) and lower gate drive power are required over bipolar linearity. |
| NSBC114YDXV6T1G | Matched NPN+PNP pair in SOT-563; lower VCEO (50 V/–50 V), lower IC (100 mA), no AEC-Q101 rating. | Suitable for consumer-grade signal routing but not automotive transients or extended temperature operation. | Choose for cost-sensitive non-automotive designs where 50 V margin and 100 mA max load suffice. |
Compared with DMN3026LSD-13 and NSBC114YDXV6T1G, DST3946DPJ-7B uniquely combines AEC-Q101 qualification, ±40 V robustness, and true bipolar gain control in a 1 mm² footprint - making it optimal for space- and reliability-critical dual-polarity switching.
Availability
DST3946DPJ-7B is available at Aetrix Electronics and suitable for automotive lighting control, industrial I/O level shifting, and medical sensor interface applications requiring stable component supply and long-term lifecycle support.
Supply support for DST3946DPJ-7B 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 and manufacturing operations across Asia and the Americas.
The DST3946DPJ belongs to Diodes' AEC-Q101-qualified small-signal transistor portfolio, engineered specifically for automotive body electronics, industrial automation, and high-reliability embedded systems demanding compact, thermally robust switching.
FAQ
What is the maximum allowable junction temperature for DST3946DPJ-7B?
The device is rated for TJ up to +150°C, verified per AEC-Q101 thermal cycling and high-temperature operating life tests. At TA = 85°C and PD = 300 mW, junction temperature reaches ~118°C using RθJA = 417°C/W - remaining within safe operational limits.
Can DST3946DPJ-7B be used in linear amplifier configurations?
Yes - its hFE linearity (40–300 across IC = 100 µA to 100 mA) and low VCE(SAT) (≤0.3 V at 10 mA) support Class-A and AB amplifier stages. However, power dissipation must be limited to ≤150 mW for sustained linear operation to avoid thermal runaway.
Is the SOT963 package compatible with standard reflow profiles?
Yes - the matte tin-plated leads meet J-STD-020 moisture sensitivity Level 1 and are qualified for peak reflow temperatures up to 260°C. Recommended profile follows IPC-J-STD-020D with ramp rate ≤3°C/s and time above 217°C ≤60 seconds.
How does the PNP transistor's VBE(SAT) compare to the NPN's under matched conditions?
At IC = –50 mA / IB = –5.0 mA, PNP VBE(SAT) is –0.85 V to –0.95 V versus NPN's +0.85 V to +0.95 V - confirming symmetrical saturation behavior. This enables balanced drive in complementary emitter-follower or push-pull output stages.
DST3946DPJ-7B 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-7B FAQ
1.How can I place an order for DST3946DPJ-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for DST3946DPJ-7B 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-7B reliable?
The price and inventory of DST3946DPJ-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DST3946DPJ-7B is usually 5 days.
3.What payment methods are accepted for DST3946DPJ-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DST3946DPJ-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DST3946DPJ-7B?
DST3946DPJ-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DST3946DPJ-7B 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-7B?
For technical support, including DST3946DPJ-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DST3946DPJ-7B requirements.
6.How does Aetrix verify that DST3946DPJ-7B is sourced from the original manufacturer or authorized distributors?
All DST3946DPJ-7B 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-7B meets industry standards.
7.What is the process for return or replacement of DST3946DPJ-7B?
All DST3946DPJ-7B units undergo pre-shipment inspection (PSI). If there is an issue with DST3946DPJ-7B, 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-7B part is unused and in its original packaging.
Return procedure for DST3946DPJ-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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