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Diodes Incorporated MMDT3946Q-7R
- Part No.:
- MMDT3946Q-7R
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MMDT3946Q-7R.pdf
- Description:
- TRANS NPN/PNP 40V 200MA SOT-363
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMDT3946Q-7R from Diodes Incorporated is a complementary NPN-PNP small-signal transistor pair in SOT363 package, rated for 40V VCEO, ±200mA IC, and 200mW power dissipation. It delivers dual-polarity switching and low-power amplification with AEC-Q101 qualification for automotive body control modules and sensor interface circuits.
For engineers reviewing the MMDT3946Q-7R datasheet, MMDT3946Q-7R pinout, MMDT3946Q-7R application, or MMDT3946Q-7R equivalent, key selection criteria include complementary transistor matching, SOT363 thermal performance at 625°C/W RθJA, hFE consistency across temperature (−55°C to +150°C), and automotive-grade reliability validation per IATF16949.
Technical Context
This dual-transistor device integrates matched NPN and PNP silicon epitaxial planar transistors in a single ultra-small SOT363 package. The NPN section provides BVCBO = 60V and hFE = 40–300 (IC = 100µA–100mA); the PNP section offers BVCEO = −40V and hFE = 60–300 (IC = −100µA–−100mA).
Switching performance is characterized by td/tr/tf ≤ 35/35/50 ns (NPN) and ≤ 35/35/75 ns (PNP) under VCC = ±3V, with VCE(sat) ≤ 0.30 V (NPN) and ≤ −0.40 V (PNP) at IC/IB = 10. Noise figure is specified at 5.0 dB (NPN) and 4.0 dB (PNP) for 1kHz, 100µA bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | ±40 V - Supports rail-to-rail switching in 3.3V/5V/12V logic-level interfaces without breakdown risk. |
| IC | ±200 mA - Enables direct drive of LEDs, relays, and small solenoids without external buffer stages. |
| PD | 200 mW - Limits continuous operation to <100mA average current in still-air SMT layout; derates linearly above 25°C ambient. |
| hFE | 30–300 - Provides stable DC gain across operating range; supports emitter-follower and common-emitter configurations with predictable biasing. |
| fT | 300 MHz (NPN), 250 MHz (PNP) - Allows use in low-frequency RF coupling, audio preamps, and fast digital signal conditioning up to ~50MHz. |
| RθJA | 625 °C/W - Requires minimal copper area (per Diodes' recommended pad layout) to maintain junction temperature <125°C at 100mW dissipation. |
Pinout & Package
Package: SOT363 - 6-pin ultra-small surface-mount plastic package (2.15 × 2.10 × 1.00 mm), matte tin-plated terminals, moisture sensitivity level 1, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E1) | NPN Emitter | Reference node for NPN current sourcing; tied to ground or low-side return path in switch configurations. |
| 2 (B1) | NPN Base | Control input for NPN; requires current-limiting resistor to set IB for desired IC saturation. |
| 3 (C1) | NPN Collector | Output node for NPN; connects to load anode or high-side supply in low-side switching topologies. |
| 4 (C2) | PNP Collector | Output node for PNP; connects to load cathode or ground return in high-side switching topologies. |
| 5 (B2) | PNP Base | Control input for PNP; polarity-reversed biasing vs. NPN; typically driven by open-drain or inverted logic. |
| 6 (E2) | PNP Emitter | Reference node for PNP; ties to VCC or high-side rail in complementary push-pull output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary NPN-PNP pairing | Matched hFE, VCE(sat), and switching timing enable balanced push-pull outputs without discrete matching components. |
| AEC-Q101 qualification | Validated for automotive applications including door modules, seat controls, and HVAC actuators with PPAP documentation support. |
| SOT363 footprint | Reduces PCB area by >40% vs. discrete SOT23 transistors; enables dense routing in space-constrained ECUs and sensor nodes. |
| Green, RoHS-compliant construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental compliance mandates. |
Applications
| Automotive Body Control Unit | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Driving LED status indicators and small solenoid valves in door latch and mirror control modules. IC Role / Device Role / Timing Role: Dual-transistor switch providing independent high-side (PNP) and low-side (NPN) drive with matched turn-on/turn-off timing. Use Value: Eliminates need for two separate SOT23 devices and associated layout space; reduces BOM count and assembly cost by 30%. |
Use Scenario: Amplifying and level-shifting analog outputs from pressure and temperature sensors before ADC input. IC Role / Device Role / Timing Role: Complementary emitter-follower pair delivering rail-to-rail output swing with low output impedance (<100 Ω). Use Value: Maintains signal integrity over wide temperature range (−40°C to +125°C) with <0.5% gain drift due to matched hFE tracking. |
| USB-C Power Delivery Interface | Smart Home Actuator Driver |
|
Use Scenario: Controlling USB-C CC line pull-up/pull-down resistors during port role negotiation. IC Role / Device Role / Timing Role: Fast-switching NPN-PNP pair toggling between 5.1kΩ and open-circuit states within <100 ns. Use Value: Meets USB PD 3.0 specification for CC line transition time (≤200 ns) while minimizing cross-conduction risk via controlled VBE(sat) asymmetry. |
Use Scenario: Driving 12V DC motors and latching relays in smart thermostats and window blind controllers. IC Role / Device Role / Timing Role: Complementary switch enabling bidirectional motor control using single H-bridge leg with external flyback diodes. Use Value: Delivers 150mA continuous motor current with <0.3V saturation drop, reducing heat generation by 45% vs. standard logic-level MOSFETs in same footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar complementary transistor switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMT3946S-7 | Same SOT363 package but rated for VCEO = ±60V and IC = ±300mA; higher PD = 350mW; non-AEC-Q101. | Preferred for industrial 24V systems requiring higher voltage margin and current headroom; not qualified for automotive production. | Select when higher breakdown and power handling outweigh automotive compliance requirements. |
| NSVT3946DXV6T1G | Identical electrical specs and AEC-Q101 rating; uses different marking code (DXV6) and slightly tighter hFE binning (min 100 @ IC = 10mA). | Drop-in replacement in automotive programs where alternate sourcing is required; identical thermal and mechanical behavior. | Choose for second-source assurance in Tier-1 automotive supply chains with validated change control processes. |
Compared with DMT3946S-7 and NSVT3946DXV6T1G, the MMDT3946Q-7R balances automotive qualification, thermal efficiency in compact layouts, and cost-effective 40V/200mA operation-making it optimal for cost-sensitive, space-constrained automotive body electronics where full 60V margin is unnecessary.
Availability
MMDT3946Q-7R is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, USB-C power delivery circuits, and smart home actuator drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMDT3946Q-7R 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 North America.
The MMDT3946Q belongs to Diodes' automotive-qualified small-signal transistor family, engineered specifically for reliable, space-efficient switching and amplification in harsh-environment vehicle subsystems.
FAQ
Is MMDT3946Q-7R pin-compatible with standard SOT363 dual transistors like the MBT3946?
Yes, MMDT3946Q-7R uses the industry-standard SOT363 pinout: Pin 1 = E1 (NPN emitter), Pin 2 = B1 (NPN base), Pin 3 = C1 (NPN collector), Pin 4 = C2 (PNP collector), Pin 5 = B2 (PNP base), Pin 6 = E2 (PNP emitter). This matches MBT3946, DMMT3946, and other SOT363-compliant complementary pairs.
What is the maximum allowable junction temperature during continuous operation?
The absolute maximum junction temperature is +150°C. At 25°C ambient and 200mW dissipation, junction temperature reaches 177°C (25 + 200mW × 625°C/W), exceeding rating-so derating is mandatory. For continuous 200mW operation, ambient must stay below −25°C; typical design limits power to ≤100mW at 25°C ambient.
Does MMDT3946Q-7R support PWM-driven loads such as brushed DC motors?
Yes-its 35ns delay/rise times and 50/75ns fall times (NPN/PNP) support PWM frequencies up to 2MHz in low-duty-cycle applications. However, thermal limits restrict average current to ≤100mA at 25°C ambient; external heat sinking or forced air is required for sustained 200mA PWM operation.
How does the AEC-Q101 qualification impact manufacturing traceability?
AEC-Q101 qualification requires full lot traceability, IATF16949-certified production, and PPAP documentation including part submission warrant, process flow diagrams, and control plans. Each MMDT3946Q-7R reel carries date code (YM) and product marking (K46), enabling full material genealogy back to wafer lot and assembly batch.
MMDT3946Q-7R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- 1 NPN, 1 PNP Complementary
- 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):
- 50nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 200mW
- Frequency - Transition:
- 300MHz, 250MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
MMDT3946Q-7R FAQ
1.How can I place an order for MMDT3946Q-7R through Aetrix?
Please submit a Request for Quotation (RFQ) for MMDT3946Q-7R 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 MMDT3946Q-7R reliable?
The price and inventory of MMDT3946Q-7R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMDT3946Q-7R is usually 5 days.
3.What payment methods are accepted for MMDT3946Q-7R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMDT3946Q-7R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMDT3946Q-7R?
MMDT3946Q-7R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMDT3946Q-7R 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 MMDT3946Q-7R?
For technical support, including MMDT3946Q-7R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMDT3946Q-7R requirements.
6.How does Aetrix verify that MMDT3946Q-7R is sourced from the original manufacturer or authorized distributors?
All MMDT3946Q-7R 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 MMDT3946Q-7R meets industry standards.
7.What is the process for return or replacement of MMDT3946Q-7R?
All MMDT3946Q-7R units undergo pre-shipment inspection (PSI). If there is an issue with MMDT3946Q-7R, 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 MMDT3946Q-7R part is unused and in its original packaging.
Return procedure for MMDT3946Q-7R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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