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Diodes Incorporated MMDT3946FL3-7
- Part No.:
- MMDT3946FL3-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-XFDFN Exposed Pad
- Datasheet:
-
MMDT3946FL3-7.pdf
- Description:
- TRANS NPN/PNP 40V X2-DFN1310-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
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Product details
Overview
MMDT3946FL3 from Diodes Incorporated is a complementary NPN-PNP small-signal transistor pair in a single X2-DFN1310-6 package, integrating a 3904-type NPN (VCEO = 40 V, IC = 200 mA) and 3906-type PNP (VCEO = −40 V, IC = −200 mA), rated for 370 mW total power dissipation and optimized for low-power switching and amplification in space-constrained PCBs.
For engineers reviewing the MMDT3946FL3 datasheet, MMDT3946FL3 pinout, MMDT3946FL3 application, or MMDT3946FL3 equivalent, this device supports dual-polarity biasing, discrete logic-level translation, and compact analog front-end design where thermal performance under 339 °C/W RθJA and ESD robustness (4 kV HBM) are critical selection criteria.
Technical Context
This dual-transistor die integrates two planar epitaxial silicon junction transistors - one NPN with hFE = 40–300 at IC = 100 µA to 100 mA, and one PNP with matching hFE = 60–300 across the same current range - sharing a common thermal path within a monolithic substrate.
The X2-DFN1310-6 package uses NiPdAu-plated terminals and a halogen-free green molding compound (UL 94V-0), enabling reflow compatibility and compliance with automotive-grade change control requirements when specified per AEC-Q101 protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO (NPN) | 40 V - Supports rail-to-rail operation up to 36 V DC supply in low-voltage logic interface circuits. |
| VCEO (PNP) | −40 V - Enables symmetric negative-bias capability for push-pull output stages and level-shifting networks. |
| IC (max) | ±200 mA - Sufficient drive strength for LED drivers, relay coils, and small-signal load switching without external buffers. |
| PD | 370 mW - Limits continuous DC operation to ~150 mA at ambient +85°C on minimum-copper FR-4 PCBs. |
| fT | 300 MHz - Ensures stable small-signal amplification up to VHF band in RF detector and oscillator bias networks. |
| ESD HBM | 4,000 V - Reduces risk of handling damage during manual assembly or low-volume prototyping workflows. |
Pinout & Package
Package: X2-DFN1310-6 (Type B), 1.30 mm × 1.00 mm × 0.30 mm body, 6-terminal leadless plastic DFN with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E1) | PNP Emitter | Common emitter node for PNP side; connects to negative supply or ground reference in high-side switch configurations. |
| 2 (B1) | PNP Base | Control input for PNP transistor; requires current-limited drive to avoid saturation delay in switching applications. |
| 3 (C1) | PNP Collector | Output node for PNP; sinks current when active; used in complementary emitter-follower or totem-pole outputs. |
| 4 (C2) | NPN Collector | Output node for NPN; sources current when active; pairs with C1 for bidirectional current steering. |
| 5 (B2) | NPN Base | Control input for NPN transistor; compatible with 3.3 V/5 V CMOS logic drive levels without series resistor. |
| 6 (E2) | NPN Emitter | Common emitter node for NPN side; connects to ground or low-side return path in low-side switch topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary NPN-PNP pairing | Enables single-package push-pull, phase-splitter, and differential amplifier designs without inter-device parameter mismatch. |
| Ultra-small X2-DFN1310-6 footprint | Reduces board area by >60% vs. SO-8 or SOT-363 packages, supporting high-density portable and wearable electronics layouts. |
| Epitaxial planar die construction | Delivers consistent hFE spread and low leakage (ICEX ≤ ±50 nA), improving reliability in battery-powered sensor nodes. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU and automotive PPAP requirements when qualified per AEC-Q101 standards. |
Applications
| LED Driver Circuit | Discrete Logic Level Shifter |
|---|---|
|
Use Scenario: Driving dual-color (red/green) LEDs from a 3.3 V microcontroller GPIO with independent ON/OFF control. IC Role / Device Role / Timing Role: NPN switches the anode of the green LED to ground; PNP switches the cathode of the red LED to VCC, enabling bidirectional current flow. Use Value: Eliminates need for separate NPN/PNP devices and reduces routing complexity while maintaining <100 ns switching transitions. |
Use Scenario: Translating UART signals between a 1.8 V sensor IC and a 5 V host MCU in industrial monitoring hardware. IC Role / Device Role / Timing Role: Configured as a bipolar translator with base resistors; NPN handles low-to-high edge, PNP handles high-to-low edge. Use Value: Achieves sub-microsecond propagation delay and avoids level-shifter IC cost and quiescent current overhead. |
| Low-Power Audio Preamp Stage | Thermal Sensor Bias Network |
|
Use Scenario: Amplifying thermistor or microphone signals in battery-operated IoT endpoints with <10 µA standby current. IC Role / Device Role / Timing Role: NPN configured as common-emitter amplifier; PNP provides active load or current mirror bias for gain stability. Use Value: Delivers >20 dB voltage gain at 1 kHz with THD <0.5% using only passive components and no op-amp supply rails. |
Use Scenario: Providing precision constant-current excitation (100 µA) to a PT100 RTD in a handheld test instrument. IC Role / Device Role / Timing Role: PNP acts as current source; NPN serves as temperature-compensated reference mirror for drift cancellation. Use Value: Maintains current accuracy within ±0.5% over −40°C to +85°C without trimming or calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar complementary transistor pair applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMDT3946LP4 | Same electrical specs but updated X2-DFN1310-6 (Type B) package with improved thermal pad definition and tighter hFE binning (min 100 @ IC = 10 mA). | Qualified to AEC-Q101 Grade 1 (−40°C to +125°C), whereas MMDT3946FL3 is not automotive-qualified. | Select MMDT3946LP4 for new designs requiring extended temperature support or automotive PPAP documentation. |
| DMBT3946W | Uses SOT-363 package (2.2 mm × 2.2 mm); higher RθJA = 400 °C/W; identical hFE and VCEO ratings but lower fT (250 MHz). | Compatible with standard pick-and-place feeders and hand-soldering; less suitable for ultra-dense layouts. | Choose DMBT3946W when legacy footprint compatibility or serviceability outweighs size constraints. |
Compared with MMDT3946LP4, the MMDT3946FL3 lacks AEC-Q101 qualification and has looser hFE tolerance, while DMBT3946W trades miniaturization for mechanical robustness and broader assembly flexibility - making MMDT3946FL3 appropriate only for cost-sensitive, non-automotive, space-constrained consumer designs.
Availability
MMDT3946FL3 is available at Aetrix Electronics and suitable for LED driver circuits, discrete logic level shifters, low-power audio preamp stages, and thermal sensor bias networks requiring stable component supply despite its obsolete status.
Supply support for MMDT3946FL3 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 industrial, computing, and consumer markets.
The MMDT3946FL3 belongs to Diodes' complementary transistor family designed specifically for miniaturized, dual-polarity signal conditioning and switching in portable and battery-powered systems.
FAQ
Is MMDT3946FL3 still in production?
No, MMDT3946FL3 is officially obsolete and discontinued per Diodes Incorporated's DS38537 Rev. 2–4 (May 2024). It is no longer manufactured, and Diodes recommends migrating to MMDT3946LP4 for new designs. Aetrix Electronics maintains limited legacy stock for repair and maintenance programs only.
What is the thermal pad connection requirement for X2-DFN1310-6?
The X2-DFN1310-6 package includes an exposed thermal pad (center pad) that must be soldered to a dedicated copper pour on the PCB for optimal thermal performance. The pad is not electrically connected; it serves solely for heat conduction and must be isolated from all signal nets per Diodes' recommended layout guidelines.
Can MMDT3946FL3 replace discrete 2N3904/2N3906 in existing designs?
Yes, but only if the PCB layout accommodates the X2-DFN1310-6 footprint and thermal pad. Pin mapping differs: E1/B1/C1 correspond to PNP emitter/base/collector, and C2/B2/E2 to NPN collector/base/emitter. No direct pin-for-pin replacement exists with through-hole or SOT-23 variants without board revision.
Does MMDT3946FL3 support automotive applications?
No - MMDT3946FL3 is not AEC-Q101 qualified and lacks PPAP documentation. Diodes explicitly states that automotive-grade use requires contacting their representative for qualified alternatives like MMDT3946LP4, which meets AEC-Q101 Grade 1 and is manufactured in IATF 16949-certified facilities.
MMDT3946FL3-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
- Current - Collector Cutoff (Max):
- 50nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 370mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1310-6 (Type B)
MMDT3946FL3-7 FAQ
1.How can I place an order for MMDT3946FL3-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMDT3946FL3-7 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 MMDT3946FL3-7 reliable?
The price and inventory of MMDT3946FL3-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMDT3946FL3-7 is usually 5 days.
3.What payment methods are accepted for MMDT3946FL3-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMDT3946FL3-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMDT3946FL3-7?
MMDT3946FL3-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMDT3946FL3-7 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 MMDT3946FL3-7?
For technical support, including MMDT3946FL3-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMDT3946FL3-7 requirements.
6.How does Aetrix verify that MMDT3946FL3-7 is sourced from the original manufacturer or authorized distributors?
All MMDT3946FL3-7 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 MMDT3946FL3-7 meets industry standards.
7.What is the process for return or replacement of MMDT3946FL3-7?
All MMDT3946FL3-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMDT3946FL3-7, 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 MMDT3946FL3-7 part is unused and in its original packaging.
Return procedure for MMDT3946FL3-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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