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Diodes Incorporated MMDT4126-7
- Part No.:
- MMDT4126-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MMDT4126-7.pdf
- Description:
- TRANS 2PNP 25V 200MA SOT-363
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMDT4126-7 from Diodes Incorporated is a dual PNP small-signal surface-mount transistor in SOT-363 package, rated for VCEO = −25 V, IC = −200 mA, and PD = 200 mW, with hFE = 120–360 at IC = −2.0 mA and VCE = −1.0 V, used in medium-power switching and amplification circuits in portable audio and power management modules.
For engineers reviewing the MMDT4126-7 datasheet, MMDT4126-7 pinout, MMDT4126-7 application, or MMDT4126-7 equivalent, key selection criteria include verified dual-PNP configuration, SOT-363 thermal resistance (RJA = 625 K/W), VBE(SAT) = −0.95 V at IC = −50 mA/IB = −5.0 mA, fT = 250 MHz, and lead-free plating compatibility.
Technical Context
This device integrates two matched PNP transistors on a single epitaxial planar die, enabling compact dual-channel biasing or complementary push-pull stages. Its construction supports stable hFE across −55°C to +150°C and low Cibo = 10 pF / Cobo = 4.5 pF for RF-critical signal routing.
Designed for surface-mount assembly on FR-4 PCBs per AP02001 pad layout, it delivers defined saturation behavior (VCE(SAT) ≤ −0.40 V) under IC/IB = 10, with noise figure NF = 4.0 dB at VCE = −5.0 V, IC = −100 µA, and RS = 1.0 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −25 V: Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (cont.) | −200 mA: Continuous DC collector current rating defining medium-power switching capability. |
| PD | 200 mW: Total power dissipation limit on standard FR-4 board, constraining thermal design margin. |
| hFE | 120–360: DC current gain range at IC = −2.0 mA, enabling predictable base drive sizing. |
| fT | 250 MHz: Transition frequency confirming usable bandwidth up to VHF range in amplifier stages. |
| RJA | 625 K/W: Junction-to-ambient thermal resistance under specified PCB layout, critical for derating. |
| NF | 4.0 dB: Noise figure at 1 kHz, indicating suitability for low-noise preamplifier input stages. |
Pinout & Package
Package: SOT-363 - ultra-small surface-mount plastic case (UL 94V-0), 6-pin, dual-transistor configuration with common-emitter topology per channel; moisture sensitivity level 1 per J-STD-020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter 1) | Emitter of first PNP transistor | Current sink node for Channel 1; tied to local ground reference in switch applications. |
| 2 (Base 1) | Base control terminal for first transistor | Accepts negative bias current to enable conduction; requires series resistor for current limiting. |
| 3 (Collector 1) | Collector of first PNP transistor | Output node carrying load current; connected to positive rail via pull-up in active-low logic. |
| 4 (Emitter 2) | Emitter of second PNP transistor | Independent emitter node allowing separate biasing or shared emitter configuration. |
| 5 (Base 2) | Base control terminal for second transistor | Enables independent or mirrored drive of Channel 2; supports differential pair implementation. |
| 6 (Collector 2) | Collector of second PNP transistor | Second output node; enables dual-load switching or complementary stage pairing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual PNP monolithic structure | Two matched transistors on one die reduce layout area by >40% vs. discrete SOT-23 pairs. |
| Lead-free terminal finish | Matte tin plating compliant with RoHS and JEDEC J-STD-020A level-1 reflow requirements. |
| Low VBE(SAT) | −0.95 V at IC/IB = 10 ensures minimal base drive power loss in high-duty-cycle switching. |
| High fT | 250 MHz enables stable gain in 10–50 MHz oscillator and RF buffer designs without external compensation. |
| Wide Tj range | −55°C to +150°C operation supports automotive cabin and industrial motor-control ambient conditions. |
Applications
| Portable Audio Amplifiers | DC-DC Converter Bias Circuits |
|---|---|
Use Scenario: Driving headphone output stage in battery-powered MP3 players with <100 mW output. IC Role / Device Role / Timing Role: Dual-PNP configured as Class AB push-pull emitter follower for low-distortion analog output. Use Value: Matched hFE and VBE(SAT) minimize crossover distortion; SOT-363 footprint saves >3 mm² vs. dual-SOT-23. | Use Scenario: Providing precise reference current to error amplifier in 3.3 V buck converter for IoT sensors. IC Role / Device Role / Timing Role: PNP current mirror input stage setting feedback loop bias current. Use Value: Stable hFE over temperature ensures ±2% reference current accuracy from −40°C to +85°C. |
| LED Driver Switches | Industrial PLC Input Isolation |
Use Scenario: Switching 20 mA white LEDs in smart lighting modules with PWM dimming. IC Role / Device Role / Timing Role: Low-VCE(SAT) PNP switch controlling cathode-side LED current path. Use Value: VCE(SAT) ≤ −0.40 V at 50 mA reduces conduction loss by 35% vs. generic PNP alternatives. | Use Scenario: Level-shifting and isolating 24 V digital inputs in factory automation controllers. IC Role / Device Role / Timing Role: Dual-PNP configured as optocoupler output stage for sinking 5 V logic signals. Use Value: Dual-channel integration eliminates inter-channel skew; RJA = 625 K/W allows operation at 70°C ambient without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-PNP switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMT3016LW-7 | Same SOT-363 package, but NPN+PNP complementary pair; hFE min = 100, fT = 150 MHz. | Supports complementary push-pull output stages; not suitable for dual-PNP-only topologies. | Select when designing CMOS-like driver stages requiring matched NPN/PNP characteristics. |
| MMDT3906-7 | Same dual-PNP topology, but VCEO = −40 V, IC = −200 mA, hFE = 100–300, RJA = 625 K/W. | Higher breakdown voltage enables use in 36 V industrial bus interfaces where −25 V is insufficient. | Choose for systems requiring extended voltage margin without changing PCB layout or thermal design. |
Compared with MMDT4126-7, DMT3016LW-7 offers complementary polarity for push-pull drivers but sacrifices PNP-only matching, while MMDT3906-7 trades higher VCEO for slightly lower hFE range-both retain SOT-363 compatibility and thermal performance.
Availability
MMDT4126-7 is available at Aetrix Electronics and suitable for portable audio amplifiers, DC-DC converter bias circuits, and LED driver switches requiring stable component supply with lead-free compliance and tight parametric matching.
Supply support for MMDT4126-7 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 Malaysia.
The MMDT4126-7 belongs to Diodes' small-signal transistor product line, engineered specifically for space-constrained, medium-power analog and switching functions in consumer, computing, and industrial end-equipment.
FAQ
What is the maximum operating temperature for MMDT4126-7?
The MMDT4126-7 is rated for junction and storage temperatures from −55°C to +150°C. Its thermal resistance RJA = 625 K/W applies to the recommended AP02001 FR-4 PCB layout; derating is required above +70°C ambient to maintain safe junction temperature.
Is MMDT4126-7 pin-compatible with MMDT4124-7?
No-MMDT4124-7 is the complementary dual-NPN version in identical SOT-363 packaging, with reversed pin assignments: pins 1/2/3 correspond to E/B/C of NPN1, and pins 4/5/6 to E/B/C of NPN2. Direct substitution would invert logic polarity and cause circuit failure.
Does MMDT4126-7 support reflow soldering per JEDEC standards?
Yes-MMDT4126-7 has moisture sensitivity level 1 per J-STD-020A and is qualified for lead-free reflow profiles including peak temperatures up to 260°C. The matte tin finish ensures reliable wetting and intermetallic formation during standard Pb-free assembly processes.
How is the marking "K2B" decoded on MMDT4126-7 devices?
"K2B" is the product type marking code printed on the top surface. Per Diodes' documentation, "K2B" uniquely identifies the MMDT4126-7 die and package combination; date codes (e.g., "YM") follow separately and indicate year/month of manufacture using the mapping provided in DS30160 Rev. 6.
MMDT4126-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- 2 PNP (Dual)
- Current - Collector (Ic) (Max):
- 200mA
- Voltage - Collector Emitter Breakdown (Max):
- 25V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 2mA, 1V
- Power - Max:
- 200mW
- Frequency - Transition:
- 250MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
MMDT4126-7 FAQ
1.How can I place an order for MMDT4126-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMDT4126-7 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 MMDT4126-7 reliable?
The price and inventory of MMDT4126-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMDT4126-7 is usually 5 days.
3.What payment methods are accepted for MMDT4126-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMDT4126-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMDT4126-7?
MMDT4126-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMDT4126-7 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 MMDT4126-7?
For technical support, including MMDT4126-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMDT4126-7 requirements.
6.How does Aetrix verify that MMDT4126-7 is sourced from the original manufacturer or authorized distributors?
All MMDT4126-7 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 MMDT4126-7 meets industry standards.
7.What is the process for return or replacement of MMDT4126-7?
All MMDT4126-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMDT4126-7, 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 MMDT4126-7 part is unused and in its original packaging.
Return procedure for MMDT4126-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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