Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar Transistor Arrays

Diodes Incorporated MMDT4126-7-F

Name: MMDT4126-7-F
Brand: Diodes Incorporated
SKU: MMDT4126-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MMDT4126-7-F

Manufacturer:: Diodes Incorporated

Category:: Bipolar Transistor Arrays

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: MMDT4126-7-F.pdf

Description:: TRANS 2PNP 25V 200MA SOT-363

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,681

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MMDT4126-7-F from Diodes Incorporated is a dual PNP small-signal surface-mount transistor in SOT-363 package, rated for -25 V V_CEO, -200 mA I_C, and 200 mW P_D, with h_FE = 120–360 at I_C = -2 mA and f_T = 250 MHz - used in medium-power switching and amplification stages of portable audio bias networks and LED driver current sinks.

For engineers reviewing the MMDT4126-7-F datasheet, MMDT4126-7-F pinout, MMDT4126-7-F application, or MMDT4126-7-F equivalent, key selection criteria include verified dual-PNP matching, low V_CE(SAT) (-0.40 V @ -50 mA), thermal resistance (R_JA = 625 K/W), lead-free compliance, and SOT-363 footprint compatibility with space-constrained PCB layouts.

Technical Context

This device integrates two matched PNP epitaxial planar transistors on a single die, sharing common emitter connections per channel and enabling complementary operation with NPN counterparts like MMDT4124. Its construction supports stable DC gain across -55°C to +150°C ambient range.

Designed for low-voltage, medium-current analog and digital switching, it delivers consistent h_FE performance under V_CE = -1.0 V bias and exhibits 4.5 pF C_obo and 10 pF C_ibo at specified test conditions - critical for high-frequency stability in oscillator and RF detector front-ends.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-25 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (max)	-200 mA - continuous collector current limit defining switching load capacity
P_D	200 mW - total power dissipation limit on FR-4 PCB with specified pad layout
h_FE	120–360 - DC current gain range at I_C = -2 mA, enabling predictable base drive sizing
f_T	250 MHz - transition frequency confirming usable bandwidth up to VHF band
R_JA	625 K/W - junction-to-ambient thermal resistance under JEDEC-standard board conditions
NF	4.0 dB - noise figure at 1 kHz, relevant for low-noise preamplifier stages

Pinout & Package

Package: SOT-363 - ultra-small surface-mount plastic case (UL 94V-0), 0.006 g weight, moisture sensitivity Level 1, lead-free matte tin plating.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter of Transistor 1	Common emitter connection point for first PNP element; tied to ground or reference rail
2	Base of Transistor 1	Control input for first transistor; requires current-limited drive to avoid saturation overshoot
3	Collector of Transistor 1	Output node for first transistor; sinks current when active, compatible with 3.3 V logic loads
4	Collector of Transistor 2	Output node for second transistor; electrically isolated from Pin 3 but thermally coupled on shared die
5	Base of Transistor 2	Independent control input for second transistor; enables dual-channel synchronous switching
6	Emitter of Transistor 2	Common emitter connection for second PNP; may be tied separately or paralleled with Pin 1

Key Features

Feature	Design Value
Dual matched PNP topology	Enables compact push-pull or differential pair implementation without discrete pairing tolerance drift
V_CE(SAT) = -0.40 V @ -50 mA	Minimizes conduction loss in battery-powered switch-mode regulators and LED current sinks
h_FE min = 120 @ -2 mA	Ensures reliable turn-on margin with standard GPIO base drive in microcontroller interfaces
f_T = 250 MHz	Supports stable operation in 10–50 MHz oscillator feedback loops and RF detector circuits
Lead-free & RoHS-compliant	Meets IPC-J-STD-020A Level 1 moisture sensitivity and global environmental compliance requirements

Applications

Portable Audio Bias Networks

LED Driver Current Sinks

Use Scenario: Biasing Class-AB output stages in handheld speaker amplifiers with 3.3 V supply rails.

IC Role / Device Role / Timing Role: Dual PNP provides matched emitter-follower current sources for quiescent current stabilization.

Use Value: Tight h_FE matching minimizes crossover distortion; low V_CE(SAT) preserves headroom in low-voltage designs.

Use Scenario: Constant-current sinking for RGB LED strings in smart lighting modules.

IC Role / Device Role / Timing Role: Each PNP acts as a linear current sink controlled by PWM-modulated base voltage.

Use Value: 200 mA rating supports multi-LED chains; thermal resistance allows operation at 60°C ambient without derating.

Low-Voltage Logic Level Shifters

DC-DC Converter Feedback Sensing

Use Scenario: Bidirectional level translation between 1.8 V MCU I/O and 3.3 V peripheral buses.

IC Role / Device Role / Timing Role: Dual PNP configured as open-collector translators with pull-up resistors.

Use Value: Fast f_T ensures sub-100 ns propagation; matched gain maintains symmetry across both directions.

Use Scenario: Precision current sensing in buck converter error amplifier feedback paths.

IC Role / Device Role / Timing Role: PNP transistor buffers reference voltage into high-impedance op-amp inputs.

Use Value: Low NF (4.0 dB) reduces measurement uncertainty; C_ibo = 10 pF avoids phase shift in compensation networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-PNP small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMT3016LSDQ-7	Higher V_CEO (-30 V), lower h_FE (min 85), SOT-563 package (smaller footprint)	Better suited for 5 V rail systems requiring higher breakdown margin	Select when board space is constrained and V_CEO > 25 V is required
BC846BPDW1T3G	Same SOT-363, but NPN/PNP complementary pair; h_FE tighter (200–450), higher f_T (300 MHz)	Enables true complementary switching without external NPN pairing	Choose when designing push-pull drivers needing matched NPN+PNP characteristics

Compared with MMDT4126-7-F, DMT3016LSDQ-7 trades gain for voltage headroom and size reduction, while BC846BPDW1T3G offers complementary topology at higher frequency - making the latter ideal for symmetrical signal paths and the former for compact 3.3 V systems demanding robustness.

Availability

MMDT4126-7-F is available at Aetrix Electronics and suitable for portable audio bias networks, LED driver current sinks, low-voltage logic level shifters, and DC-DC converter feedback sensing requiring stable component supply across production volumes.

Supply support for MMDT4126-7-F 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, cost-optimized components for consumer, industrial, and computing markets.

The MMDT4126-7-F belongs to Diodes' small-signal transistor product line, engineered for space-efficient, thermally robust switching and amplification in battery-powered and thermally sensitive applications.

FAQ

What is the marking code for MMDT4126-7-F?

The top-side marking is "K2B", followed by a two-character date code (e.g., "YM" for September 2002). This matches Diodes Inc.'s standardized SOT-363 marking convention documented in DS30160 Rev. 6, Page 2. The "K2B" identifier is unique to the MMDT4126 device family and confirms dual-PNP functionality.

Can MMDT4126-7-F replace a single discrete PNP transistor?

No - MMDT4126-7-F contains two independent PNP transistors in one SOT-363 package and cannot substitute for a single-transistor device without circuit redesign. Its value lies in dual-channel integration: both transistors share thermal coupling but have separate base/collector/emitter terminals, enabling matched-pair functions not achievable with singles.

Is thermal derating required above 25°C ambient?

Yes - the 200 mW power rating applies only at T_A = 25°C. Derating follows the linear curve in Figure 1 of DS30160: power must be reduced by 0.32 mW/°C above 25°C, reaching zero at ~175°C. At 60°C ambient, max allowable P_D is ~88 mW, confirmed by R_JA = 625 K/W and T_J(max) = 150°C.

Does MMDT4126-7-F support automotive temperature range?

No - its specified operating temperature range is -55°C to +150°C, but Diodes Inc. does not qualify this part for AEC-Q101 automotive stress testing. It is intended for industrial and commercial applications. For automotive use, consider Diodes' AEC-Q101-qualified dual transistors such as DMMT3906W-7-F, which shares SOT-363 packaging but includes full qualification documentation.

MMDT4126-7-F 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-F FAQ

1.How can I place an order for MMDT4126-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMDT4126-7-F 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-F reliable?

The price and inventory of MMDT4126-7-F 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-F is usually 5 days.

3.What payment methods are accepted for MMDT4126-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMDT4126-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMDT4126-7-F?

MMDT4126-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMDT4126-7-F 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-F?

For technical support, including MMDT4126-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMDT4126-7-F requirements.

6.How does Aetrix verify that MMDT4126-7-F is sourced from the original manufacturer or authorized distributors?

All MMDT4126-7-F 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-F meets industry standards.

7.What is the process for return or replacement of MMDT4126-7-F?

All MMDT4126-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMDT4126-7-F, 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-F part is unused and in its original packaging.

Return procedure for MMDT4126-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…