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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi MMBTA13

Name: MMBTA13
Brand: onsemi
SKU: MMBTA13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBTA13

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBTA13.pdf

Description:: TRANS NPN DARL 30V 1.2A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBTA13 from ON Semiconductor is an NPN Darlington transistor in SOT-23 package, designed for high-current-gain switching and amplification up to 1.2 A continuous collector current, with V_CEO = 30 V, h_FE ≥ 5,000 at I_C = 10 mA, and V_CE(sat) ≤ 1.5 V at I_C = 100 mA / I_B = 0.1 mA. It is used in low-voltage relay drivers, LED array controls, and small-signal power interface stages.

For engineers reviewing the MMBTA13 datasheet, pinout, applications, or equivalent options, key selection considerations include its Darlington architecture enabling high DC gain at low base drive, SOT-23 thermal performance (R_θJA = 357 °C/W), 10 V V_EBO rating, and suitability for discrete logic-level interfacing in industrial control modules.

Technical Context

The MMBTA13 integrates two cascaded NPN transistors in a monolithic Darlington configuration, delivering minimum h_FE of 5,000 at I_C = 10 mA and up to 10,000 at I_C = 100 mA, with V_CE(sat) specified under defined forced beta (I_C/I_B = 100). Its breakdown ratings-V_CES = 30 V, V_CBO = 30 V, V_EBO = 10 V-define safe operating limits for low-voltage switching.

Thermal behavior is characterized on FR-4 PCB (1.6" × 1.6" × 0.06"), yielding P_D = 350 mW at T_A = 25°C and derating at 2.8 mW/°C above ambient. Small-signal f_T = 125 MHz at I_C = 10 mA confirms usable bandwidth for moderate-speed digital switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines upper rail limit for switch operation.
I_C (continuous)	1.2 A - Absolute max continuous collector current; sets load-driving capability in relay or solenoid driver designs.
h_FE	5,000–10,000 - DC current gain range at V_CE = 5 V; enables microampere-level base drive for 100 mA+ collector loads.
V_CE(sat)	≤1.5 V @ I_C=100 mA, I_B=0.1 mA - Saturation voltage at forced beta = 100; determines conduction loss and heat generation in on-state.
P_D	350 mW @ 25°C - Total power dissipation limit on standard FR-4; constrains duty cycle and ambient temperature in sealed enclosures.
f_T	125 MHz - Current-gain bandwidth product; supports reliable switching up to ~10–20 MHz with appropriate layout and drive strength.

Pinout & Package

SOT-23 plastic surface-mount package (3-pin, standard lead pitch 0.95 mm), marked "1M", with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives low-current drive signal; Darlington topology reduces required base current by factor of h_FE1 × h_FE2.
2 (Emitter)	Current return path	Connected to ground or common reference; carries full load current plus base current of second transistor.
3 (Collector)	Load-switching output	Switches high-side or low-side loads up to 1.2 A; voltage swing limited by V_CEO = 30 V.

Key Features

Feature	Design Value
Darlington configuration	Monolithic dual-NPN structure delivering h_FE ≥ 5,000 at low I_C, reducing MCU GPIO drive burden in discrete interface circuits.
High V_EBO rating	10 V emitter-base reverse voltage tolerance enables safe operation with floating or pulled-up emitter nodes in level-shifting applications.
SOT-23 thermal resistance	R_θJA = 357 °C/W on FR-4 - quantifies self-heating under sustained load; informs heatsinking need for >200 mA average current.
Low V_CE(sat) at forced beta	1.5 V max at I_C/I_B = 100 - ensures <150 mW conduction loss at 100 mA, critical for thermally constrained PCB layouts.

Applications

Relay Driver Stage	LED Array Switching
Use Scenario: Driving 12 V electromagnetic relays requiring 50–100 mA coil current from 3.3 V or 5 V logic outputs. IC Role / Device Role / Timing Role: Discrete high-gain switch providing galvanic isolation between MCU GPIO and inductive load. Use Value: Eliminates need for external base resistors or auxiliary transistors due to h_FE ≥ 5,000, simplifying BOM and layout.	Use Scenario: Sequencing multi-segment LED displays or high-brightness LED strips in signage and indicator panels. IC Role / Device Role / Timing Role: Low-side current sink controlling up to 1.2 A total LED string current per channel. Use Value: V_CE(sat) ≤ 1.5 V minimizes forward voltage drop and thermal rise versus single-stage BJTs at same current.
Industrial Sensor Interface	Power Supply Enable Control
Use Scenario: Level-shifting and buffering analog sensor outputs or digital alarm signals into PLC input modules. IC Role / Device Role / Timing Role: Signal-conditioning amplifier with high input impedance and current gain for weak-source sensors. Use Value: 10 V V_EBO allows direct connection to ±5 V or 0–10 V industrial signal rails without clamping diodes.	Use Scenario: Enabling/disabling secondary 5 V or 3.3 V rails in multi-rail embedded power systems via microcontroller command. IC Role / Device Role / Timing Role: Low-power-controlled high-current pass element in discrete LDO or buck converter enable paths. Use Value: 350 mW P_D and 30 V V_CEO support reliable 1 A pulsed enable sequencing without thermal shutdown.

Relay Driver Stage

LED Array Switching

Use Scenario: Driving 12 V electromagnetic relays requiring 50–100 mA coil current from 3.3 V or 5 V logic outputs.

IC Role / Device Role / Timing Role: Discrete high-gain switch providing galvanic isolation between MCU GPIO and inductive load.

Use Value: Eliminates need for external base resistors or auxiliary transistors due to h_FE ≥ 5,000, simplifying BOM and layout.

Use Scenario: Sequencing multi-segment LED displays or high-brightness LED strips in signage and indicator panels.

IC Role / Device Role / Timing Role: Low-side current sink controlling up to 1.2 A total LED string current per channel.

Use Value: V_CE(sat) ≤ 1.5 V minimizes forward voltage drop and thermal rise versus single-stage BJTs at same current.

Industrial Sensor Interface

Power Supply Enable Control

Use Scenario: Level-shifting and buffering analog sensor outputs or digital alarm signals into PLC input modules.

IC Role / Device Role / Timing Role: Signal-conditioning amplifier with high input impedance and current gain for weak-source sensors.

Use Value: 10 V V_EBO allows direct connection to ±5 V or 0–10 V industrial signal rails without clamping diodes.

Use Scenario: Enabling/disabling secondary 5 V or 3.3 V rails in multi-rail embedded power systems via microcontroller command.

IC Role / Device Role / Timing Role: Low-power-controlled high-current pass element in discrete LDO or buck converter enable paths.

Use Value: 350 mW P_D and 30 V V_CEO support reliable 1 A pulsed enable sequencing without thermal shutdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBTA14	Same SOT-23 package; higher h_FE min = 10,000 at I_C = 10 mA; identical V_CEO, V_CE(sat), and P_D.	Preferred where tighter gain consistency or lower base drive is required at light loads.	Select MMBTA14 when design requires guaranteed h_FE > 8,000 at I_C ≤ 50 mA.
MPSA14	TO-92 through-hole package; same electrical specs (V_CEO = 30 V, h_FE = 5,000–10,000); R_θJA ≈ 200 °C/W (lower thermal resistance).	Suitable for prototyping, manual assembly, or legacy through-hole designs where board space permits.	Choose MPSA14 for hand-soldered evaluation or when thermal margin exceeds SOT-23 limits.

Compared with MMBTA14 and MPSA14, the MMBTA13 offers optimal balance of SOT-23 footprint, 5,000–10,000 h_FE range, and 350 mW dissipation for automated production of compact industrial interfaces-neither highest gain nor lowest thermal resistance, but best overall fit for cost-sensitive, space-constrained relay and LED drivers.

Availability

MMBTA13 is available at Aetrix Electronics and suitable for industrial relay drivers, LED array controllers, sensor interface modules, and power rail enable circuits requiring stable component supply across long-lifecycle embedded programs.

Supply support for MMBTA13 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMBTA13 belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for robust discrete switching and amplification in cost-sensitive, high-volume industrial control and interface applications.

FAQ

What is the maximum continuous collector current rating for the MMBTA13?

The MMBTA13 has a maximum continuous collector current (I_C) rating of 1.2 A at T_A = 25°C. This value decreases with rising ambient temperature due to its 2.8 mW/°C derating coefficient. Actual usable current depends on PCB copper area, airflow, and duty cycle-designs sustaining >500 mA should verify junction temperature using R_θJA = 357 °C/W.

Does the MMBTA13 have a built-in base-emitter resistor?

No, the MMBTA13 is a bare Darlington pair with no integrated base-emitter resistor. External base resistors must be used to set operating point and ensure stable biasing. Its Darlington structure provides high h_FE (≥5,000), but does not include pull-down or current-limiting resistors found in digital transistors like the MMBT2222A.

Can the MMBTA13 replace the MPSA14 in existing designs?

The MMBTA13 and MPSA14 share identical electrical specifications (V_CEO, h_FE, V_CE(sat), etc.) but differ in package: MMBTA13 uses SOT-23, while MPSA14 uses TO-92. Direct replacement requires PCB redesign. Thermal performance differs-MPSA14 has lower R_θJA (~200 °C/W)-so thermal validation is essential if substituting in high-duty-cycle applications.

What is the typical V_BE(on) of the MMBTA13 at I_C = 100 mA?

The MMBTA13 exhibits a typical V_BE(on) of 2.0 V at I_C = 100 mA and V_CE = 5.0 V. This reflects the series-connected base-emitter junctions of the Darlington pair, resulting in ~1.4 V higher forward voltage than a single NPN transistor-critical for ensuring sufficient base drive voltage in 3.3 V systems.

Is the MMBTA13 suitable for use in automotive applications?

The MMBTA13 is not AEC-Q101 qualified and is not recommended for automotive applications unless fully validated by the end customer. Its specified operating junction temperature range (−55°C to +150°C) meets automotive extremes, but ON Semiconductor does not guarantee automotive-grade reliability, PPAP documentation, or zero-defect screening for this part number.

MMBTA13 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 1.2 A

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 100µA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 10000 @ 100mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: 125MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBTA13 FAQ

1.How can I place an order for MMBTA13 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBTA13 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 MMBTA13 reliable?

The price and inventory of MMBTA13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA13 is usually 5 days.

3.What payment methods are accepted for MMBTA13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBTA13?

MMBTA13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBTA13 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 MMBTA13?

For technical support, including MMBTA13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA13 requirements.

6.How does Aetrix verify that MMBTA13 is sourced from the original manufacturer or authorized distributors?

All MMBTA13 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 MMBTA13 meets industry standards.

7.What is the process for return or replacement of MMBTA13?

All MMBTA13 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA13, 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 MMBTA13 part is unused and in its original packaging.

Return procedure for MMBTA13:

1.Submit a request within 90 days.

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

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