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

onsemi SMMBTA06WT3G

Name: SMMBTA06WT3G
Brand: onsemi
SKU: SMMBTA06WT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMMBTA06WT3G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: SMMBTA06WT3G.pdf

Description:: TRANS NPN 80V 0.5A SC70-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMMBTA06WT3G from onsemi is an NPN silicon small-signal transistor in SC-70 (SOT-323) package, rated for 80 V_CEO, 500 mA continuous collector current, and 460 mW power dissipation at T_A = 25°C. It delivers h_FE ≥ 100 at I_C = 10 mA, V_CE = 1.0 V, and f_T = 100 MHz, supporting high-speed switching in automotive signal conditioning and industrial interface circuits.

For engineers reviewing the SMMBTA06WT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, 4 kV HBM ESD rating, 100 MHz f_T, low V_CE(sat) ≤ 0.25 V at I_C/I_B = 10, and Pb-free SC-70 footprint compatibility with space-constrained PCB layouts.

Technical Context

This NPN transistor operates in active and saturation regions with defined safe operating area (SOA) limits up to 80 V and 500 mA under pulsed conditions. Its thermal resistance R_JA = 272°C/W on FR-5 board enables stable operation in ambient temperatures from −55°C to +150°C.

The device features a fixed three-terminal structure (Base–Emitter–Collector), with verified V_(BR)CEO = 80 V, V_BE(on) ≤ 1.2 V at I_C = 100 mA, and C_ibo/C_obo capacitance curves documented across reverse bias voltage and collector current.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum allowable collector-emitter voltage before breakdown; defines rail tolerance in 24 V/48 V industrial control inputs.
I_C (continuous)	500 mA - Sustained output drive capability; supports relay drivers and LED array switches without forced cooling.
h_FE	≥100 at I_C = 10 mA - Ensures reliable base-current-limited switching with margin for temperature drift.
f_T	100 MHz - Enables clean digital edge handling up to ~10–15 MHz square waves in logic-level translation.
V_CE(sat)	≤0.25 V at I_C/I_B = 10 - Minimizes conduction loss in saturated-switch applications like load enable circuits.
R_JA	272°C/W - Requires minimal copper area for thermal management on standard FR-5 PCBs.

Pinout & Package

SC-70 (SOT-323) surface-mount package with 1.3 mm × 2.1 mm footprint, 0.95 mm height, and gull-wing leads. Moisture sensitivity level (MSL) 1 - floor-life unlimited at ≤30°C/60% RH.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires series resistor to limit I_B per h_FE and target I_C.
2	Emitter	Reference terminal for biasing; connected to ground or low-side return path in common-emitter configurations.
3	Collector	Output current sink; interfaces with pull-up resistors, inductive loads, or downstream logic inputs.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress - suitable for under-hood sensor interfaces.
4 kV HBM ESD rating	Withstands electrostatic discharge during manual handling and board assembly without external protection diodes.
Pb-free, RoHS-compliant	Meets global environmental regulations; compatible with lead-free reflow profiles (peak 260°C).
Low V_CE(sat)	Reduces power loss and self-heating in high-duty-cycle switching, extending thermal margin in sealed enclosures.

Applications

Automotive Door Module Driver	Industrial PLC Input Buffer
Use Scenario: Driving window lift motor enable signals and mirror fold/unfold relays in door control units. IC Role / Device Role / Timing Role: NPN switch translating 3.3 V/5 V MCU GPIO to 12 V/24 V load control with galvanic isolation via optocoupler or direct drive. Use Value: 80 V V_CEO accommodates load dump transients; 500 mA I_C supports dual small relays or LED status banks.	Use Scenario: Level-shifting and current amplification for 24 V DC field inputs into 3.3 V microcontroller I/O pins. IC Role / Device Role / Timing Role: Active-low input buffer with hysteresis-capable bias network, converting industrial voltage thresholds to logic-compatible levels. Use Value: 100 MHz f_T ensures fast response to 10 kHz pulse train inputs; MSL 1 simplifies automated assembly logistics.
Consumer Appliance Fan Control	Medical Diagnostic Sensor Interface
Use Scenario: PWM-controlled DC fan driver in smart HVAC and kitchen appliances where size and thermal efficiency are critical. IC Role / Device Role / Timing Role: Low-side switch modulating fan current with <1 µs turn-on/off times measured at 50% duty cycle. Use Value: V_CE(sat) ≤ 0.25 V minimizes heat generation at 300 mA average load; SC-70 footprint saves >40% board area vs. SOT-23.	Use Scenario: Isolating and amplifying low-level analog signals from pressure or temperature sensors before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed-gain biasing, providing noise-immune signal conditioning prior to digitization. Use Value: h_FE ≥ 100 ensures stable gain over −40°C to +85°C; RoHS compliance meets IEC 60601-1 material restrictions.

Automotive Door Module Driver

Industrial PLC Input Buffer

Use Scenario: Driving window lift motor enable signals and mirror fold/unfold relays in door control units.

IC Role / Device Role / Timing Role: NPN switch translating 3.3 V/5 V MCU GPIO to 12 V/24 V load control with galvanic isolation via optocoupler or direct drive.

Use Value: 80 V V_CEO accommodates load dump transients; 500 mA I_C supports dual small relays or LED status banks.

Use Scenario: Level-shifting and current amplification for 24 V DC field inputs into 3.3 V microcontroller I/O pins.

IC Role / Device Role / Timing Role: Active-low input buffer with hysteresis-capable bias network, converting industrial voltage thresholds to logic-compatible levels.

Use Value: 100 MHz f_T ensures fast response to 10 kHz pulse train inputs; MSL 1 simplifies automated assembly logistics.

Consumer Appliance Fan Control

Medical Diagnostic Sensor Interface

Use Scenario: PWM-controlled DC fan driver in smart HVAC and kitchen appliances where size and thermal efficiency are critical.

IC Role / Device Role / Timing Role: Low-side switch modulating fan current with <1 µs turn-on/off times measured at 50% duty cycle.

Use Value: V_CE(sat) ≤ 0.25 V minimizes heat generation at 300 mA average load; SC-70 footprint saves >40% board area vs. SOT-23.

Use Scenario: Isolating and amplifying low-level analog signals from pressure or temperature sensors before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed-gain biasing, providing noise-immune signal conditioning prior to digitization.

Use Value: h_FE ≥ 100 ensures stable gain over −40°C to +85°C; RoHS compliance meets IEC 60601-1 material restrictions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBTA06WT1G	Identical electrical specs and SC-70 package; differs only in tape-and-reel quantity (3,000 pcs vs. 10,000 pcs).	No functional difference; selected when smaller batch procurement or shorter lead time is required.	Preferred for prototyping or low-volume production runs where inventory turnover is rapid.
BC846BW	Same SC-70 package but lower V_CEO = 65 V and h_FE min = 110; f_T = 100 MHz unchanged.	Not recommended for 80 V rail environments; acceptable in 5 V/12 V logic-level systems with tighter gain tolerance needs.	Choose when higher minimum h_FE is prioritized over voltage headroom, and system transients remain below 60 V.

Compared with MMBTA06WT1G, SMMBTA06WT3G offers identical performance with optimized logistics for high-volume manufacturing; versus BC846BW, it trades slightly lower h_FE guarantee for robust 80 V breakdown margin essential in automotive and industrial power domains.

Availability

SMMBTA06WT3G is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for SMMBTA06WT3G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The MMBTA06W/SMMBTA06W family targets cost-sensitive, high-reliability discrete switching in automotive modules and industrial controls, emphasizing AEC-Q101 compliance, thermal robustness, and compact packaging.

FAQ

What is the maximum junction temperature for SMMBTA06WT3G?

The SMMBTA06WT3G has a specified junction and storage temperature range of −55°C to +150°C. This allows operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating of power dissipation must be applied above 25°C ambient per the R_JA = 272°C/W thermal resistance value provided in the datasheet.

Is SMMBTA06WT3G pin-compatible with SOT-23 NPN transistors?

No - SMMBTA06WT3G uses the SC-70 (SOT-323) package with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector. Standard SOT-23 packages have different pinouts (e.g., pin 1 = Emitter) and larger dimensions. Direct replacement requires PCB layout revision; SMMBTA06WT3G is not a drop-in substitute for SOT-23 devices.

Does SMMBTA06WT3G support 24 V DC load switching?

Yes - with V_CEO = 80 V and I_C = 500 mA, the SMMBTA06WT3G safely switches 24 V DC loads such as solenoids, small relays, and indicator LEDs. Its 0.25 V V_CE(sat) at I_C/I_B = 10 ensures low conduction loss, and the SOA curve confirms stability under repetitive 24 V inductive switching with appropriate snubbing.

What is the ESD rating of SMMBTA06WT3G and how is it tested?

The SMMBTA06WT3G is rated for 4 kV per Human Body Model (HBM) and 400 V per Machine Model (MM), per JEDEC JS-001 and JESD22-A115 standards. These values are verified during qualification testing and reflect robustness during PCB assembly and handling - no external ESD protection is required for typical SMT lines.

Can SMMBTA06WT3G be used in linear amplifier configurations?

While primarily designed for switching, the SMMBTA06WT3G can operate in linear mode within its SOA limits - e.g., at I_C ≤ 100 mA and V_CE ≤ 5 V. However, its h_FE variation across current and temperature (per Figure 6) and lack of guaranteed linearity parameters make it less optimal than purpose-built RF or audio transistors for precision analog gain stages.

SMMBTA06WT3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 150 mW

Frequency - Transition:: 100MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-3 (SOT323)

SMMBTA06WT3G FAQ

1.How can I place an order for SMMBTA06WT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for SMMBTA06WT3G 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 SMMBTA06WT3G reliable?

The price and inventory of SMMBTA06WT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMMBTA06WT3G is usually 5 days.

3.What payment methods are accepted for SMMBTA06WT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMMBTA06WT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMMBTA06WT3G?

SMMBTA06WT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMMBTA06WT3G 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 SMMBTA06WT3G?

For technical support, including SMMBTA06WT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMMBTA06WT3G requirements.

6.How does Aetrix verify that SMMBTA06WT3G is sourced from the original manufacturer or authorized distributors?

All SMMBTA06WT3G 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 SMMBTA06WT3G meets industry standards.

7.What is the process for return or replacement of SMMBTA06WT3G?

All SMMBTA06WT3G units undergo pre-shipment inspection (PSI). If there is an issue with SMMBTA06WT3G, 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 SMMBTA06WT3G part is unused and in its original packaging.

Return procedure for SMMBTA06WT3G:

1.Submit a request within 90 days.

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

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