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onsemi SMMBTA14LT1G
- Part No.:
- SMMBTA14LT1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SMMBTA14LT1G.pdf
- Description:
- TRANS NPN DARL 30V 0.3A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,881
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Product details
Overview
SMMBTA14LT1G from onsemi is an NPN silicon Darlington transistor in SOT-23 package, rated for 30 VCE, 300 mA continuous collector current, and DC current gain up to 20,000 at 100 mA - used in low-power switching and linear amplification stages of sensor interface and power management circuits.
For engineers reviewing the SMMBTA14LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed high hFE at 100 mA, low VCE(sat) ≤1.5 V, AEC-Q101 qualification, Pb-free RoHS compliance, and thermal performance on FR-5 and alumina substrates.
Technical Context
This device implements a monolithic two-stage NPN Darlington configuration with integrated base-emitter resistor network absent - requiring external base drive control. It operates with VEB ≤10 V and supports safe operation from −55 °C to +150 °C junction temperature.
Its small-signal fT is 125 MHz at IC = 10 mA, VCE = 5 V, enabling use in medium-frequency amplification. Noise characteristics are specified across 10 Hz–15.7 kHz bandwidth, with wideband noise voltage <8 nV/√Hz at IC = 1 mA and RS = 1 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCE max | 30 V - supports rail voltages up to 24 V systems with margin for transients |
| IC continuous | 300 mA - suitable for driving relays, LEDs, or small solenoids directly |
| hFE min | 10,000 at IC = 100 mA - enables ultra-low base drive current (≤10 μA) for efficient control |
| VCE(sat) max | 1.5 V at IC/IB = 1000 - minimizes conduction loss in saturated switch applications |
| fT | 125 MHz - supports amplification up to mid-VHF range with usable gain |
| RJA (FR-5) | 556 °C/W - defines thermal derating slope of 1.8 mW/°C above 25 °C ambient |
| Junction temp | −55 to +150 °C - qualified for under-hood automotive and industrial environments |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, 3-pin, Pb-free, RoHS compliant. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector (Style 6 per onsemi mechanical drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input node; requires current-limited drive to achieve target IC due to Darlington β multiplication |
| 2 | Emitter | Common reference terminal; connects to ground or low-side return path in switch configurations |
| 3 | Collector | Output node; handles switched load current up to 300 mA with VCE ≤1.5 V saturation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including body control modules and sensor signal conditioning |
| High DC current gain | Min 10,000 at 100 mA ensures microampere-level base drive suffices for full-load switching |
| Low saturation voltage | VCE(sat) ≤1.5 V reduces power dissipation in high-duty-cycle on-state operation |
| Wide operating temperature | −55 °C to +150 °C junction range supports deployment in engine compartments and industrial enclosures |
| Pb-free / RoHS | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements |
Applications
| Automotive Door Lock Actuator Control | Industrial Temperature Sensor Signal Amplifier |
|---|---|
Use Scenario: Driving 24 V DC solenoid locks in vehicle door modules with PWM-controlled dwell time. IC Role / Device Role / Timing Role: High-gain Darlington switch providing low-base-current on/off control of inductive load. Use Value: Enables direct MCU GPIO drive without external driver stage, reducing BOM count and PCB area. | Use Scenario: Amplifying low-level thermistor voltage outputs (mV range) before ADC sampling in PLC analog input modules. IC Role / Device Role / Timing Role: Linear-mode NPN Darlington configured as emitter-follower buffer with high input impedance. Use Value: Delivers stable gain >10,000 with minimal self-heating error over −40 °C to +85 °C ambient. |
| Smart Home Smoke Detector Audio Driver | Medical Infusion Pump Motor Enable Stage |
Use Scenario: Driving piezoelectric buzzer elements during alarm activation in battery-powered smoke detectors. IC Role / Device Role / Timing Role: Switching element delivering pulsed 300 mA peak current to buzzer coil. Use Value: Low VCE(sat) extends battery life by minimizing resistive losses during audible alerts. | Use Scenario: Enabling 12 V stepper motor phases in portable infusion pumps where EMI and reliability are critical. IC Role / Device Role / Timing Role: Final-stage power switch activated by microcontroller logic with fast turn-on/turn-off. Use Value: AEC-Q101 qualification and 150 °C TJ(max) ensure robustness against thermal stress during extended duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBTA14LT1G | No "S" prefix; not AEC-Q101 qualified; identical electrical specs and SOT-23 package | Restricted to commercial/industrial use; unsuitable for automotive production | Select when AEC-Q101 compliance is not required and cost optimization is prioritized |
| ZTX1048A | TO-92 package; higher VCEO = 45 V; hFE min = 1000 at 100 mA - lower gain than SMMBTA14LT1G | Requires through-hole assembly; suited for prototyping or legacy board designs | Choose only if SOT-23 footprint is unavailable and lower gain is acceptable |
Compared with MMBTA14LT1G and ZTX1048A, the SMMBTA14LT1G uniquely combines AEC-Q101 qualification, SOT-23 surface-mount compatibility, and minimum hFE of 10,000 - making it the sole option for space-constrained automotive Darlington switching where high gain and reliability are jointly required.
Availability
SMMBTA14LT1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, smart home alarm systems, and medical device enable circuits requiring stable component supply across long production lifecycles.
Supply support for SMMBTA14LT1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMMBTA14LT1G belongs to onsemi's discrete bipolar transistor product line, engineered for high-reliability linear amplification and low-power switching in harsh-environment applications demanding AEC-Q101 validation.
FAQ
What is the maximum collector-emitter voltage rating for the SMMBTA14LT1G?
The SMMBTA14LT1G has a maximum collector-emitter voltage (VCE) rating of 30 Vdc, verified per onsemi's official datasheet revision 9. This rating applies under continuous DC conditions with proper thermal management and defines the upper limit for safe operation in switching or amplification circuits. Exceeding this voltage risks irreversible breakdown and device failure.
Is the SMMBTA14LT1G AEC-Q101 qualified?
Yes, the SMMBTA14LT1G is explicitly AEC-Q101 qualified and PPAP capable, as confirmed in the "Features" section of the official onsemi datasheet. The "S" prefix denotes automotive-grade screening and unique site/control change requirements. This qualification validates its suitability for automotive applications such as door modules, lighting controls, and sensor interfaces where reliability under thermal and vibration stress is mandatory.
What is the DC current gain (hFE) specification for the SMMBTA14LT1G at 100 mA collector current?
The SMMBTA14LT1G guarantees a minimum DC current gain (hFE) of 10,000 at IC = 100 mAdc and VCE = 5.0 Vdc, per the Electrical Characteristics table in the onsemi datasheet. This high gain enables ultra-low base drive current - typically ≤10 μA - making the SMMBTA14LT1G ideal for microcontroller GPIO-driven switching without additional driver stages.
What package type does the SMMBTA14LT1G use, and what are its dimensions?
The SMMBTA14LT1G uses the SOT-23 (TO-236) package, with mechanical dimensions of 2.90 mm × 1.30 mm × 1.00 mm and 1.90 mm lead pitch. This is confirmed in the "Mechanical Case Outline" section of the onsemi datasheet (Case 318, Style 6). The package is Pb-free and RoHS compliant, supporting standard reflow soldering profiles for high-volume SMT assembly.
Does the SMMBTA14LT1G have a built-in base-emitter resistor?
No, the SMMBTA14LT1G does not include internal base-emitter resistors. It is a standard two-terminal Darlington pair (base, emitter, collector) without integrated biasing networks. External base current limiting must be provided by the circuit design - for example, via a series resistor between MCU output and pin 1 (base) - to ensure proper saturation and avoid excessive base current damage.
SMMBTA14LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 300 mA
- 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:
- 20000 @ 100mA, 5V
- Power - Max:
- 225 mW
- Frequency - Transition:
- 125MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SMMBTA14LT1G FAQ
1.How can I place an order for SMMBTA14LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMMBTA14LT1G 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 SMMBTA14LT1G reliable?
The price and inventory of SMMBTA14LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMMBTA14LT1G is usually 5 days.
3.What payment methods are accepted for SMMBTA14LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMMBTA14LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMMBTA14LT1G?
SMMBTA14LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMMBTA14LT1G 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 SMMBTA14LT1G?
For technical support, including SMMBTA14LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMMBTA14LT1G requirements.
6.How does Aetrix verify that SMMBTA14LT1G is sourced from the original manufacturer or authorized distributors?
All SMMBTA14LT1G 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 SMMBTA14LT1G meets industry standards.
7.What is the process for return or replacement of SMMBTA14LT1G?
All SMMBTA14LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMMBTA14LT1G, 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 SMMBTA14LT1G part is unused and in its original packaging.
Return procedure for SMMBTA14LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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