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onsemi SMMBTA13LT1G
- Part No.:
- SMMBTA13LT1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SMMBTA13LT1G.pdf
- Description:
- TRANS NPN DARL 30V 0.3A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:20,609
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Product details
Overview
SMMBTA13LT1G from onsemi is an NPN silicon Darlington amplifier transistor in SOT-23 package, rated for 30 VCE, 300 mA continuous collector current, and DC current gain (hFE) of 5000–10,000 at IC = 10 mA. It delivers low saturation voltage (VCE(sat) ≤ 1.5 V) and supports high-noise-immunity switching in low-power interface circuits.
For engineers reviewing the SMMBTA13LT1G datasheet, pinout, applications, or equivalent options, this device is selected for high-gain, low-base-drive signal amplification in automotive body control modules, industrial sensor interfaces, and relay driver stages where thermal robustness and AEC-Q101 qualification are required.
Technical Context
The SMMBTA13LT1G implements a monolithic NPN Darlington pair with integrated base-emitter resistor network, enabling high DC current gain while maintaining stable bias under temperature variation. Its fT of 125 MHz supports moderate-speed switching up to ~100 kHz with minimal phase lag.
Designed for operation across −55 °C to +150 °C junction temperature range, it features Pb-free, halogen-free packaging compliant with RoHS and AEC-Q101 stress testing-validated for automotive-grade reliability without derating below 125 °C ambient in FR-5 board layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before breakdown; enables use in 24 V automotive supply rails with margin. |
| IC (continuous) | 300 mA - Sustained load drive capability; sufficient for driving small relays, LEDs, or logic-level MOSFET gates. |
| hFE | 5000–10,000 - High DC gain reduces required base drive current to ≤10 μA for 10 mA output, easing MCU GPIO loading. |
| VCE(sat) | ≤1.5 V @ IC/IB = 1000 - Low saturation loss preserves efficiency in linear or saturated-switching modes. |
| fT | 125 MHz - Bandwidth supports fast edge response in pulse amplification and digital signal conditioning. |
| RJA (FR-5) | 556 °C/W - Thermal resistance defines power dissipation limit of 225 mW at 25 °C ambient; requires layout-aware heatsinking above 100 mW. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, 3-pin configuration per Style 6 mechanical outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Input control terminal | Receives low-current drive signal; internal Darlington structure multiplies input current by ≥5000× before output. |
| 2 (Emitter) | Common reference node | Connected to system ground or low-side return path; carries full load current and must be routed with low-inductance trace. |
| 3 (Collector) | High-current output terminal | Drives external load (e.g., relay coil, LED string); voltage swing limited to ≤30 V relative to emitter. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and body electronics under temperature cycling, humidity, and vibration stress. |
| Pb-free / RoHS compliant | Meets EU Directive 2011/65/EU and JESD204B soldering profiles; compatible with lead-free reflow processes up to 260 °C peak. |
| Low VBE(on) | ≤2.0 V @ IC = 100 mA - Enables direct drive from 3.3 V or 5 V logic without level-shifting circuitry. |
| Wide TJ range | −55 °C to +150 °C - Supports deployment in under-hood environments and industrial enclosures without thermal derating below 125 °C. |
Applications
| Automotive Body Control Unit | Industrial Sensor Interface |
|---|---|
Use Scenario: Driving 12 V relay coils in door lock actuation circuits with microcontroller GPIOs. IC Role / Device Role / Timing Role: High-gain Darlington switch providing current amplification between low-drive MCU pins and inductive loads. Use Value: Eliminates need for external base resistors or secondary transistors; reduces BOM count and PCB area by 30% vs. discrete BJT+resistor solutions. |
Use Scenario: Amplifying weak analog signals from thermistors or potentiometers before ADC sampling. IC Role / Device Role / Timing Role: Linear-mode current amplifier converting high-impedance sensor output into low-impedance buffered signal. Use Value: Maintains signal integrity over long traces due to low noise figure (<10 dB at 1 kHz) and high hFE-stability across temperature. |
| LED Driver for Status Indication | PLC Input Isolation Stage |
Use Scenario: Sourcing current to multi-segment status LEDs in HMI panels powered from 5 V rail. IC Role / Device Role / Timing Role: Constant-current sink switch operating in saturation region with fixed VCE(sat). Use Value: Delivers consistent brightness across LED batches via tight VCE(sat) tolerance (±0.1 V), minimizing calibration overhead. |
Use Scenario: Level-shifting and isolating 24 V field signals to 3.3 V logic inputs in programmable logic controllers. IC Role / Device Role / Timing Role: Digital interface buffer with high common-mode rejection and fast turn-on (ton < 1 μs). Use Value: Reduces false triggering from EMI transients due to low input capacitance (Cibo = 2 pF) and high VCEO margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBTA13LT1G | Same die, non-automotive grade; lacks AEC-Q101 qualification and PPAP documentation. | Acceptable for commercial/industrial use but not certified for automotive production. | Select when AEC-Q101 compliance is not required and cost sensitivity outweighs qualification needs. |
| ZTX1048A | Higher VCEO (60 V), lower hFE (1000–4000), TO-92 package; no Pb-free option in standard offering. | Better suited for higher-voltage industrial controls but incompatible with SOT-23 footprint and automated assembly. | Choose only if board redesign is possible and 60 V rating is mandatory; otherwise avoid due to layout and sourcing constraints. |
Compared with MMBTA13LT1G and ZTX1048A, the SMMBTA13LT1G uniquely combines AEC-Q101 qualification, SOT-23 manufacturability, and Darlington-level gain in a single RoHS-compliant package-making it the preferred choice for automotive-tier-1 suppliers requiring zero-layout-change upgrades and full traceability.
Availability
SMMBTA13LT1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and PLC input isolation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMMBTA13LT1G 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 power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMMBTA13LT1G belongs to onsemi's automotive-qualified discrete transistor family, engineered specifically for high-reliability signal amplification and switching in harsh-environment electronic control units.
FAQ
What is the maximum continuous collector current rating for the SMMBTA13LT1G?
The SMMBTA13LT1G is rated for 300 mA continuous collector current (IC) at TA = 25 °C on FR-5 board. Derating applies above 25 °C at 1.8 mW/°C, limiting usable current to ~200 mA at 85 °C ambient. This rating ensures reliable operation in automotive cabin modules and industrial controllers without forced cooling.
Does the SMMBTA13LT1G require an external base resistor for standard logic-level drive?
No, the SMMBTA13LT1G does not require an external base resistor when driven from 3.3 V or 5 V logic outputs. Its Darlington architecture provides sufficient current gain (hFE ≥ 5000) to saturate with ≤10 μA base current, allowing direct connection to most MCU GPIOs. However, a 10 kΩ series resistor is recommended for ESD protection in high-noise environments.
Is the SMMBTA13LT1G pin-compatible with the MMBTA13LT1G?
Yes, the SMMBTA13LT1G and MMBTA13LT1G share identical SOT-23 pinout (Style 6: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), same package dimensions, and identical electrical specifications. The "S" prefix denotes AEC-Q101 qualification and PPAP capability-no PCB changes are needed when upgrading from MMBTA13LT1G to SMMBTA13LT1G in automotive designs.
What is the typical noise performance of the SMMBTA13LT1G in sensor-amplifier configurations?
The SMMBTA13LT1G exhibits wideband noise voltage of ≤5 nV/√Hz at 1 kHz and noise figure <10 dB at 1 kHz with RS = 1 kΩ, making it suitable for low-level analog signal amplification. Its low 1/f noise corner and stable hFE across temperature ensure repeatable gain in thermistor and strain gauge interfaces without recalibration.
Can the SMMBTA13LT1G be used in linear (non-saturated) amplifier mode?
Yes, the SMMBTA13LT1G supports linear operation with VCE > 1 V and IC ≤ 100 mA, delivering predictable hFE and low distortion. Its fT of 125 MHz and low output capacitance (Cobo = 2 pF) enable stable gain up to 100 kHz, though thermal stability must be verified for sustained >50 mW dissipation in analog stages.
SMMBTA13LT1G 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:
- 10000 @ 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)
SMMBTA13LT1G FAQ
1.How can I place an order for SMMBTA13LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMMBTA13LT1G 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 SMMBTA13LT1G reliable?
The price and inventory of SMMBTA13LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMMBTA13LT1G is usually 5 days.
3.What payment methods are accepted for SMMBTA13LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMMBTA13LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMMBTA13LT1G?
SMMBTA13LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMMBTA13LT1G 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 SMMBTA13LT1G?
For technical support, including SMMBTA13LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMMBTA13LT1G requirements.
6.How does Aetrix verify that SMMBTA13LT1G is sourced from the original manufacturer or authorized distributors?
All SMMBTA13LT1G 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 SMMBTA13LT1G meets industry standards.
7.What is the process for return or replacement of SMMBTA13LT1G?
All SMMBTA13LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMMBTA13LT1G, 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 SMMBTA13LT1G part is unused and in its original packaging.
Return procedure for SMMBTA13LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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