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onsemi MMBT6427LT1
- Part No.:
- MMBT6427LT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
MMBT6427LT1.pdf
- Description:
- TRANS SS DARL NPN 40V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,231
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Product details
Overview
MMBT6427LT1 from onsemi is an NPN silicon Darlington transistor in SOT-23 package, rated for 40 VCEO, 500 mA continuous collector current, and 225 mW dissipation on FR-5 board. It delivers high DC current gain (hFE = 10,000–200,000), low VCE(sat) (1.2–1.5 V), and is AEC-Q101 qualified for automotive signal amplification and load switching.
For engineers reviewing the MMBT6427LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include verified Darlington configuration, SOT-23 pin mapping (Base–Emitter–Collector), thermal derating behavior, and noise performance at 1 kHz (NF ≤ 10 dB) in low-current sensing circuits.
Technical Context
This device implements a monolithic NPN Darlington pair with integrated base-emitter resistor network, enabling high current gain without external bias components. Its dual-transistor topology provides current amplification >104 at IC = 10 mA while maintaining VBE(sat) ≤ 2.0 V and VCE(sat) ≤ 1.5 V under defined drive conditions.
Thermal design is constrained by RJA = 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, with junction temperature range −55°C to +150°C. Electrical characteristics are specified at TA = 25°C, with derating applied above that ambient per 1.8 mW/°C (FR-5) or 2.4 mW/°C (alumina).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in switching applications. |
| IC (continuous) | 500 mA - Continuous collector current rating; sets maximum load drive capability without forced cooling. |
| hFE | 10,000–200,000 - DC current gain range across 10–500 mA; enables microampere-level base drive for milliampere loads. |
| VCE(sat) | 1.2–1.5 V - Saturation voltage at IC/IB = 1000; determines conduction loss and heat generation in ON-state. |
| NF | ≤10 dB - Noise figure at IC = 1.0 mA, f = 1 kHz, RS = 100 kΩ; critical for low-level analog signal amplification stages. |
| TJ range | −55°C to +150°C - Operating junction temperature window; supports 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. Marking: "1V" (device code), date code, and "G" suffix indicating Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Input control terminal; accepts low-current drive to enable high-gain switching or amplification. |
| 2 | Emitter | Common emitter node; referenced to ground or low-side return path in common-emitter configurations. |
| 3 | Collector | Output current terminal; connects to load or higher-voltage rail; carries amplified output current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Darlington architecture | Monolithic two-stage NPN structure delivering >104 current gain without external bias resistors. |
| Low saturation voltage | VCE(sat) ≤ 1.5 V at IC = 500 mA ensures <750 mW conduction loss and reduced thermal burden. |
| Pb-free / RoHS compliant | Meets EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements for green manufacturing. |
Applications
| Automotive Door Module Control | Industrial Sensor Signal Amplification |
|---|---|
|
Use Scenario: Driving small solenoids and LED indicators in door lock/unlock modules where space and power efficiency are constrained. IC Role / Device Role / Timing Role: High-gain Darlington switch providing 500 mA load current from <500 µA MCU GPIO output. Use Value: Eliminates need for discrete base-bias resistors and secondary driver stage, reducing BOM count and PCB area. |
Use Scenario: Amplifying weak mV-level signals from thermistors or bridge sensors in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Low-noise, high-input-impedance amplifier stage with NF ≤ 10 dB at 1 kHz and hFE ≥ 10,000. Use Value: Enables direct interface between passive sensors and 12-bit ADCs without op-amp buffering, lowering system cost. |
| Consumer Appliance Motor Driver | Medical Infusion Pump Actuator |
|
Use Scenario: Controlling small DC brush motors in smart home appliances such as HVAC dampers or coffee grinders. IC Role / Device Role / Timing Role: Low-VCE(sat) Darlington switch handling intermittent 300–500 mA motor stall currents. Use Value: Limits self-heating to <1.5 W at full load, allowing operation within SOT-23 thermal limits without heatsinking. |
Use Scenario: Precision current regulation for stepper motor microstepping in portable infusion pumps requiring fail-safe operation. IC Role / Device Role / Timing Role: Current-amplifying interface between microcontroller PWM output and motor phase winding. Use Value: Junction temperature remains below 125°C during 500 mA pulses, supporting continuous duty cycle compliance per IEC 60601-1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT6428LT1G | Same SOT-23 package and Darlington topology but PNP polarity; VCEO = −40 V, IC = −500 mA. | Used in high-side switching or complementary output stages where sourcing current is required. | Select when circuit requires PNP complement to MMBT6427LT1 in push-pull or level-shifting designs. |
| ZTX1051A | TO-92 package, higher VCEO = 60 V, hFE = 10,000–50,000, RJA = 200 °C/W - significantly lower thermal resistance but larger footprint. | Suitable for higher-power or through-hole prototyping where thermal margin exceeds SOT-23 limits. | Choose only if board layout allows TO-92 placement and thermal design requires >300 mW dissipation capability. |
Compared with MMBT6427LT1, MMBT6428LT1G offers polarity inversion for complementary use, while ZTX1051A trades miniaturization for higher voltage rating and better thermal performance - neither is pin-compatible, and both require layout revision.
Availability
MMBT6427LT1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer appliance motor control requiring stable component supply and AEC-Q101 compliance.
Supply support for MMBT6427LT1 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
The MMBT6427LT1 belongs to onsemi's precision bipolar transistor family designed specifically for high-gain, low-noise, and AEC-Q101-qualified signal switching in space-constrained automotive and industrial systems.
FAQ
What is the exact pin configuration of the MMBT6427LT1?
The MMBT6427LT1 uses Style 6 pinout in the SOT-23 package: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This configuration is confirmed in the official onsemi mechanical drawing (CASE 318, STYLE 6) and matches the marking diagram showing "BASE", "EMITTER 2", and "COLLECTOR 3".
Is the MMBT6427LT1 suitable for automotive applications?
Yes, the MMBT6427LT1 is AEC-Q101 qualified and PPAP capable, with explicit qualification for automotive use in the datasheet. Its −55°C to +150°C junction temperature range, Pb-free construction, and stress-tested reliability make it appropriate for under-hood and cabin control modules where MMBT6427LT1 operates as a Darlington switch or amplifier.
What is the maximum power dissipation of the MMBT6427LT1 on a standard PCB?
The MMBT6427LT1 dissipates up to 225 mW on FR-5 board at TA = 25°C, with linear derating of 1.8 mW/°C above that ambient. This value is measured using a 1.0 × 0.75 × 0.062 inch FR-5 test board per Note 1 in the Thermal Characteristics table of the MMBT6427LT1 datasheet.
Does the MMBT6427LT1 have integrated base-emitter resistors?
No, the MMBT6427LT1 is a bare Darlington transistor without internal base-emitter resistors. It requires external base biasing - either via current-limiting resistor from MCU GPIO or active driver - to establish proper operating point, as confirmed by its electrical test conditions specifying IB = 0.5 mA for VCE(sat) measurement.
How does the noise performance of the MMBT6427LT1 compare to standard NPN transistors?
The MMBT6427LT1 achieves NF ≤ 10 dB at IC = 1.0 mA, f = 1 kHz, and RS = 100 kΩ - competitive with low-noise discrete NPNs due to optimized Darlington geometry and process control. This makes MMBT6427LT1 viable for front-end amplification where signal integrity matters, unlike general-purpose switches.
MMBT6427LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBT6427LT1 FAQ
1.How can I place an order for MMBT6427LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT6427LT1 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 MMBT6427LT1 reliable?
The price and inventory of MMBT6427LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT6427LT1 is usually 5 days.
3.What payment methods are accepted for MMBT6427LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT6427LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT6427LT1?
MMBT6427LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT6427LT1 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 MMBT6427LT1?
For technical support, including MMBT6427LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT6427LT1 requirements.
6.How does Aetrix verify that MMBT6427LT1 is sourced from the original manufacturer or authorized distributors?
All MMBT6427LT1 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 MMBT6427LT1 meets industry standards.
7.What is the process for return or replacement of MMBT6427LT1?
All MMBT6427LT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT6427LT1, 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 MMBT6427LT1 part is unused and in its original packaging.
Return procedure for MMBT6427LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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