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onsemi SBCW33LT1G
- Part No.:
- SBCW33LT1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SBCW33LT1G.pdf
- Description:
- TRANS NPN 32V 0.1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SBCW33LT1G from onsemi is an automotive-grade NPN general-purpose silicon transistor in SOT-23 package, rated for VCEO = 32 V, IC = 100 mA, and hFE = 420–800 at IC = 2 mA, used in low-power switching and amplification circuits within automotive body control modules and sensor interface stages.
For engineers reviewing the SBCW33LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include AEC-Q101 qualification, Pb-free/RoHS compliance, thermal resistance (RJA = 556 °C/W on FR-5), noise figure ≤10 dB at 1 kHz, and SOT-23 pin-compatible replacement options for legacy BCW33 designs.
Technical Context
This device operates as a discrete NPN bipolar junction transistor with base-emitter turn-on voltage of 0.55–0.70 V at IC = 2 mA and VCE = 5 V, and exhibits VCE(sat) ≤ 0.25 V at IC = 10 mA / IB = 0.5 mA - enabling efficient low-voltage switching in 3.3 V and 5 V logic-driven loads.
Its small-signal performance includes fT up to 300 MHz at IC = 10 mA, Cobo ≤ 4.0 pF at VCB = 10 V, and noise figure ≤10 dB under 1 kHz/200 Hz bandwidth conditions - supporting audio preamplifier and low-noise signal conditioning roles where gain stability and minimal added noise are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 32 V - Maximum collector-emitter voltage before breakdown; supports 24 V automotive supply rail margin with safety headroom. |
| IC (continuous) | 100 mA - Continuous collector current rating; suitable for driving LEDs, relays, and small solenoids without external heat sinking. |
| hFE | 420–800 - DC current gain range at IC = 2 mA/VCE = 5 V; enables high-current gain in low-base-drive applications like microcontroller GPIO interfacing. |
| VCE(sat) | ≤0.25 V - Saturation voltage at IC/IB = 20; ensures <1 mW power loss during switch-on state in battery-powered systems. |
| RJA (FR-5) | 556 °C/W - Junction-to-ambient thermal resistance on standard PCB; defines maximum allowable power dissipation (225 mW at 25 °C). |
| Package | SOT-23 (TO-236) - 3-pin surface-mount package with 2.90 × 1.30 × 1.00 mm footprint; compatible with automated pick-and-place and reflow assembly. |
| AEC-Q101 | Qualified - Meets automotive reliability stress test requirements for temperature cycling, HTRB, and ESD; approved for PPAP submission. |
Pinout & Package
SOT-23 (TO-236) package per Case 318-08, Style 6: 2.90 mm × 1.30 mm × 1.00 mm body with 1.90 mm lead pitch; marked "BCW33LT1G" on top surface; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased injection; requires ≥0.55 V to initiate conduction; base resistor sizing must limit IB to avoid exceeding IC/hFE(min). |
| 2 | Emiter | Current return path; connected to ground or low-side reference; common node for emitter-follower or common-emitter configurations. |
| 3 | Collector | Output current terminal; handles switched load current up to 100 mA; routed to VCC or active load in saturated switch mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications including BCM, lighting control, and sensor signal conditioning. |
| Low VCE(sat) | ≤0.25 V at IC = 10 mA/IB = 0.5 mA - reduces conduction losses and self-heating in always-on or duty-cycled switches. |
| High hFE range | 420–800 - allows use with weak drive sources (e.g., 3.3 V MCU GPIO) while maintaining saturation across process and temperature variation. |
| Low noise figure | ≤10 dB at 1 kHz - enables use in microphone preamps and analog sensor front-ends where signal integrity is critical. |
| Pb-free & RoHS | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements; no lead or brominated flame retardants. |
Applications
| Automotive Body Control Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Switching 12 V LED indicators and small relays in door module PCBs. IC Role / Device Role / Timing Role: Discrete NPN switch controlled by 3.3 V microcontroller GPIO. Use Value: Low VCE(sat) minimizes power loss and thermal rise in space-constrained modules; AEC-Q101 ensures long-term reliability under vibration and thermal cycling. |
Use Scenario: Amplifying low-level output from thermistor or potentiometer-based position sensors. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias network. Use Value: High hFE enables stable gain with minimal base current draw; low noise figure preserves SNR in analog signal chains. |
| Consumer Audio Preamp | IoT Edge Node Signal Conditioning |
Use Scenario: First-stage amplification of electret microphone signals in portable speakers. IC Role / Device Role / Timing Role: Low-noise common-emitter amplifier biased at IC = 0.2 mA. Use Value: NF ≤10 dB at 1 kHz ensures clean audio capture; compact SOT-23 footprint saves board area in battery-powered devices. |
Use Scenario: Level-shifting and buffering analog sensor outputs before ADC sampling in smart sensor nodes. IC Role / Device Role / Timing Role: Emitter-follower buffer isolating high-impedance sensor from ADC input. Use Value: High hFE maintains unity gain accuracy; low Cobo (≤4 pF) prevents signal distortion at 100 kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BCW33LT1G | No "S" prefix; commercial grade (non-AEC-Q101); identical electrical specs and SOT-23 pinout. | Not qualified for automotive production; acceptable for industrial or consumer prototypes. | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs. |
| MMBT3904LT1G | Lower hFE (100–300), higher VCE(sat) (≤0.3 V), same VCEO = 40 V and IC = 200 mA rating. | Better suited for higher-current digital switching; less ideal for low-noise analog gain. | Choose for robust digital logic interfacing where gain linearity and noise are secondary to current handling. |
Compared with BCW33LT1G and MMBT3904LT1G, the SBCW33LT1G uniquely combines AEC-Q101 qualification, high hFE, and low-noise operation - making it the preferred choice for automotive and precision analog applications where reliability and signal fidelity are jointly critical.
Availability
SBCW33LT1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, consumer audio preamplifiers, and IoT edge node signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for SBCW33LT1G 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 SBCW33LT1G belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for reliable, low-cost switching and amplification in automotive and industrial environments where AEC-Q101 compliance and thermal robustness are essential.
FAQ
What is the maximum operating temperature range for the SBCW33LT1G?
The SBCW33LT1G has a specified junction and storage temperature range of −55 °C to +150 °C. This wide range supports deployment in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating of power dissipation begins above 25 °C per the thermal characteristics table in the official datasheet, and the device remains functional across its full rated TJ range when operated within VCEO, IC, and PD limits.
Is the SBCW33LT1G pin-compatible with the BCW33LT1G?
Yes, the SBCW33LT1G is pin-compatible with the BCW33LT1G - both use the SOT-23 (TO-236) package with identical Style 6 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector). The only functional difference is the "S" prefix denoting AEC-Q101 qualification and PPAP capability for the SBCW33LT1G, while all electrical and thermal specifications remain identical per the shared datasheet.
Does the SBCW33LT1G support low-noise analog amplification?
Yes, the SBCW33LT1G supports low-noise analog amplification with a noise figure ≤10 dB at VCE = 5.0 V, IC = 0.2 mA, RS = 2.0 kΩ, f = 1.0 kHz, and BW = 200 Hz. Its low Cobo (≤4.0 pF) and high hFE also contribute to stable gain and minimal signal degradation in microphone preamps and sensor front-ends - confirmed by typical noise voltage and current plots in the datasheet.
What is the thermal resistance of the SBCW33LT1G on a standard FR-5 PCB?
The SBCW33LT1G has a thermal resistance RJA of 556 °C/W when mounted on an FR-5 board (1.0 × 0.75 × 0.062 in.), with a total device dissipation rating of 225 mW at TA = 25 °C. This value decreases linearly by 1.8 mW/°C above 25 °C ambient, meaning usable power drops to ~135 mW at 75 °C ambient - a key constraint for sustained operation in enclosed or high-temperature environments.
How does the SBCW33LT1G differ from the MMBT3904LT1G in practical design use?
The SBCW33LT1G differs from the MMBT3904LT1G in three key ways: (1) it offers higher hFE (420–800 vs. 100–300), enabling lower base drive requirements; (2) it features lower VCE(sat) (≤0.25 V vs. ≤0.3 V), reducing conduction loss; and (3) it carries AEC-Q101 qualification, whereas the MMBT3904LT1G is commercial-grade. These differences make the SBCW33LT1G preferable for automotive and precision analog roles, while the MMBT3904LT1G suits higher-current digital switching.
SBCW33LT1G 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
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 32 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 500µA, 10mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 300 mW
- Frequency - Transition:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SBCW33LT1G FAQ
1.How can I place an order for SBCW33LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SBCW33LT1G 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 SBCW33LT1G reliable?
The price and inventory of SBCW33LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBCW33LT1G is usually 5 days.
3.What payment methods are accepted for SBCW33LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBCW33LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBCW33LT1G?
SBCW33LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBCW33LT1G 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 SBCW33LT1G?
For technical support, including SBCW33LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBCW33LT1G requirements.
6.How does Aetrix verify that SBCW33LT1G is sourced from the original manufacturer or authorized distributors?
All SBCW33LT1G 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 SBCW33LT1G meets industry standards.
7.What is the process for return or replacement of SBCW33LT1G?
All SBCW33LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SBCW33LT1G, 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 SBCW33LT1G part is unused and in its original packaging.
Return procedure for SBCW33LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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