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onsemi BC81740MTF
- Part No.:
- BC81740MTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC81740MTF.pdf
- Description:
- TRANS NPN 45V 0.8A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,896
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Product details
Overview
BC81740MTF from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor in SOT-23 package, rated for 45 V VCEO, 800 mA IC, and hFE of 250–630 at IC = 100 mA, used in low-power switching and amplifier stages such as AF drivers and signal buffering.
For engineers reviewing the BC81740MTF datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, hFE classification, SOT-23 terminal mapping, and direct alternatives for discrete BJT selection in cost-sensitive consumer and industrial designs.
Technical Context
The BC81740MTF operates as a medium-current, medium-voltage NPN bipolar junction transistor optimized for linear amplification and saturated switching. Its hFE classification "40" confirms DC current gain range of 250–630 at VCE = 1 V and IC = 100 mA, with guaranteed minimum hFE of 170 at IC = 300 mA.
Thermal performance is defined by RθJA = 403 °C/W on standard FR-4 PCB (76 mm × 114 mm), enabling 310 mW power dissipation at 25 °C ambient, derating linearly at 2.48 mW/°C above that temperature. Device supports VBE(on) ≤ 1.2 V and VCE(sat) ≤ 0.7 V under IC = 500 mA / IB = 50 mA conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; defines safe operating voltage headroom in low-voltage switching rails. |
| IC (DC) | 800 mA - Continuous collector current rating; supports load switching up to ~700 mA with adequate heatsinking. |
| hFE Range | 250–630 @ IC = 100 mA - High-gain classification enables low-base-drive designs in amplifier and driver stages. |
| PD | 310 mW @ TA = 25 °C - Power handling capability on standard PCB; requires thermal derating above ambient. |
| fT | 100 MHz - Transition frequency confirms usable bandwidth for audio-frequency amplification and fast digital switching. |
| VCE(sat) | ≤ 0.7 V @ IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in switching applications. |
Pinout & Package
SOT-23 (JEDEC TO-236AB) 3-lead plastic surface-mount package with gull-wing leads; compact footprint (2.92 mm × 1.30 mm × 1.00 mm) suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives base current to bias transistor into active or saturation region; requires current-limiting resistor in most drive circuits. |
| 2 (Emitter) | Current return path | Common reference node for emitter-follower or grounded-emitter configurations; connected to system ground or load return. |
| 3 (Collector) | Output current terminal | Delivers amplified/saturated output current to load; placed on high-side or low-side switching nodes depending on topology. |
Key Features
| Feature | Design Value |
|---|---|
| hFE classification "40" | Guaranteed DC current gain of 250–630 at 100 mA, enabling predictable biasing in analog and digital interface circuits. |
| Low VCE(sat) | ≤ 0.7 V at 500 mA collector current reduces power loss and self-heating during switching duty cycles. |
| Complementary pairing | Designed as NPN counterpart to BC807/BC808 PNP transistors for push-pull and differential pair implementations. |
| Robust thermal rating | Junction temperature limit of 150 °C and storage range of –65 °C to +150 °C support operation in extended industrial environments. |
Applications
| Audio Frequency Driver | Low-Power Switching Load |
|---|---|
|
Use Scenario: Driving small speakers or piezo elements in portable audio devices with limited supply voltage (3.3–5 V). IC Role / Device Role / Timing Role: NPN switch/amplifier providing current gain and voltage buffering between microcontroller GPIO and speaker coil. Use Value: High hFE (250–630) allows full speaker drive with minimal base current, reducing MCU I/O loading and power consumption. |
Use Scenario: Controlling LED arrays, relays, or small solenoids in home automation and sensor interface modules. IC Role / Device Role / Timing Role: Saturated switch turning on/off loads up to 500 mA with low VCE(sat) to minimize heat generation. Use Value: Verified VCE(sat) ≤ 0.7 V ensures <100 mW conduction loss at 500 mA, eliminating need for external heatsink in space-constrained designs. |
| Signal Level Shifting | Current Mirror Reference |
|
Use Scenario: Translating logic-level signals between 3.3 V and 5 V domains in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Common-emitter level translator with fixed bias network to invert and shift voltage thresholds. Use Value: Tight hFE spread and stable VBE(on) ≤ 1.2 V enable repeatable threshold control across temperature and unit variance. |
Use Scenario: Building matched current sources in analog sensor conditioning circuits or precision reference generators. IC Role / Device Role / Timing Role: Active component in two-transistor current mirror configuration where hFE matching impacts accuracy. Use Value: hFE classification "40" provides known gain bounds (250–630), allowing design margining for mirror ratio error under process variation. |
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 |
|---|---|---|---|
| BC817-40LT1G | Same hFE class (250–630), identical SOT-23 package, but manufactured by ON Semiconductor post-Fairchild integration; RoHS-compliant matte finish. | No functional difference; fully interchangeable in existing designs requiring tape-and-reel delivery. | Select BC817-40LT1G when sourcing from ON Semiconductor's current production line with updated packaging nomenclature. |
| MMBT4401 | Higher VCEO (40 V vs. 45 V), lower hFE min (100 vs. 250), same SOT-23 footprint; VCE(sat) slightly higher (0.75 V @ 500 mA). | Acceptable for less demanding gain-critical circuits; may require base current adjustment due to lower hFE. | Choose MMBT4401 only if BC81740MTF supply is constrained and circuit tolerates reduced DC gain and marginally higher saturation loss. |
Compared with BC81740MTF, BC817-40LT1G offers identical electrical behavior and drop-in compatibility, while MMBT4401 trades gain and saturation performance for broader vendor availability-making BC81740MTF optimal for designs requiring guaranteed high hFE and low-loss switching.
Availability
BC81740MTF is available at Aetrix Electronics and suitable for audio driver stages, low-power switching loads, signal level shifting, and current mirror references requiring stable component supply across consumer electronics, industrial controls, and IoT edge devices.
Supply support for BC81740MTF 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC81740MTF belongs to the BC817/BC818 family of general-purpose NPN/PNP transistors designed for cost-sensitive, high-volume applications including AF amplification, digital switching, and interface buffering in compact PCB assemblies.
FAQ
What is the hFE range specified for BC81740MTF?
The BC81740MTF has a DC current gain (hFE) range of 250–630 when measured at VCE = 1 V and IC = 100 mA. This "40" classification ensures consistent amplification performance across units, supporting reliable biasing in analog and switching circuits without recalculating base resistors per lot.
What is the maximum collector-emitter voltage rating for BC81740MTF?
The BC81740MTF is rated for a maximum collector-emitter voltage (VCEO) of 45 V. This specification defines the absolute upper limit before avalanche breakdown occurs under open-base conditions and must be respected with appropriate safety margins in final circuit design.
Is BC81740MTF compatible with standard SOT-23 footprints?
Yes, BC81740MTF uses the JEDEC-standard SOT-23 (TO-236AB) package with pin 1 (Base), pin 2 (Emitter), and pin 3 (Collector) in standard gull-wing configuration. Its mechanical dimensions (2.92 mm × 1.30 mm × 1.00 mm) match IPC-7351B land pattern recommendations for SOT-23.
What is the power dissipation capability of BC81740MTF at room temperature?
At ambient temperature of 25 °C, BC81740MTF delivers 310 mW of power dissipation (PD). This value decreases linearly by 2.48 mW per °C rise above 25 °C, requiring thermal analysis for operation above 50 °C ambient or continuous high-current duty cycles.
How does BC81740MTF differ from BC81725MTF?
The BC81740MTF and BC81725MTF share identical package, voltage/current ratings, and thermal specs-but differ in hFE classification: BC81740MTF guarantees 250–630 gain, while BC81725MTF is binned 160–400. This makes BC81740MTF preferable for high-gain amplifier stages where minimum hFE must exceed 250.
BC81740MTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 800 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 100mA, 1V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BC81740MTF FAQ
1.How can I place an order for BC81740MTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC81740MTF 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 BC81740MTF reliable?
The price and inventory of BC81740MTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC81740MTF is usually 5 days.
3.What payment methods are accepted for BC81740MTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC81740MTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC81740MTF?
BC81740MTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC81740MTF 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 BC81740MTF?
For technical support, including BC81740MTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC81740MTF requirements.
6.How does Aetrix verify that BC81740MTF is sourced from the original manufacturer or authorized distributors?
All BC81740MTF 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 BC81740MTF meets industry standards.
7.What is the process for return or replacement of BC81740MTF?
All BC81740MTF units undergo pre-shipment inspection (PSI). If there is an issue with BC81740MTF, 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 BC81740MTF part is unused and in its original packaging.
Return procedure for BC81740MTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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