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onsemi BC81725MTF
- Part No.:
- BC81725MTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC81725MTF.pdf
- Description:
- TRANS NPN 45V 0.8A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
BC81725MTF from ON Semiconductor is an NPN epitaxial silicon transistor in SOT-23 package, rated for 45 V VCEO, 800 mA IC, and 310 mW power dissipation, with hFE of 160–400 at IC = 100 mA; used in low-power switching and AF-driver stages.
For engineers reviewing the BC81725MTF datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal characteristics, SOT-23 terminal mapping, and validated alternative transistors for discrete BJT selection in cost-sensitive consumer and industrial signal-path designs.
Technical Context
This device operates as a general-purpose NPN bipolar junction transistor with DC current gain (hFE) classified to 160–400 at VCE = 1 V and IC = 100 mA, and exhibits VCE(sat) ≤ 0.7 V at IC = 500 mA / IB = 50 mA. Its fT is 100 MHz under 5 V VCE, 10 mA IC, enabling use in audio-frequency amplification and moderate-speed switching.
Thermal resistance RθJA is 403 °C/W on standard FR-4 PCB (76 mm × 114 mm), and maximum junction temperature is 150 °C. It complements BC807 PNP transistors and shares identical SOT-23 footprint and marking convention (8FB) across the BC817 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; supports 3.3 V/5 V/12 V logic-level switching and low-voltage power rail control. |
| IC (DC) | 800 mA - Continuous collector current handling; suitable for driving relays, LEDs, and small solenoids without external heat sinking. |
| hFE (100 mA) | 160–400 - Confirmed DC current gain range at VCE = 1 V; enables predictable base drive sizing in linear amplifier and saturated switch configurations. |
| VCE(sat) | ≤ 0.7 V at IC = 500 mA / IB = 50 mA - Low saturation voltage reduces conduction loss and self-heating in switching applications. |
| fT | 100 MHz - Current gain bandwidth product; supports stable operation up to mid-audio frequencies (e.g., 20 kHz class AB preamp stages). |
| PD | 310 mW - Power dissipation limit at 25 °C ambient; derates linearly by 2.48 mW/°C above 25 °C for thermal design margining. |
Pinout & Package
SOT-23 (JEDEC TO-236AB) 3-lead surface-mount package with gull-wing leads, 1.30 mm body width, and 2.92 mm length; optimized for automated placement and reflow soldering on high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives base current to bias transistor into active or saturation region; requires series resistor to limit IB per hFE and load requirements. |
| 2 (Emitter) | Current return path | Connected to ground or low-side reference; establishes common node for emitter-follower or common-emitter topologies. |
| 3 (Collector) | Output current terminal | Delivers switched or amplified current to load; must be routed with adequate copper area for thermal management at >300 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Switching & amplification capability | Validated for both linear AF-driver stages and digital on/off switching-no topology-specific redesign required. |
| Complementary PNP pairing | Designed as direct counterpart to BC807 series, enabling matched push-pull output stages with consistent thermal and gain behavior. |
| Standardized SOT-23 footprint | Shares identical land pattern and solder profile with BC817xx/BC818xx variants-supports single PCB revision across hFE grades. |
| Low VBE(on) | 1.2 V at IC = 300 mA ensures reliable turn-on from 3.3 V microcontroller GPIOs without level-shifting circuitry. |
Applications
| Audio Pre-Amplifier Stage | Microcontroller GPIO Driver |
|---|---|
|
Use Scenario: Amplifying line-level analog signals (e.g., from MEMS microphone or DAC output) before ADC sampling in portable audio devices. IC Role / Device Role / Timing Role: NPN BJT configured in common-emitter topology to provide 20–40 dB voltage gain with minimal distortion at ≤20 kHz. Use Value: hFE stability across temperature and fT ≥ 100 MHz ensure flat frequency response and low THD in battery-powered audio front-ends. |
Use Scenario: Driving LED indicators, small relays, or MOSFET gates from 3.3 V or 5 V MCU outputs in industrial HMI panels. IC Role / Device Role / Timing Role: Low-side switch with forced β = 10 to guarantee saturation under worst-case IOH/IOL limits of microcontrollers. Use Value: VCE(sat) ≤ 0.7 V minimizes power loss and self-heating during continuous duty-cycle operation at 500 mA loads. |
| Low-Power Output Stage | Signal-Level Translation |
|
Use Scenario: Delivering buffered audio or sensor signals to downstream analog circuits in space-constrained IoT edge nodes. IC Role / Device Role / Timing Role: Emitter-follower configuration providing low-output-impedance drive while preserving signal integrity and DC level. Use Value: High hFE (160–400) ensures minimal base current draw, extending battery life in always-on sensor interface modules. |
Use Scenario: Level-shifting between 1.8 V logic domains and 3.3 V peripherals in multi-rail embedded systems. IC Role / Device Role / Timing Role: Active pull-up/pull-down element in open-collector interface, enabling bidirectional voltage translation without dedicated ICs. Use Value: VEBO = 5 V and fast switching enable robust operation across mixed-voltage I²C or UART bus segments. |
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 |
|---|---|---|---|
| BC817-25-7-F (Diodes Inc.) | Identical VCEO (45 V), IC (800 mA), hFE (160–400), and SOT-23 package; same 8FB marking; RoHS-compliant tape-and-reel packaging. | No functional deviation; validated for same AF-driver, switching, and buffer roles; accepted in automotive AEC-Q200 stress-tested designs. | Select when requiring Diodes Inc. supply chain continuity or dual-sourcing for long-lifecycle industrial programs. |
| MMBT3904LT1G (ON Semiconductor) | Lower VCEO (40 V), lower IC (200 mA), hFE 100–300; same SOT-23 footprint but not pin-compatible due to different internal die layout and thermal performance. | Not suitable for >300 mA loads or 12 V rail switching; limited to signal-level amplification and low-current logic interfacing. | Choose only for ultra-low-power signal conditioning where BC81725MTF's higher current capability is unnecessary. |
Compared with BC81725MTF, BC817-25-7-F offers full functional and mechanical equivalence with alternate sourcing, while MMBT3904LT1G provides a lower-power, non-drop-in option requiring layout review and derating for current/voltage margins.
Availability
BC81725MTF is available at Aetrix Electronics and suitable for audio pre-amplifier stages, microcontroller GPIO drivers, and low-power output stages requiring stable component supply, consistent hFE grading, and SOT-23 footprint reliability.
Supply support for BC81725MTF 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 management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BC81725MTF belongs to ON Semiconductor's general-purpose discrete transistor portfolio, designed for cost-effective, high-yield implementation in consumer electronics, industrial controls, and IoT edge devices where proven reliability and standardized packaging are critical.
FAQ
What is the hFE range specified for BC81725MTF?
The BC81725MTF has a guaranteed DC current gain (hFE) range of 160–400 when measured at VCE = 1 V and IC = 100 mA. This classification ("25") distinguishes it from BC81716MTF (100–250) and BC81740MTF (250–630), enabling precise base-drive design for consistent switching or amplification behavior in the BC81725MTF.
Is BC81725MTF pin-compatible with BC817-25-7-F?
Yes, BC81725MTF is pin-compatible with Diodes Inc.'s BC817-25-7-F: both use identical SOT-23 pinout (Base–Emitter–Collector), share the same 8FB top-side marking, and meet equivalent absolute maximum ratings and electrical characteristics. No PCB changes are required when substituting between these two sources.
What is the maximum continuous collector current for BC81725MTF?
The BC81725MTF supports a maximum continuous DC collector current (IC) of 800 mA at TA = 25 °C. Derating applies above ambient temperature-power dissipation decreases by 2.48 mW/°C-and actual usable current depends on PCB copper area, airflow, and thermal interface conditions in the final design using BC81725MTF.
Can BC81725MTF replace BC817-16 or BC817-40 in existing designs?
BC81725MTF can replace BC817-16 or BC817-40 only if the circuit tolerates its specific hFE range (160–400). Substituting into a design originally using BC817-16 (100–250) may increase base current demand; using it in place of BC817-40 (250–630) may reduce gain margin. Verify bias network stability and saturation depth in the target application before adopting BC81725MTF.
What is the thermal resistance (RθJA) of BC81725MTF?
The BC81725MTF has a junction-to-ambient thermal resistance (RθJA) of 403 °C/W when mounted on a standard FR-4 PCB (76 mm × 114 mm, 1.57 mm thick) with minimum recommended land pattern. This value assumes no additional copper pour or thermal vias; adding thermal relief improves heat dissipation and allows higher sustained current in BC81725MTF applications.
BC81725MTF 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:
- 160 @ 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
BC81725MTF FAQ
1.How can I place an order for BC81725MTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC81725MTF 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 BC81725MTF reliable?
The price and inventory of BC81725MTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC81725MTF is usually 5 days.
3.What payment methods are accepted for BC81725MTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC81725MTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC81725MTF?
BC81725MTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC81725MTF 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 BC81725MTF?
For technical support, including BC81725MTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC81725MTF requirements.
6.How does Aetrix verify that BC81725MTF is sourced from the original manufacturer or authorized distributors?
All BC81725MTF 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 BC81725MTF meets industry standards.
7.What is the process for return or replacement of BC81725MTF?
All BC81725MTF units undergo pre-shipment inspection (PSI). If there is an issue with BC81725MTF, 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 BC81725MTF part is unused and in its original packaging.
Return procedure for BC81725MTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC81725MTF Tags
-
MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
onsemi
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