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onsemi BC857AMTF
- Part No.:
- BC857AMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC857AMTF.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,056
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Product details
Overview
BC857AMTF from ON Semiconductor is a PNP epitaxial silicon transistor in SOT-23 package, rated for -45 V VCEO, -100 mA IC, 310 mW PC, with hFE of 110–220 at -5 V VCE and -2 mA IC, used in low-noise amplifier and general-purpose switching circuits.
For engineers reviewing the BC857AMTF datasheet, pinout, applications, or equivalent options, key selection criteria include verified VCEO/VCBO ratings, hFE classification band (A), SOT-23 terminal assignment, and noise figure (2–10 dB) across bias conditions.
Technical Context
This device operates as a discrete PNP bipolar junction transistor with fixed emitter-base and collector-base junctions optimized for linear amplification and saturated switching. Its DC current gain is binned per hFE classification A (110–220), and it exhibits VBE(sat) ≤ −700 mV at IC = −10 mA / IB = −0.5 mA.
Thermal performance is defined by TJ = 150 °C maximum junction temperature and TSTG = −65 to 150 °C storage range. Output capacitance Cob is 6 pF at VCB = −10 V, f = 1 MHz, supporting stable high-frequency small-signal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum allowable collector-emitter voltage before breakdown under open-base condition. |
| IC | −100 mA: Continuous DC collector current rating defining safe linear/switching operating envelope. |
| PC | 310 mW: Maximum power dissipation at TA = 25 °C, limiting thermal rise in PCB-mounted SOT-23 layout. |
| hFE | 110–220: Verified DC current gain range at VCE = −5 V, IC = −2 mA, enabling predictable bias design. |
| fT | 150 MHz: Current gain-bandwidth product confirming usable RF amplification up to VHF band. |
| NF | 2–10 dB: Noise figure at VCE = −5 V, IC = −200 µA, RG = 2 kΩ, f = 1 kHz, suitable for low-noise preamp stages. |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads, 1.90 mm × 1.30 mm footprint, 0.95 mm height, and standard JEDEC MO-215 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control electrode for forward-biased base-emitter junction; requires negative bias relative to emitter for PNP conduction. |
| 2 | Emitter | Current source terminal; connected to higher potential rail in common-emitter switching configurations. |
| 3 | Collector | Current sink terminal; tied to load and lower-potential node in amplifier or switch topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise operation | 2 dB NF at 1 kHz (BC857A variant), enabling use in audio preamplifier input stages without added noise degradation. |
| hFE binning (Class A) | Guaranteed 110–220 hFE range ensures consistent DC bias point across production lots for stable amplifier Q-point design. |
| High VCBO rating | −50 V collector-base breakdown supports robust operation in inductive load switching with flyback voltage spikes. |
| SOT-23 tape-and-reel packaging | 3000-unit reel format (BC857AMTF suffix) enables automated pick-and-place assembly in high-volume manufacturing. |
Applications
| Audio Signal Amplification | General-Purpose Switching |
|---|---|
|
Use Scenario: Low-level microphone or sensor signal amplification in portable audio devices. IC Role / Device Role / Timing Role: Discrete PNP transistor configured in common-emitter topology for voltage gain. Use Value: 2 dB noise figure and 150 MHz fT preserve signal integrity while delivering >20 dB gain at audio frequencies. |
Use Scenario: Digital logic-level interface driving LED indicators or small relays in industrial control panels. IC Role / Device Role / Timing Role: Saturated switch controlling current path between VCC and load. Use Value: VCE(sat) ≤ −90 mV at IC = −10 mA ensures minimal power loss and heat generation during on-state. |
| Complementary Pair Circuits | Power Supply Regulation |
|
Use Scenario: Complement to BC847A/BC848A NPN transistors in push-pull output stages or differential amplifiers. IC Role / Device Role / Timing Role: Matched PNP half of complementary BJT pair for symmetrical gain and distortion performance. Use Value: Same SOT-23 package and hFE binning enable thermal tracking and balanced current handling in dual-rail designs. |
Use Scenario: Pass transistor or error amplifier element in linear voltage regulators for embedded systems. IC Role / Device Role / Timing Role: Regulating element maintaining constant output voltage via feedback-controlled base current. Use Value: −45 V VCEO and 310 mW PC support operation across 3.3 V to 24 V input ranges with adequate SOA margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857BMTF | hFE = 200–450 (Class B), otherwise identical electrical and mechanical specs. | Higher gain enables reduced base drive current in low-power switching but may reduce stability in wideband amplifiers. | Select BC857BMTF when tighter bias control or lower base current is required; verify loop stability in feedback circuits. |
| MMBT3906LT1G | Same SOT-23 package, −40 V VCEO, −200 mA IC, hFE = 100–300, but no guaranteed low-noise binning. | Broader IC rating suits higher-current loads, but lacks BC857AMTF's 2 dB NF specification for sensitive analog front-ends. | Choose MMBT3906LT1G for cost-sensitive high-current switching; retain BC857AMTF where noise or gain consistency is critical. |
Compared with BC857BMTF and MMBT3906LT1G, BC857AMTF provides the narrowest hFE range (110–220) and lowest specified noise figure-making it preferred for precision low-noise amplification where predictable gain and minimal signal degradation are mandatory.
Availability
BC857AMTF is available at Aetrix Electronics and suitable for audio signal amplification, general-purpose switching, and complementary pair circuits requiring stable component supply, consistent hFE binning, and low-noise performance.
Supply support for BC857AMTF 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, and discrete components for automotive, industrial, and consumer applications.
The BC857AMTF belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for reliable, cost-effective amplification and switching in space-constrained surface-mount applications.
FAQ
What is the hFE range for BC857AMTF?
The BC857AMTF has a guaranteed DC current gain (hFE) range of 110 to 220 when measured at VCE = −5 V and IC = −2 mA. This Class A binning ensures predictable biasing in amplifier and switching circuits, and is explicitly confirmed in the Fairchild/ON Semiconductor BC856–BC860 datasheet Rev. B.
Is BC857AMTF RoHS compliant?
Yes, BC857AMTF is RoHS compliant and lead-free, consistent with ON Semiconductor's transition to environmentally compliant packaging after the Fairchild integration. The SOT-23 package uses matte tin plating, and full compliance documentation is available through ON Semiconductor's official product page and material declarations.
What does the "M" and "TF" suffix mean in BC857AMTF?
In BC857AMTF, "M" denotes matte-finish package surface treatment for improved solderability and optical recognition in automated assembly, while "TF" indicates tape-and-reel packaging with 3000 units per reel-standard for SMT placement equipment compatibility and high-volume manufacturing logistics.
Can BC857AMTF replace BC857A in existing designs?
Yes, BC857AMTF is functionally and electrically identical to BC857A, with identical absolute maximum ratings, electrical characteristics, and SOT-23 pinout. The "MTF" suffix adds tape-and-reel packaging and matte finish but does not alter device performance or footprint-making it a direct fit for legacy BC857A layouts.
What is the maximum operating junction temperature of BC857AMTF?
The BC857AMTF has a maximum junction temperature (TJ) of 150 °C, as specified in the Absolute Maximum Ratings table of its datasheet. This rating defines the upper thermal limit for reliable operation and must be respected in thermal design, especially when dissipating near its 310 mW power limit in ambient temperatures above 25 °C.
BC857AMTF 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:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 110 @ 2mA, 5V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BC857AMTF FAQ
1.How can I place an order for BC857AMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857AMTF 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 BC857AMTF reliable?
The price and inventory of BC857AMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857AMTF is usually 5 days.
3.What payment methods are accepted for BC857AMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857AMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857AMTF?
BC857AMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857AMTF 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 BC857AMTF?
For technical support, including BC857AMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857AMTF requirements.
6.How does Aetrix verify that BC857AMTF is sourced from the original manufacturer or authorized distributors?
All BC857AMTF 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 BC857AMTF meets industry standards.
7.What is the process for return or replacement of BC857AMTF?
All BC857AMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC857AMTF, 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 BC857AMTF part is unused and in its original packaging.
Return procedure for BC857AMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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