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onsemi BC859CMTF
- Part No.:
- BC859CMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC859CMTF.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,167
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Product details
Overview
BC859CMTF from ON Semiconductor is a PNP epitaxial silicon transistor optimized for low-noise amplifier and switching applications, with hFE 420–800, VCEO = −30 V, IC = −100 mA, PC = 310 mW, and fT = 150 MHz. It operates in SOT-23 package and is commonly used in audio preamplifier stages and precision current-switching circuits.
For engineers reviewing the BC859CMTF datasheet, pinout, applications, or equivalent options, key selection considerations include its low-noise performance (NF = 1.2 dB at 30–15 kHz), tight hFE binning (Class C), VCE(sat) ≤ −300 mV at IC = −100 mA, and compatibility with automated SMT assembly in thin-film and mixed-signal PCBs.
Technical Context
The BC859CMTF is a discrete PNP bipolar junction transistor with epitaxial base construction, designed for linear amplification and saturated switching. Its low noise figure and high DC current gain make it suitable for signal conditioning where gain stability and minimal added noise are critical.
It features complementary pairing with BC846–BC850 NPN devices and shares identical SOT-23 footprint and thermal characteristics across the BC856–BC860 family. Device marking "9DC" confirms Class C hFE (420–800) and tape-and-reel packaging (3000 pcs/reel).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| hFE | 420–800 - Guaranteed DC current gain range at VCE = −5 V, IC = −2 mA; enables predictable biasing in amplifier designs. |
| VCE(sat) | ≤ −300 mV at IC = −100 mA, IB = −5 mA - Low saturation voltage ensures minimal power loss in switching mode. |
| fT | 150 MHz - Unity-gain bandwidth supports RF amplification up to mid-VHF band and fast digital switching. |
| NF | 1.2 dB (30–15 kHz) - Measured noise figure enables use in high-fidelity audio front-ends without signal degradation. |
| Cob | 6 pF at VCB = −10 V - Output capacitance impacts high-frequency gain roll-off and stability in tuned circuits. |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; 1.30 mm × 2.90 mm footprint; 1.14 mm max height; JEDEC MO-215 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on. |
| 2 | Emitter | Current source terminal; connected to higher potential in PNP operation; defines reference for VBE and VCE. |
| 3 | Collector | Current sink terminal; output node for amplified or switched current; reverse-biased relative to emitter during conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise amplifier grade | NF = 1.2 dB at 30–15 kHz enables high-SNR audio preamp stages without external noise filtering. |
| Tight hFE binning (Class C) | Guaranteed 420–800 gain range reduces need for per-unit calibration in production amplifier circuits. |
| High fT / low Cob ratio | 150 MHz fT with only 6 pF Cob supports stable gain above 10 MHz in common-emitter configurations. |
| SOT-23 tape-and-reel packaging | Standardized 3000-piece reel (marking "9DC") enables direct integration into high-speed pick-and-place SMT lines. |
Applications
| Audio Preamp Stage | Current Mirror Reference |
|---|---|
Use Scenario: Low-level microphone signal amplification prior to ADC sampling in portable voice recorders. IC Role / Device Role / Timing Role: PNP small-signal amplifier configured in common-emitter topology with emitter degeneration. Use Value: 1.2 dB noise figure preserves SNR of µV-level signals; Class C hFE ensures consistent gain across production units without trimming. |
Use Scenario: Precision current replication in analog sensor signal conditioning ICs. IC Role / Device Role / Timing Role: Active component in two-transistor current mirror with matched layout. Use Value: Tight hFE tolerance (420–800) minimizes mirror ratio error; low VCE(sat) maintains headroom under load. |
| LED Driver Switch | Level-Shifting Interface |
Use Scenario: High-side switching of 20 mA indicator LEDs in industrial control panels with 3.3 V logic. IC Role / Device Role / Timing Role: Saturated PNP switch controlled by microcontroller GPIO via base resistor. Use Value: VCE(sat) ≤ −300 mV at IC = −100 mA limits power dissipation to <10 mW; SOT-23 allows dense LED array routing. |
Use Scenario: Bidirectional level translation between 5 V legacy peripherals and 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Discrete PNP element in open-collector translator circuit with pull-up resistors. Use Value: Fast fT (150 MHz) supports >10 Mbps data rates; low Cob prevents signal coupling between rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC859BMTF | hFE 200–450 (Class B), otherwise identical electrical specs and SOT-23 package. | Lower gain range increases need for gain compensation in fixed-bias amplifiers. | Select when tighter gain tolerance is unnecessary and cost optimization is prioritized over consistency. |
| MMBT3906LT1G | hFE 100–300 (min/max), VCEO = −40 V, fT = 250 MHz, same SOT-23 footprint. | Higher breakdown voltage and bandwidth but wider hFE spread; not low-noise rated. | Prefer for general-purpose switching where VCEO margin or speed outweighs noise sensitivity. |
Compared with BC859BMTF and MMBT3906LT1G, the BC859CMTF delivers superior gain consistency and verified low-noise performance in audio and precision analog roles-making it the optimal choice when signal integrity and production yield are critical.
Availability
BC859CMTF is available at Aetrix Electronics and suitable for audio preamplifiers, current mirror references, and LED driver switches requiring stable component supply, consistent hFE binning, and low-noise operation.
Supply support for BC859CMTF 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 power management, analog, sensors, and discrete devices, with emphasis on energy efficiency and reliability.
The BC859CMTF belongs to the BC856–BC860 PNP transistor family, engineered for high-volume consumer and industrial applications demanding low-noise amplification, precise gain control, and robust SMT manufacturability.
FAQ
What is the guaranteed hFE range for BC859CMTF?
The BC859CMTF is binned to Class C, with a guaranteed DC current gain (hFE) range of 420 to 800 at VCE = −5 V and IC = −2 mA. This tight specification ensures predictable biasing in production amplifier circuits without unit-level trimming. The device marking "9DC" on the SOT-23 package confirms this hFE classification for BC859CMTF.
Does BC859CMTF meet low-noise requirements for audio applications?
Yes, BC859CMTF is explicitly characterized for low-noise operation: NF = 1.2 dB measured at VCE = −5 V, IC = −200 µA, RG = 2 kΩ, and frequency range 30–15,000 Hz. This makes BC859CMTF suitable for microphone preamplifiers and other high-fidelity analog signal paths where SNR preservation is essential.
What is the maximum continuous collector current rating for BC859CMTF?
The BC859CMTF has a maximum continuous collector current (IC) rating of −100 mA at TA = 25°C. Derating applies above 25°C ambient, with thermal resistance RθJA ≈ 400°C/W typical for SOT-23. At full rated current, VCE(sat) remains ≤ −300 mV when driven with IB = −5 mA, ensuring efficient saturated switching.
Is BC859CMTF pin-compatible with other transistors in the BC856–BC860 series?
Yes, all BC856–BC860 variants-including BC859CMTF-share identical SOT-23 pinout (1: Base, 2: Emitter, 3: Collector) and mechanical dimensions. They differ only in hFE class, voltage ratings (VCEO, VCBO), and noise performance. This allows drop-in substitution within the same voltage class, provided hFE and noise requirements are met.
What packaging format does BC859CMTF ship in?
BC859CMTF ships in tape-and-reel format per JEDEC standard, with 3000 units per reel. The "TF" suffix in the part number explicitly denotes tape-and-reel packing, and the top-side marking "9DC" identifies the device as BC859 Class C in SOT-23. No bulk or tube options are specified for this variant.
BC859CMTF 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):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 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
BC859CMTF FAQ
1.How can I place an order for BC859CMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC859CMTF 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 BC859CMTF reliable?
The price and inventory of BC859CMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC859CMTF is usually 5 days.
3.What payment methods are accepted for BC859CMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC859CMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC859CMTF?
BC859CMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC859CMTF 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 BC859CMTF?
For technical support, including BC859CMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC859CMTF requirements.
6.How does Aetrix verify that BC859CMTF is sourced from the original manufacturer or authorized distributors?
All BC859CMTF 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 BC859CMTF meets industry standards.
7.What is the process for return or replacement of BC859CMTF?
All BC859CMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC859CMTF, 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 BC859CMTF part is unused and in its original packaging.
Return procedure for BC859CMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC859CMTF Tags
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