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onsemi BC859AMTF
- Part No.:
- BC859AMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC859AMTF.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,523
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Product details
Overview
BC859AMTF from ON Semiconductor is a PNP epitaxial silicon transistor designed for low-noise amplifier and switching applications in compact SOT-23 packages. It features VCEO = −30 V, IC = −100 mA, hFE = 110–220 (Class A), fT = 150 MHz, and NF = 1.2 dB (30–15 kHz), commonly used in audio preamplifier stages and signal inversion circuits.
For engineers reviewing the BC859AMTF datasheet, pinout, applications, or equivalent options, key selection criteria include its low-noise performance at 200 µA bias, SOT-23 footprint compatibility with automated assembly, Class A hFE range, and −30 V VCEO rating for general-purpose low-voltage PNP switching.
Technical Context
This device operates as a discrete PNP bipolar junction transistor with epitaxial base construction, optimized for low-noise small-signal amplification and fast switching. Its hFE classification (A: 110–220) and 1.2 dB noise figure at 30–15 kHz are specified under VCE = −5 V, IC = −200 µA conditions.
The BC859AMTF shares the BC856–BC860 family's mechanical SOT-23 outline and pinout (1: Base, 2: Emitter, 3: Collector), with VCBO = −30 V, VCEO = −30 V, and VEBO = −5 V absolute maximum ratings. It complements NPN types BC846–BC850 in push-pull and differential pair configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 V - Maximum collector-emitter voltage before breakdown; defines safe operating range in low-voltage PNP switch or amplifier designs. |
| IC (DC) | −100 mA - Continuous collector current limit; supports moderate-power signal handling without thermal derating at TA = 25°C. |
| hFE (Class A) | 110–220 - DC current gain range at VCE = −5 V, IC = −2 mA; enables predictable biasing in linear amplifier stages. |
| fT | 150 MHz - Current gain–bandwidth product at VCE = −5 V, IC = −10 mA; suitable for audio and low-MHz RF amplification. |
| Noise Figure | 1.2 dB (30–15 kHz) - Measured with RG = 2 kΩ; confirms suitability for high-fidelity audio preamp input stages. |
| PC | 310 mW - Maximum power dissipation in SOT-23 package; sets thermal limits for continuous operation on standard PCBs. |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; standardized 3-pin outline measuring 2.90 mm × 1.30 mm × 1.00 mm (L × W × H). Moisture sensitivity level (MSL) not specified in source documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to enable conduction. |
| 2 | Emitter | Current source terminal in PNP configuration; connected to higher potential rail in common-emitter amplifier or switch topologies. |
| 3 | Collector | Current sink terminal; output node where amplified or switched current flows toward lower-potential load or ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise amplifier grade | 1.2 dB noise figure at 30–15 kHz enables use in microphone preamps and sensor front-ends without added noise degradation. |
| Class A hFE binning | 110–220 gain range ensures consistent DC bias stability across production lots in linear amplifier designs. |
| SOT-23 tape-and-reel packaging | 3000-unit reel format supports high-speed pick-and-place assembly in automated manufacturing lines. |
| Complementary NPN pairing | Designed as PNP counterpart to BC846–BC850 series, enabling matched differential pairs and push-pull output stages. |
Applications
| Audio Preamp Stage | Level Shifting Circuit |
|---|---|
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable audio devices. IC Role / Device Role / Timing Role: Small-signal PNP amplifier in common-emitter configuration with emitter degeneration for linearity. Use Value: 1.2 dB noise figure and 150 MHz fT preserve signal integrity across 20 Hz–20 kHz bandwidth without requiring external noise filtering. |
Use Scenario: Converting logic-level signals between incompatible voltage domains (e.g., 5 V MCU to 3.3 V analog subsystem). IC Role / Device Role / Timing Role: Active low-side level shifter using PNP emitter-follower topology for inverted translation. Use Value: −30 V VCEO and −100 mA IC allow robust operation across industrial logic families while maintaining sub-100 ns propagation delay. |
| LED Driver Switch | Differential Pair Input |
Use Scenario: Driving indicator LEDs or low-current optocoupler inputs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Saturated PNP switch controlling LED anode connection to positive rail. Use Value: VCE(sat) ≤ −90 mV at IC = −10 mA minimizes power loss and heat generation in space-constrained LED modules. |
Use Scenario: Forming the input stage of a precision operational transconductance amplifier (OTA) or comparator. IC Role / Device Role / Timing Role: Matched PNP pair with complementary BC846–BC850 NPNs to implement high-CMRR differential input. Use Value: Tight hFE binning (Class A) and low Cob (6 pF) reduce gain mismatch and capacitive coupling errors in high-frequency differential amplifiers. |
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 |
|---|---|---|---|
| BC857AMTF | VCEO = −45 V, VCBO = −50 V; otherwise identical SOT-23 pinout and hFE Class A range. | Higher voltage headroom supports 36 V industrial bus interfaces where BC859AMTF's −30 V rating is insufficient. | Select BC857AMTF when system supply exceeds 24 V but same noise and gain behavior is required. |
| MMBT3906LT1G | Same VCEO = −40 V, hFE = 100–300 (no binning), slightly higher VBE(on) (−0.65 V typ); SOT-23 compatible. | Broader hFE tolerance increases bias spread in linear designs; preferred for cost-sensitive digital switching over precision analog. | Choose MMBT3906LT1G for non-critical switching where tighter hFE control is unnecessary and second-source availability is prioritized. |
Compared with BC859AMTF, BC857AMTF offers higher voltage capability without altering noise or gain characteristics, while MMBT3906LT1G trades hFE consistency for broader market availability and lower unit cost in non-analog applications.
Availability
BC859AMTF is available at Aetrix Electronics and suitable for audio preamplifier design, logic-level translation, and LED driver switching requiring stable component supply and consistent Class A hFE performance.
Supply support for BC859AMTF 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 headquarters in Phoenix, Arizona.
The BC859AMTF belongs to the BC856–BC860 PNP transistor family, engineered for low-noise amplification and reliable switching in space-constrained consumer, computing, and industrial electronics.
FAQ
What is the pin configuration of BC859AMTF?
The BC859AMTF uses standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This configuration is confirmed in the Fairchild BC856–BC860 datasheet Rev. B and applies identically to BC859AMTF as part of the same family. No alternate pinouts or variants exist for this orderable part number.
Does BC859AMTF have a specified moisture sensitivity level (MSL)?
No MSL rating is provided in the BC856–BC860 datasheet Rev. B or related ON Semiconductor documentation for BC859AMTF. The device is supplied in tape-and-reel packaging per ordering code "TF", but JEDEC MSL classification is not stated. Users should follow standard SOT-23 handling guidelines unless updated specifications are published.
What is the maximum operating temperature for BC859AMTF?
The BC859AMTF has a maximum junction temperature (TJ) of 150°C and storage temperature range of −65°C to +150°C, as specified in the Absolute Maximum Ratings table. These limits apply under all operating conditions and must be respected to ensure long-term reliability and parametric stability.
How does BC859AMTF differ from BC859BMTF and BC859CMTF?
BC859AMTF, BC859BMTF, and BC859CMTF share identical electrical and mechanical specifications except for hFE range: BC859AMTF is Class A (110–220), BC859BMTF is Class B (200–450), and BC859CMTF is Class C (420–800). All use SOT-23 package and "TF" tape-and-reel packing.
Is BC859AMTF suitable for RF amplification up to 100 MHz?
Yes - BC859AMTF has a current gain–bandwidth product (fT) of 150 MHz at VCE = −5 V and IC = −10 mA, confirming usable gain well above 100 MHz. Its 6 pF output capacitance (Cob) and low noise figure further support stable small-signal RF amplification in VHF front-end stages.
BC859AMTF 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:
- 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
BC859AMTF FAQ
1.How can I place an order for BC859AMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC859AMTF 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 BC859AMTF reliable?
The price and inventory of BC859AMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC859AMTF is usually 5 days.
3.What payment methods are accepted for BC859AMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC859AMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC859AMTF?
BC859AMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC859AMTF 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 BC859AMTF?
For technical support, including BC859AMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC859AMTF requirements.
6.How does Aetrix verify that BC859AMTF is sourced from the original manufacturer or authorized distributors?
All BC859AMTF 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 BC859AMTF meets industry standards.
7.What is the process for return or replacement of BC859AMTF?
All BC859AMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC859AMTF, 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 BC859AMTF part is unused and in its original packaging.
Return procedure for BC859AMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC859AMTF Tags
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MMBT3906-7-F
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