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onsemi BC858AMTF
- Part No.:
- BC858AMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC858AMTF.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,402
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Product details
Overview
BC858AMTF from ON Semiconductor is a PNP epitaxial silicon transistor in SOT-23 package, rated for -30 V VCEO, -100 mA IC, and 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 in portable power management and signal conditioning stages.
For engineers reviewing the BC858AMTF datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SOT-23 terminal mapping, hFE classification (A-grade), noise figure (2 dB @ 1 kHz), and direct alternatives for discrete PNP switching and amplification design validation.
Technical Context
The BC858AMTF operates as a medium-gain, low-noise PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its VCEO = -30 V and VCBO = -30 V define its safe operating range in negative-rail bias configurations, while fT = 150 MHz supports audio and low-MHz signal handling.
Designed as a complement to BC846–BC850 NPN series, it shares SOT-23 footprint and thermal characteristics (TJ = 150°C, TSTG = -65 to 150°C) with matched Cob = 6 pF and NF = 2 dB (BC856/857/858 group), enabling balanced push-pull and differential pair implementations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30 V - Maximum collector-emitter voltage before breakdown in common-emitter configuration; defines rail compatibility in -24 V or -15 V systems. |
| IC | -100 mA - Continuous DC collector current rating; supports load switching up to ~100 mA with adequate heatsinking. |
| hFE | 110–220 - DC current gain range at VCE = -5 V, IC = -2 mA; ensures predictable base drive sizing for switching saturation. |
| VBE(sat) | -700 to -900 mV - Base-emitter saturation voltage at IC = -10 mA / -100 mA; enables accurate low-voltage bias network design. |
| NF | 2 dB - Noise figure at VCE = -5 V, IC = -200 µA, RG = 2 kΩ, f = 1 kHz; suitable for low-noise preamplifier stages. |
| fT | 150 MHz - Current gain bandwidth product at VCE = -5 V, IC = -10 mA; supports stable operation up to mid-audio frequencies. |
| PC | 310 mW - Maximum power dissipation at TA = 25°C; requires derating above 25°C ambient per thermal resistance curve. |
Pinout & Package
SOT-23 plastic surface-mount package with 3-pin configuration, 1.30 mm × 0.95 mm body size, 0.95 mm lead pitch, and matte finish (denoted by "-M" suffix); tape-and-reel packaging (3000 pcs/reel) indicated by "-TF" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input node; requires current-limited drive to achieve target hFE-dependent collector current. |
| 2 | Emitter | Common reference terminal in common-base or common-collector configurations; tied to most-positive supply in PNP switching. |
| 3 | Collector | Output current sink node; connects to load and negative rail in high-side switch or amplifier output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise performance | 2 dB noise figure (BC856/857/858 group) enables use in microphone preamps and sensor signal conditioning without added filtering. |
| hFE classification A-grade | 110–220 hFE range ensures consistent gain matching across production lots for analog feedback loops and current mirrors. |
| Complementary NPN pairing | Direct counterpart to BC847/848/849 series; simplifies dual-rail amplifier and H-bridge driver layout with matched thermal and gain profiles. |
| SOT-23 tape-and-reel packaging | 3000-unit reels support automated pick-and-place assembly; matte finish improves solder paste adhesion and reduces tombstoning risk. |
Applications
| Portable Audio Amplifiers | Power Supply Enable Switches |
|---|---|
Use Scenario: Low-voltage headphone driver stage in battery-powered media players requiring minimal quiescent current and low THD. IC Role / Device Role / Timing Role: PNP small-signal amplifier configured in common-emitter topology to boost line-level signals before DAC output buffering. Use Value: 2 dB noise figure and 150 MHz fT preserve audio fidelity up to 20 kHz with <1% distortion at 10 mW output. |
Use Scenario: High-side enable switch controlling 3.3 V or 5 V rails in microcontroller-based IoT sensor nodes. IC Role / Device Role / Timing Role: Saturated PNP switch turning on/off LDO inputs or PMIC enable lines via GPIO-driven base control. Use Value: -700 mV VBE(sat) at -10 mA ensures reliable turn-on with 1.8 V logic, while -30 V VCEO accommodates transient overvoltage events. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Modules |
Use Scenario: Current-to-voltage conversion and level-shifting for thermistor or RTD bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Transimpedance amplifier front-end stage with emitter-follower buffer to isolate bridge impedance from ADC input. Use Value: 110–220 hFE enables precise gain setting with 1% resistor tolerance; 6 pF Cob minimizes phase shift at 100 Hz–1 kHz measurement bandwidth. |
Use Scenario: LED indicator driver and relay coil control in dashboard lighting and door lock actuation circuits. IC Role / Device Role / Timing Role: General-purpose PNP switch sinking current from 12 V automotive supply through resistive or inductive loads. Use Value: 310 mW PC and -100 mA IC support continuous 20 mA LED drive or 50 mA relay hold current with <50°C temperature rise on FR-4 PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857AMTF | VCEO = -45 V, VCBO = -50 V; otherwise identical hFE, noise, and package. | Better suited for higher-voltage industrial interfaces where -30 V margin is insufficient. | Select BC857AMTF when operating beyond -30 V collector-emitter differential is required; same footprint and drive requirements. |
| MMBT3906LT1G | hFE = 100–300 (wider spread), VCEO = -40 V, Cob = 8 pF, NF = 10 dB (higher noise). | Higher voltage rating but lower noise performance limits use in precision analog stages. | Choose MMBT3906LT1G only for cost-sensitive switching applications where noise and gain consistency are secondary. |
Compared with BC858AMTF, BC857AMTF offers higher voltage headroom without sacrificing gain or noise, while MMBT3906LT1G trades noise and hFE consistency for broader availability and lower unit cost in non-critical digital switching roles.
Availability
BC858AMTF is available at Aetrix Electronics and suitable for portable audio amplifiers, power supply enable switches, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BC858AMTF 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 BC858AMTF belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, designed for cost-effective, reliable discrete switching and amplification in space-constrained, high-volume applications.
FAQ
What is the hFE range for BC858AMTF?
The BC858AMTF has a guaranteed DC current gain (hFE) range of 110 to 220 when measured at VCE = -5 V and IC = -2 mA. This A-grade classification ensures tighter gain distribution than B- or C-grade variants, supporting repeatable biasing in analog circuits and predictable saturation behavior in switching designs using the BC858AMTF.
Is BC858AMTF pin-compatible with BC847 or BC848?
No - BC858AMTF is a PNP transistor while BC847 and BC848 are NPN devices; they share the same SOT-23 pinout (1=Base, 2=Emitter, 3=Collector) but require opposite polarity biasing. The BC858AMTF serves as the complementary PNP counterpart to those NPN types, enabling push-pull and differential pair topologies when used together in the same circuit.
What does the "-M" and "-TF" suffix mean in BC858AMTF?
The "-M" suffix indicates a matte-finish SOT-23 package that improves solder paste wetting and reduces tombstoning during reflow; "-TF" denotes tape-and-reel packaging with 3000 units per reel, optimized for automated SMT assembly. Together, they confirm the BC858AMTF is supplied in production-ready form for high-yield manufacturing environments.
Can BC858AMTF be used in low-noise amplifier designs?
Yes - the BC858AMTF belongs to the BC856–BC860 family's low-noise group (NF = 2 dB at 1 kHz), making it suitable for preamplifier stages in audio, sensor interface, and instrumentation circuits. Its 6 pF Cob and 150 MHz fT further support stable, wideband operation when properly biased, confirming its suitability for precision analog use with the BC858AMTF.
What is the maximum junction temperature for BC858AMTF?
The BC858AMTF has a maximum rated junction temperature (TJ) of 150°C, with storage temperature ranging from -65°C to +150°C. Thermal derating begins above 25°C ambient, and the device's 310 mW power dissipation rating assumes free-air conditions; PCB copper area and airflow must be considered to maintain safe TJ in sustained operation of the BC858AMTF.
BC858AMTF 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
BC858AMTF FAQ
1.How can I place an order for BC858AMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC858AMTF 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 BC858AMTF reliable?
The price and inventory of BC858AMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC858AMTF is usually 5 days.
3.What payment methods are accepted for BC858AMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC858AMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC858AMTF?
BC858AMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC858AMTF 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 BC858AMTF?
For technical support, including BC858AMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC858AMTF requirements.
6.How does Aetrix verify that BC858AMTF is sourced from the original manufacturer or authorized distributors?
All BC858AMTF 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 BC858AMTF meets industry standards.
7.What is the process for return or replacement of BC858AMTF?
All BC858AMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC858AMTF, 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 BC858AMTF part is unused and in its original packaging.
Return procedure for BC858AMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC858AMTF Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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