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onsemi BC548A_J35Z
- Part No.:
- BC548A_J35Z
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC548A_J35Z.pdf
- Description:
- TRANS NPN 30V 0.1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,633
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Product details
Overview
BC548A_J35Z from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor optimized for low-noise amplification and medium-speed switching in discrete analog circuits, with VCEO = 30 V, IC = 100 mA, hFE = 110–220 (Class A), and TO-92 package. It operates reliably in audio preamplifier stages, sensor signal conditioning, and digital logic interface buffers where moderate gain and low saturation voltage are required.
For engineers reviewing the BC548A_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain classification (Class A), collector-emitter breakdown voltage (30 V), saturation voltage at 10 mA/0.5 mA drive (≤250 mV), noise figure (2.0–10.0 dB), and TO-92 mechanical compatibility for through-hole prototyping and legacy board replacement.
Technical Context
This device belongs to the BC546–BC550 family of complementary NPN/PNP transistors standardized under JEDEC TO-92. Its epitaxial base construction enables stable hFE across temperature and consistent VBE(on) behavior at IC = 2 mA (580–700 mV).
It supports linear operation up to fT = 300 MHz at IC = 10 mA and exhibits Cob = 3.5–6.0 pF at VCB = 10 V, making it suitable for audio-frequency amplification and sub-MHz switching where capacitance and bandwidth trade-offs are well-characterized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before avalanche breakdown; defines usable supply headroom in amplifier or switch designs. |
| hFE (Class A) | 110–220 - Confirmed DC current gain range at VCE = 5 V, IC = 2 mA; ensures predictable biasing in Class-A amplifiers. |
| VCE(sat) | ≤250 mV at IC = 10 mA, IB = 0.5 mA - Low saturation voltage minimizes power loss and heating in switching applications. |
| IC (max) | 100 mA - Absolute maximum continuous collector current; sets upper limit for load-driving capability. |
| fT | 300 MHz - Current gain-bandwidth product at VCE = 5 V, IC = 10 mA; confirms suitability for audio and low-RF signal paths. |
| Noise Figure | 2.0–10.0 dB at VCE = 5 V, IC = 200 μA, f = 1 kHz, RG = 2 kΩ - Quantified low-noise performance critical for microphone preamps and sensor front-ends. |
Pinout & Package
BC548A_J35Z is housed in a standard JEDEC TO-92 plastic package with straight leads (bulk packing variant). The package dimensions conform to Fairchild/ON Semiconductor specification for 3-lead through-hole mounting, with lead spacing of 0.2 inch (5.08 mm) and body height ≤ 4.7 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main current output terminal | Connected to load or next stage; must remain within VCEO (30 V) and PC (500 mW) limits during operation. |
| 2 (Base) | Control input for minority-carrier injection | Receives forward-biased current (IB) to modulate IC; requires series resistor to limit drive and prevent thermal runaway. |
| 3 (Emitter) | Current return path and reference node | Typically grounded or tied to emitter resistor for bias stabilization; defines common reference for VBE and VCE measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Switching & amplification dual use | Validated by VCE(sat) ≤250 mV and hFE ≥110 - enables reuse across digital logic interfaces and analog gain stages without redesign. |
| Low-noise performance | Noise figure 2.0–10.0 dB at 1 kHz - meets requirements for high-fidelity audio preamplifiers and precision sensor signal chains. |
| TO-92 mechanical standardization | JEDEC-compliant footprint - ensures drop-in compatibility with existing PCBs designed for BC546–BC550 family variants. |
| Complementary PNP pairing | Designed as counterpart to BC556–BC560 series - simplifies push-pull and differential pair implementation in discrete op-amp or driver circuits. |
Applications
| Audio Preamp Stage | Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying low-level signals from electret microphones or piezoelectric sensors in consumer audio devices. IC Role / Device Role / Timing Role: NPN small-signal amplifier operating in common-emitter configuration with fixed bias or emitter degeneration. Use Value: hFE = 110–220 and NF = 2.0–10.0 dB ensure adequate gain and minimal added noise at audio frequencies. |
Use Scenario: Buffering and scaling millivolt-level outputs from thermistors, strain gauges, or photodiodes in industrial monitoring systems. IC Role / Device Role / Timing Role: Discrete transistor used in emitter-follower or common-collector configuration for impedance transformation. Use Value: VBE(on) = 580–700 mV and IC(max) = 100 mA support stable DC biasing and low-output-impedance drive into ADC input networks. |
| Digital Logic Level Shifting | Relay/LED Driver Interface |
|
Use Scenario: Translating 3.3 V or 5 V microcontroller GPIO outputs to drive 12 V logic inputs or legacy TTL loads. IC Role / Device Role / Timing Role: Saturated switch in common-emitter mode, controlled by MCU I/O pin via base resistor. Use Value: VCE(sat) ≤250 mV and fast turn-on/turn-off (fT = 300 MHz) minimize power dissipation and propagation delay. |
Use Scenario: Driving electromechanical relays (e.g., 12 V/40 mA coil) or high-current LEDs (up to 80 mA) from embedded controller outputs. IC Role / Device Role / Timing Role: Medium-current switching transistor with base current limiting and collector flyback protection. Use Value: IC = 100 mA rating and PC = 500 mW allow sustained on-state operation without heatsinking in intermittent-duty applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547A | VCEO = 45 V (vs. BC548A_J35Z's 30 V); same hFE Class A (110–220), TO-92 package, identical pinout. | Higher breakdown margin suits 5–12 V rail applications with transient spikes; otherwise functionally interchangeable in low-voltage designs. | Select BC547A when system-level overvoltage risk exceeds 30 V but gain and noise requirements match. |
| 2N3904 | VCEO = 40 V, hFE = 100–300 (typical), Cob ≈ 4.5 pF - broader hFE spread and slightly higher capacitance than BC548A_J35Z. | Widely available and cost-optimized; acceptable where tighter hFE binning or lower noise is not critical. | Choose 2N3904 for cost-sensitive, non-audio applications where ±10% gain variation is tolerable. |
Compared with BC547A and 2N3904, BC548A_J35Z offers the lowest noise figure in its class and tightest hFE binning for predictable biasing, but requires stricter adherence to 30 V VCEO limits - making it optimal for low-noise, low-voltage analog signal paths where consistency matters most.
Availability
BC548A_J35Z is available at Aetrix Electronics and suitable for audio preamplification, sensor signal conditioning, and digital interface buffering requiring stable component supply and long-term obsolescence management.
Supply support for BC548A_J35Z 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.
BC548A_J35Z belongs to the legacy BC5xx family originally developed by Fairchild and now maintained by ON Semiconductor for general-purpose analog and switching applications requiring proven reliability and broad design support.
FAQ
What is the absolute maximum collector-emitter voltage for BC548A_J35Z?
The absolute maximum collector-emitter voltage (VCEO) for BC548A_J35Z is 30 V at TA = 25°C. This rating must not be exceeded under any operating condition, including transients. Derating is required above 25°C ambient per the datasheet's thermal characteristics. BC548A_J35Z must be used within this limit to ensure long-term reliability and avoid junction breakdown.
Is BC548A_J35Z pin-compatible with other BC5xx transistors like BC547 or BC546?
Yes, BC548A_J35Z uses the standard TO-92 package with Collector-Base-Emitter pinout (1-2-3), matching all BC546/BC547/BC548/BC549/BC550 variants. No PCB layout change is needed when substituting within this family, provided voltage and gain requirements align. BC548A_J35Z shares identical mechanical and electrical pin assignments with BC547A and BC546A.
What hFE classification does BC548A_J35Z belong to, and how is it verified?
BC548A_J35Z is classified as Class A, with guaranteed DC current gain (hFE) between 110 and 220 at VCE = 5 V and IC = 2 mA. This binning is confirmed per Fairchild/ON Semiconductor's production test flow and documented in the BC546–BC550 family datasheet Rev. 1.1.1. Each BC548A_J35Z unit is tested and marked accordingly during manufacturing.
Can BC548A_J35Z be used in low-noise audio amplifier designs?
Yes, BC548A_J35Z delivers a noise figure of 2.0–10.0 dB at 1 kHz (VCE = 5 V, IC = 200 μA, RG = 2 kΩ), qualifying it for low-noise preamplifier stages. Its epitaxial silicon structure and Class A hFE stability support repeatable performance in microphone and instrument input circuits - though BC549/BC550 offer lower noise if ultimate SNR is required.
Does BC548A_J35Z have a direct PNP complement in the same family?
Yes, BC548A_J35Z is explicitly designed as the NPN counterpart to BC558 - a PNP transistor sharing identical TO-92 packaging, voltage ratings (VEBO = 5 V, VECO = 30 V), and complementary hFE classification (Class A: 110–220). This pairing enables matched differential pairs, push-pull output stages, and complementary bias networks without footprint or thermal mismatch.
BC548A_J35Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 110 @ 2mA, 5V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC548A_J35Z FAQ
1.How can I place an order for BC548A_J35Z through Aetrix?
Please submit a Request for Quotation (RFQ) for BC548A_J35Z 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 BC548A_J35Z reliable?
The price and inventory of BC548A_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC548A_J35Z is usually 5 days.
3.What payment methods are accepted for BC548A_J35Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC548A_J35Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC548A_J35Z?
BC548A_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC548A_J35Z 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 BC548A_J35Z?
For technical support, including BC548A_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC548A_J35Z requirements.
6.How does Aetrix verify that BC548A_J35Z is sourced from the original manufacturer or authorized distributors?
All BC548A_J35Z 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 BC548A_J35Z meets industry standards.
7.What is the process for return or replacement of BC548A_J35Z?
All BC548A_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC548A_J35Z, 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 BC548A_J35Z part is unused and in its original packaging.
Return procedure for BC548A_J35Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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