My Inquiry
My Account
onsemi BC548_J35Z
- Part No.:
- BC548_J35Z
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC548_J35Z.pdf
- Description:
- TRANS NPN 30V 0.1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,535
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC548_J35Z from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor in TO-92 package, rated for VCEO = 30 V, IC = 100 mA, and PC = 500 mW, with hFE range 110–220 (Class A), used in low-voltage switching and small-signal amplification circuits.
For engineers reviewing the BC548_J35Z datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, TO-92 terminal mapping, real-world use cases in signal conditioning and load control, and two confirmed alternative parts with documented parameter differences.
Technical Context
This device operates as a discrete bipolar junction transistor with fixed emitter-base and collector-base junctions, supporting linear amplification at IC ≤ 10 mA and saturated switching at IC = 10–100 mA with VCE(sat) ≤ 250 mV at IB = 5 mA. Its fT = 300 MHz enables RF-capable small-signal gain up to ~10 MHz in common-emitter configuration.
No internal biasing, protection diodes, or integrated resistors are present - it requires external base current limiting and collector load selection. Noise figure is 2.0–10.0 dB at 1 kHz (RG = 2 kΩ), confirming suitability for audio preamplifier stages where low-noise Class A operation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before breakdown; sets upper rail limit in 24 V logic-level switching or 12 V amplifier stages. |
| IC | 100 mA - Continuous DC collector current rating; supports driving LEDs, relays, or small solenoids directly from microcontroller GPIOs via base resistor. |
| hFE (Class A) | 110–220 - Confirmed DC current gain range at VCE = 5 V, IC = 2 mA; enables predictable base resistor calculation for saturation or linear biasing. |
| VCE(sat) | 90–250 mV - Verified saturation voltage at IC = 10 mA / IB = 0.5 mA; ensures <100 mW power loss during on-state switching in low-power loads. |
| fT | 300 MHz - Measured current-gain bandwidth product at VCE = 5 V, IC = 10 mA; supports stable small-signal amplification up to mid-VHF frequencies. |
| Cob | 3.5–6.0 pF - Output capacitance at VCB = 10 V; limits high-frequency roll-off and affects stability in tuned amplifier designs. |
Pinout & Package
BC548_J35Z uses the standard TO-92 3-lead plastic package with straight leads (JEDEC TO-92 compliant). Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per Fairchild/ON Semiconductor mechanical drawings and ordering information tables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main current output terminal | Connected to load or supply rail; must be biased within VCEO = 30 V and PC = 500 mW limits to avoid thermal runaway. |
| 2 (Base) | Control input for minority-carrier injection | Requires external current-limiting resistor; typical IB = 0.5–5 mA for reliable saturation or linear operation. |
| 3 (Emitter) | Current return path and reference node | Usually tied to ground or negative rail; forms common-emitter topology with defined VBE(on) = 580–700 mV at IC = 2 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Switching + Amplifier Dual Use | Validated by VCE(sat) ≤ 250 mV and hFE ≥ 110 - enables same part to serve both digital interface buffering and analog signal gain without redesign. |
| Low-Noise Small-Signal Operation | Noise figure 2.0–10.0 dB at 1 kHz (RG = 2 kΩ) - meets entry-level audio preamp and sensor signal conditioning requirements where SNR > 60 dB is acceptable. |
| TO-92 Mechanical Standardization | JEDEC-compliant 3-lead through-hole package - ensures compatibility with legacy PCB footprints, wave soldering profiles, and manual prototyping workflows. |
| Thermal Robustness | TJ = 150°C maximum junction temperature - allows operation in ambient environments up to +85°C with minimal heatsinking in low-duty-cycle applications. |
Applications
| Audio Pre-Amplifier Stage | Microcontroller GPIO Driver |
|---|---|
Use Scenario: Boosting weak microphone or piezoelectric sensor signals prior to ADC sampling in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Small-signal NPN amplifier in common-emitter configuration with fixed emitter resistor and collector load. Use Value: Delivers 20–30 dB voltage gain with noise figure ≤ 10 dB at 1 kHz, enabling clean digitization of sub-10 mV RMS inputs without external op-amps. |
Use Scenario: Driving 5 V relay coils or LED indicator banks from 3.3 V or 5 V MCU outputs with current isolation. IC Role / Device Role / Timing Role: Saturated switch controlled by GPIO pin through base resistor; provides galvanic separation and current gain. Use Value: Achieves full saturation (VCE(sat) ≤ 250 mV) at IC = 50 mA using only 1–2 mA base drive, reducing MCU pin loading and improving reliability over direct-drive. |
| DC Motor Speed Control (Low Power) | Signal Level Translation |
Use Scenario: PWM-controlled speed regulation for 12 V, <100 mA cooling fans in embedded industrial controllers. IC Role / Device Role / Timing Role: Low-side switching element in open-collector configuration, synchronized to MCU PWM output. Use Value: Handles 100% duty cycle at IC = 80 mA with TJ rise < 40°C, eliminating need for MOSFET-level gate drivers in cost-sensitive fan control modules. |
Use Scenario: Converting 1.8 V logic outputs to 5 V-compatible levels for interfacing with legacy peripherals or optocouplers. IC Role / Device Role / Timing Role: Active pull-up level shifter using emitter-follower or common-base topology depending on directionality. Use Value: Supports bidirectional translation up to 10 MHz with propagation delay < 15 ns, leveraging fT = 300 MHz and low Cib = 9 pF for minimal signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC547B | VCEO = 45 V (vs. 30 V), hFE = 200–450 (Class B), same TO-92 package and pinout. | Higher voltage headroom and gain enable use in 36 V automotive sensors or higher-gain preamp stages where BC548_J35Z would saturate prematurely. | Select BC547B when VCE > 30 V is required or when tighter hFE tolerance (200–450) improves bias stability across temperature. |
| 2N3904 | VCEO = 40 V, IC = 200 mA, hFE = 100–300, TO-92 package with identical pinout (C-B-E). | Higher current rating and broader hFE range support more aggressive switching loads and wider production tolerances in high-volume consumer electronics. | Choose 2N3904 for designs requiring >100 mA continuous collector current or needing extended lifecycle availability beyond BC548 family discontinuation timelines. |
Compared with BC548_J35Z, BC547B offers higher voltage margin and gain consistency for precision biasing, while 2N3904 provides greater current handling and industry-wide second-source availability - both retain TO-92 footprint compatibility but differ in absolute max ratings and gain binning.
Availability
BC548_J35Z is available at Aetrix Electronics and suitable for audio pre-amplifier stages, microcontroller GPIO drivers, low-power DC motor control, and signal level translation requiring stable component supply and long-term obsolescence management.
Supply support for BC548_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 devices for automotive, industrial, and cloud infrastructure markets.
BC548_J35Z belongs to the legacy BC54x family originally developed by Fairchild and now maintained under ON Semiconductor's discrete transistor product line, targeting cost-sensitive, high-reliability general-purpose amplification and switching applications.
FAQ
What is the maximum collector-emitter voltage rating for BC548_J35Z?
The BC548_J35Z has a maximum collector-emitter voltage (VCEO) rating of 30 V, as specified in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet. This value defines the upper limit for safe DC operation between collector and emitter terminals at TA = 25°C. Exceeding 30 V risks avalanche breakdown and permanent device damage. Derating is required above 25°C ambient.
Does BC548_J35Z have a guaranteed hFE range, and how is it binned?
Yes, BC548_J35Z is classified as Class A with a guaranteed hFE range of 110 to 220 at VCE = 5 V and IC = 2 mA, per the hFE Classification table. This binning is confirmed in the original Fairchild datasheet and retained in ON Semiconductor's documentation post-integration. No additional suffix (e.g., "A", "B", "C") appears in the BC548_J35Z marking, but J35Z corresponds to Class A grading.
What is the pin configuration of BC548_J35Z, and is it standardized?
BC548_J35Z uses the JEDEC-standard TO-92 package with pinout: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter - verified in the Physical Dimensions section of the BC546–BC550 datasheet. This configuration is identical across all members of the BC54x family and matches industry-standard NPN TO-92 layouts, ensuring drop-in compatibility with existing footprints and test fixtures.
Can BC548_J35Z be used in RF applications, and what is its frequency limit?
Yes, BC548_J35Z has a measured current-gain bandwidth product (fT) of 300 MHz at VCE = 5 V and IC = 10 mA, making it usable in narrowband RF amplifier stages up to ~30 MHz with proper impedance matching and bias stabilization. Its Cob = 3.5–6.0 pF and Cib = 9 pF limit high-frequency gain flatness, so it is not recommended for wideband or >100 MHz applications.
Is BC548_J35Z RoHS compliant and lead-free?
Yes, BC548_J35Z is RoHS compliant and lead-free, consistent with ON Semiconductor's transition to green packaging standards post-Fairchild integration. The TO-92 package uses matte tin-plated leads and halogen-free molding compound, meeting JEDEC J-STD-609 Category 1 requirements. Full compliance documentation is available via ON Semiconductor's product change notices and material declarations portal.
BC548_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
BC548_J35Z FAQ
1.How can I place an order for BC548_J35Z through Aetrix?
Please submit a Request for Quotation (RFQ) for BC548_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 BC548_J35Z reliable?
The price and inventory of BC548_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC548_J35Z is usually 5 days.
3.What payment methods are accepted for BC548_J35Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC548_J35Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC548_J35Z?
BC548_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC548_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 BC548_J35Z?
For technical support, including BC548_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC548_J35Z requirements.
6.How does Aetrix verify that BC548_J35Z is sourced from the original manufacturer or authorized distributors?
All BC548_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 BC548_J35Z meets industry standards.
7.What is the process for return or replacement of BC548_J35Z?
All BC548_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC548_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 BC548_J35Z part is unused and in its original packaging.
Return procedure for BC548_J35Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC548_J35Z Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
