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onsemi BC558CZL1G
- Part No.:
- BC558CZL1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC558CZL1G.pdf
- Description:
- TRANS PNP 30V 0.1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,320
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Product details
Overview
BC558CZL1G from onsemi is a PNP silicon small-signal transistor in TO-92 package, rated for VCEO = −30 V, IC = −100 mA continuous, hFE = 420–800 at IC = −2 mA, fT = 360 MHz, and optimized for linear amplification and switching in low-power analog circuits.
For engineers reviewing the BC558CZL1G datasheet, pinout, applications, or equivalent options, this part serves as a high-gain, Pb-free general-purpose PNP transistor suitable for audio preamplifiers, level shifters, current mirrors, and discrete logic interfaces where stable DC gain and low noise are required.
Technical Context
The BC558CZL1G operates as a standard junction bipolar transistor with fixed emitter-base and collector-base junctions, supporting active-mode amplification and saturation-mode switching. Its hFE binning (C-series) guarantees minimum DC current gain of 420 at IC = −2 mA and VCE = −5 V, with typical fT of 360 MHz enabling RF-capable operation up to VHF band.
Thermal design is constrained by RJA = 200°C/W (TO-92, free-air) and RJC = 83.3°C/W, permitting 625 mW dissipation at TA = 25°C - derated linearly above that temperature. The device features VBE(sat) ≤ −0.7 V at IC = −10 mA / IB = −0.5 mA and VCE(sat) ≤ −0.25 V under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 V - Maximum safe collector-emitter voltage before breakdown; defines usable supply headroom in PNP common-emitter stages. |
| hFE (min) | 420 at IC = −2 mA - Ensures predictable bias stability in amplifier designs without requiring gain-tolerance margining. |
| fT | 360 MHz - Supports wideband small-signal amplification up to ~100 MHz with usable gain, verified at IC = −10 mA. |
| NF | 2.0 dB at IC = −0.2 mA - Low-noise performance critical for microphone preamps and sensor signal conditioning. |
| Cob | 3.0–6.0 pF - Junction capacitance limits high-frequency bandwidth and affects Miller effect in common-emitter configurations. |
| PD (TA = 25°C) | 625 mW - Defines maximum continuous power handling in ambient-mounted TO-92 layouts without heatsinking. |
| RJA | 200°C/W - Thermal resistance determines allowable power vs. ambient temperature rise; requires layout derating above 25°C. |
Pinout & Package
BC558CZL1G uses the industry-standard TO-92 (Case 29, Style 17) plastic package with 3 leads, lead-free finish, and marking "BC558C" followed by date code. Mounting orientation follows JEDEC TO-92 conventions with flat side facing viewer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Collector | Anode-side terminal for current sourcing; connects to most positive node in PNP configuration (e.g., VCC via load resistor). |
| 2 | Base | Control electrode; negative input bias required to turn on; sensitive to ESD and leakage due to high hFE. |
| 3 | Emitter | Cathode-side terminal; typically tied to ground or lower-potential rail; carries full load current in common-emitter topology. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free TO-92 package | Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow profiles (J-STD-020) without SnPb solder compatibility concerns. |
| C-series hFE binning | Guaranteed hFE ≥ 420 at IC = −2 mA ensures consistent DC operating point across production lots in bias-critical amplifiers. |
| Low noise figure | NF = 2.0 dB enables use in front-end analog stages where signal integrity dominates over power efficiency. |
| High fT / low Cob ratio | 360 MHz fT with 3–6 pF Cob yields favorable gain-bandwidth tradeoff for discrete RF matching networks. |
| −55°C to +150°C TJ | Extended junction temperature range supports operation in industrial enclosures and automotive under-hood auxiliary circuits. |
Applications
| Audio Preamp Stage | Level Shifter Interface |
|---|---|
Use Scenario: Amplifying low-level microphone or piezoelectric sensor signals in battery-powered portable recorders. IC Role / Device Role / Timing Role: PNP common-emitter small-signal amplifier providing 20–40 dB voltage gain with minimal added noise. Use Value: 2.0 dB noise figure and hFE ≥ 420 ensure clean signal capture without requiring multi-stage gain compensation. |
Use Scenario: Translating 3.3 V logic outputs to −5 V or −12 V rails in mixed-voltage industrial PLC I/O modules. IC Role / Device Role / Timing Role: Saturated PNP switch sinking current from higher-negative supply into microcontroller GPIO. Use Value: VCE(sat) ≤ −0.25 V at IC/IB = 10 ensures <100 mV voltage drop during active-low assertion, preserving logic margins. |
| Current Mirror Reference | Discrete Logic Inverter |
Use Scenario: Building matched current sources in analog sensor front-ends or op-amp bias networks where thermal tracking matters. IC Role / Device Role / Timing Role: One leg of a two-transistor current mirror with emitter degeneration resistors for improved accuracy. Use Value: Tight hFE binning (C-series) and low VBE temperature coefficient (−2.2 mV/°C) reduce mismatch-induced error below 2% over 0–70°C. |
Use Scenario: Implementing non-inverting or inverting logic gates in legacy TTL-compatible systems where IC replacement isn't feasible. IC Role / Device Role / Timing Role: PNP-based saturated switch driving LED indicators or relay coils from 5 V or 12 V supplies. Use Value: Fast turn-off (limited by minority-carrier lifetime) and guaranteed hFE support reliable switching at ≤100 kHz without base drive overdesign. |
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 |
|---|---|---|---|
| BC558BZL1G | Lower hFE bin: 220–460 (vs. 420–800); identical VCEO, fT, and package. | Suitable where gain tolerance >20% is acceptable; less stable bias in high-precision amplifiers. | Select BC558BZL1G only when cost sensitivity outweighs gain consistency requirements. |
| MMBT558LT1G | SOT-23 surface-mount package; same electrical specs but 300 mW PD rating and RJA = 300°C/W. | Preferred for space-constrained PCBs; requires thermal pad or copper pour to match TO-92 power handling. | Choose MMBT558LT1G for automated assembly and density-critical designs; verify thermal layout per JEDEC JESD51-2. |
Compared with BC558BZL1G and MMBT558LT1G, BC558CZL1G delivers highest guaranteed hFE in through-hole format, making it optimal for analog circuits demanding predictable DC operating points without trimming or feedback compensation.
Availability
BC558CZL1G is available at Aetrix Electronics and suitable for audio preamplifiers, industrial level shifters, and discrete current mirrors requiring stable component supply, long-term obsolescence management, and RoHS-compliant through-hole assembly.
Supply support for BC558CZL1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC558 series belongs to onsemi's legacy general-purpose bipolar transistor product line, designed specifically for cost-sensitive, high-reliability linear and switching applications in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum collector-emitter voltage rating for BC558CZL1G?
The BC558CZL1G has a maximum collector-emitter voltage (VCEO) rating of −30 VDC. This value is absolute maximum and must not be exceeded under any operating condition, including transient spikes. Operation near this limit requires careful consideration of secondary breakdown curves shown in Figure 14 of the official datasheet, especially at elevated temperatures or pulsed loads.
Does BC558CZL1G have a guaranteed minimum DC current gain?
Yes, BC558CZL1G is binned to the "C" gain group, guaranteeing hFE ≥ 420 when tested at IC = −2.0 mA and VCE = −5.0 V. This minimum is specified across the full operating temperature range (−55°C to +150°C), ensuring predictable bias stability in production designs without gain-dependent recalibration.
Is BC558CZL1G RoHS compliant and lead-free?
Yes, BC558CZL1G is explicitly marked as Pb-free in the ordering information table (page 6 of the datasheet) and conforms to RoHS Directive 2011/65/EU. Its TO-92 package uses lead-free terminations and complies with J-STD-020 moisture sensitivity level (MSL) requirements for standard reflow processes.
What is the typical transition frequency (fT) of BC558CZL1G?
The typical transition frequency (fT) of BC558CZL1G is 360 MHz, measured at IC = −10 mA, VCE = −5.0 V, and f = 100 MHz. This parameter reflects the frequency at which short-circuit current gain drops to unity and confirms suitability for VHF-range amplification and narrowband oscillator designs.
Can BC558CZL1G replace BC558BZL1G in an existing design?
BC558CZL1G can directly replace BC558BZL1G in most cases because both share identical package, pinout, voltage/current ratings, and thermal characteristics. However, the higher guaranteed hFE (420–800 vs. 220–460) may shift DC bias points - verify quiescent collector current and VCE in linear applications before substitution.
BC558CZL1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 360MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
BC558CZL1G FAQ
1.How can I place an order for BC558CZL1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC558CZL1G 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 BC558CZL1G reliable?
The price and inventory of BC558CZL1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC558CZL1G is usually 5 days.
3.What payment methods are accepted for BC558CZL1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC558CZL1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC558CZL1G?
BC558CZL1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC558CZL1G 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 BC558CZL1G?
For technical support, including BC558CZL1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC558CZL1G requirements.
6.How does Aetrix verify that BC558CZL1G is sourced from the original manufacturer or authorized distributors?
All BC558CZL1G 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 BC558CZL1G meets industry standards.
7.What is the process for return or replacement of BC558CZL1G?
All BC558CZL1G units undergo pre-shipment inspection (PSI). If there is an issue with BC558CZL1G, 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 BC558CZL1G part is unused and in its original packaging.
Return procedure for BC558CZL1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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