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onsemi BC327ZL1
- Part No.:
- BC327ZL1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC327ZL1.pdf
- Description:
- TRANS PNP 45V 0.8A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:6,653
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Product details
Overview
BC327ZL1 from onsemi is a PNP silicon bipolar junction transistor designed for general-purpose amplification and switching in low-voltage, medium-current circuits. It features −45 V VCEO, −800 mA IC, 625 mW power dissipation at TA = 25°C, hFE of 100–630 (depending on bias), and TO-92 package. It is commonly used in discrete logic inverters, relay drivers, and LED current control stages.
For engineers reviewing the BC327ZL1 datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, DC current gain range across operating conditions, thermal resistance (RJA = 200°C/W), saturation voltage at IC/IB = 10, and compatibility with through-hole PCB assembly using standard TO-92 footprints.
Technical Context
The BC327ZL1 operates as a medium-power PNP BJT with fixed-emitter configuration and base-controlled conduction. Its safe operating area (SOA) is defined by thermal limits up to 135°C junction temperature, second-breakdown constraints, and current/voltage boundaries - notably −45 V VCEO and −800 mA IC continuous rating.
It exhibits fT = 260 MHz at IC = −10 mA and VCE = −5 V, supporting audio-frequency amplification and low-speed digital switching. Cob = 11 pF and VBE(on) ≈ −1.2 V at IC = −300 mA confirm its suitability for stable biasing in Class-A amplifiers and saturated-switch applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum collector-emitter voltage before breakdown; sets upper rail limit in PNP switch or amplifier stages. |
| IC (continuous) | −800 mA - Continuous collector current capability; supports relay coils, small solenoids, and LED arrays without heatsinking below 25°C ambient. |
| PD @ 25°C | 625 mW - Power dissipation limit at room temperature; derates linearly at 5.0 mW/°C above 25°C ambient. |
| hFE | 100–630 - DC current gain range across IC = −100 mA to −500 mA; enables predictable base drive sizing for saturation or linear operation. |
| VCE(sat) | −0.7 V @ IC = −500 mA, IB = −50 mA - Low saturation voltage minimizes power loss and heat generation in switching applications. |
| fT | 260 MHz - Transition frequency confirms usable bandwidth up to ~10–20 MHz in small-signal amplifiers with proper biasing. |
| RJA | 200°C/W - Junction-to-ambient thermal resistance; determines required board copper area or airflow for thermal management. |
Pinout & Package
BC327ZL1 uses the industry-standard TO-92 package (Case 29, Style 17), with 3 leads in straight-line configuration and lead spacing of 2.54 mm. The package is compatible with manual soldering and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Collector | Primary current sink node; connects to load (e.g., relay coil anode or VCC-side resistor); reverse-biased during cutoff. |
| 2 | Base | Control terminal; sinking current turns device ON; requires current-limiting resistor to prevent overdrive and thermal runaway. |
| 3 | Emitter | Common reference node; typically tied to VCC in high-side switch configurations or grounded in common-emitter amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free packaging option | BC327ZL1G variant available per J-STD-609; supports RoHS-compliant manufacturing without lead reflow concerns. |
| High hFE consistency | Guaranteed hFE ≥ 100 at IC = −100 mA ensures reliable switching margin and reduces base drive circuit complexity. |
| Low VCE(sat) | ≤ −0.7 V under heavy load enables >90% efficiency in saturated PNP switches driving 12 V loads at 500 mA. |
| TO-92 tape-and-ammo delivery | ZL1 suffix indicates 2000-unit ammo box packaging - optimized for automated pick-and-place insertion in high-mix SMT hybrid assemblies. |
Applications
| Relay Driver Circuit | LED Current Sink Stage |
|---|---|
|
Use Scenario: Driving 12 V, 400 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: PNP BJT configured as high-side switch with base resistor and flyback diode. Use Value: −0.7 V VCE(sat) minimizes coil voltage drop; hFE ≥ 100 allows <5 mA base drive, reducing MCU output loading. |
Use Scenario: Controlling brightness of multi-segment LED display via constant-current sink topology. IC Role / Device Role / Timing Role: Linear current regulator in common-emitter configuration with emitter resistor feedback. Use Value: Stable hFE and low VBE(on) variation enable ±5% current accuracy across temperature without active compensation. |
| Discrete Inverter Logic | Audio Preamp Stage |
|
Use Scenario: Building non-inverting buffer or level-shifting stage in legacy TTL-to-CMOS interface circuits. IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed bias and collector pull-up resistor. Use Value: fT = 260 MHz supports clean square-wave response up to 10 MHz; low Cob = 11 pF prevents signal coupling distortion. |
Use Scenario: Single-stage low-noise preamplifier for electret microphone output in battery-powered voice recorders. IC Role / Device Role / Timing Role: Class-A common-emitter amplifier with emitter degeneration and bypassed emitter resistor. Use Value: High hFE and low noise figure (<5 dB typical) ensure adequate voltage gain (>100×) with minimal supply current (<1 mA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC327-25ZL1 | Higher guaranteed hFE (min 160 @ IC = −100 mA) and same TO-92 ZL1 packaging. | Better suited for low-base-drive designs where precise current gain is critical, e.g., precision current mirrors. | Select BC327-25ZL1 when hFE stability >160 is required; otherwise BC327ZL1 offers cost-effective baseline performance. |
| BC327-40ZL1 | Maximum hFE extended to 630 (vs. 630 max for BC327ZL1), but identical VCEO, IC, and package. | Preferred in high-gain analog stages where wide hFE tolerance must be avoided, such as active filters or differential pairs. | Choose BC327-40ZL1 only if design requires guaranteed hFE ≥ 250 at IC = −300 mA; BC327ZL1 remains optimal for general-purpose use. |
Compared with BC327-25ZL1 and BC327-40ZL1, the BC327ZL1 provides the broadest hFE range (100–630) while maintaining identical thermal, voltage, and packaging specs - making it ideal for cost-sensitive, volume production where gain binning is handled at system level rather than component level.
Availability
BC327ZL1 is available at Aetrix Electronics and suitable for relay driver circuits, LED current sink stages, discrete inverter logic, and audio preamp stages requiring stable component supply, consistent TO-92 mechanical fit, and Pb-free compliance options.
Supply support for BC327ZL1 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The BC327ZL1 belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability in discrete amplifier and switching applications where robustness, thermal stability, and manufacturability are prioritized over ultra-high-speed or RF performance.
FAQ
What is the maximum collector-emitter voltage rating for BC327ZL1?
The BC327ZL1 has a maximum collector-emitter voltage rating (VCEO) of −45 VDC. This rating defines the highest reverse voltage that can be applied between collector and emitter while the base is open, before breakdown occurs. Exceeding this value risks permanent damage. The BC327ZL1 must not be used in circuits where transient spikes or operating voltages exceed −45 V without clamping or derating.
Does BC327ZL1 have a Pb-free version?
Yes, the BC327ZL1G is the Pb-free variant of BC327ZL1, fully compliant with RoHS Directive 2011/65/EU. Both share identical electrical specifications and TO-92 packaging dimensions, differing only in termination plating. The BC327ZL1G uses matte tin lead finish and meets J-STD-609 Category 1 requirements for lead-free soldering processes.
What is the thermal resistance junction-to-ambient for BC327ZL1?
The BC327ZL1 has a thermal resistance junction-to-ambient (RJA) of 200°C/W under standard test conditions (free-air, no heatsink). This means each watt of power dissipated raises the junction temperature by 200°C above ambient. For reliable operation at full 625 mW, ambient temperature must remain below 25°C unless additional copper area or airflow is provided.
How does BC327ZL1 differ from BC327-16ZL1 in terms of DC current gain?
The BC327ZL1 specifies hFE ranging from 100 to 630 depending on operating point, whereas BC327-16ZL1 guarantees minimum hFE = 160 at IC = −100 mA and VCE = −1 V. The "16" suffix denotes a tighter hFE bin; BC327ZL1 is the base-grade version with broader gain distribution, suitable for applications tolerant of hFE variance.
Can BC327ZL1 be used in audio amplifier circuits?
Yes, the BC327ZL1 is suitable for low-power audio amplifier stages, including microphone preamps and line drivers. Its fT = 260 MHz, low Cob = 11 pF, and stable hFE support clean gain up to 20 kHz. However, it is not optimized for ultra-low-noise or high-fidelity applications; for those, dedicated low-noise transistors like BC550C or 2N5088 are preferred. The BC327ZL1 excels in cost-sensitive, general-purpose audio signal conditioning.
BC327ZL1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 800 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 260MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
BC327ZL1 FAQ
1.How can I place an order for BC327ZL1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC327ZL1 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 BC327ZL1 reliable?
The price and inventory of BC327ZL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC327ZL1 is usually 5 days.
3.What payment methods are accepted for BC327ZL1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC327ZL1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC327ZL1?
BC327ZL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC327ZL1 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 BC327ZL1?
For technical support, including BC327ZL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC327ZL1 requirements.
6.How does Aetrix verify that BC327ZL1 is sourced from the original manufacturer or authorized distributors?
All BC327ZL1 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 BC327ZL1 meets industry standards.
7.What is the process for return or replacement of BC327ZL1?
All BC327ZL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC327ZL1, 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 BC327ZL1 part is unused and in its original packaging.
Return procedure for BC327ZL1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC327ZL1 Tags
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