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NXP Semiconductors BC327,412
- Part No.:
- BC327,412
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC327,412.pdf
- Description:
- TRANS PNP 45V 0.5A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,208
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Product details
Overview
BC327,412 from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in TO-92 (SOT54) through-hole package, rated for −45 V VCEO, −500 mA IC, and 625 mW power dissipation at Tamb ≤ 25 °C. It delivers DC current gain (hFE) of 100–600 depending on selection variant, with VCE(sat) ≤ −700 mV at IC = −500 mA / IB = −50 mA, and is widely used in low-voltage switching and linear amplification circuits in industrial control modules.
For engineers reviewing the BC327,412 datasheet, BC327,412 pinout, BC327,412 application, or BC327,412 equivalent, this page provides verified electrical parameters, confirmed SOT54 pin configuration, thermal resistance (Rth(j-a) = 200 K/W), junction temperature limit (150 °C), and validated alternative parts for discrete BJT replacement scenarios.
Technical Context
The BC327,412 operates as a silicon PNP BJT with fixed emitter-base-collector terminal arrangement in SOT54. Its design supports DC switching and analog amplification with guaranteed hFE range across variants (−16/−25/−40), and exhibits VBE ≈ −1.2 V at IC = −500 mA, enabling predictable base drive requirements in saturated switch configurations.
Thermal performance is defined for FR4 PCB mounting with single-sided copper and standard footprint, delivering Rth(j-a) = 200 K/W - significantly lower than surface-mount variants (e.g., BC807: 500 K/W). This enables higher continuous current capability in through-hole designs without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe operating voltage headroom in low-voltage PNP switch applications. |
| IC (DC) | −500 mA - Continuous collector current rating; sets maximum load-handling capacity in relay drivers or LED current sinks. |
| Ptot | 625 mW at Tamb ≤ 25 °C - Total power dissipation limit; determines thermal derating curve for ambient temperatures above 25 °C. |
| hFE | 100–600 - DC current gain range (variant-dependent); directly impacts required base drive current for target collector current. |
| VCE(sat) | ≤ −700 mV at IC = −500 mA / IB = −50 mA - Saturation voltage defining conduction loss and heat generation in switching mode. |
| Rth(j-a) | 200 K/W - Junction-to-ambient thermal resistance; enables calculation of junction temperature rise (ΔTj = Ptot × Rth(j-a)) for reliability analysis. |
| fT | 80 MHz - Transition frequency; indicates usable bandwidth for small-signal amplification up to ~10–20 MHz with gain margin. |
Pinout & Package
SOT54 (TO-92) plastic single-ended leaded through-hole package with 3 leads; standardized JEITA SC-43A outline; body length 14.5 mm, lead pitch 2.54 mm, lead diameter 0.48 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current source terminal in PNP operation; connected to higher potential (e.g., VCC) in common-emitter switch configurations. |
| 2 | Base | Control input; negative bias relative to emitter turns device ON; requires current-limited drive to avoid exceeding IBM = −200 mA peak. |
| 3 | Collector | Current sink terminal; connected to load and ground reference; voltage swing limited by VCEO = −45 V. |
Key Features
| Feature | Design Value |
|---|---|
| High-current capability | −500 mA DC collector current supports driving relays, solenoids, and medium-power LEDs without external buffering. |
| Low saturation voltage | VCE(sat) ≤ −700 mV at full rated current minimizes conduction loss and self-heating in switching applications. |
| Wide hFE range | 100–600 gain spread across BC327-16/-25/-40 variants allows precise base resistor selection for consistent switching thresholds. |
| Robust thermal performance | Rth(j-a) = 200 K/W enables stable operation at elevated ambient temperatures when mounted on standard FR4 PCBs. |
| Through-hole reliability | SOT54 (TO-92) mechanical stability and solder joint strength suit industrial environments with vibration or thermal cycling. |
Applications
| Industrial Relay Driver | Linear Voltage Regulator Pass Element |
|---|---|
|
Use Scenario: Driving 12 V/200 mA electromagnetic relay coil in programmable logic controller (PLC) output stage. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter topology, sinking relay coil current to ground when base is pulled low. Use Value: VCE(sat) ≤ −700 mV ensures <150 mW dissipation at full load, eliminating need for heatsinking in compact enclosures. |
Use Scenario: Series pass transistor in adjustable 5–12 V linear regulator supplying microcontroller peripherals. IC Role / Device Role / Timing Role: PNP emitter-follower configured as current amplifier, regulating output via feedback-controlled base voltage. Use Value: hFE ≥ 100 reduces base drive current burden on error amplifier, improving regulation accuracy and transient response. |
| LED Current Sink | Audio Pre-amplifier Stage |
|
Use Scenario: Constant-current sink for high-brightness white LED string in signage backlighting. IC Role / Device Role / Timing Role: Common-emitter amplifier biased in linear region, with emitter resistor setting LED current. Use Value: Tight VBE tolerance (−1.2 V typ.) and stable hFE enable ±5% current regulation across temperature and unit variance. |
Use Scenario: Low-noise pre-amplifier stage for electret microphone signal conditioning in voice-enabled IoT devices. IC Role / Device Role / Timing Role: Common-collector (emitter-follower) buffer providing impedance transformation and signal isolation. Use Value: fT = 80 MHz supports flat frequency response up to 20 kHz with minimal phase shift, preserving audio fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP BJT switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC327-40,412 | Higher hFE (250–600) vs. BC327,412's unspecified gain bin; identical VCEO, IC, package, and pinout. | Better suited for low-base-drive applications (e.g., microcontroller GPIO direct drive) where gain consistency is critical. | Select BC327-40,412 when designing for minimum base current or tighter hFE distribution; verify layout compatibility with same SOT54 footprint. |
| PN2907A,412 | Same SOT54 package and PNP polarity, but lower VCEO (−60 V), higher IC (−600 mA), and wider hFE range (100–300). | Preferred in higher-voltage industrial controls (e.g., 24 V bus switching) where extra voltage margin improves safety margin. | Choose PN2907A,412 for designs requiring >−45 V blocking or >−500 mA current; confirm thermal design accommodates its 625 mW rating. |
Compared with BC327,412, BC327-40,412 offers higher and more tightly binned current gain for reduced base drive sensitivity, while PN2907A,412 provides greater voltage headroom and current capacity - both retain identical SOT54 mounting and pin compatibility for drop-in evaluation.
Availability
BC327,412 is available at Aetrix Electronics and suitable for industrial relay drivers, linear regulator pass elements, LED current sinks, and audio pre-amplifier stages requiring stable component supply and long-term obsolescence management.
Supply support for BC327,412 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
Nexperia is a global leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and consumer markets.
The BC327,412 belongs to Nexperia's legacy general-purpose BJT product line, engineered for cost-effective, robust switching and amplification in through-hole designs where thermal stability and mechanical ruggedness are prioritized over miniaturization.
FAQ
What is the pin configuration of BC327,412?
The BC327,412 uses SOT54 (TO-92) package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector - confirmed per Nexperia's official pinning table. This emitter-base-collector order differs from many NPN TO-92 parts and must be verified during PCB layout to prevent reverse installation.
Does BC327,412 have a specified hFE bin?
No - BC327,412 is the generic part number without suffix; its hFE falls within the full family range of 100–600. For guaranteed gain, select BC327-16,412 (hFE = 100–250), BC327-25,412 (160–400), or BC327-40,412 (250–600), all in identical SOT54 packaging.
What is the maximum power dissipation of BC327,412 at 70 °C ambient?
At Tamb = 70 °C, BC327,412's power dissipation must be derated linearly from 625 mW at 25 °C using its thermal resistance Rth(j-a) = 200 K/W and Tj(max) = 150 °C. The result is Ptot = (150 − 70) / 200 = 400 mW maximum continuous dissipation.
Can BC327,412 replace BC327-25,412 in a circuit?
Yes - BC327,412 is functionally compatible with BC327-25,412 and other variants, sharing identical absolute maximum ratings, package, pinout, and electrical characteristics except hFE distribution. Circuit functionality remains intact, though base resistor values may require adjustment if gain sensitivity is critical.
Is BC327,412 RoHS compliant and halogen-free?
Yes - BC327,412 meets RoHS Directive 2011/65/EU and is halogen-free per Nexperia's material declarations. The device carries the "HF" marking on datasheets and conforms to JEDEC J-STD-609 for halogen content, supporting environmentally regulated industrial and consumer applications.
BC327,412 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 80MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC327,412 FAQ
1.How can I place an order for BC327,412 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC327,412 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 BC327,412 reliable?
The price and inventory of BC327,412 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC327,412 is usually 5 days.
3.What payment methods are accepted for BC327,412?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC327,412 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC327,412?
BC327,412 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC327,412 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 BC327,412?
For technical support, including BC327,412 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC327,412 requirements.
6.How does Aetrix verify that BC327,412 is sourced from the original manufacturer or authorized distributors?
All BC327,412 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 BC327,412 meets industry standards.
7.What is the process for return or replacement of BC327,412?
All BC327,412 units undergo pre-shipment inspection (PSI). If there is an issue with BC327,412, 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 BC327,412 part is unused and in its original packaging.
Return procedure for BC327,412:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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