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NXP Semiconductors BC327,126
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- Part No.:
- BC327,126
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC327,126.pdf
- Description:
- TRANS PNP 45V 0.5A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,314
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Product details
Overview
BC327,126 from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT54A (TO-92 wide-pitch) through-hole package, rated for −45 V VCEO, −500 mA IC, and 625 mW Ptot. It delivers DC current gain (hFE) of 100–250 at −100 mA/−1 V, with VCE(sat) ≤ −700 mV at −500 mA/−50 mA drive-used in low-voltage switching and linear amplification stages of industrial control interfaces and power supply feedback circuits.
For engineers reviewing the BC327,126 datasheet, BC327,126 pinout, BC327,126 application, or BC327,126 equivalent, this page provides verified pin configuration, thermal resistance (Rth(j-a) = 200 K/W), saturation voltage behavior across temperature, complementary NPN pairing (BC337), and validated alternatives for through-hole BJT replacement in legacy PCB designs.
Technical Context
The BC327,126 operates as a medium-power PNP BJT with fixed emitter-base-collector terminal assignment and no integrated biasing or protection circuitry. Its hFE range (100–250) corresponds to the "-16" selection group, confirmed by marking code C32716 and consistent with IC = −100 mA / VCE = −1 V test conditions.
Thermal performance is defined for FR4 PCB mounting with single-sided copper: junction-to-ambient thermal resistance is 200 K/W, enabling stable operation up to Tj = 150 °C. Electrical limits include −50 V VCBO, −5 V VEBO, and −1 A ICM, supporting robust switching in 24 V industrial logic and relay driver applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum collector-emitter blocking voltage with base open; defines safe operating range in common-emitter switch configurations. |
| IC (DC) | −500 mA - Continuous collector current rating; supports load switching up to ~120 mW dissipation at room ambient. |
| hFE | 100–250 - DC current gain at −100 mA / −1 V; enables predictable base drive design for gain-controlled amplification or saturated switching. |
| VCE(sat) | ≤ −700 mV at −500 mA / −50 mA - Low saturation voltage ensures minimal conduction loss in high-current on-state operation. |
| Ptot | 625 mW at Tamb ≤ 25 °C - Total power dissipation limit; requires thermal derating above 25 °C per Rth(j-a) = 200 K/W. |
| Rth(j-a) | 200 K/W - Junction-to-ambient thermal resistance on standard FR4; determines temperature rise under steady-state bias. |
| Package | SOT54A (SC-43A, TO-92 wide pitch) - Through-hole 3-lead plastic package with 5.08 mm lead pitch; compatible with wave soldering and manual prototyping. |
Pinout & Package
SOT54A is a plastic single-ended leaded (through-hole) package with 3 leads, 5.08 mm lead pitch (e = 5.08 mm), and standardized TO-92 mechanical outline optimized for wide-pitch PCB layouts. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - verified per Table 3 and Figure 16 of the official datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit node in PNP operation; connects to higher potential rail (e.g., +VCC) in common-emitter switches. |
| 2 | Base | Control terminal; negative current injection turns device on; requires current-limiting resistor for safe biasing. |
| 3 | Collector | Current entry node; ties to load and ground in typical switching topologies; handles full load current path. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current capability | −500 mA continuous collector current supports driving relays, LEDs, and small solenoids directly. |
| Low saturation voltage | VCE(sat) ≤ −700 mV at −500 mA ensures <150 mW conduction loss, improving efficiency in linear and switching modes. |
| Wide operating temperature | −65 °C to +150 °C storage and junction temperature range enables use in automotive under-hood and industrial environments. |
| Standard TO-92 compatibility | SOT54A footprint matches legacy TO-92 layouts with widened lead spacing (5.08 mm), easing drop-in replacement in existing designs. |
| Complementary NPN pairing | BC337 is the designated NPN complement, enabling push-pull output stages and balanced amplifier designs. |
Applications
| Industrial Relay Driver | Linear Voltage Regulator Pass Element |
|---|---|
|
Use Scenario: Driving 24 V DC industrial relays with coil resistance ~200 Ω in PLC I/O modules. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking relay coil current to ground when base is pulled low. Use Value: −500 mA IC rating and −700 mV VCE(sat) minimize heat generation and ensure reliable coil actuation without external heat sinking. |
Use Scenario: Acting as pass transistor in adjustable linear regulators supplying 3.3 V/500 mA to microcontroller subsystems. IC Role / Device Role / Timing Role: Series pass element controlling output voltage via base-emitter voltage feedback loop. Use Value: 625 mW Ptot and 200 K/W Rth(j-a) allow stable operation at 1.5 W dissipation margin with modest heatsinking in 5 V → 3.3 V conversion. |
| Legacy Audio Amplifier Stage | Power Supply Feedback Transistor |
|
Use Scenario: Low-noise preamplifier stage in analog audio signal chains requiring moderate gain and linearity. IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region for voltage amplification of line-level signals. Use Value: hFE = 100–250 and fT = 80 MHz support bandwidth up to ~100 kHz with low distortion in Class-A configurations. |
Use Scenario: Error amplifier transistor in isolated flyback converter feedback networks using optocouplers. IC Role / Device Role / Timing Role: Current source/sink controlling optocoupler LED current based on secondary-side voltage error. Use Value: −5 V VEBO and −45 V VCEO withstand transient coupling across transformer while maintaining precise regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC327-16,112 | SOT54 variant (on-circle pinning); identical electrical specs but different lead geometry (L2 = 2.5 mm vs. SOT54A's 5.08 mm pitch). | Requires PCB footprint adjustment; not suitable for direct replacement in SOT54A-layout boards. | Select only if board layout accommodates delta-pin (on-circle) lead form and bulk packaging is preferred. |
| BC327-16,412 | SOT54 (standard TO-92 pitch, e = 2.54 mm); same hFE and voltage/current ratings, but narrower 2.54 mm lead spacing. | Fits legacy TO-92 footprints; incompatible with SOT54A's wide-pitch pads without trace modification. | Choose for cost-sensitive replacements where standard TO-92 spacing is available and tape-and-reel is unnecessary. |
Compared with BC327,126, BC327-16,112 offers identical performance in a mechanically distinct on-circle leadform, while BC327-16,412 provides the same electrical behavior in standard TO-92 pitch-both require layout verification before substitution in SOT54A-designed assemblies.
Availability
BC327,126 is available at Aetrix Electronics and suitable for industrial relay drivers, linear regulator pass elements, and power supply feedback circuits requiring stable component supply with long-term obsolescence mitigation.
Supply support for BC327,126 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 computing markets.
The BC327,126 belongs to Nexperia's legacy general-purpose BJT product line, designed specifically for cost-effective, robust through-hole switching and amplification in industrial control and power management systems.
FAQ
What is the pin configuration of BC327,126?
The BC327,126 uses SOT54A package with Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed in Table 3 and Figure 16 of the official Nexperia datasheet. This emitter-base-collector order differs from SOT23/SOT323 variants and must be observed during PCB layout and assembly to avoid reverse-bias damage or circuit malfunction.
What does the "126" suffix in BC327,126 indicate?
The "126" suffix in BC327,126 denotes the packing method: tape-and-reel with wide-pitch (SOT54A) format, per Table 9 of the datasheet. It is not a performance grade or temperature variant - all BC327-16 devices share identical electrical characteristics regardless of suffix.
Is BC327,126 pin-compatible with BC337?
No, BC327,126 is not pin-compatible with BC337. While BC337 is its NPN complement, it shares the same SOT54A package and pinout (Emitter-Base-Collector), but opposite polarity means direct substitution would invert logic states and likely damage circuits unless topology is redesigned.
What is the maximum power dissipation of BC327,126 at 70 °C ambient?
At 70 °C ambient, BC327,126 maximum power dissipation is derated to 475 mW, calculated as Ptot(70°C) = 625 mW × (1 − (70 − 25)/200) using Rth(j-a) = 200 K/W. Exceeding this risks junction temperature exceeding 150 °C and permanent degradation.
Does BC327,126 support pulsed operation beyond its DC current rating?
Yes, BC327,126 supports peak collector current (ICM) of −1 A under pulse conditions (tp ≤ 300 μs, duty cycle δ ≤ 0.02), as specified in Table 2. This enables short-duration surge handling in motor commutation or inductive load switching, provided average power remains within 625 mW limits.
BC327,126 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- 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
BC327,126 FAQ
1.How can I place an order for BC327,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC327,126 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 BC327,126 reliable?
The price and inventory of BC327,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC327,126 is usually 5 days.
3.What payment methods are accepted for BC327,126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC327,126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC327,126?
BC327,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC327,126 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 BC327,126?
For technical support, including BC327,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC327,126 requirements.
6.How does Aetrix verify that BC327,126 is sourced from the original manufacturer or authorized distributors?
All BC327,126 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 BC327,126 meets industry standards.
7.What is the process for return or replacement of BC327,126?
All BC327,126 units undergo pre-shipment inspection (PSI). If there is an issue with BC327,126, 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 BC327,126 part is unused and in its original packaging.
Return procedure for BC327,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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