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NXP Semiconductors BC635-16,126
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- Part No.:
- BC635-16,126
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC635-16,126.pdf
- Description:
- TRANS NPN 45V 1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,741
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Product details
Overview
BC635-16,126 from NXP Semiconductors is a 45 V, 1 A NPN medium power transistor in SOT54A (SC-43A/TO-92 compatible) package, featuring hFE = 100–250 at IC = 150 mA and VCE = 2 V, rated for linear voltage regulators, low-side switching, and MOSFET driver stages in industrial control and power management circuits.
For engineers reviewing the BC635-16,126 datasheet, BC635-16,126 pinout, BC635-16,126 application, or BC635-16,126 equivalent, this page delivers verified electrical parameters, thermal derating behavior on FR4 PCBs, hFE selection (-16 variant), SOT54A pin mapping, and direct alternatives for discrete BJT replacement in analog and switching power designs.
Technical Context
The BC635-16,126 operates as a silicon NPN bipolar junction transistor with fixed emitter-base and collector-base junction structures optimized for medium-power linear and switching operation. Its hFE binning (-16) guarantees minimum DC current gain of 100 at 150 mA collector current and 2 V VCE, enabling predictable base drive sizing in amplifier and switch configurations.
Thermal performance is defined for mounting on FR4 PCB with standard footprint (Rth(j-a) = 150 K/W) and includes transient thermal impedance data for pulse-width modulation applications. Absolute maximum ratings include VCBO = 45 V, VEBO = 5 V, ICM = 1.5 A (1 ms pulse), and Tj = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; sets upper rail limit in linear regulators and switch-mode drivers. |
| IC | 1 A continuous - Rated collector current defines steady-state load-handling capability in low-side switches and driver stages. |
| hFE (-16) | 100–250 at VCE = 2 V, IC = 150 mA - Guaranteed current gain range enables precise base resistor calculation for saturation and active-region biasing. |
| Ptot | 0.83 W at Tamb ≤ 25 °C (FR4, standard footprint) - Power dissipation limit determines heatsinking requirements in linear applications. |
| Rth(j-a) | 150 K/W - Junction-to-ambient thermal resistance under standard PCB layout; used to calculate temperature rise under load. |
| fT | 100–180 MHz - Transition frequency supports high-speed switching up to ~10–20 MHz with adequate gain margin. |
| VCE(sat) | ≤ 500 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in switching applications. |
Pinout & Package
SOT54A (JEITA SC-43A / JEDEC TO-92 compatible) plastic through-hole package with 3 leads, tin-plated, single-ended leaded construction. Standard footprint on FR4 PCB; no thermal pad required.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; requires current-limited drive to achieve target IC; base-emitter voltage ≤ 1 V at IC = 500 mA. |
| 2 | Collector | High-current output node; connected to load or power rail; must be routed with adequate copper area for thermal management. |
| 3 | Emitter | Reference terminal; typically grounded in low-side switch configuration; forms return path for collector current. |
Key Features
| Feature | Design Value |
|---|---|
| Two hFE selections | BC635-16 provides guaranteed hFE ≥ 100 (vs. BC635-10's ≥ 63), reducing base drive uncertainty in production designs. |
| High power dissipation | 0.83 W rating on standard FR4 allows use in linear regulators without external heatsink below ~500 mW dissipation. |
| Peak collector current | 1.5 A (1 ms pulse) supports surge handling in motor drivers and inrush-limited power supplies. |
| Low VCE(sat) | ≤ 500 mV ensures <1.5 W conduction loss at 3 A peak, improving efficiency in pulsed switching applications. |
| Wide operating temperature | −65 °C to +150 °C junction range enables deployment in automotive under-hood and industrial ambient environments. |
Applications
| Linear Voltage Regulators | Low-Side Switches |
|---|---|
Use Scenario: Discrete pass transistor in adjustable 3-terminal linear regulator (e.g., LM317-based) delivering up to 1 A load current. IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via base bias network; dissipates excess input-output differential power. Use Value: 0.83 W Ptot and 150 °C Tj allow stable regulation at 5 V/1 A with 12 V input (7 W dissipation managed via PCB copper area). |
Use Scenario: Ground-referenced load switch for solenoids, relays, or LED arrays in PLC I/O modules. IC Role / Device Role / Timing Role: Saturated NPN switch controlled by microcontroller GPIO; emitter tied to GND, collector to load cathode. Use Value: VCE(sat) ≤ 500 mV limits conduction loss to <0.5 W at 1 A, minimizing self-heating during continuous duty cycles. |
| MOSFET Drivers | Amplifiers |
Use Scenario: Level-shifting stage driving N-channel power MOSFET gate in half-bridge motor controller. IC Role / Device Role / Timing Role: High-current NPN buffer amplifying logic-level signal to deliver >100 mA peak gate charge current. Use Value: fT ≥ 100 MHz and ICM = 1.5 A enable fast turn-on of 10 nF gate capacitance within 100 ns, reducing switching losses. |
Use Scenario: Class-A audio preamplifier stage or sensor signal conditioning amplifier in industrial instrumentation. IC Role / Device Role / Timing Role: Linear-mode NPN common-emitter amplifier with emitter degeneration resistor for stable gain and bandwidth. Use Value: hFE = 100–250 and fT = 180 MHz support mid-band gain >40 dB with <1% THD at 1 kHz, suitable for precision analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC635-10,126 | Lower hFE bin: 63–160 vs. 100–250; same VCEO, IC, package, and thermal specs. | Less predictable base drive in high-gain amplifier or low-IB switch designs; may require larger base resistor. | Select BC635-10,126 only when gain tolerance >60% is acceptable and cost optimization is prioritized. |
| BCX54-16,115 | SOT89 surface-mount package; higher Rth(j-a) (250 K/W std, 100 K/W w/6 cm² pad); same hFE bin and VCEO/IC ratings. | Requires PCB thermal pad for >0.5 W operation; not drop-in replaceable due to different footprint and pinout (emitter-collector-base). | Choose BCX54-16,115 for space-constrained SMT designs where thermal pad integration is feasible and through-hole assembly is undesirable. |
Compared with BC635-16,126, the BC635-10,126 offers lower-cost gain binning but demands more conservative base drive design, while BCX54-16,115 trades through-hole manufacturability for SMT density and improved thermal performance under optimized layout-neither is pin-compatible, requiring board revision.
Availability
BC635-16,126 is available at Aetrix Electronics and suitable for linear voltage regulators, low-side switches, and MOSFET drivers requiring stable component supply across industrial control, power management, and embedded system production programs.
Supply support for BC635-16,126 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions, automotive processors, and analog/power discrete components.
The BC635 series belongs to NXP's legacy medium-power bipolar transistor product line, designed specifically for cost-sensitive, reliability-critical linear and switching applications in industrial and consumer power systems.
FAQ
What is the exact hFE range guaranteed for BC635-16,126?
The BC635-16,126 is binned to guarantee hFE between 100 and 250 when measured at VCE = 2 V and IC = 150 mA. This tighter lower bound (vs. BC635-10's 63) reduces base current variation across production lots, improving consistency in amplifier gain and switch saturation design for the BC635-16,126.
Is BC635-16,126 supplied in tape-and-reel or bulk packaging?
BC635-16,126 is supplied in tape-and-reel format per ordering code -126, designated as "tape ammopack, wide pitch" for SOT54A packaging. This format supports automated pick-and-place assembly and is distinct from bulk or straight-lead variants like -412. The BC635-16,126 reel quantity is 4000 units per reel.
Can BC635-16,126 replace BC635-16 in existing designs?
Yes - BC635-16,126 is functionally identical to BC635-16 except for the packaging method: -126 denotes tape ammopack for SOT54A, whereas BC635-16 alone refers to the base type number. All electrical, thermal, and mechanical specifications-including hFE bin, VCEO, IC, and SOT54A pinout-are fully shared by BC635-16,126 and BC635-16.
What is the maximum safe operating temperature for BC635-16,126?
The BC635-16,126 has a maximum junction temperature (Tj) of 150 °C and storage temperature range of −65 °C to +150 °C. Ambient temperature must be limited such that power dissipation (Ptot = 0.83 W max at 25 °C) does not cause Tj to exceed 150 °C-derating begins linearly above 25 °C at 6.6 mW/°C based on Rth(j-a) = 150 K/W.
Does BC635-16,126 have a PNP complement, and what is its part number?
Yes, the PNP complement to BC635-16,126 is BC636, which shares identical voltage, current, and package specifications (SOT54A) but with opposite polarity. BC636 is commonly used in complementary emitter-follower or push-pull output stages alongside BC635-16,126 in linear regulators and audio amplifiers.
BC635-16,126 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:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 150mA, 2V
- Power - Max:
- 830 mW
- Frequency - Transition:
- 180MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC635-16,126 FAQ
1.How can I place an order for BC635-16,126 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC635-16,126 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 BC635-16,126 reliable?
The price and inventory of BC635-16,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC635-16,126 is usually 5 days.
3.What payment methods are accepted for BC635-16,126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC635-16,126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC635-16,126?
BC635-16,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC635-16,126 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 BC635-16,126?
For technical support, including BC635-16,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC635-16,126 requirements.
6.How does Aetrix verify that BC635-16,126 is sourced from the original manufacturer or authorized distributors?
All BC635-16,126 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 BC635-16,126 meets industry standards.
7.What is the process for return or replacement of BC635-16,126?
All BC635-16,126 units undergo pre-shipment inspection (PSI). If there is an issue with BC635-16,126, 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 BC635-16,126 part is unused and in its original packaging.
Return procedure for BC635-16,126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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