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Nexperia USA Inc. BC817-40W-QX
- Part No.:
- BC817-40W-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC817-40W-QX.pdf
- Description:
- TRANS NPN 45V 0.5A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:23,755
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Product details
Overview
BC817-40W-Q from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT323 (SC-70) package, rated for 45 V VCEO, 500 mA continuous collector current, and DC current gain (hFE) of 250–600 at VCE = 1 V and IC = 100 mA. It serves as a compact, automotive-grade switching and amplification device in space-constrained PCBs for body control modules and sensor interface circuits.
For engineers reviewing the BC817-40W-Q datasheet, BC817-40W-Q pinout, BC817-40W-Q application, or BC817-40W-Q equivalent, key selection criteria include its AEC-Q101 qualification, hFE binning consistency, thermal resistance (Rth(j-a) = 431 K/W with 1 cm² collector pad), and SC-70 footprint compatibility with high-density automotive signal routing.
Technical Context
This discrete NPN bipolar junction transistor operates in linear or saturated switching modes, with base-emitter voltage (VBE) of ≤1.2 V at IC = 500 mA and collector-emitter saturation voltage (VCE(sat)) ≤700 mV under IC/IB = 10. Its fT of 100 MHz supports moderate-speed digital and analog signal handling.
Thermal performance is defined by two derating curves: 290 mW total power dissipation on FR4 with 1 cm² collector pad, and 200 mW on standard footprint; junction temperature is rated to 150 °C, enabling operation in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown; enables use in 24 V automotive supply rails with margin. |
| IC | 500 mA - Continuous DC collector current rating; supports driving small relays, LEDs, or logic-level MOSFET gates. |
| hFE | 250–600 - DC current gain at VCE = 1 V, IC = 100 mA; ensures stable biasing across temperature and process variation. |
| VCE(sat) | ≤700 mV - Low saturation voltage at IC = 500 mA, IB = 50 mA; minimizes conduction loss in switching applications. |
| fT | 100 MHz - Transition frequency at VCE = 5 V, IC = 10 mA; sufficient for PWM control up to ~10 MHz and audio preamplifier stages. |
| Rth(j-a) | 431 K/W - Thermal resistance with optimized 1 cm² copper pad; allows ~290 mW power dissipation at Tamb = 85 °C. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: ultra-compact 3-lead outline measuring 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), optimized for automated placement and reflow soldering on high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires ~1.2 V forward bias and 50 mA drive for full saturation at 500 mA collector load. |
| 2 | Emitter (E) | Current return path; internally connected to substrate; must be tied to ground or low-impedance reference in common-emitter configuration. |
| 3 | Collector (C) | High-side output node; thermally coupled to PCB copper; layout must allocate ≥1 cm² pad for thermal management per datasheet Fig. 1. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, lighting, and body electronics per stress test requirements. |
| Three hFE bins | BC817-40W-Q provides tight 250–600 gain range-reducing need for external gain-trimming resistors in production designs. |
| Low VCE(sat) | ≤700 mV at IC/IB = 10 ensures <150 mW conduction loss at 500 mA, improving efficiency in battery-powered modules. |
| SC-70 footprint | Standardized 0.65 mm pitch enables drop-in replacement with other SOT323 transistors and compatibility with mainstream pick-and-place equipment. |
Applications
| Automotive Door Module Switching | Industrial Sensor Signal Amplification |
|---|---|
|
Use Scenario: Driving window lift motor enable lines and door lock solenoids in 12 V/24 V body control units. IC Role / Device Role / Timing Role: NPN switch controlling 300–500 mA inductive loads with flyback diode protection. Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle life; low VCE(sat) reduces heat buildup in sealed modules. |
Use Scenario: Amplifying low-level analog outputs from temperature or pressure sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed-gain bias network for 0–5 V signal conditioning. Use Value: Tight hFE bin (250–600) minimizes calibration drift; fT >100 MHz preserves signal integrity up to 10 kHz bandwidth. |
| LED Driver for Dashboard Backlighting | Power Supply Enable Control |
|
Use Scenario: Constant-current switching for white LED strings in instrument cluster backlighting. IC Role / Device Role / Timing Role: Saturated switch regulating LED current via base-driven PWM at 1–10 kHz. Use Value: 500 mA rating supports up to 12 parallel LEDs; SC-70 size saves board area in tight dashboard layouts. |
Use Scenario: Enabling/disabling secondary LDOs or DC-DC converters in multi-rail embedded power systems. IC Role / Device Role / Timing Role: High-side or low-side enable switch interfacing with microcontroller GPIO pins. Use Value: VCEO = 45 V accommodates 36 V industrial supplies; fast turn-on/off supports dynamic power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC817-40-7-F (Diodes Inc.) | Same hFE range (250–600), but not AEC-Q101 qualified; Rth(j-a) = 500 K/W on standard footprint. | Limited to commercial/industrial use; unsuitable for automotive safety-critical functions. | Select when cost sensitivity outweighs automotive qualification and thermal margin is acceptable. |
| MMBT4401 (ON Semiconductor) | Higher VCEO = 40 V (vs. 45 V); hFE = 100–300 at same test conditions; SOT23 package (larger than SC-70). | Lower gain consistency requires tighter bias resistor tolerances; larger footprint consumes more PCB area. | Choose only if legacy SOT23 footprint compatibility is mandatory and gain spread is manageable in design. |
Compared with BC817-40W-Q, BC817-40-7-F lacks automotive qualification and has higher thermal resistance, while MMBT4401 trades gain stability and package size for broader vendor availability-making BC817-40W-Q optimal for new AEC-compliant, space-constrained designs.
Availability
BC817-40W-Q is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and LED driver circuits requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BC817-40W-Q 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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BC817W-Q series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor portfolio, designed specifically for robust, cost-effective switching and amplification in automotive and industrial control systems where reliability and thermal performance are critical.
FAQ
Is BC817-40W-Q pin-compatible with BC817-16W-Q or BC817-25W-Q?
Yes-BC817-40W-Q shares identical SOT323 package, pinout (B-E-C), and mechanical footprint with all BC817W-Q series variants. Only the hFE bin differs: 250–600 for -40W-Q versus 100–250 for -16W-Q and 160–400 for -25W-Q. No layout change is needed when upgrading gain grade.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current is 200 mA per datasheet Table 6, but for continuous DC operation, base current should be limited to ensure junction temperature stays within 150 °C. At IC = 500 mA and hFE = 250, IB ≈ 2 mA is sufficient; typical design uses 5–10 mA for safety margin and faster switching.
Can BC817-40W-Q replace BC847C in existing designs?
No-BC847C is in SOT23 package with different pinout (E-B-C), higher VCEO (45 V same), but lower IC (100 mA). Direct replacement requires PCB redesign due to package mismatch and insufficient current rating for 500 mA loads. Use only after verifying thermal and electrical margins.
Does the "Q" suffix guarantee automotive qualification?
Yes-the "Q" suffix in BC817-40W-Q explicitly denotes AEC-Q101 qualification per Nexperia's product naming convention and datasheet Section 11.1. This includes stress testing for temperature cycling, humidity, ESD, and high-temperature operating life-verified and documented for automotive use.
BC817-40W-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC817W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- 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:
- 250 @ 100mA, 1V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC817-40W-QX FAQ
1.How can I place an order for BC817-40W-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-40W-QX 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 BC817-40W-QX reliable?
The price and inventory of BC817-40W-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40W-QX is usually 5 days.
3.What payment methods are accepted for BC817-40W-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40W-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-40W-QX?
BC817-40W-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-40W-QX 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 BC817-40W-QX?
For technical support, including BC817-40W-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40W-QX requirements.
6.How does Aetrix verify that BC817-40W-QX is sourced from the original manufacturer or authorized distributors?
All BC817-40W-QX 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 BC817-40W-QX meets industry standards.
7.What is the process for return or replacement of BC817-40W-QX?
All BC817-40W-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40W-QX, 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 BC817-40W-QX part is unused and in its original packaging.
Return procedure for BC817-40W-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817-40W-QX Tags
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MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
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