My Inquiry
My Account
Nexperia USA Inc. BC817-40QCH-QZ
- Part No.:
- BC817-40QCH-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC817-40QCH-QZ.pdf
- Description:
- TRANS NPN 45V 0.5A DFN1412D-3
- Quantity:
- Payment:
- Shipping:
Inventory:24,689
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC817-40QCH-Q from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in a leadless DFN1412D-3 (SOT8009) package, rated for 45 V VCEO, 500 mA IC, and DC current gain (hFE) of 250–600 at VCE = 1 V and IC = 100 mA. It operates up to 175 °C junction temperature and supports automotive-grade switching in space-constrained PCB layouts.
For engineers reviewing the BC817-40QCH-Q datasheet, BC817-40QCH-Q pinout, BC817-40QCH-Q application, or BC817-40QCH-Q equivalent, key selection criteria include its side-wettable flank design for AOI-compatible solder joint inspection, low 0.5 mm profile, 3-pin SMT footprint, and validated performance across −55 °C to +175 °C ambient conditions.
Technical Context
This discrete NPN bipolar junction transistor delivers high-current switching with low VCE(sat) of ≤700 mV at IC = 500 mA and IB = 50 mA, and exhibits robust thermal performance: Rth(j-a) = 261 K/W on 70 μm FR4 copper. Its hFE range (250–600) enables precise biasing control in linear and saturated operation modes.
The device features V(BR)CEO = 45 V, V(BR)CBO = 50 V, and V(BR)EBO = 5 V - supporting reliable operation in 12 V and 24 V automotive subsystems. Its fT ≥ 100 MHz ensures stable small-signal amplification up to RF front-end frequencies in sensor interface circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; supports 24 V automotive rail switching with margin. |
| IC | 500 mA continuous - Enables direct drive of medium-power loads like relays, LEDs, and small solenoids. |
| hFE | 250–600 at VCE = 1 V, IC = 100 mA - High and tightly binned gain simplifies base resistor selection for predictable saturation. |
| VCE(sat) | ≤700 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in power-switching nodes. |
| Tj(max) | 175 °C - Enables deployment in under-hood automotive modules without derating in high-ambient environments. |
| Ptot | 575 mW on 70 μm FR4 - Sufficient thermal headroom for sustained operation in compact, thermally isolated PCB zones. |
| fT | ≥100 MHz - Supports signal amplification and fast switching in sensor conditioning and PWM control feedback paths. |
Pinout & Package
DFN1412D-3 (SOT8009) is a 3-terminal, leadless, ultra-thin surface-mount package measuring 1.4 × 1.2 × 0.5 mm with side-wettable flanks for automated optical inspection of solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires external series resistor to limit IB and ensure saturation at target IC. |
| 2 | Emitter (E) | Reference terminal for bias network; connected directly to ground or low-side return path in common-emitter configuration. |
| 3 | Collector (C) | High-current output node; interfaces with load (e.g., relay coil, LED string) between supply rail and collector. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Side-wettable flanks | Enables 100% automated optical inspection (AOI) of solder fillets without X-ray, reducing post-reflow defect escapes. |
| 0.5 mm package height | Reduces board stack height in multi-layer modules such as telematics units and infotainment head units. |
| Three hFE bins (16/25/40) | Allows precision gain matching across production batches for consistent analog front-end and feedback loop behavior. |
| −55 °C to +175 °C operating range | Supports placement near heat sources (e.g., power converters, motor drivers) without thermal derating or heatsinking. |
Applications
| Automotive Door Module | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Driving window lift motor relays and door lock actuators in centralized body control modules. IC Role / Device Role / Timing Role: NPN switch controlling 12 V inductive loads with flyback diode protection. Use Value: AEC-Q101 qualification and 175 °C Tj ensure reliability in hot under-dash environments without thermal shutdown. |
Use Scenario: Amplifying low-level analog signals from RTD or thermistor bridges in PLC analog input cards. IC Role / Device Role / Timing Role: Linear-mode current source or emitter-follower buffer for signal conditioning stages. Use Value: Tight hFE bin (250–600) and low VBE drift (−2 mV/K) maintain measurement accuracy across industrial temperature ranges. |
| LED Driver for Interior Lighting | Power Sequencing Control |
|
Use Scenario: Switching 24 V LED strips in commercial vehicle cabin lighting systems with PWM dimming. IC Role / Device Role / Timing Role: Saturated switch in common-emitter topology, driven by MCU GPIO with current-limiting base resistor. Use Value: VCE(sat) ≤700 mV limits power dissipation to <150 mW at 200 mA, enabling use without heatsink in sealed enclosures. |
Use Scenario: Enabling power rails in sequence for FPGA or microcontroller subsystems during cold start. IC Role / Device Role / Timing Role: Low-side enable switch controlling gate of external PMOS high-side switch. Use Value: Fast turn-on/off (enabled by fT ≥100 MHz) ensures precise timing alignment between rail activation events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC817-40,215 (SOT23) | Larger SOT23 package (2.9 × 1.3 × 1.0 mm); no side-wettable flanks; lower thermal resistance not specified; same hFE bin. | Not qualified to AEC-Q101; unsuitable for automotive production; limited to consumer/industrial PCBs with manual AOI or X-ray inspection. | Select when cost sensitivity outweighs AOI capability and automotive compliance requirements. |
| MMBT4401LT1G | Higher VCEO (40 V), lower hFE (100–300), TO-236AB (SOT23) package; no AEC-Q101 rating; Rth(j-a) ≈ 300 K/W. | Designed for general-purpose amplification; lacks automotive qualification and thermal robustness for under-hood use. | Choose only for non-automotive, low-power linear amplifier roles where gain spread and thermal margin are less critical. |
Compared with BC817-40,215 and MMBT4401LT1G, BC817-40QCH-Q uniquely combines AEC-Q101 qualification, side-wettable flanks for AOI, 0.5 mm height, and 175 °C operation - making it the sole option for space-constrained, thermally demanding automotive switching applications requiring zero-defect solder joint verification.
Availability
BC817-40QCH-Q is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and interior LED lighting systems requiring stable component supply and long-term lifecycle support.
Supply support for BC817-40QCH-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 essential efficiency-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.
The BC817QCH-Q series belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for automotive-grade switching and amplification in thermally aggressive, space-limited PCB environments.
FAQ
Is BC817-40QCH-Q pin-compatible with standard SOT23 NPN transistors?
No - BC817-40QCH-Q uses the DFN1412D-3 (SOT8009) leadless package with three side-wettable terminals (B-E-C), differing physically and electrically from through-hole or SOT23 packages. Its footprint, soldering profile, and thermal pad requirements are unique; direct replacement requires PCB redesign and requalification.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current is 200 mA per datasheet limiting values, but for continuous DC operation, IB must be sized to maintain IC ≤ 500 mA while ensuring VCE(sat) remains ≤700 mV. At hFE(min) = 250, IB ≥ 2 mA is required; typical design uses IB = 5–50 mA depending on switching speed and saturation margin.
Does BC817-40QCH-Q require a thermal pad or exposed copper on the PCB?
No - the DFN1412D-3 package has no thermal pad; heat dissipation occurs through the copper traces connected to pins 1–3. Optimal thermal performance requires minimum 70 μm copper on FR4, with recommended land patterns per Figure 17 (sot8009_fr), including solder paste stencil thickness of 0.1 mm.
Can BC817-40QCH-Q be used in linear amplifier configurations?
Yes - its hFE stability (250–600), low VBE drift (−2 mV/K), and fT ≥ 100 MHz support Class-A and emitter-follower amplifier topologies. However, Ptot derating must be applied above 25 °C ambient, and bias networks must ensure operation within VCEO and IC limits to avoid thermal runaway.
BC817-40QCH-QZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC817QCH-Q
- Package/Case:
- 3-XDFN Exposed Pad
- 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:
- 455 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1412D-3
BC817-40QCH-QZ FAQ
1.How can I place an order for BC817-40QCH-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-40QCH-QZ 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 BC817-40QCH-QZ reliable?
The price and inventory of BC817-40QCH-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40QCH-QZ is usually 5 days.
3.What payment methods are accepted for BC817-40QCH-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40QCH-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-40QCH-QZ?
BC817-40QCH-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-40QCH-QZ 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 BC817-40QCH-QZ?
For technical support, including BC817-40QCH-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40QCH-QZ requirements.
6.How does Aetrix verify that BC817-40QCH-QZ is sourced from the original manufacturer or authorized distributors?
All BC817-40QCH-QZ 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 BC817-40QCH-QZ meets industry standards.
7.What is the process for return or replacement of BC817-40QCH-QZ?
All BC817-40QCH-QZ units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40QCH-QZ, 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 BC817-40QCH-QZ part is unused and in its original packaging.
Return procedure for BC817-40QCH-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817-40QCH-QZ Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
