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Diodes Incorporated AC857CWQ-7
- Part No.:
- AC857CWQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
AC857CWQ-7.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:3,110
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Product details
Overview
AC857CWQ from Diodes Incorporated is a 45V PNP small-signal bipolar junction transistor (BJT) in SOT323 package, rated for -100mA continuous collector current, -45V VCEO, and 100–200MHz transition frequency (fT). It is AEC-Q101 qualified and designed for automotive switching and audio-frequency amplifier applications.
For engineers reviewing the AC857CWQ datasheet, AC857CWQ pinout, AC857CWQ application, or AC857CWQ equivalent, key selection criteria include its -45V VCEO, high DC current gain (hFE = 420–800 at IC = -2mA), low VCE(sat) (-75 to -650mV), automotive qualification, and SOT323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This PNP BJT operates with emitter-base forward bias and collector-base reverse bias in active or saturation regions. Its fT of 100–200MHz supports AF amplification up to ~20kHz with margin, while VBE(on) of -600 to -820mV at IC = -2mA to -10mA defines base drive requirements.
The device's thermal resistance RθJA = 625°C/W (on 1oz FR4) and 200mW power dissipation limit operation under ambient temperatures up to +150°C when derated per Fig. 1, and its -15nA ICBO at VCB = -30V ensures low leakage in high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -45V - Maximum safe collector-emitter voltage before breakdown; sets upper rail limit in PNP switch or amplifier stages. |
| IC (cont.) | -100mA - Continuous collector current rating; determines load-driving capability in linear or switching modes. |
| hFE | 420–800 - DC current gain at VCE = -5V, IC = -2mA; enables low-base-current biasing in amplifier designs. |
| fT | 100–200MHz - Gain-bandwidth product; supports stable AF amplification with >10× bandwidth margin at 20kHz. |
| VCE(sat) | -75 to -650mV - Saturation voltage across C–E at IC/IB = 10–20; defines conduction loss in switching applications. |
| RθJA | 625°C/W - Junction-to-ambient thermal resistance on standard FR4; requires derating above +25°C ambient per Fig. 1. |
Pinout & Package
Package: SOT323 - ultra-small surface-mount plastic package (2.15 × 2.10 × 0.95 mm), moisture sensitivity level 1, lead-free and halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current source terminal in PNP configuration; connects to higher potential rail in common-emitter switches. |
| 2 (Base) | B | Control input; requires negative bias relative to emitter to turn on; low IB needed due to high hFE. |
| 3 (Collector) | C | Current sink terminal; connects to load and lower-potential node; handles full load current in saturation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| SOT323 footprint | Enables high-density placement in compact modules such as body control units and sensor signal conditioners. |
| Low VCE(sat) | -75mV typical at IC = -10mA/IB = -0.5mA - reduces power loss and self-heating in always-on bias circuits. |
| High hFE group C | Min 420 at IC = -2mA - allows single-stage amplification with minimal base drive circuitry. |
Applications
| Automotive Door Module Switching | Engine Control Unit (ECU) Signal Inversion |
|---|---|
Use Scenario: Driving LED status indicators and small solenoid loads in door latch assemblies. IC Role / Device Role / Timing Role: PNP switch controlling 12V loads with microcontroller GPIO-level base drive. Use Value: Low VCE(sat) minimizes heat rise in sealed modules; AEC-Q101 ensures 15-year field life under thermal cycling. | Use Scenario: Level-shifting and inverting sensor feedback signals (e.g., throttle position) before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter amplifier providing gain and polarity inversion for analog conditioning. Use Value: High hFE and 200MHz fT maintain signal fidelity up to 10kHz without phase distortion. |
| Body Control Module (BCM) Load Driver | Infotainment System Audio Preamp Stage |
Use Scenario: Controlling interior lighting and mirror adjustment motors in BCMs. IC Role / Device Role / Timing Role: High-side switch enabling load connection to battery rail with logic-level enable. Use Value: -45V VCEO withstands load-dump transients; SOT323 saves board area in multi-channel driver IC replacements. | Use Scenario: First-stage amplification of microphone or line-in signals prior to DSP processing. IC Role / Device Role / Timing Role: Low-noise AF amplifier (NF = 10dB @ 1kHz) with stable gain across temperature. Use Value: 10dB noise figure and -650mV VCE(sat) support clean signal amplification with minimal added distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857C,215 (Nexperia) | VCEO = -45V, hFE = 420–800, same SOT323, but not AEC-Q101 qualified. | Lacks automotive qualification; suitable only for industrial/commercial use. | Select if AEC-Q101 is not required and cost is prioritized over automotive compliance. |
| MMBT857LT1G (ON Semiconductor) | VCEO = -45V, hFE = 250–630, SOT23 package (larger footprint), AEC-Q101 qualified. | SOT23 requires PCB redesign; lower hFE demands higher base drive current. | Choose only if SOT23 is already standardized in design and higher IB is acceptable. |
Compared with BC857C,215 and MMBT857LT1G, AC857CWQ uniquely combines AEC-Q101 qualification, SOT323 footprint, and top-tier hFE range-making it optimal for new automotive designs where space, reliability, and gain consistency are jointly constrained.
Availability
AC857CWQ is available at Aetrix Electronics and suitable for automotive door modules, engine control units, body control modules, and infotainment audio preamplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AC857CWQ 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets.
The AC857CWQ belongs to Diodes' AEC-Q101-qualified small-signal transistor family, engineered specifically for automotive switching and amplification functions where thermal stability, gain consistency, and footprint miniaturization are critical.
FAQ
Is AC857CWQ pin-compatible with BC857 series transistors?
Yes - AC857CWQ uses the SOT323 package with identical pinout (Emitter-Base-Collector on pins 1-2-3), matching BC857C variants. However, it is not a drop-in replacement for non-AEC-Q101 versions in automotive applications due to qualification and traceability requirements.
What is the maximum operating temperature for AC857CWQ in continuous operation?
The AC857CWQ has an operating junction temperature range of -65°C to +150°C. At +150°C ambient, its 200mW power dissipation must be reduced per Fig. 1; full-rated power is only valid up to +25°C ambient with proper PCB thermal relief.
Does AC857CWQ require external base resistors in switching applications?
Yes - base current must be limited to prevent damage. For IC = -100mA and hFE ≥ 420, minimum IB ≈ -240µA; a 10kΩ resistor from 3.3V MCU GPIO provides ~330µA, ensuring saturation while avoiding excessive base drive.
Can AC857CWQ be used in linear amplifier configurations?
Yes - its fT of 100–200MHz and low noise figure (10dB @ 1kHz) support stable AF amplification. Use VCE = -5V and IC = -2mA for optimal hFE and linearity; ensure thermal derating if power dissipation exceeds 100mW in continuous operation.
AC857CWQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
AC857CWQ-7 FAQ
1.How can I place an order for AC857CWQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AC857CWQ-7 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 AC857CWQ-7 reliable?
The price and inventory of AC857CWQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AC857CWQ-7 is usually 5 days.
3.What payment methods are accepted for AC857CWQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AC857CWQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AC857CWQ-7?
AC857CWQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AC857CWQ-7 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 AC857CWQ-7?
For technical support, including AC857CWQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AC857CWQ-7 requirements.
6.How does Aetrix verify that AC857CWQ-7 is sourced from the original manufacturer or authorized distributors?
All AC857CWQ-7 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 AC857CWQ-7 meets industry standards.
7.What is the process for return or replacement of AC857CWQ-7?
All AC857CWQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with AC857CWQ-7, 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 AC857CWQ-7 part is unused and in its original packaging.
Return procedure for AC857CWQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AC857CWQ-7 Tags
-
MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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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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