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Diodes Incorporated AC857CQ-7
- Part No.:
- AC857CQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AC857CQ-7.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AC857CQ-7 from Diodes Incorporated is a PNP small-signal bipolar junction transistor (BJT) in SOT23 package, rated for VCEO = −45 V, IC = −100 mA, and hFE = 420–800 at IC = −2 mA, designed for automotive switching and audio-frequency amplifier applications per AEC-Q101 qualification.
For engineers reviewing the AC857CQ-7 datasheet, AC857CQ-7 pinout, AC857CQ-7 application, or AC857CQ-7 equivalent, key selection criteria include guaranteed DC current gain across temperature, low VCE(SAT) at high drive levels, AEC-Q101 reliability validation, and SOT23 lead-free mechanical compatibility with automated insertion processes.
Technical Context
This PNP BJT operates in common-emitter configuration with base-controlled current amplification. Its hFE range (420–800) and fT ≥ 100 MHz support stable linear amplification up to AF bands and fast switching in digital logic interfaces.
Thermal design is enabled by RθJA = 357 °C/W on 15 mm × 15 mm 1 oz copper, and ESD robustness includes 4 kV HBM rating-critical for automotive module assembly and under-hood signal conditioning circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage before breakdown in active mode |
| IC (cont.) | −100 mA: Continuous collector current limit defining steady-state power handling |
| hFE | 420–800 @ IC = −2 mA, VCE = −5 V: Guaranteed DC current gain range for predictable biasing |
| VCE(SAT) | −75 mV max @ IC = −10 mA, IB = −0.5 mA: Low saturation voltage enabling efficient switching with minimal conduction loss |
| fT | 100–200 MHz: Minimum transition frequency ensuring usable gain at audio and low-RF frequencies |
| ESD HBM | 4,000 V: Human-body-model ESD tolerance supporting robust PCB handling in automotive manufacturing |
| PD | 350 mW @ 15 mm × 15 mm copper: Thermal power limit under defined PCB layout conditions |
Pinout & Package
SOT23 plastic surface-mount package with matte tin-plated leads, UL 94V-0 flammability rating, and moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emission terminal for majority carriers | Connected to most positive rail in PNP switch configurations; defines current sink path |
| 2 (Base) | Control electrode for minority carrier injection | Receives negative drive current to turn on; requires current-limiting resistor in discrete bias networks |
| 3 (Collector) | Current collection terminal | Typically tied to load and ground-return path; handles full switched/signal current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade temperature cycling (−65°C to +150°C), vibration, and humidity stress |
| Lead-free & halogen-free | Meets RoHS 2 (2011/65/EU) and Diodes Inc.'s "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb) |
| Low VBE(ON) | −600 to −750 mV @ IC = −2 mA: Enables reliable turn-on with standard logic-level drive |
| High hFE consistency | Min 420 at IC = −2 mA ensures stable gain across production lots and temperature |
| SOT23 auto-insertion compatibility | Standard footprint and lead geometry support high-speed pick-and-place and reflow soldering |
Applications
| Automotive Door Module Switching | Infotainment System Audio Preamp |
|---|---|
Use Scenario: Controlling window lift motor direction via H-bridge driver stage in door control units. IC Role / Device Role / Timing Role: PNP switch providing high-side current sinking for complementary BJT pairs. Use Value: Low VCE(SAT) minimizes heat generation during continuous duty cycles; AEC-Q101 rating ensures field reliability over 15-year vehicle life. | Use Scenario: Amplifying microphone signals prior to ADC sampling in head unit voice recognition circuitry. IC Role / Device Role / Timing Role: Discrete PNP common-emitter amplifier stage with fixed bias network. Use Value: High hFE and low NF (2–10 dB) preserve SNR in low-level analog paths without requiring op-amp complexity. |
| Body Control Unit Load Driver | LED Interior Lighting Dimming |
Use Scenario: Driving solenoid locks and relay coils in centralized body electronics modules. IC Role / Device Role / Timing Role: Saturated-switch BJT interfacing microcontroller GPIO to inductive loads. Use Value: −650 mV VCE(SAT) at IC = −100 mA reduces power dissipation during extended activation periods. | Use Scenario: PWM-controlled current sink for RGB LED clusters in dashboard backlighting. IC Role / Device Role / Timing Role: Fast-switching PNP transistor modulating LED current at 1–10 kHz. Use Value: fT ≥ 100 MHz supports clean PWM edge fidelity; SOT23 footprint enables dense LED driver layout. |
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 | hFE = 420–800 (same range), but VCEO = −45 V and RθJA = 390 °C/W - lower thermal efficiency | No AEC-Q101 qualification; not approved for automotive use | Select only for non-automotive industrial or consumer designs where qualification is not required |
| MMBT857C | Same hFE range and AEC-Q101 qualification, but VCEO = −45 V and VCB0 = −50 V match exactly; RθJA = 357 °C/W identical | Identical functional replacement with same SOT23 marking and reel packaging | Drop-in alternative with identical electrical, thermal, and mechanical specs; suitable for supply chain diversification |
Compared with BC857C,215, AC857CQ-7 provides automotive qualification and superior thermal resistance; versus MMBT857C, it shares identical performance but differs in manufacturer-specific process and traceability documentation for OEM PPAP submissions.
Availability
AC857CQ-7 is available at Aetrix Electronics and suitable for automotive door modules, body control units, infotainment preamplifiers, and interior LED lighting systems requiring stable component supply and AEC-Q101 compliance.
Supply support for AC857CQ-7 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for automotive, industrial, and consumer markets.
The AC857CQ-7 belongs to Diodes' AEC-Q101-qualified small-signal transistor product line, engineered specifically for high-reliability automotive signal switching and amplification in space-constrained modules.
FAQ
What is the maximum operating temperature for AC857CQ-7?
The AC857CQ-7 is rated for junction and storage temperatures from −65°C to +150°C, validated per AEC-Q101 stress testing including temperature cycling and high-temperature operating life. This allows deployment in engine bay, transmission control, and under-dash environments where ambient temperatures exceed 105°C.
Does AC857CQ-7 support lead-free reflow soldering?
Yes. The AC857CQ-7 features matte tin-plated leads compatible with standard Pb-free reflow profiles (peak temperature ≤ 260°C, 20–40 sec dwell). Its SOT23 package meets J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to assembly.
How does AC857CQ-7 differ from AC857BQ-7?
The AC857CQ-7 has higher DC current gain (hFE = 420–800) versus AC857BQ-7 (hFE = 220–475), while sharing identical voltage ratings, thermal specs, and package. Both are AEC-Q101 qualified and pin-compatible; CQ grade is selected when tighter gain control or higher amplification is required.
Is PPAP documentation available for AC857CQ-7?
Yes. Diodes Incorporated provides full PPAP Level 3 documentation-including part submission warrant, design records, process flow diagrams, FMEA, control plans, and measurement system analysis-for AC857CQ-7 upon request, supporting Tier 1 automotive supplier compliance requirements.
AC857CQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 420 @ 2mA, 5V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AC857CQ-7 FAQ
1.How can I place an order for AC857CQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AC857CQ-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 AC857CQ-7 reliable?
The price and inventory of AC857CQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AC857CQ-7 is usually 5 days.
3.What payment methods are accepted for AC857CQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AC857CQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AC857CQ-7?
AC857CQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AC857CQ-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 AC857CQ-7?
For technical support, including AC857CQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AC857CQ-7 requirements.
6.How does Aetrix verify that AC857CQ-7 is sourced from the original manufacturer or authorized distributors?
All AC857CQ-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 AC857CQ-7 meets industry standards.
7.What is the process for return or replacement of AC857CQ-7?
All AC857CQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with AC857CQ-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 AC857CQ-7 part is unused and in its original packaging.
Return procedure for AC857CQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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