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Diodes Incorporated AC857BQ-7
- Part No.:
- AC857BQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AC857BQ-7.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,749
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Product details
Overview
AC857BQ-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 = 220–475 at IC = −2 mA, designed for automotive switching and audio-frequency amplifier applications.
For engineers reviewing the AC857BQ-7 datasheet, AC857BQ-7 pinout, AC857BQ-7 application, or AC857BQ-7 equivalent, this part supports AEC-Q101 qualified designs requiring robust thermal performance (RθJA = 403 °C/W), low-noise operation (NF = 2–10 dB), and high fT = 100–200 MHz under pulsed conditions.
Technical Context
This PNP BJT operates with emitter-grounded configuration and exhibits DC current gain hFE that varies from 220 to 475 at −2 mA collector current and −5 V VCE, while maintaining VCE(sat) ≤ −300 mV at −10 mA/−0.5 mA drive. Its transition frequency reaches 200 MHz under −5 V VCE, −10 mA IC, enabling use in medium-speed switching and AF amplification.
The device features low base-emitter turn-on voltage (VBE(on) = −600 to −750 mV at −2 mA), tight parameter spread between AC857BQ and AC857CQ variants, and is characterized under pulsed test conditions (≤300 µs pulse width, ≤2% duty cycle) to ensure stability across temperature (−65 to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (cont.) | −100 mA - Continuous collector current limit defining steady-state power handling capability. |
| hFE | 220–475 - DC current gain range at −2 mA IC, −5 V VCE; determines base drive requirements. |
| fT | 100–200 MHz - Gain-bandwidth product indicating usable frequency limit for small-signal amplification. |
| NF | 2–10 dB - Noise figure at 1 kHz, 2 kΩ source resistance; critical for low-noise preamplifier stages. |
| RθJA | 403 °C/W - Junction-to-ambient thermal resistance on minimal FR-4 pad layout; defines self-heating under load. |
| ESD HBM | 4,000 V - Human Body Model ESD rating per JEDEC JESD22-A114; ensures robustness during handling. |
Pinout & Package
Package: SOT23 - surface-mount plastic package with 3 terminals, 0.008 g mass, UL 94V-0 flammability rating, and matte tin-plated leads solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current sink terminal; connected to ground or lower potential in PNP switching/amplifier configurations. |
| 2 (Base) | B | Control input; requires negative bias relative to emitter to forward-bias base-emitter junction. |
| 3 (Collector) | C | Current source terminal; delivers amplified output current to load when saturated or active. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per AEC standard. |
| IATF 16949 manufacturing | Produced in certified facilities with PPAP capability, ensuring traceable process control and change management for OEM programs. |
| Green, halogen-free construction | Contains <900 ppm Br, <900 ppm Cl (<1500 ppm total Br+Cl), <1000 ppm Sb; compliant with RoHS 3 and automotive environmental mandates. |
| SOT23 footprint compatibility | Standardized 3-pin outline (2.9 mm × 1.3 mm × 1.0 mm) enables drop-in replacement and automated placement in space-constrained PCBs. |
Applications
| Automotive Door Module Control | Infotainment System Audio Preamp |
|---|---|
Use Scenario: Driving window lift motor relays and LED status indicators in door control units. IC Role / Device Role / Timing Role: PNP switch controlling 12 V loads with <−300 mV saturation voltage at −10 mA drive. Use Value: Low VCE(sat) minimizes power loss and heat generation in thermally constrained modules. |
Use Scenario: Low-noise voltage amplification stage for microphone or line-level inputs in head unit front-end. IC Role / Device Role / Timing Role: Small-signal PNP amplifier with NF = 2–10 dB and fT = 100–200 MHz. Use Value: High hFE and stable gain across −50 to +150 °C enable consistent audio fidelity in cabin environments. |
| Body Control Unit (BCU) Signal Conditioning | LED Driver for Interior Lighting |
Use Scenario: Level-shifting and signal inversion of sensor outputs (e.g., door ajar, seatbelt) before MCU input. IC Role / Device Role / Timing Role: Inverting switch with −45 V VCEO and −5 V VEBO tolerance for 12 V system interfacing. Use Value: Robust breakdown ratings prevent latch-up or damage during load dump transients. |
Use Scenario: Constant-current sink for white LEDs in map lights and ambient lighting circuits. IC Role / Device Role / Timing Role: Linear-mode PNP current regulator with precise hFE control over IC. Use Value: Tight hFE binning (AC857BQ vs. AC857CQ) allows predictable current setting without external feedback. |
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 |
|---|---|---|---|
| BC857B,215 (Nexperia) | Same SOT23 package; hFE = 200–450 at −2 mA, VCEO = −45 V, but not AEC-Q101 qualified. | Lacks automotive qualification and PPAP support; suitable only for industrial/commercial designs. | Select when AEC-Q101 compliance is not required and cost sensitivity outweighs qualification needs. |
| MMBT857LT1G (onsemi) | Same VCEO/IC ratings; hFE = 250–600 at −2 mA; AEC-Q101 qualified but RθJA = 450 °C/W (higher thermal resistance). | Higher thermal resistance limits power dissipation in compact layouts without enhanced copper pour. | Prefer when wider hFE spread is acceptable and board-level thermal design accommodates higher RθJA. |
Compared with BC857B,215 and MMBT857LT1G, AC857BQ-7 uniquely combines AEC-Q101 qualification, IATF 16949 manufacturing, and optimized thermal resistance (403 °C/W) for automotive PCBs with limited copper area-making it the preferred choice where functional safety and supply chain traceability are mandatory.
Availability
AC857BQ-7 is available at Aetrix Electronics and suitable for automotive door modules, infotainment preamplifiers, and body control unit signal conditioning requiring stable component supply, long-term lifecycle assurance, and full AEC-Q101 compliance.
Supply support for AC857BQ-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The AC857 series belongs to Diodes' automotive-qualified small-signal transistor portfolio, engineered specifically for reliable switching and amplification in harsh-temperature, high-reliability vehicle subsystems.
FAQ
What is the maximum operating temperature for AC857BQ-7?
The AC857BQ-7 is rated for junction and storage temperatures from −65 °C to +150 °C. Its thermal resistance (RθJA = 403 °C/W on minimal FR-4 pad) means that at 100 mW dissipation, junction temperature rise above ambient is ~40 °C-ensuring safe operation up to +110 °C ambient in properly laid-out automotive PCBs.
Is AC857BQ-7 pin-compatible with NPN counterparts like AC847BQ-7?
Yes-AC857BQ-7 (PNP) and AC847BQ-7 (NPN) share identical SOT23 package dimensions and pinout (Emitter-Base-Collector), enabling complementary pair usage in push-pull or differential amplifier designs without layout changes.
Does AC857BQ-7 require derating above 25°C ambient?
Yes-its maximum power dissipation decreases linearly above +25 °C: PD drops from 310 mW at 25 °C to zero at 150 °C, following a derating slope of −2.07 mW/°C. This must be applied in thermal design for sustained operation in engine bay or dashboard environments.
How does the AC857BQ differ from AC857CQ in practical circuit design?
AC857BQ specifies hFE = 220–475 and hie = 4.5 kΩ, while AC857CQ offers hFE = 420–800 and hie = 8.7 kΩ at same test conditions. Designers select AC857BQ for tighter gain control in switching, and AC857CQ for higher gain in low-current amplification where base drive is constrained.
AC857BQ-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:
- 220 @ 2mA, 5V
- Power - Max:
- 350 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AC857BQ-7 FAQ
1.How can I place an order for AC857BQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AC857BQ-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 AC857BQ-7 reliable?
The price and inventory of AC857BQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AC857BQ-7 is usually 5 days.
3.What payment methods are accepted for AC857BQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AC857BQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AC857BQ-7?
AC857BQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AC857BQ-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 AC857BQ-7?
For technical support, including AC857BQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AC857BQ-7 requirements.
6.How does Aetrix verify that AC857BQ-7 is sourced from the original manufacturer or authorized distributors?
All AC857BQ-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 AC857BQ-7 meets industry standards.
7.What is the process for return or replacement of AC857BQ-7?
All AC857BQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with AC857BQ-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 AC857BQ-7 part is unused and in its original packaging.
Return procedure for AC857BQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AC857BQ-7 Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
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