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Diodes Incorporated AC857BSQ-7
- Part No.:
- AC857BSQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
AC857BSQ-7.pdf
- Description:
- TRANS 2PNP DUAL SOT-363
- Quantity:
- Payment:
- Shipping:
Inventory:997
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Product details
Overview
AC857BSQ-7 from Diodes Incorporated is a dual PNP small-signal bipolar junction transistor (BJT) in SOT363 package, rated for -45 V VCEO, -100 mA IC, and 220–475 hFE at -2 mA/-5 V; qualified to AEC-Q101 and used in automotive switching and audio-frequency amplifier stages.
For engineers reviewing the AC857BSQ-7 datasheet, AC857BSQ-7 pinout, AC857BSQ-7 application, or AC857BSQ-7 equivalent, key selection criteria include its dual-PNP configuration, -45 V breakdown rating, AEC-Q101 qualification, low VCE(SAT) (-100 mV typ. @ -10 mA/-0.5 mA), and SOT363 footprint compatibility with high-density automotive PCB layouts.
Technical Context
This dual PNP transistor integrates two matched silicon BJTs in a single ultra-small surface-mount package, enabling compact complementary or push-pull configurations without discrete pairing. Its -50 V VCBO and -5 V VEBO support robust biasing in negative-rail circuits, while fT = 100 MHz ensures stable operation up to mid-audio frequencies.
The device operates across -55°C to +150°C, with thermal resistance RθJA = 625°C/W on standard FR-4 layout, and delivers consistent hFE performance from -0.1 mA to -100 mA collector current-critical for linear amplification and saturated switching in engine control modules and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -45 V - Maximum safe collector-emitter voltage under open-base conditions in automotive power rails |
| IC | -100 mA - Continuous DC collector current handling for signal-level switching and pre-amplifier loads |
| hFE | 220–475 - DC current gain range at -2 mA/-5 V, enabling predictable bias design in linear and switching modes |
| VCE(SAT) | -100 mV (typ.) @ -10 mA/-0.5 mA - Low saturation voltage reduces conduction loss in active-low logic interfaces |
| fT | 100 MHz - Gain-bandwidth product supporting stable AF amplification up to ~10 kHz with margin |
| PD | 200 mW - Power dissipation limit on standard FR-4 PCB, defining thermal derating above 25°C ambient |
| RθJA | 625°C/W - Junction-to-ambient thermal resistance, guiding heatsinking requirements in enclosed modules |
Pinout & Package
SOT363 is a 6-pin, ultra-compact, lead-free plastic surface-mount package with matte tin terminals, UL 94V-0 flammability rating, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B1 | Base of Transistor 1 | Control input for first PNP emitter-follower or switch stage |
| C1 | Collector of Transistor 1 | Current sink node for first transistor; connected to negative supply rail in common-emitter config |
| E1 | Emitter of Transistor 1 | Output or reference node for first transistor; tied to load or bias network |
| B2 | Base of Transistor 2 | Independent control input enabling dual-channel operation without cross-coupling |
| C2 | Collector of Transistor 2 | Second current sink node; supports mirrored or complementary circuit topologies |
| E2 | Emitter of Transistor 2 | Second output node; allows push-pull, differential pair, or redundant switching functions |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive underhood and cabin applications including temperature cycling and HTRB stress |
| SOT363 footprint | 0.65 mm pitch, 2.15 × 2.10 mm outline-enables high-density placement in space-constrained ECUs |
| Matched dual PNP structure | Monolithic integration ensures consistent hFE, VBE(ON), and thermal tracking between transistors |
| Green compound & RoHS compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental mandates |
Applications
| Engine Control Unit (ECU) Signal Conditioning | Automotive Body Control Module (BCM) Switching |
|---|---|
Use Scenario: Amplifying sensor signals (e.g., throttle position, coolant temp) before ADC sampling in engine management systems. IC Role / Device Role / Timing Role: Dual PNP configured as cascode or differential pair to reject noise and stabilize DC bias over temperature. Use Value: 220–475 hFE and -55°C to +150°C operation ensure accurate analog front-end gain stability across full vehicle operating range. | Use Scenario: Driving LED indicators, relays, or solenoids in door modules, lighting controls, and seat actuation circuits. IC Role / Device Role / Timing Role: Saturated-switch mode operation with -100 mV VCE(SAT) minimizes power loss and heat generation in 12 V automotive systems. Use Value: Dual configuration enables independent control of two loads from one footprint, reducing BOM count and PCB area vs. discrete transistors. |
| Infotainment Audio Pre-Amplifier Stage | Powertrain Diagnostic Interface Circuit |
Use Scenario: Low-noise amplification of microphone or tuner IF signals prior to DSP processing in head units. IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration, leveraging 100 MHz fT for flat response up to 10 kHz. Use Value: Matched hFE and VBE(ON) between transistors simplifies balanced stage design and improves THD performance. | Use Scenario: Level-shifting and isolation of CAN or LIN bus diagnostic signals between microcontroller and external test equipment. IC Role / Device Role / Timing Role: Active pull-down stage converting 3.3 V logic to -12 V compatible interface, using PNP emitter-follower topology. Use Value: -45 V VCEO and -50 V VCBO provide margin against load-dump transients and battery reverse-connection events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN3026LSD-13 | Single N-channel MOSFET (not bipolar); 30 V VDS, 2.6 A ID; no hFE or VBE parameters | Not suitable for linear amplification; only viable for high-current switching where gate drive is available | Select only when replacing saturated-switch function with logic-level MOSFET drive and higher current capability is required |
| BC847BDW1T1G | Dual NPN in SOT363; +45 V VCEO, +100 mA IC, hFE 200–450; complementary polarity | Requires inverted biasing and signal polarity handling; unsuitable for direct PNP replacement in negative-rail circuits | Use only in new designs where NPN topology is acceptable and system-level signal inversion can be accommodated |
Compared with AC857BSQ-7, DMN3026LSD-13 offers higher current but lacks linear gain and automotive qualification, while BC847BDW1T1G provides matching package and gain but opposite polarity-neither serves as drop-in replacement without circuit redesign.
Availability
AC857BSQ-7 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, infotainment audio stages, and powertrain diagnostic interfaces requiring stable component supply with AEC-Q101 assurance.
Supply support for AC857BSQ-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, specializing in high-reliability components for automotive, industrial, and consumer markets.
The AC857BSQ belongs to Diodes' AEC-Q101-qualified small-signal transistor product line, engineered specifically for automotive signal conditioning, switching, and amplification in harsh-temperature environments.
FAQ
Is AC857BSQ-7 suitable for linear amplification applications?
Yes. With hFE of 220–475 at -2 mA/-5 V and fT = 100 MHz, it supports stable audio-frequency amplification in common-emitter or emitter-follower configurations. Its matched dual structure also enables differential pair designs with tight gain tracking across temperature.
What is the maximum operating temperature for AC857BSQ-7?
The AC857BSQ-7 is rated for continuous operation from -55°C to +150°C junction temperature. This range is validated per AEC-Q101 stress testing and applies to both switching and linear modes when thermal design respects the 625°C/W RθJA limit on standard FR-4 PCBs.
Does AC857BSQ-7 have lead-free and halogen-free certification?
Yes. It is fully RoHS-compliant (2011/65/EU), lead-free, and halogen- and antimony-free ("Green"), with bromine and chlorine each below 900 ppm and total Br+Cl <1500 ppm, verified per Diodes Incorporated's material declarations and JESD22-A112 testing.
Can AC857BSQ-7 replace a single discrete PNP transistor in existing designs?
No-it contains two independent PNP transistors in one SOT363 package. Replacing a single transistor requires either using only one half (with unused pins left unconnected) or redesigning for dual functionality. Pin assignments must be verified against the top-view diagram to avoid misconnection of B1/C1/E1 vs. B2/C2/E2.
AC857BSQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- 2 PNP (Dual)
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- -
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
AC857BSQ-7 FAQ
1.How can I place an order for AC857BSQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AC857BSQ-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 AC857BSQ-7 reliable?
The price and inventory of AC857BSQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AC857BSQ-7 is usually 5 days.
3.What payment methods are accepted for AC857BSQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AC857BSQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AC857BSQ-7?
AC857BSQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AC857BSQ-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 AC857BSQ-7?
For technical support, including AC857BSQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AC857BSQ-7 requirements.
6.How does Aetrix verify that AC857BSQ-7 is sourced from the original manufacturer or authorized distributors?
All AC857BSQ-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 AC857BSQ-7 meets industry standards.
7.What is the process for return or replacement of AC857BSQ-7?
All AC857BSQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with AC857BSQ-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 AC857BSQ-7 part is unused and in its original packaging.
Return procedure for AC857BSQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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