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Diodes Incorporated BC846AS-7
- Part No.:
- BC846AS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
BC846AS-7.pdf
- Description:
- TRANS 2NPN 65V 100MA SOT-363
- Quantity:
- Payment:
- Shipping:
Inventory:173,478
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Product details
Overview
BC846AS-7 from Diodes Incorporated is a dual NPN small-signal transistor in SOT363 package, rated for 65 V VCEO, 100 mA IC, and 200 mW power dissipation, with hFE of 110–220 at 2 mA/5 V; used in automotive-grade switching and audio-frequency amplification circuits.
For engineers reviewing the BC846AS-7 datasheet, BC846AS-7 pinout, BC846AS-7 application, or BC846AS-7 equivalent, key selection criteria include breakdown voltage margin (65 V), thermal resistance (625 °C/W), AEC-Q101 qualification, dual-transistor integration in ultra-small SOT363, and complementary PNP pairing with BC856AS.
Technical Context
This dual NPN transistor operates in linear and saturation regions for discrete amplification and digital switching. Its 100 MHz fT supports AF and low-speed digital signal handling, while VCE(SAT) ≤ 250 mV at 10 mA/0.5 mA enables efficient low-loss switching in 3.3 V–5 V logic interfaces.
The device uses a monolithic die with two isolated NPN structures in a single SOT363 leadframe. Thermal performance is defined under JEDEC-standard PCB layout (1 oz copper, single-sided FR-4), and ESD robustness meets HBM Class 3A (4 kV) and MM (400 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 65 V - Maximum safe collector-emitter voltage before avalanche in common-emitter switching |
| IC | 100 mA - Continuous DC collector current limit for reliable operation without thermal runaway |
| hFE | 110–220 - DC current gain range at 2 mA/5 V, enabling predictable base drive sizing |
| fT | 100 MHz - Gain-bandwidth product confirming usable frequency response up to audio and low-speed digital edges |
| RθJA | 625 °C/W - Junction-to-ambient thermal resistance on standard PCB, defining max power derating above 25 °C |
| ESD HBM | 4,000 V - Human Body Model rating supporting robust handling in automated assembly lines |
Pinout & Package
Package: SOT363 - ultra-small surface-mount plastic package with six terminals, 2.15 mm × 2.10 mm footprint, 1.00 mm height, matte tin-plated leads, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter of Transistor 1 | Low-impedance current sink node; tied to ground or bias network in amplifier/switch stages |
| 2 | Base of Transistor 1 | Control input requiring ~0.65 V forward bias; drives 0.5–5 mA base current per switching condition |
| 3 | Collector of Transistor 1 | High-side output node; connects to load or next stage with 65 V standoff capability |
| 4 | Collector of Transistor 2 | Independent high-side output; enables dual-channel operation without cross-coupling |
| 5 | Base of Transistor 2 | Second independent control input; identical biasing requirements as Pin 2 |
| 6 | Emitter of Transistor 2 | Second independent emitter node; may be tied separately or jointly depending on circuit topology |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Ultra-small SOT363 footprint | Enables dual-transistor functionality in < 4.6 mm² board area, critical for space-constrained modules |
| Complementary PNP pair (BC856AS) | Allows matched dual-polarity designs without inter-manufacturer parametric mismatch |
| Lead-free & halogen-free "Green" construction | Meets RoHS 2 and automotive ELV directives; no bromine/chlorine/antimony restrictions violated |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Driving LED indicators and relay coils in door module PCBs with 12 V supply rails. IC Role / Device Role / Timing Role: Discrete NPN switch controlling 50–100 mA loads with fast turn-on/turn-off and low VCE(SAT). Use Value: Dual configuration reduces component count vs. single-transistor solutions; AEC-Q101 ensures reliability over 15-year vehicle life. | Use Scenario: Amplifying low-level thermistor or bridge sensor outputs in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier with stable hFE and low noise at 2 mA bias point. Use Value: 110–220 hFE range allows consistent gain calibration across production batches without trimming. |
| Consumer Audio Pre-amplifier Stage | Medical Diagnostic Equipment Interface |
Use Scenario: Building discrete gain stages in portable ultrasound probe front-end signal chains. IC Role / Device Role / Timing Role: Low-distortion AF amplifier operating at 5 V supply with 100 MHz fT headroom. Use Value: 65 V VCEO provides margin against transient spikes in battery-powered systems. | Use Scenario: Isolating microcontroller GPIOs from external patient-connected sensors in ECG monitor auxiliary ports. IC Role / Device Role / Timing Role: Digital buffer/level shifter with ESD-hardened inputs (4 kV HBM) and galvanic separation. Use Value: Matte tin terminations ensure solder joint integrity during reflow cycles required for medical-grade assembly traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC847BS-7 | Higher hFE (200–450), same VCEO/IC, identical SOT363 package | Better suited for low-base-drive amplification; less ideal for saturated switching where gain variation affects timing | Select when higher DC gain stability at 1–10 mA is prioritized over tight VCE(SAT) control |
| MMDT3904-7 | Same VCEO (60 V), lower hFE (100–300), 200 mW PD, SOT363 | Lower fT (300 MHz typical but not guaranteed min), wider hFE spread, non-AEC-Q101 | Acceptable for industrial/non-automotive use where cost sensitivity outweighs qualification requirements |
Compared with BC846AS-7, BC847BS-7 offers higher gain for precision amplification but reduced consistency in switching transitions, while MMDT3904-7 trades AEC-Q101 compliance and tighter parameter control for broader availability and lower unit cost in non-automotive designs.
Availability
BC846AS-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input stages, and portable medical diagnostic equipment requiring stable component supply with AEC-Q101 assurance.
Supply support for BC846AS-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The BC846AS-7 belongs to Diodes' AEC-Q101-qualified small-signal transistor family, engineered specifically for automotive and industrial applications demanding high reliability, compact packaging, and consistent parametric performance across temperature extremes.
FAQ
What is the maximum continuous collector current for BC846AS-7?
The BC846AS-7 is rated for 100 mA continuous collector current (IC) at TA = +25°C. Derating applies above 25°C per the 625 °C/W thermal resistance; at 85°C ambient, maximum IC drops to approximately 64 mA to maintain junction temperature below 150°C.
Is BC846AS-7 pin-compatible with BC847BS-7?
Yes - both devices use identical SOT363 packaging and share the same pin assignment: E-B-C / C-B-E across the six-terminal layout. No PCB redesign is needed when substituting BC846AS-7 with BC847BS-7, though hFE and VCE(SAT) differences must be verified in circuit simulation.
Does BC846AS-7 support hot-swap or in-circuit programming environments?
No - BC846AS-7 is not designed for hot-swap operation. Its ESD ratings (4 kV HBM, 400 V MM) provide assembly-line robustness but do not guarantee safe insertion into live circuits. External protection (e.g., series resistors, TVS diodes) is required for in-system programming interfaces.
Can BC846AS-7 replace BC846B in SOT23 packages?
No - BC846AS-7 is a dual-transistor SOT363 device, whereas BC846B is a single NPN in SOT23. They differ in pin count, footprint, thermal performance, and functional integration. Direct replacement would require PCB redesign and validation of gain matching, thermal margins, and layout parasitics.
BC846AS-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 NPN (Dual)
- Current - Collector (Ic) (Max):
- 100mA
- Voltage - Collector Emitter Breakdown (Max):
- 65V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 110 @ 2mA, 5V
- Power - Max:
- 200mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
BC846AS-7 FAQ
1.How can I place an order for BC846AS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC846AS-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 BC846AS-7 reliable?
The price and inventory of BC846AS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC846AS-7 is usually 5 days.
3.What payment methods are accepted for BC846AS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846AS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC846AS-7?
BC846AS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC846AS-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 BC846AS-7?
For technical support, including BC846AS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846AS-7 requirements.
6.How does Aetrix verify that BC846AS-7 is sourced from the original manufacturer or authorized distributors?
All BC846AS-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 BC846AS-7 meets industry standards.
7.What is the process for return or replacement of BC846AS-7?
All BC846AS-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC846AS-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 BC846AS-7 part is unused and in its original packaging.
Return procedure for BC846AS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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