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Diodes Incorporated BC847AT-7
- Part No.:
- BC847AT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SOT-523
- Datasheet:
-
BC847AT-7.pdf
- Description:
- TRANS NPN 45V 0.1A SOT-523
- Quantity:
- Payment:
- Shipping:
Inventory:554
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Product details
Overview
BC847AT-7 from Diodes Incorporated is a 45V NPN small-signal transistor in SOT523 package, rated for 100mA collector current, with minimum hFE of 110 at 2mA/5V, VCE(sat) ≤ 250mV at 10mA/0.5mA drive, and fT = 100MHz - used in low-power switching and amplification stages of portable sensor interfaces and LED driver bias circuits.
For engineers reviewing the BC847AT-7 datasheet, BC847AT-7 pinout, BC847AT-7 application, or BC847AT-7 equivalent, key selection criteria include VCEO = 45V, hFE binning (A-grade), ultra-small SOT523 footprint, thermal resistance of 833°C/W, and automotive-compliant variant availability (BC847BTQ).
Technical Context
This NPN bipolar junction transistor employs epitaxial planar die construction for stable gain and low leakage. Its 45V VCEO and 6V VEBO support operation in 3.3V–24V rail systems with margin for transient spikes.
Designed for surface-mount use in space-constrained applications, it delivers 100MHz fT at 10mA/5V and maintains hFE ≥ 110 across –55°C to +150°C operating range, with ESD HBM rating of 4kV for robust handling in automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - supports 24V system rails with 88% voltage headroom before breakdown |
| IC | 100 mA - sufficient for driving LEDs, small relays, or logic-level signal buffering |
| hFE (min) | 110 @ 2mA/5V - ensures reliable saturation with low base drive in discrete switch designs |
| fT | 100 MHz - enables audio-frequency amplification and fast digital switching up to ~10MHz |
| RθJA | 833 °C/W - requires minimal PCB copper area for thermal management in low-duty-cycle apps |
| ESD HBM | 4,000 V - withstands standard handling without additional protection circuitry |
Pinout & Package
Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 0.80 × 0.50 mm), weight 0.002 g, moisture sensitivity level 1, RoHS-compliant matte tin-plated terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; lowest impedance node in common-emitter configuration |
| 2 (Base) | Control input | Receives current-limited drive (e.g., via 10kΩ resistor); controls collector current linearly or in saturation |
| 3 (Collector) | Current source terminal | Connected to load and positive supply; carries full switched current with VCE(sat) ≤ 250mV at rated IC |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die construction | Ensures consistent hFE distribution and low leakage (<5nA at 150°C) across temperature |
| Ultra-small SOT523 footprint | Reduces board area by >50% vs. SOT23; compatible with high-density 0.5mm-pitch routing |
| A-grade hFE bin (110–220) | Enables predictable base drive design without over-sizing resistors or adding gain compensation |
| Lead-free & halogen-free "Green" compliance | Meets IPC-J-STD-020 Level 1 MSL and EU RoHS 3 (2015/863/EU) without derating penalties |
Applications
| Portable Sensor Signal Conditioning | Low-Voltage LED Bias Control |
|---|---|
Use Scenario: Amplifying microamp-level output from ambient light or temperature sensors in battery-powered wearables. IC Role / Device Role / Timing Role: NPN amplifier in common-emitter configuration with emitter degeneration for DC stability. Use Value: 100MHz fT preserves signal integrity up to 10kHz bandwidth; 110 hFE min ensures gain stability across temperature without feedback trimming. | Use Scenario: Switching indicator LEDs in USB-C power delivery dongles with 3.3V/5V logic control. IC Role / Device Role / Timing Role: Low-side saturated switch driven by MCU GPIO with 0.5mA base current. Use Value: VCE(sat) ≤ 250mV at 10mA reduces power loss to <2.5mW; SOT523 footprint saves >0.8mm² per channel vs. SOT23. |
| Automotive Body Control Subsystems | Industrial I/O Module Input Protection |
Use Scenario: Driving small solenoids or status indicators in AEC-Q101-qualified body control modules (using BC847BTQ variant). IC Role / Device Role / Timing Role: Interface buffer between 5V CAN transceiver logic and 12V load circuits. Use Value: 45V VCEO accommodates load-dump transients up to 35V; 4kV HBM protects against assembly ESD events. | Use Scenario: Discrete input conditioning stage for 24V industrial PLC digital inputs with optocoupler isolation. IC Role / Device Role / Timing Role: Current-limiting pre-bias transistor ahead of optocoupler LED anode. Use Value: 100mA IC rating allows safe operation with 10mA input current; 6V VEBO prevents reverse-base breakdown during negative transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT3904-7-F | VCEO = 40V, hFE min = 100 (same SOT523, same manufacturer) | Slightly lower voltage margin; identical pinout and thermal profile | Select when 40V rating suffices and cost optimization is prioritized over 45V headroom |
| BC847B-7-F | hFE bin = 200–450 (B-grade), otherwise identical specs and package | Higher gain enables reduced base drive current in linear amplifiers | Choose for analog gain stages requiring tighter hFE consistency or lower base current consumption |
Compared with MMBT3904-7-F, BC847AT-7 offers +5V higher VCEO headroom critical in 24V industrial systems; versus BC847B-7-F, its A-grade hFE provides more conservative, predictable switching behavior with less sensitivity to process variation.
Availability
BC847AT-7 is available at Aetrix Electronics and suitable for portable sensor interfaces, low-voltage LED bias control, and industrial I/O module input protection requiring stable component supply and long-term obsolescence management.
Supply support for BC847AT-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 and manufacturing operations across Asia and the Americas.
The BC847x series belongs to Diodes' small-signal transistor product line, engineered for high-reliability, space-constrained applications in consumer, industrial, and automotive electronics where consistent gain, low saturation voltage, and compact packaging are essential.
FAQ
Is BC847AT-7 pin-compatible with BC847B-7-F and BC847C-7-F?
Yes - all three variants share identical SOT523 package, pinout (Emitter-Base-Collector), and mechanical dimensions. Only hFE binning differs: A (110–220), B (200–450), and C (420–800). No layout change is required when substituting within the same family.
What is the maximum continuous power dissipation for BC847AT-7 on a standard PCB?
The rated power dissipation is 150 mW under JEDEC-standard test conditions: 1 oz copper, single-sided 1.6 mm FR-4 board, still air. Derating begins above +25°C at 0.18 mW/°C, reaching zero at +150°C ambient - actual usable power depends on local copper area and airflow.
Does BC847AT-7 meet automotive qualification standards?
No - BC847AT-7 is not AEC-Q101 qualified. For automotive applications, Diodes offers the BC847BTQ variant, which undergoes stress testing per AEC-Q101 and is documented in a separate datasheet (DS30274Q). Standard BC847AT-7 is intended for commercial/industrial use.
Can BC847AT-7 replace MMBT3904 in existing designs?
Yes, with verification of voltage margin: BC847AT-7 has 45V VCEO vs. MMBT3904's 40V, offering +5V headroom. Both use SOT523, same pinout, and comparable hFE/VCE(sat). Confirm that 110 min hFE meets your base drive budget, especially at elevated temperatures.
BC847AT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 110 @ 2mA, 5V
- Power - Max:
- 150 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-523
BC847AT-7 FAQ
1.How can I place an order for BC847AT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC847AT-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 BC847AT-7 reliable?
The price and inventory of BC847AT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847AT-7 is usually 5 days.
3.What payment methods are accepted for BC847AT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847AT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC847AT-7?
BC847AT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC847AT-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 BC847AT-7?
For technical support, including BC847AT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847AT-7 requirements.
6.How does Aetrix verify that BC847AT-7 is sourced from the original manufacturer or authorized distributors?
All BC847AT-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 BC847AT-7 meets industry standards.
7.What is the process for return or replacement of BC847AT-7?
All BC847AT-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC847AT-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 BC847AT-7 part is unused and in its original packaging.
Return procedure for BC847AT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC847AT-7 Tags
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MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
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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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