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Diodes Incorporated BC847AT-7-F
- Part No.:
- BC847AT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SOT-523
- Datasheet:
-
BC847AT-7-F.pdf
- Description:
- TRANS NPN 45V 0.1A SOT-523
- Quantity:
- Payment:
- Shipping:
Inventory:584,492
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Product details
Overview
BC847AT-7-F 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, and fT = 100MHz - used in low-power switching and amplification stages of portable sensor interfaces and LED driver bias networks.
For engineers reviewing the BC847AT-7-F datasheet, BC847AT-7-F pinout, BC847AT-7-F application, or BC847AT-7-F equivalent, key selection criteria include VCEO = 45V, hFE binning (A-grade), SOT523 thermal resistance (RθJA = 833°C/W), ESD HBM rating (4kV), and RoHS/Green compliance status.
Technical Context
This NPN bipolar junction transistor uses 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 against transients.
Designed for ultra-compact PCB layouts, it delivers 100MHz fT at 10mA/5V while maintaining VCE(sat) ≤ 250mV under light drive (IB/IC = 1:20), enabling efficient low-side switch control in space-constrained IoT endpoints.
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, relays, or logic-level MOSFET gates in portable devices |
| hFE (min) | 110 @ 2mA/5V - ensures reliable saturation with base resistors ≥10kΩ from 3.3V MCU GPIOs |
| VCE(sat) | ≤250 mV @ 10mA/0.5mA - limits power loss to <2.5mW in switching mode, reducing thermal load |
| fT | 100 MHz - enables use in audio preamps and RF detector stages up to ~10MHz bandwidth |
| RθJA | 833 °C/W - requires minimal copper area (single-sided 1oz FR-4) for safe 150mW operation |
| ESD HBM | 4,000 V - withstands handling without external protection in assembly environments |
Pinout & Package
Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 0.80 × 0.55 mm), weight 0.002 g, moisture sensitivity level 1, UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-impedance return; sets reference for VBE and IC control |
| 2 (Base) | Control input | Receives current-limited drive (e.g., via 10kΩ resistor) to modulate collector current linearly or in saturation |
| 3 (Collector) | Current source terminal | Supplies switched load current; routed to VCC or pull-up network; thermally coupled to PCB pad for dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die | Ensures tight hFE distribution and low ICBO (<15nA), critical for battery-operated sensor bias stability |
| SOT523 footprint | Reduces board area by >50% vs. SOT23, enabling high-density routing in wearables and compact modules |
| A-grade hFE bin (110–220) | Guarantees predictable base drive requirements across production lots without design iteration |
| Halogen & antimony free | Meets IPC-1752A Class 2 reporting requirements and automotive ELV Directive compliance |
Applications
| LED Driver Biasing | Low-Voltage Switching |
|---|---|
Use Scenario: Driving indicator LEDs from 3.3V microcontroller GPIOs in medical handheld devices. IC Role / Device Role / Timing Role: NPN switch providing current sink path with controlled saturation to limit LED current to 5–10mA. Use Value: VCE(sat) ≤250mV ensures >95% efficiency in LED power delivery and eliminates need for heat-spreading copper. | Use Scenario: Enabling/disabling 5V power rails for peripheral sensors in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-side load switch controlling VCC to analog front-end ICs during sleep/wake cycles. Use Value: 100mA IC rating and 45V VCEO allow safe operation across 3.3V/5V domains with transient immunity. |
| Audio Signal Amplification | Signal Level Translation |
Use Scenario: Building discrete preamplifier stages for MEMS microphone outputs in voice-activated edge nodes. IC Role / Device Role / Timing Role: Common-emitter amplifier biased at 2mA for 100MHz fT-limited gain-bandwidth product. Use Value: hFE ≥110 and NF ≤4dB at 1MHz enable SNR-preserving amplification without op-amp complexity. | Use Scenario: Translating 1.8V logic signals to 3.3V levels for interfacing ultra-low-power MCUs with legacy peripherals. IC Role / Device Role / Timing Role: Active pull-up translator using emitter-follower configuration with fixed VBE offset. Use Value: 6V VEBO rating prevents reverse-bias damage during level-shifting transitions and ensures robustness over temperature. |
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 |
|---|---|---|---|
| MMBT3904LT1G | VCEO = 40V (5V lower); hFE min = 100; SOT23 package (larger footprint) | Not suitable where 45V margin or SOT523 size is mandatory; acceptable in non-space-constrained 3.3V logic buffers | Select only if board layout allows SOT23 and system transients stay below 40V. |
| BC847B-7-F | Same package and pinout; hFE bin = 200–450 (higher gain, wider spread) | Requires recalculation of base resistor values; may cause overdrive in low-current bias networks | Prefer when higher gain is needed and tighter hFE tolerance is not required for stability. |
Compared with MMBT3904LT1G, BC847AT-7-F offers +5V breakdown margin and 40% smaller footprint; versus BC847B-7-F, it provides tighter hFE control for deterministic base drive in battery-sensitive designs.
Availability
BC847AT-7-F is available at Aetrix Electronics and suitable for LED driver biasing, low-voltage switching, and audio signal amplification requiring stable component supply, consistent hFE binning, and ultra-compact packaging.
Supply support for BC847AT-7-F 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 BC847 series belongs to Diodes' small-signal transistor portfolio, engineered for high-reliability, space-constrained applications in consumer, industrial, and automotive electronics where consistent gain, low saturation voltage, and green compliance are essential.
FAQ
What is the maximum continuous collector current for BC847AT-7-F?
The absolute maximum continuous collector current is 100mA at TA = +25°C. Derating applies above 25°C per the datasheet's thermal curve: at 85°C ambient, max IC drops to ~65mA due to RθJA = 833°C/W and PD = 150mW limit. Operation beyond this risks thermal runaway in unventilated enclosures.
Is BC847AT-7-F suitable for automotive applications?
No - BC847AT-7-F is not AEC-Q101 qualified. Diodes offers the automotive-compliant variant BC847BTQ (with Q suffix) under a separate datasheet, which includes extended temperature testing (−40°C to +150°C), enhanced ESD robustness, and PPAP documentation. Use BC847AT-7-F only in commercial/industrial environments.
How does the SOT523 package affect thermal performance compared to SOT23?
SOT523 has higher RθJA (833°C/W) than SOT23 (~400°C/W) due to reduced pad area and thinner mold compound. This means 150mW power dissipation raises junction temperature ~125°C above ambient - requiring careful layout with thermal vias or adjacent copper pours to maintain TJ < 150°C in sustained operation.
What marking code identifies BC847AT-7-F on the device body?
The top-marking code is "1E", laser-etched on the package surface. This corresponds to the BC847AT grade (hFE = 110–220) per Diodes' standard marking scheme. The date code (e.g., "K9" for September 2023) appears adjacent but is not part of the part identification.
BC847AT-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-F FAQ
1.How can I place an order for BC847AT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BC847AT-7-F 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-F reliable?
The price and inventory of BC847AT-7-F 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-F is usually 5 days.
3.What payment methods are accepted for BC847AT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847AT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC847AT-7-F?
BC847AT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC847AT-7-F 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-F?
For technical support, including BC847AT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847AT-7-F requirements.
6.How does Aetrix verify that BC847AT-7-F is sourced from the original manufacturer or authorized distributors?
All BC847AT-7-F 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-F meets industry standards.
7.What is the process for return or replacement of BC847AT-7-F?
All BC847AT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC847AT-7-F, 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-F part is unused and in its original packaging.
Return procedure for BC847AT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC847AT-7-F Tags
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