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Diodes Incorporated BC847BT-7
- Part No.:
- BC847BT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SOT-523
- Datasheet:
-
BC847BT-7.pdf
- Description:
- TRANS NPN 45V 0.1A SOT-523
- Quantity:
- Payment:
- Shipping:
Inventory:6,281
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Product details
Overview
BC847BT-7 from Diodes Incorporated is a 45V NPN small-signal transistor in SOT523 package, rated for 100mA collector current, with minimum hFE of 220 at IC = 2mA and VCE = 5V, VCE(sat) ≤ 600mV at IC = 100mA/IB = 5mA, and fT = 100MHz - used in low-power switching and amplification stages of portable power management and signal conditioning circuits.
For engineers reviewing the BC847BT-7 datasheet, BC847BT-7 pinout, BC847BT-7 application, or BC847BT-7 equivalent, key selection criteria include its SOT523 footprint compatibility, guaranteed hFE bin (B-grade), thermal resistance (RθJA = 833°C/W), ESD robustness (HBM 4kV), and automotive-compliant variant availability (BC847BTQ).
Technical Context
This NPN bipolar junction transistor uses epitaxial planar die construction for stable gain and low leakage. It operates across –55°C to +150°C with VCEO = 45V, VCB0 = 50V, and VEB0 = 6V - enabling use in bias networks, level-shifting interfaces, and discrete amplifier loads where low saturation voltage and predictable DC gain are required.
Its 100MHz fT supports audio-frequency amplification and moderate-speed digital switching (e.g., <5MHz logic buffering). The device's 150mW power dissipation and 833°C/W junction-to-ambient thermal resistance reflect its ultra-small SOT523 package constraints - requiring minimal PCB copper area for thermal relief.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum allowable collector-emitter voltage before breakdown; sets upper rail limit in low-voltage switching applications. |
| IC | 100 mA - Continuous collector current rating; defines maximum load drive capability in active or saturated operation. |
| hFE (min) | 220 - Minimum DC current gain at IC = 2mA, VCE = 5V; ensures reliable base drive margin in linear amplifiers and switch drivers. |
| VCE(sat) | 600 mV max at IC = 100mA/IB = 5mA - Low saturation voltage reduces conduction loss in high-duty-cycle switching. |
| fT | 100 MHz - Transition frequency; supports audio amplification and sub-10MHz digital signal routing without gain roll-off. |
| RθJA | 833 °C/W - Junction-to-ambient thermal resistance on standard 1oz FR-4; dictates derating above 25°C ambient. |
| ESD HBM | 4,000 V - Human Body Model rating; allows safe handling in non-ESD-controlled assembly environments. |
Pinout & Package
Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.90 mm), weight ≈ 0.002 g, moisture sensitivity level 1 per J-STD-020, matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or lower-potential node; determines current path direction in common-emitter configuration. |
| 2 (Base) | Control input | Receives bias current to regulate collector current; requires series resistor to limit IB and prevent thermal runaway. |
| 3 (Collector) | Current source terminal | Drives load toward supply rail; layout must minimize trace inductance for high-frequency stability. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed hFE bin (B-grade) | 220–450 at IC = 2mA/VCE = 5V - enables consistent gain matching in multi-stage amplifiers without post-production sorting. |
| Ultra-small SOT523 footprint | 1.6 × 1.6 mm outline - saves >60% board area vs. SOT23, critical for space-constrained wearables and sensor modules. |
| High ESD robustness | HBM 4kV / MM 400V - eliminates need for external ESD protection in front-end interface circuits. |
| Automotive-qualified variant | BC847BTQ available - AEC-Q101 qualified for under-hood and infotainment subsystems requiring extended temperature and reliability validation. |
Applications
| Portable Power Sequencing | Low-Voltage Signal Amplification |
|---|---|
Use Scenario: Enabling/disabling auxiliary rails (e.g., display backlight, sensor bias) in battery-powered IoT nodes using MCU GPIO control. IC Role / Device Role / Timing Role: NPN switch operating in saturation mode, driven by 3.3V logic with base resistor limiting IB to 5mA. Use Value: VCE(sat) ≤ 600mV ensures <2mW conduction loss at 100mA load, extending battery life in duty-cycled operation. | Use Scenario: Pre-amplifying weak analog signals (e.g., microphone output, thermistor bridge) before ADC sampling in medical sensors. IC Role / Device Role / Timing Role: Common-emitter amplifier biased at IC = 2mA, delivering ≥220× voltage gain with fT-limited bandwidth up to 100kHz. Use Value: Guaranteed hFE bin minimizes gain variation across production units, reducing calibration overhead in volume manufacturing. |
| Level-Shifting Interface | LED Driver for Indicator Circuits |
Use Scenario: Translating 1.8V logic outputs to 5V-compatible inputs in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Common-base configuration with emitter tied to 1.8V domain and collector pulled to 5V, providing unidirectional voltage translation. Use Value: VEB0 = 6V withstands reverse-biased emitter-base junction during level transitions, preventing latch-up. | Use Scenario: Driving status LEDs (20mA typical) from 3.3V/5V microcontroller pins in industrial HMIs and test equipment. IC Role / Device Role / Timing Role: Low-side switch with base driven via 1kΩ resistor, operating in saturation to minimize LED forward voltage drop impact. Use Value: 100mA IC rating supports burst-mode LED flashing at 2x nominal current without degradation. |
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 | Same SOT-23 package; hFE min = 100 (lower gain bin); RθJA = 300°C/W (higher thermal mass) | Less suitable for space-constrained layouts; requires larger copper pour for equivalent thermal performance | Select when cost sensitivity outweighs board area and gain consistency requirements |
| BC847BW | SOT-323 package (larger than SOT523); identical electrical specs but different marking and tape/reel packaging | Not footprint-compatible; requires PCB redesign despite functional equivalence | Choose only if SOT-323 is already standardized in existing design libraries |
Compared with MMBT3904LT1G and BC847BW, BC847BT-7 offers superior board-area efficiency and tighter hFE distribution - making it optimal for miniaturized, gain-critical designs where thermal headroom is managed via layout rather than package size.
Availability
BC847BT-7 is available at Aetrix Electronics and suitable for portable power sequencing, low-voltage signal amplification, level-shifting interfaces, and LED indicator circuits requiring stable component supply across high-mix, low-volume production runs.
Supply support for BC847BT-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, energy-efficient components for industrial, computing, consumer, and automotive markets.
The BC847 series belongs to Diodes' small-signal transistor product line, engineered for compact, high-yield assembly in portable and sensor-edge applications where consistent gain, low saturation voltage, and ultra-small footprint are essential.
FAQ
What is the marking code for BC847BT-7?
The top-side marking for BC847BT-7 is "1F", followed by a two-character date code (e.g., "K9" for September 2023). This matches Diodes' standard SOT523 marking convention defined in DS30274 Rev. 11–2, where "1F" identifies the B-gain bin variant.
Is BC847BT-7 suitable for automotive applications?
Standard BC847BT-7 is not AEC-Q101 qualified. However, Diodes offers the automotive-compliant BC847BTQ variant - identical electrically but validated for –40°C to +150°C operation, with enhanced process controls and lot-level traceability per AEC standards.
How does BC847BT-7 compare to BC847AT-7 and BC847CT-7?
BC847AT-7 (hFE = 110–290), BC847BT-7 (hFE = 220–450), and BC847CT-7 (hFE = 420–800) share identical absolute ratings, package, and pinout - differing only in DC current gain bin. Designers select based on required gain margin and circuit sensitivity to hFE variation.
What is the recommended pad layout for SOT523?
Diodes specifies a minimum 1oz copper pad layout on FR-4: 0.70mm × 0.51mm for each terminal, with 0.20mm solder mask clearance. Full dimensions and land patterns are published at diodes.com/package-outlines.html under SOT523 - critical for achieving rated RθJA = 833°C/W and avoiding tombstoning during reflow.
BC847BT-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:
- 200 @ 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
BC847BT-7 FAQ
1.How can I place an order for BC847BT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC847BT-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 BC847BT-7 reliable?
The price and inventory of BC847BT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847BT-7 is usually 5 days.
3.What payment methods are accepted for BC847BT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847BT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC847BT-7?
BC847BT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC847BT-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 BC847BT-7?
For technical support, including BC847BT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847BT-7 requirements.
6.How does Aetrix verify that BC847BT-7 is sourced from the original manufacturer or authorized distributors?
All BC847BT-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 BC847BT-7 meets industry standards.
7.What is the process for return or replacement of BC847BT-7?
All BC847BT-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC847BT-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 BC847BT-7 part is unused and in its original packaging.
Return procedure for BC847BT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC847BT-7 Tags
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MMBT3906LT1G
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MMBT3904-7-F
Diodes Incorporated
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Diodes Incorporated
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Micro Commercial Co
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Diodes Incorporated
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BC847B,215
Nexperia USA Inc.
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
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