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Nexperia USA Inc. BC846SF
- Part No.:
- BC846SF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
BC846SF.pdf
- Description:
- TRANS 2NPN 65V 100MA 6-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
BC846SF from Nexperia is a dual NPN general-purpose transistor in SOT363-3 (TSSOP6) package, with per-transistor VCEO = 65 V, IC = 100 mA, hFE = 110 (at VCE = 5 V, IC = 2 mA), and Ptot = 220 mW (per transistor). It enables compact dual-channel switching or amplification in space-constrained signal routing nodes.
For engineers reviewing the BC846SF datasheet, BC846SF pinout, BC846SF application, or BC846SF equivalent, this page delivers verified pin functions, thermal derating curves, saturation voltage behavior across temperature, and validated alternatives for dual-NPN discrete replacement in low-voltage logic interface and sensor signal conditioning circuits.
Technical Context
The BC846SF integrates two electrically isolated NPN transistors in a single TSSOP6 package, sharing no internal substrate coupling-ensuring independent operation without crosstalk. Each transistor exhibits standard BJT characteristics: forward-active gain control, defined saturation thresholds, and breakdown limits compliant with IEC 60134 Absolute Maximum Ratings.
Its thermal resistance Rth(j-a) is 568 K/W per transistor on FR4 PCB (single-sided, 35 µm Cu), and 416 K/W per device-enabling predictable power dissipation management in ambient temperatures from –65 °C to +150 °C. Junction-to-solder-point resistance is 230 K/W, supporting reliable reflow soldering design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 65 V - Maximum collector-emitter voltage before breakdown; defines safe switching range in 5–48 V logic-level applications. |
| IC | 100 mA - Continuous DC collector current limit; supports medium-current digital output buffering and small-signal amplification. |
| hFE | 110 - DC current gain at 2 mA collector bias; ensures stable base drive sizing for predictable switching thresholds. |
| VCE(sat) | 300 mV max at IC = 100 mA, IB = 5 mA - Low saturation voltage reduces conduction loss in active-low switch configurations. |
| Ptot (per transistor) | 220 mW - Thermal power limit on standard FR4 PCB; requires derating above 25 °C ambient per Fig. 1 curve. |
| fT | 100 MHz - Transition frequency at 10 mA/5 V; confirms suitability for audio-band and low-MHz digital signal amplification. |
Pinout & Package
SOT363-3 (TSSOP6) plastic surface-mount package, 1.3 mm × 2.2 mm footprint, 0.65 mm pitch, 0.9 mm max height, with transparent top view and pin 1 index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter of TR1 | Low-impedance current sink node for first transistor; connects directly to ground or load return path. |
| 2 | Base of TR1 | Control input for TR1; requires current-limited drive (e.g., 1–10 kΩ series resistor) to avoid overdrive. |
| 3 | Collector of TR2 | High-side output node for second transistor; used for sourcing current when TR2 is configured as emitter-follower or switch. |
| 4 | Emitter of TR2 | Current return path for TR2; electrically isolated from E1-enables independent biasing of both transistors. |
| 5 | Base of TR2 | Dedicated control input for TR2; no shared base connection-eliminates inter-transistor feedback paths. |
| 6 | Collector of TR1 | Primary output node for TR1; commonly used in common-emitter switching or amplifier stages with collector load. |
Key Features
| Feature | Design Value |
|---|---|
| Electrically isolated dual transistors | No mutual interference between TR1 and TR2-verified by independent VCEO, hFE, and leakage specs per transistor. |
| Low-profile SMT package | SOT363-3 footprint saves >60% board area vs. two discrete SOT23 devices; compatible with standard TSSOP6 reflow profiles. |
| Thermal robustness | Rth(j-sp) = 230 K/W enables direct thermal coupling to PCB copper pour-critical for sustained 100 mA operation. |
| Wide operating temperature | Specified from –65 °C to +150 °C junction temperature-supports industrial and automotive under-hood auxiliary circuits. |
Applications
| Logic-Level Signal Switching | Sensor Interface Amplification |
|---|---|
|
Use Scenario: Dual-channel level translation between 3.3 V microcontroller GPIOs and 5 V peripheral enable lines. IC Role / Device Role / Timing Role: NPN switch pair driving pull-up loads with fast turn-on (<100 ns) and controlled rise time. Use Value: Eliminates need for two separate SOT23 transistors while maintaining independent timing control per channel. |
Use Scenario: Amplifying low-amplitude analog outputs from thermistors and Hall-effect sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier stage with fixed 110 hFE and <1.5 pF Cc for minimal phase shift. Use Value: Enables stable 20–200 kHz gain staging without oscillation risk due to low inter-transistor capacitance coupling. |
| LED Driver Pair | Redundant Logic Gate Input Buffer |
|
Use Scenario: Driving dual-color (red/green) indicator LEDs from MCU PWM outputs with independent current limiting. IC Role / Device Role / Timing Role: Two independent saturated switches controlling LED anodes with VCE(sat) ≤ 300 mV at 20 mA. Use Value: Reduces component count and layout complexity while ensuring matched brightness via identical transistor parameters. |
Use Scenario: Providing fault-tolerant input buffering for critical watchdog or reset signals in industrial PLC modules. IC Role / Device Role / Timing Role: Dual-path signal conditioning where either TR1 or TR2 can maintain logic integrity if one fails open. Use Value: Supports hot-swap redundancy without external OR-gating-leverages inherent isolation between transistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC847BF | Higher hFE (200 min at IC = 2 mA); same VCEO, IC, package | Better suited for low-base-drive applications (e.g., high-impedance MCU outputs); slightly higher leakage at 150 °C | Select when base current budget is constrained and gain stability at low IC is prioritized over leakage. |
| MMDT3904 | Same VCEO (60 V), lower hFE (100 min), higher Ptot (300 mW per device), same SOT363-3 | Higher power handling allows sustained 100 mA switching at elevated ambient; wider hFE spread impacts matching | Prefer for thermally demanding environments where per-device power margin exceeds 220 mW requirement. |
Compared with BC846SF, BC847BF offers higher gain for weak-drive scenarios but less thermal headroom, while MMDT3904 trades gain consistency for greater total power capability-making BC846SF optimal for balanced gain, size, and thermal performance in space-limited signal chains.
Availability
BC846SF is available at Aetrix Electronics and suitable for logic-level signal switching, sensor interface amplification, LED driver pairing, and redundant logic gate input buffering requiring stable component supply and consistent parametric performance across production lots.
Supply support for BC846SF 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic components, with leadership in automotive-qualified and industrial-grade standard parts.
The BC846SF belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-sensitive, space-constrained applications requiring predictable DC gain, low saturation voltage, and robust thermal behavior in consumer, industrial, and computing systems.
FAQ
Is BC846SF pin-compatible with BC846B or BC847B?
No-BC846SF uses SOT363-3 (6-pin TSSOP), while BC846B/BC847B are in SOT23 (3-pin) packages. Pin mapping, thermal performance, and dual-transistor integration differ fundamentally. Substitution requires PCB layout revision and validation of per-transistor gain and saturation behavior.
What is the maximum continuous current per transistor at 85 °C ambient?
At 85 °C ambient, derating from 220 mW (25 °C) follows the 568 K/W Rth(j-a): Pmax = 220 mW × (1 − (85−25)/568) ≈ 175 mW. With VCE(sat) ≤ 300 mV, this supports ~580 mA peak but only ~100 mA continuous-matching the IC = 100 mA rating.
Can BC846SF be used in linear amplifier mode with stable gain?
Yes-hFE is specified at 110 (min) with tight typical distribution, and fT = 100 MHz ensures usable bandwidth up to ~1 MHz in common-emitter configuration. Stable operation requires emitter degeneration resistors and proper VCE bias ≥ 1 V to avoid saturation distortion.
Does BC846SF have automotive qualification?
No-BC846SF is not AEC-Q101 qualified. Its datasheet states "non-automotive qualified products" and excludes automotive use unless explicitly tested and validated by the customer. For automotive applications, Nexperia's BC846B-Q series or equivalent AEC-Q101 dual transistors must be selected.
BC846SF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- 300mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 110 @ 2mA, 5V
- Power - Max:
- 200mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP
BC846SF FAQ
1.How can I place an order for BC846SF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC846SF 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 BC846SF reliable?
The price and inventory of BC846SF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC846SF is usually 5 days.
3.What payment methods are accepted for BC846SF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846SF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC846SF?
BC846SF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC846SF 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 BC846SF?
For technical support, including BC846SF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846SF requirements.
6.How does Aetrix verify that BC846SF is sourced from the original manufacturer or authorized distributors?
All BC846SF 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 BC846SF meets industry standards.
7.What is the process for return or replacement of BC846SF?
All BC846SF units undergo pre-shipment inspection (PSI). If there is an issue with BC846SF, 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 BC846SF part is unused and in its original packaging.
Return procedure for BC846SF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC846SF Tags
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DMMT5401-7-F
Diodes Incorporated
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DMMT5551-7-F
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DMMT3904W-7-F
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DMMT3906W-7-F
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FMB3904
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FMB2222A
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ULQ2003D1013TR
STMicroelectronics
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ZXTD4591E6TA
Diodes Incorporated
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