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onsemi BSS64LT1
- Part No.:
- BSS64LT1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BSS64LT1.pdf
- Description:
- TRANS NPN 80V 0.1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
BSS64LT1 from onsemi is an NPN silicon small-signal driver transistor in SOT-23 package, rated for 80 VCEO, 100 mA continuous collector current, and 60 MHz fT, commonly used in low-power switching and amplification stages of power management and interface circuits.
For engineers reviewing the BSS64LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VCEO/IC margin for 24 V rail switching, HFE stability across temperature, VCE(sat) at drive-current levels, and thermal derating on FR-5 PCBs.
Technical Context
This NPN transistor operates in linear or saturated switching mode with a minimum DC current gain (HFE) of 20 at IC = 10 mA and VCE = 1.0 V. Its 60 MHz fT supports medium-speed digital and analog signal handling up to ~10 MHz square-wave switching.
Thermal performance is defined for two mounting conditions: 225 mW on FR-5 board (derating 1.8 mW/°C above 25°C) and 300 mW on alumina substrate (derating 2.4 mW/°C), reflecting its use in space-constrained industrial modules where localized heatsinking is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - Supports operation with 24 V or 48 V supply rails while maintaining safe margin against transients. |
| IC (continuous) | 100 mA - Suitable for driving small relays, LEDs, or logic-level inputs without external buffering. |
| fT | 60 MHz - Enables reliable switching at frequencies up to 10 MHz with controlled rise/fall times. |
| VCE(sat) | 0.15 V @ IC = 4 mA, IB = 400 µA - Minimizes conduction loss in low-side switch configurations. |
| HFE | 20 min @ VCE = 1.0 V, IC = 10 mA - Provides predictable base drive requirements for stable biasing. |
| RJA (FR-5) | 556 °C/W - Requires careful layout thermal relief for sustained >50 mA operation at ambient >70°C. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm body, 1.90 mm lead pitch. RoHS-compliant, Pb-free, halogen-free/BFR-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input requiring current-limited drive; typical RB = 1–10 kΩ for saturation at IC ≤ 50 mA. |
| 2 | Emitter | Common reference node; connected to ground or low-side return path in switching applications. |
| 3 | Collector | Output terminal carrying load current; routed to VCC-side loads (e.g., relay coil, LED anode). |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free, halogen-free/BFR-free | Complies with RoHS Directive 2011/65/EU and JEDEC JS709E; eliminates hazardous substance reporting burden. |
| VCEO = 80 V | Enables direct replacement of legacy 60 V transistors in 24 V industrial control systems with headroom for surge suppression. |
| VCE(sat) ≤ 0.2 V | Reduces power dissipation below 10 mW at IC = 20 mA, supporting thermally constrained sensor interface PCBs. |
| fT = 60 MHz | Supports clean edge integrity in PWM dimming drivers and microcontroller GPIO-expansion buffers. |
Applications
| Industrial Sensor Interface | Low-Voltage Relay Driver |
|---|---|
Use Scenario: Amplifying weak analog signals from RTD or thermistor bridges before ADC sampling in programmable logic controllers. IC Role / Device Role / Timing Role: NPN emitter-follower buffer providing high-input impedance and low-output impedance signal conditioning. Use Value: HFE ≥ 20 ensures stable gain over −40°C to +125°C ambient, minimizing calibration drift. | Use Scenario: Switching 24 VDC industrial relays with microcontroller GPIO pins incapable of sourcing >5 mA. IC Role / Device Role / Timing Role: Low-side saturated switch translating logic-high to grounded load return path. Use Value: VCE(sat) ≤ 0.15 V limits relay-coil power loss to <10 mW, preventing thermal stress on adjacent components. |
| LED Current Sink | Level-Shifting Interface |
Use Scenario: Driving status indicator LEDs from 3.3 V MCU outputs in medical device front panels. IC Role / Device Role / Timing Role: Constant-current sink configured with emitter resistor, operating in active region for brightness control. Use Value: 100 mA IC rating allows parallel LED strings up to 80 mA with 20% safety margin. | Use Scenario: Translating 1.8 V logic outputs to 5 V-tolerant peripheral inputs in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Common-emitter level shifter with pull-up to 5 V, enabling bidirectional voltage translation. Use Value: 60 MHz fT supports clean 10 MHz clock/data edges without overshoot or rounding. |
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 = 40 V, IC = 200 mA, fT = 300 MHz | Lower voltage rating; higher speed and current capability | Preferred for 3.3/5 V logic-level shifting where 80 V margin is unnecessary. |
| ZTX653 | VCEO = 100 V, IC = 1 A, SOT-89 package | Higher power, larger footprint, TO-92/SOT-89 compatible | Selected when >100 mA load current or >1 W dissipation is required in non-space-constrained designs. |
Compared with MMBT3904LT1G and ZTX653, the BSS64LT1 offers optimal balance of 80 V breakdown, SOT-23 compactness, and thermal behavior on standard FR-5 boards-making it preferred for 24 V industrial interfaces where voltage margin and board area are both critical.
Availability
BSS64LT1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-voltage relay drivers, LED current sinks, and level-shifting interfaces requiring stable component supply and long-term manufacturability.
Supply support for BSS64LT1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BSS64LT1 belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability and consistency in cost-sensitive, high-volume industrial control and interface applications.
FAQ
What is the maximum continuous collector current rating for the BSS64LT1?
The BSS64LT1 has a maximum continuous collector current (IC) rating of 100 mA at TA = 25°C on FR-5 board. Derating applies above 25°C (1.8 mW/°C), limiting usable current under elevated ambient temperatures. This rating makes the BSS64LT1 appropriate for driving small relays, LEDs, or logic inputs but not high-current solenoids or motors. Always verify junction temperature using RJA = 556 °C/W in thermal design.
Is the BSS64LT1 pin-compatible with the MMBT3904 series?
No, the BSS64LT1 is not pin-compatible with the MMBT3904 series. While both use SOT-23 packages, the BSS64LT1 follows Style 6 pinout (1=Base, 2=Emitter, 3=Collector), whereas MMBT3904LT1G uses Style 1 (1=Emitter, 2=Base, 3=Collector). Swapping them without PCB revision will result in incorrect biasing and potential device failure. Always confirm pinout per manufacturer marking diagram before substitution.
What is the typical VCE(sat) of the BSS64LT1 under standard switching conditions?
The BSS64LT1 exhibits VCE(sat) ≤ 0.15 V at IC = 4.0 mA and IB = 400 µA, and ≤ 0.2 V at IC = 50 mA and IB = 15 mA. These values reflect guaranteed saturation performance under defined test conditions and enable low-loss switching in 24 V industrial control nodes. Designers should size base resistors to ensure sufficient IB/IC ratio (≥1/10) to maintain this specification across temperature.
Does the BSS64LT1 meet RoHS and halogen-free requirements?
Yes, the BSS64LT1 is RoHS-compliant and halogen-free/BFR-free, as confirmed in the official onsemi datasheet (Rev. 7, January 2025). The "G" suffix denotes Pb-free packaging, and the device meets JEDEC JS709E standards. This compliance supports environmental program requirements for industrial and medical equipment sold in EU, China, and other regulated markets without requiring additional substance declarations.
What is the thermal resistance (RJA) of the BSS64LT1 on standard FR-5 PCB?
The BSS64LT1 has a thermal resistance RJA of 556 °C/W when mounted on an FR-5 board (1.0 × 0.75 × 0.062 in.), per Note 1 in the onsemi datasheet. This value assumes minimal copper pour; adding thermal vias and 1-in² copper pad can reduce effective RJA by ~20–30%. For designs operating continuously above 70°C ambient, thermal simulation using this RJA is essential to avoid exceeding the 150°C maximum junction temperature.
BSS64LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 200mV @ 15mA, 50mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 20 @ 10mA, 1V
- Power - Max:
- 225 mW
- Frequency - Transition:
- 60MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BSS64LT1 FAQ
1.How can I place an order for BSS64LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BSS64LT1 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 BSS64LT1 reliable?
The price and inventory of BSS64LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS64LT1 is usually 5 days.
3.What payment methods are accepted for BSS64LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS64LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSS64LT1?
BSS64LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSS64LT1 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 BSS64LT1?
For technical support, including BSS64LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS64LT1 requirements.
6.How does Aetrix verify that BSS64LT1 is sourced from the original manufacturer or authorized distributors?
All BSS64LT1 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 BSS64LT1 meets industry standards.
7.What is the process for return or replacement of BSS64LT1?
All BSS64LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BSS64LT1, 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 BSS64LT1 part is unused and in its original packaging.
Return procedure for BSS64LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BSS64LT1 Tags
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