SMMUN2134LT1G

Overview

The SMMUN2134LT1G is a single PNP Bipolar Digital Transistor (BRT) manufactured by onsemi. It integrates a transistor with an internal bias resistor network to simplify circuit design. Key electrical parameters include a maximum collector-emitter voltage (VCEO) of 50 V and a continuous collector current of 100 mA. The device features a typical input resistance of 22 kOhms and a typical resistor ratio of 0.47. Power dissipation is rated at 246 mW, with a minimum DC collector/base gain (hfe) of 80. It operates within a temperature range of -55 C to +150 C and is housed in a surface-mount SOT-23-3 package.

Feature Summary

• Integrates a PNP bipolar junction transistor with an internal base bias resistor network to reduce component count and board space.
• Designed as a direct replacement for discrete transistor and resistor combinations in switching and amplification applications.
• Provides stable biasing characteristics through integrated resistive elements, ensuring consistent performance across operating conditions.

Applications

• General-purpose switching circuits requiring simplified bias networks
• Logic interface level shifting between different voltage domains
• Driver stages for relays, solenoids, or small loads

Procurement Notes

Verify the specific ordering suffix 'T1G' to ensure compliance with tape-and-reel packaging specifications and RoHS directives. Confirm that the SOT-23-3 footprint matches the target PCB layout requirements. Cross-reference the manufacturer datasheet for thermal derating curves relevant to the intended power dissipation limits. Ensure supply chain sources provide original manufacturer documentation to validate authenticity and traceability.

Selection Notes

Select this component when a compact PNP digital transistor solution is required for low-power switching tasks. The 50 V rating and 100 mA current capacity suit standard logic-level applications. Consider the 22 kOhm input resistance for compatibility with common microcontroller output drivers. Evaluate the SOT-23-3 package size against available board real estate constraints compared to larger through-hole alternatives.

Part Context

This part belongs to the MMUN2134L series of Bias Resistor Transistors from onsemi. These devices are engineered to replace individual transistors and external biasing resistors, thereby minimizing assembly steps and reducing overall system cost. The series offers various resistor configurations to accommodate different drive requirements while maintaining a standardized form factor for easy integration into existing designs.

Replacement Considerations

Direct substitutes include other PNP BRTs with similar VCEO and Ic ratings, such as the MMUN2134LT1G. Verify pinout compatibility and internal resistor values before substitution. Alternative packages may require schematic adjustments. Consult manufacturer cross-reference tools for validated equivalent parts meeting identical electrical specifications.