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Product Detailed Parameters
- Description：IC REG LINEAR 12V 500MA DPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：12V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：500mA
- Current - Quiescent (Iq)：6 mA
- Current - Supply (Max)：-
- PSRR：55dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：DPAK
- Grade：-
- Qualification：-
Download product information
Overview
The L78M12ABDT-TR is a three-terminal positive linear voltage regulator from the L78MxxA series by STMicroelectronics, housed in a surface-mount DPAK package. It provides a fixed output voltage of 12 V with a maximum output current of 0.5 A and an input voltage range up to 35 V. The device features ±2% output voltage tolerance and operates within a junction temperature range of -40 °C to +125 °C. Electrical characteristics include a typical quiescent current of 6 mA, line regulation of 100 mV, load regulation of 240 mV, and supply voltage rejection of 55 dB at 120 Hz.
Feature Summary
- Integrated thermal overload protection that shuts down the circuit during excessive power conditions
- Internal short-circuit protection limits maximum output current to prevent damage
- Output transistor safe-area compensation reduces output current as voltage across the pass transistor increases
Applications
- Local on-card voltage regulation
- Distribution systems replacing single-point regulation
- Adjustable voltage and current circuits using external components
Procurement Notes
Verify the specific AB suffix indicates the extended temperature range (-40 °C to +125 °C) compared to AC variants. Confirm the DT suffix corresponds to the DPAK surface-mount package. Ensure compatibility with required PCB footprint dimensions for the TO-252 style housing.
Selection Notes
Select this component when a fixed 12 V output is required with moderate current demands up to 500 mA. The DPAK package is suitable for applications requiring surface-mount assembly. Consider the thermal resistance values for heat dissipation planning under maximum load conditions.
Part Context
This part belongs to the L78MxxA family of precision regulators available in multiple fixed voltages including 5, 6, 8, 9, 10, 12, 15, and 24 V. The series is designed for robust performance in various electronic designs, offering internal protections to ensure reliability without external components.
Replacement Considerations
L78M12ACDT-TR (Same manufacturer, different temperature grade)
FAQ
What is the purpose of the output transition SOA protection?
It ensures the device remains indestructible by reducing the output short-circuit current as the voltage across the pass transistor increases.
Is an input bypass capacitor required?
While not strictly required for low-current applications, it is recommended if long wire lengths connect the regulator to the power supply filter or if the output load capacitance is large.
