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Product Detailed Parameters
- Description：IC REG LINEAR 9V 1.5A D2PAK
- 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)：9V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：2V @ 1A (Typ)
- Current - Output：1.5A
- Current - Quiescent (Iq)：8 mA
- Current - Supply (Max)：-
- PSRR：55dB (120Hz)
- Control Features：-
- Protection Features：Over Temperature, Short Circuit
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Supplier Device Package：D2PAK
- Grade：-
- Qualification：-
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Overview
The L7809CD2T-TR is a fixed positive linear voltage regulator from the STMicroelectronics L78 series, designed for surface-mount applications. It provides a fixed output voltage of 9 V with a maximum continuous output current of 1.5 A. The device accepts an input voltage up to 35 V and operates within a junction temperature range of 0 °C to +125 °C. Key electrical characteristics include a typical static current of 4.3 mA, line regulation of 240 mV, and load regulation of 100 mV. It features internal thermal overload and short-circuit protection mechanisms.
Feature Summary
- Fixed 9 V output voltage capability
- High current handling up to 1.5 A
- Integrated thermal and short-circuit protection
Applications
- General-purpose power supply regulation
- Local on-card regulation systems
- Embedded electronics power management
Procurement Notes
Verify the specific package marking and date code against the manufacturer's latest datasheet to ensure authenticity. Confirm that the D2PAK-3 footprint matches the design requirements. Check for RoHS compliance status as indicated in the official documentation. Ensure the ordering suffix corresponds to the correct reel packaging configuration.
Selection Notes
Select this component when a reliable 9 V source is required at currents up to 1.5 A in a compact surface-mount form factor. Consider the thermal dissipation capabilities of the D2PAK package relative to the expected ambient temperature and load conditions. Verify that the input voltage remains within the specified limits to maintain proper regulation and prevent damage.
Part Context
This part belongs to the widely used L78xx family of three-terminal positive linear regulators. The CD2T suffix indicates a surface-mount D2PAK (TO-263) package variant optimized for automated assembly. It serves as a direct replacement for through-hole TO-220 versions in designs requiring reduced board space while maintaining similar electrical performance profiles.
Replacement Considerations
Compatible substitutes include other manufacturers' equivalents such as MC78L09 or LM7809 variants, provided they match the 1.5 A current rating and D2PAK package dimensions. Ensure pinout compatibility and thermal resistance specifications align with the original design constraints.
