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Product Detailed Parameters
- Description：IC REG LINEAR -12V 100MA TO92-3
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Negative
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：-35V
- Voltage - Output (Min/Fixed)：-12V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：100mA
- Current - Quiescent (Iq)：6 mA
- Current - Supply (Max)：6.5 mA
- PSRR：42dB (120Hz)
- Control Features：-
- Protection Features：Over Temperature, Short Circuit
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The L79L12ACZ-TR is a three-terminal negative linear voltage regulator from the STMicroelectronics L79L series. It provides a fixed output voltage of -12 V with an output current capability up to 100 mA. The device operates within a DC input voltage range of -14.5 V to -35 V and maintains operation across a junction temperature range of 0 °C to 125 °C. Electrical characteristics include a line regulation of 250 mV, load regulation of 100 mV, and a typical quiescent current of 6.5 mA at 25 °C. The unit is housed in a TO-92 package and supplied in tape and reel format.
Feature Summary
- Incorporates internal thermal overload protection and short-circuit protection for robust operation.
- Designed as a fixed voltage regulator requiring no external components for basic functionality.
- Offers improved effective output impedance compared to Zener diode/resistor combinations.
Applications
- Local or on-card regulation for eliminating noise associated with single-point regulation.
- Replacement for Zener diode/resistor combinations in low-noise applications.
- Use with power pass elements to construct high-current voltage regulators.
Procurement Notes
Verify that the ordering suffix matches the required packaging configuration, specifically tape and reel for automated assembly. Confirm the AC tolerance variant (-12 V ±5%) aligns with circuit requirements. Ensure the TO-92 package type is compatible with the intended through-hole mounting process. Cross-reference the manufacturer part number against official distributor catalogs to validate authenticity and production status.
Selection Notes
Select this component when a stable negative supply rail is required for low-to-moderate current loads. The fixed -12 V output simplifies design by removing the need for external feedback networks. Consider the thermal resistance characteristics of the TO-92 package to ensure adequate heat dissipation under maximum load conditions. Verify that the input voltage remains sufficiently above the dropout threshold to maintain regulation.
Part Context
This device belongs to the L79L family of negative voltage regulators manufactured by STMicroelectronics. The series includes variants for different output voltages such as -5 V, -8 V, and -15 V. The 'AC' designation indicates a tighter voltage tolerance compared to the standard 'C' grade. The L79L series serves as a complement to the positive L78L series, providing symmetrical power supply solutions.
Replacement Considerations
Compatible substitutes within the same family include L79L12ACZ (bulk) and L79L12ACUTR (SOT-89). Other manufacturers may offer pin-compatible equivalents, but electrical parameters must be verified against the original datasheet specifications.
