Renesas HA179L12U-TL-E

Overview

HA179L12U-TL-E from Renesas Electronics is a three-terminal negative fixed-voltage linear regulator delivering –12 V output with ±4% tolerance, 1.3 V dropout voltage, and 800 mW maximum power dissipation at Ta ≤ 25°C on alumina ceramic board. It integrates overcurrent and overtemperature protection and is optimized for audio-frequency ripple rejection in stabilized negative supply rails.

For engineers reviewing the HA179L12U-TL-E datasheet, HA179L12U-TL-E pinout, HA179L12U-TL-E application, or HA179L12U-TL-E equivalent, this device serves as a compact, UPAK-packaged replacement for Zener-based negative biasing in analog signal chains, industrial control interfaces, and dual-rail op-amp supplies where low-noise, thermally robust regulation is required.

Technical Context

The HA179L12U-TL-E implements a monolithic bandgap reference, error amplifier, and series pass transistor in a single IC to regulate negative output voltage. Its internal thermal shutdown activates above +125°C junction temperature, and current limiting engages at ~250 mA short-circuit output current.

Designed for operation across –40°C to +85°C ambient, it maintains stable –12 V output under input voltages from –16 V to –27 V (line regulation tested), with load regulation of ≤50 mV across 1–40 mA output current. Ripple rejection reaches 100 dB at 120 Hz and remains >60 dB up to 10 kHz.

Key Specifications

Pinout & Package

HA179L12U-TL-E uses the UPAK (SC-62) surface-mount package: 4.8 mm × 3.8 mm × 0.7 mm body, 0.65 mm lead pitch, 3-terminal configuration with gull-wing leads. Mass: 0.050 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative fixed-voltage regulation applications.

Compared with LM7912CDT/NOPB and MC7912BD2TR4G, HA179L12U-TL-E offers superior thermal robustness via integrated overtemperature and overcurrent protection in a smaller UPAK footprint, while trading ±2% tolerance for guaranteed fault safety in cost-sensitive industrial designs.

Availability

HA179L12U-TL-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, audio signal conditioning, and test equipment requiring stable component supply with guaranteed long-term continuity.

Supply support for HA179L12U-TL-E 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

Renesas Electronics is a Japanese semiconductor manufacturer specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and infrastructure markets.

The HA179L00 Series was designed specifically for compact, reliable negative voltage regulation in space-constrained industrial and audio applications-replacing discrete Zener-diode-based solutions with integrated protection and consistent performance.

FAQ

What is the maximum input voltage rating for HA179L12U-TL-E?

The absolute maximum input voltage for HA179L12U-TL-E is –35 V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. For reliable regulation, the recommended input range is –16 V to –27 V, ensuring sufficient headroom for the 1.3 V dropout while maintaining line regulation within specification. Always verify input transient margins in the final design using HA179L12U-TL-E's published derating curves.

Does HA179L12U-TL-E require external capacitors for stability?

Yes, HA179L12U-TL-E requires two external capacitors per the standard circuit: a 0.33 μF ceramic capacitor (CIN) between input and common, and a 0.1 μF ceramic capacitor (CL) between output and common. These values are validated in the datasheet for all electrical characteristics testing and ensure phase margin >45° across temperature and load. Omitting or undersizing either capacitor may cause oscillation or degraded ripple rejection in HA179L12U-TL-E operation.

How does the thermal protection in HA179L12U-TL-E operate?

HA179L12U-TL-E incorporates an internal thermal shutdown circuit that disables the output when junction temperature exceeds approximately 125°C. Recovery is automatic once the die cools below the hysteresis threshold (~110°C). This protection operates independently of load current and is effective even under no-load conditions if ambient temperature or PCB copper area is insufficient. The 800 mW power dissipation rating assumes mounting on a 15 mm × 25 mm × 0.7 mm alumina ceramic board-actual thermal performance of HA179L12U-TL-E depends on PCB layout and airflow.

Can HA179L12U-TL-E be used in place of a Zener diode for negative biasing?

Yes, HA179L12U-TL-E is explicitly positioned as a superior alternative to Zener diode + transistor negative regulators, offering tighter output tolerance (±4% vs. ±5–10% for Zener stacks), lower output impedance, integrated protection, and better ripple rejection. Unlike passive Zener solutions, HA179L12U-TL-E maintains regulation across 1–40 mA loads without resistor recalibration and eliminates thermal drift concerns inherent in discrete implementations.

What is the meaning of "TL" in HA179L12U-TL-E?

The "TL" suffix in HA179L12U-TL-E denotes tape-and-reel packaging: 1,000 units per reel, compatible with automated SMT placement equipment. The "E" suffix indicates compliance with RoHS Directive 2011/65/EU and halogen-free materials per J-STD-609. This marking aligns with Renesas' standardized taping abbreviation scheme defined in the HA179L00 Series datasheet ordering information table.