Renesas HA178L12UA-TR-E

Overview

HA178L12UA-TR-E from Renesas is a three-terminal fixed-output linear voltage regulator delivering 12 V ±5% at up to 150 mA, featuring internal overcurrent and thermal protection, 800 mW power dissipation capability, and UPAK (SC-62) surface-mount package. It serves as a stable local power source for low-power analog and digital circuitry in industrial control modules and sensor interfaces.

For engineers reviewing the HA178L12UA-TR-E datasheet, HA178L12UA-TR-E pinout, HA178L12UA-TR-E application, or HA178L12UA-TR-E equivalent, key selection considerations include dropout voltage (1.7 V), ripple rejection (52 dB at 120 Hz), temperature coefficient (–0.3 mV/°C), and UPAK package thermal performance on standard PCB layouts.

Technical Context

The HA178L12UA-TR-E implements a monolithic IC architecture with an internal 2.5 V reference, error amplifier, pass transistor, and dual protection circuits - overcurrent limiting and thermal shutdown. Its regulation loop maintains output stability across input voltages from 14.5 V to 27 V and load currents from 1 mA to 150 mA.

Designed for commercial-grade operation (–40°C to +85°C ambient), it requires only two external capacitors (0.33 μF input, 0.1 μF output) for stable operation and exhibits minimal quiescent current variation (≤0.2 mA) across its rated load range.

Key Specifications

Pinout & Package

HA178L12UA-TR-E uses the UPAK (SC-62) surface-mount package: 3-pin, single-row, gull-wing leads, 2.54 mm pitch, 4.5 mm × 2.5 mm footprint, 0.75 mm max height, 0.050 g mass. Designed for reflow soldering on standard FR-4 PCBs with thermal pad grounding recommended.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Compared with TL78L12ACDR and MC78L12ACP, HA178L12UA-TR-E provides superior thermal safety, tighter output tolerance, and a compact surface-mount footprint optimized for automated production - making it the preferred choice for volume-manufactured industrial and IoT endpoints requiring reliability and space efficiency.

Availability

HA178L12UA-TR-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded microcontroller power rails, IoT edge node subsystems, and portable test equipment requiring stable component supply and long-term manufacturability.

Supply support for HA178L12UA-TR-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 Corporation is a global semiconductor leader specializing in microcontrollers, analog power, and connectivity solutions for automotive, industrial, and enterprise applications.

The HA178L00 series was developed as a cost-effective, protection-integrated linear regulator family targeting commercial and industrial power management in space-constrained, thermally demanding environments.

FAQ

What is the maximum input voltage rating for HA178L12UA-TR-E?

The absolute maximum input voltage for HA178L12UA-TR-E is 35 V DC, as specified in the Absolute Maximum Ratings table. However, for reliable continuous operation, the recommended input range is 14.5 V to 27 V - this ensures proper regulation, thermal margin, and compliance with line regulation specifications. Exceeding 27 V may trigger internal protection or degrade long-term reliability.

Does HA178L12UA-TR-E require external capacitors, and what values are recommended?

Yes, HA178L12UA-TR-E requires two external capacitors: a 0.33 μF ceramic capacitor placed between IN and GND (within 10 mm of the package), and a 0.1 μF ceramic capacitor between OUT and GND. These values are validated in the datasheet's Standard Circuit diagram and ensure stability across all operating conditions - omitting or substituting with higher-ESR types risks oscillation or poor transient response.

Is HA178L12UA-TR-E compatible with lead-free reflow soldering processes?

Yes, HA178L12UA-TR-E is qualified for lead-free reflow soldering per JEDEC J-STD-020. Its UPAK package supports peak temperatures up to 260°C for 10 seconds. The device's thermal protection circuit remains functional during soldering, and the plastic body meets RoHS and REACH requirements - no special pre-bake or moisture sensitivity handling is required.

How does the thermal protection in HA178L12UA-TR-E behave during overload?

When junction temperature exceeds safe limits due to overload or high ambient, HA178L12UA-TR-E's thermal protection circuit disables the output pass transistor, dropping VOUT to near zero. Once the die cools below the hysteresis threshold (~15°C below trip point), regulation automatically resumes. This cycle repeats until the fault condition is removed - protecting both the HA178L12UA-TR-E and downstream circuitry without latch-up.

Can HA178L12UA-TR-E be used as a replacement for Zener diode-based shunt regulators?

Yes, HA178L12UA-TR-E can replace discrete Zener-based shunt regulators in low-current applications (<150 mA), offering superior voltage accuracy (±5% vs typical ±10% Zener tolerance), lower dynamic impedance, and built-in protection. Unlike Zeners, it regulates from a current-limited source rather than dissipating excess power - improving efficiency and thermal predictability in fixed-rail designs.