onsemi CS8122YTVA5

Overview

CS8122YTVA5 from onsemi is a precision 5.0 V ±2.0% low-dropout linear regulator delivering up to 750 mA output current with 0.6 V dropout at 500 mA, integrated delayed RESET function programmed via external RC network, and robust fault protection including −50 V reverse transient, 60 V load dump, short-circuit (1.2 A typ), and thermal shutdown - deployed in automotive power management and industrial control systems requiring stable 5 V supply with power-on reset sequencing.

For engineers reviewing the CS8122YTVA5 datasheet, pinout, applications, or equivalent options, key selection criteria include its externally programmable RESET delay (16–48 ms with 0.1 µF), operation down to 1.0 V output for brownout detection, CMOS/TTL-compatible open-collector RESET output, and TO-220 vertical-mount package with copper tab for heatsinking.

Technical Context

The CS8122YTVA5 integrates a bandgap reference, error amplifier, anti-saturation current-limit circuit, and dual hysteresis comparators for both RESET and delay functions - enabling reliable power-up sequencing independent of input voltage as long as VOUT ≥ 1.0 V. Its latching discharge circuit fully discharges the external delay capacitor during brief fault events, ensuring deterministic RESET pulse generation after regulation loss.

It features a pre-regulator stage for internal bias supply stability, ripple rejection of 54–75 dB at 120 Hz, and line/load regulation of ≤50 mV across −40°C to +125°C. Protection architecture includes reverse-battery tolerance (−30 V DC, −50 V transient), overvoltage shutdown at 32–40 V, and thermal shutdown triggered at 150–210°C.

Key Specifications

Pinout & Package

CS8122YTVA5 is housed in a TO-220 5-lead vertical-mount package (Case 314K), featuring a copper tab thermally connected to Pin 3 (GND) for heatsink attachment. The package has a typical junction-to-case thermal resistance (R_JC) of 2.1°C/W and R_JA of 50°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V LDO with RESET applications.

Compared with TLV70750PDBVR and TPS7B6750QPWPRQ1, the CS8122YTVA5 offers unique balance of programmable RESET timing, proven −50 V reverse transient immunity, and TO-220 thermal performance - making it optimal for cost-sensitive automotive modules where external delay tuning and ruggedness outweigh ultra-low IQ or AEC-Q100 certification needs.

Availability

CS8122YTVA5 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, telematics control units, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for CS8122YTVA5 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The CS8122YTVA5 belongs to onsemi's SMART REGULATOR® family of automotive-grade linear regulators, designed specifically for harsh-environment power management with integrated protection and precise reset functionality.

FAQ

What is the maximum input voltage the CS8122YTVA5 can withstand during load dump events?

The CS8122YTVA5 is rated for peak transient voltage of 60 V during load dump events at VIN = 14 V, and −50 V reverse transient voltage. These ratings are specified in the Absolute Maximum Ratings table and validated per ISO 7637-2 test pulses, making CS8122YTVA5 suitable for 12 V automotive systems without additional transient voltage suppressors.

How is the RESET delay time set for the CS8122YTVA5, and what capacitor value yields ~32 ms?

The RESET delay time for CS8122YTVA5 is set by an external capacitor connected between Pin 4 (Delay) and ground. With a typical delay charge current of 10 µA and delay thresholds of 3.25–3.75 V (charge) and 2.85–3.35 V (discharge), a 0.1 µF capacitor yields a nominal delay of 32 ms - matching the typical value shown in the Electrical Characteristics table.

Does the CS8122YTVA5 require an output capacitor, and what type is recommended?

Yes, the CS8122YTVA5 requires an output capacitor (COUT) for stability, as stated in Figure 13 and Application Notes. A 10 µF aluminum or tantalum electrolytic capacitor is recommended; ceramic capacitors with near-zero ESR may cause instability. The datasheet specifies that COUT must have sufficient ESR (typically >0.1 Ω) to ensure loop stability across temperature and load.

What thermal performance can be expected from the CS8122YTVA5 in a TO-220 vertical-mount package?

The CS8122YTVA5 in TO-220 vertical-mount (Case 314K) has a typical junction-to-case thermal resistance (R_JC) of 2.1°C/W and junction-to-ambient (R_JA) of 50°C/W. When mounted to a heatsink, total power dissipation capability increases significantly - for example, with a 10°C/W heatsink and 25°C ambient, CS8122YTVA5 can sustain ~2.2 W continuously without exceeding 150°C junction temperature.

Is the CS8122YTVA5 pin-compatible with the older CS8126 regulator?

Yes, the CS8122YTVA5 is a direct replacement for the CS8126 in the same TO-220 package, sharing identical pinout (VIN, VOUT, GND, Delay, RESET) and footprint. The primary upgrade is tighter output voltage tolerance (±2.0% vs. ±4.0%) and improved fault protection - no PCB changes are required when upgrading from CS8122YTVA5 to CS8126 or vice versa.