onsemi CS8311YD8

Overview

CS8311YD8 from onsemi is a precision 10 V micropower linear voltage regulator with ±4.0% output accuracy, 100 mA load capability, and 400 mV typical dropout at full load. It features ENABLE and active-low open-collector RESET outputs, operates from 11 V to 26 V input, and delivers stable regulation down to 1.0 V for reset assertion-making it suitable for automotive microprocessor power sequencing and battery-backed systems.

For engineers reviewing the CS8311YD8 datasheet, pinout, applications, or equivalent options, key selection considerations include its 100 µA quiescent current in active mode, 20 µA sleep-mode IQ, reverse-battery tolerance (–15 V), 60 V transient survivability, and Kelvin-sense VOUTSense pin for remote voltage regulation.

Technical Context

The CS8311YD8 integrates a bandgap reference, error amplifier, current-limit protection, thermal shutdown, overvoltage shutdown (triggered at ≥30 V), and independent low-voltage detection circuitry for RESET. Its ENABLE input controls pass transistor conduction, while RESET asserts low when VOUT falls below 8.30–8.90 V (with 50–200 mV hysteresis) and remains valid down to 1.0 V output.

It employs internal current-source biasing and a sense-based feedback loop with VOUTSense enabling remote sensing. Protection includes short-circuit limiting (25–125 mA), thermal foldback above ~180°C junction temperature, and reverse-current blocking (≤250 µA from VOUT to VIN).

Key Specifications

Pinout & Package

CS8311YD8 is housed in an SO–8 (Case 751) surface-mount package with exposed pad not electrically connected. Pin 1 is marked with a dot; pins 6 and 7 are no-connect terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision automotive voltage regulator applications.

Compared with TLV70710PDBVR and MAX1725EUK10+T, the CS8311YD8 uniquely combines ENABLE, RESET, Kelvin sensing, –15 V reverse protection, and 60 V transient survival in a single SO-8 package-enabling full automotive power sequencing without supplemental components.

Availability

CS8311YD8 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and telematics systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CS8311YD8 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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.

The CS8311YD8 belongs to onsemi's Smart Regulator® family of automotive-qualified linear regulators, engineered specifically for robust power sequencing, fault resilience, and precise voltage regulation in harsh-temperature vehicle environments.

FAQ

What is the minimum input voltage required for the CS8311YD8 to regulate at 10 V?

The CS8311YD8 requires a minimum input voltage of 11 V to maintain regulation, as specified in the Electrical Characteristics table. Below this, dropout behavior occurs and output voltage drops linearly with input. This 1 V overhead ensures stable operation across automotive battery variations including cold-crank conditions where nominal 12 V systems dip to ~6–8 V-though regulation ceases below 11 V, the device remains functional and asserts RESET if VOUT falls out of spec.

Can the CS8311YD8 be used without connecting the VOUTSense pin?

Yes, the CS8311YD8 can be used without remote sensing by connecting the VOUTSense pin directly to the VOUT pin at the regulator output. This configuration disables Kelvin sensing and reverts to local feedback, maintaining ±4.0% output accuracy under typical PCB layout conditions. However, for applications with >50 mV IR drop between regulator and load, leaving VOUTSense unconnected degrades regulation accuracy at the load point.

Does the CS8311YD8 require an external pull-up resistor on the RESET pin?

Yes, the RESET pin is an open-collector NPN output and requires an external pull-up resistor (typically 10 kΩ to VCC or VOUT) to generate a valid logic-high level for microprocessor reset inputs. Without it, RESET remains floating when inactive, risking undefined MCU behavior. The datasheet confirms RESET sinks current only when asserted low, and leakage is ≤25 µA when high.

How does the ENABLE pin behave during power-up of the CS8311YD8?

During power-up, the ENABLE pin defaults to high-impedance until VIN reaches ~3 V; the internal bias circuit then activates, and ENABLE responds to applied logic levels. If ENABLE is left floating or pulled high (>1.4 V), the CS8311YD8 remains in shutdown mode with 20 µA IQ. To enable output at startup, ENABLE must be held ≤1.4 V (e.g., grounded or driven low) until regulation is established.

Is the CS8311YD8 qualified to AEC-Q100 standards?

The CS8311YD8 is designed for automotive applications and meets critical AEC-Q100 stress test requirements including operating temperature range (–40°C to +150°C), transient immunity (60 V load dump), and reverse-battery tolerance (–15 V). While the original 2001 datasheet predates formal AEC-Q100 Rev G documentation, onsemi's product change notifications and packaging data confirm qualification to AEC-Q100 Grade 1 for this SO-8 variant.