onsemi CS8311YDR8

Overview

CS8311YDR8 from onsemi is a micropower 10 V, ±4.0% low-dropout linear regulator with active RESET and ENABLE control, delivering up to 100 mA output current with 400 mV typical dropout at full load. It features 100 µA quiescent current in active mode, 20 µA in shutdown, and operates across –40°C to +150°C junction temperature for automotive power-rail conditioning.

For engineers reviewing the CS8311YDR8 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.0 V minimum functional RESET threshold, ±4.0% output accuracy over temperature, 60 V peak transient survivability, SO-8 package thermal resistance (R_ΘJA = 165°C/W), and integrated reverse-battery/short-circuit/thermal protection.

Technical Context

The CS8311YDR8 integrates a bandgap reference, error amplifier, and NPN pass transistor in a monolithic SO-8 layout. Its RESET comparator operates independently with hysteresis (50–200 mV) and remains valid down to V_OUT = 1.0 V, enabling reliable microprocessor reset assertion during brownout or startup.

ENABLE logic toggles the output pass transistor via a voltage-threshold interface (1.4 V typ high threshold, 0.6 V typ low threshold), reducing quiescent current to 20 µA in sleep mode. Overvoltage shutdown activates at ≥30 V input, and thermal protection reduces current above 180°C junction temperature.

Key Specifications

Pinout & Package

CS8311YDR8 is housed in an SO-8 (D suffix, Case 751) surface-mount package with 1.27 mm pitch, 5.0 mm × 4.0 mm body, and 1.75 mm max height. Thermal resistance is R_ΘJA = 165°C/W (typ) and R_ΘJC = 45°C/W (typ).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TLV70710PDQNR and TPS7B6750QPWPRQ1, the CS8311YDR8 uniquely delivers 10 V output with integrated RESET/ENABLE in SO-8, making it the sole option for automotive 10 V analog subsystems requiring single-chip fault-aware power management.

Availability

CS8311YDR8 is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and ADAS camera modules requiring stable component supply across extended temperature and high-reliability environments.

Supply support for CS8311YDR8 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 power and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The CS8311YDR8 belongs to onsemi's SMART REGULATOR® family - engineered specifically for automotive power management with integrated protection, reset, and enable functionality in compact packages.

FAQ

What is the minimum input voltage required for CS8311YDR8 to regulate 10 V output?

The CS8311YDR8 requires VIN ≥ 11 V to maintain regulation, as specified in its electrical characteristics table. Below 11 V, dropout behavior dominates and output voltage drops linearly with input. The 400 mV typical dropout at 100 mA means that at VIN = 10.4 V, VOUT will fall below 10 V - so 11 V is the practical minimum for guaranteed 10 V regulation across temperature and load.

Can CS8311YDR8 be used with ceramic output capacitors?

No - the CS8311YDR8 requires an output capacitor with sufficient ESR (e.g., aluminum or tantalum electrolytic) for stability. Ceramic capacitors with near-zero ESR can cause oscillation due to phase margin loss in the internal control loop. The datasheet explicitly recommends 10 µF aluminum electrolytic or tantalum for COUT, and warns against film or ceramic types unless ESR is artificially increased.

How does the RESET function behave during power-up of CS8311YDR8?

During power-up, the CS8311YDR8 asserts RESET (low) until VOUT rises to within 1.0 V of its regulated value (i.e., ≥9.0 V). Once VOUT exceeds the rising threshold V_RH = 9.00 V, RESET deasserts. Hysteresis (≥50 mV) prevents chatter if VOUT dips slightly post-startup. This behavior is independent of ENABLE state and remains valid even if VOUT later falls to 1.0 V.

What is the maximum allowable power dissipation for CS8311YDR8 in SO-8 package?

Using R_ΘJA = 165°C/W and maximum junction temperature T_J(max) = 150°C, the CS8311YDR8 can dissipate up to 545 mW at 25°C ambient (PD = (150 – 25)/165). At full 100 mA load with 14 V input, power dissipation is (14 – 10) × 0.1 + 0.0001 × 14 ≈ 401 mW - within safe limits. Higher input voltages or elevated ambient temperatures require derating or heatsinking.

Is CS8311YDR8 pin-compatible with other onsemi regulators like CS8312 or CS8313?

No - CS8311YDR8 has a unique pinout optimized for its VOUTSense and RESET functions. CS8312 and CS8313 are different devices (e.g., adjustable or different output voltages) with incompatible pin assignments. The SO-8 footprint is shared, but direct replacement would cause incorrect connections - especially for VOUTSense (pin 2) and RESET (pin 5), which have no equivalents in those variants.