onsemi CS8271YN8

Overview

CS8271YN8 from onsemi is an adjustable micropower linear voltage regulator in DIP-8 package, delivering 100 mA output current with 600 mV max dropout at full load, 60 µA typical quiescent current in active mode, and ENABLE-controlled shutdown drawing only 50 µA. It supports 5.0 V to 12 V adjustable output and withstands +60 V load dump transients - ideal for automotive battery-powered systems requiring fault resilience and low standby power.

For engineers reviewing the CS8271YN8 datasheet, pinout, applications, or equivalent options, key selection criteria include its adjustable output range, 60 µA quiescent current, ENABLE logic compatibility, thermal/overvoltage/reverse-battery protection, and DIP-8 footprint suitability for prototyping and legacy automotive control modules.

Technical Context

The CS8271YN8 integrates a bandgap reference, error amplifier, current-limited pass transistor, and protection circuitry including overvoltage shutdown (triggers at 30–38 V), thermal limit (150–210 °C), and reverse-battery tolerance (–15 V). Its feedback loop uses an external resistor divider on the Adj pin with 1.246–1.297 V reference voltage and ≤500 nA adjustment pin bias current.

Control logic centers on the ENABLE pin: logic-high (>2.0 V) forces sleep mode with <75 µA quiescent draw, while logic-low enables regulation. Protection responses are autonomous - no external components required for +60 V load dump survival, short-circuit current limiting (105–300 mA), or thermal shutdown.

Key Specifications

Pinout & Package

DIP-8 package (Case 626), through-hole mounting, 0.3" wide body, 0.1" lead pitch. RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2931Z-5.0/NOPB and TLV71712PDQNR, the CS8271YN8 uniquely combines adjustable output (5–12 V), ENABLE control, +60 V load dump tolerance, and –15 V reverse-battery rating - making it the sole option for robust, flexible 12 V automotive LDO applications requiring both programmability and AEC-Q100-level stress resilience.

Availability

CS8271YN8 is available at Aetrix Electronics and suitable for automotive body electronics, industrial telematics gateways, and commercial vehicle lighting controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CS8271YN8 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, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The CS8271YN8 belongs to onsemi's Smart Regulator® family - engineered specifically for automotive and harsh-environment applications demanding integrated protection, micropower operation, and wide-input-voltage resilience.

FAQ

What is the maximum input voltage the CS8271YN8 can handle during load dump events?

The CS8271YN8 is rated to survive +60 V transient load dump events at the VIN pin, as confirmed in the Absolute Maximum Ratings table and Circuit Description section. This capability allows direct integration into 12 V automotive systems without external clamping components. The device autonomously shuts down output when VIN exceeds ~34 V (typical overvoltage threshold), then recovers once voltage returns to safe levels. This behavior is intrinsic to the CS8271YN8 silicon design and does not require external circuitry.

Can the CS8271YN8 be used to generate a 7.5 V output, and what resistor values are needed?

Yes, the CS8271YN8 supports 7.5 V output using external resistors R1 (VOUT-to-Adj) and R2 (Adj-to-GND). With VREF = 1.272 V (typ), the formula VOUT = VREF × (1 + R1/R2) yields R1/R2 ≈ 4.90. For example, R2 = 10 kΩ and R1 = 49.0 kΩ achieves 7.5 V. The CS8271YN8's ≤500 nA Adj pin current ensures minimal error from resistor-divider loading, and the application note confirms this configuration is validated for stability with standard capacitor choices.

Does the CS8271YN8 require an output capacitor, and what type is recommended?

Yes, the CS8271YN8 requires a minimum 10 µF output capacitor (COUT) for loop stability, as specified in Figure 4 and Application Notes. Tantalum or aluminum electrolytic capacitors are recommended due to their sufficient ESR (≥0.5 Ω); ceramic or film capacitors with near-zero ESR may cause oscillation. The CS8271YN8 datasheet explicitly warns against using low-ESR types without compensation, and validates 10 µF aluminum electrolytic as the baseline solution for most operating conditions.

How does the ENABLE pin function on the CS8271YN8, and what is its input current?

The ENABLE pin on the CS8271YN8 is an active-high logic input: applying >2.0 V (typ) disables the pass transistor and places the CS8271YN8 in sleep mode, reducing quiescent current to ≤75 µA. Input current is ≤50 µA at 5.0 V, allowing direct drive from MCU GPIOs without buffering. When ENABLE is pulled low (<1.15 V), regulation resumes. This behavior is electrically characterized in the Electrical Characteristics table and forms part of the CS8271YN8's core control architecture.

Is the CS8271YN8 pin-compatible with other regulators, and which ones?

The CS8271YN8 is pin-compatible with the National Semiconductor LM2931 in DIP-8 package, as stated in the introductory paragraph and ordering information table. Both share identical pin 1 (VOUT), pin 2 (GND), pin 4 (Adj), pin 5 (ENABLE), pin 8 (VIN) assignments. However, the LM2931 lacks ENABLE functionality and offers only fixed outputs (e.g., LM2931Z-5.0), so direct substitution is limited to non-adjustable, non-sleep applications. No other pin-compatible alternatives are documented for the CS8271YN8.