STMicroelectronics STNRG328A

Overview

STNRG328A from STMicroelectronics is a digital controller IC for AC-DC and DC-DC power conversion systems, integrating an STM8® microcontroller core, six SMED-based PWM generators (10 ns event detection, 1.3 ns resolution), four analog comparators (<50 ns propagation), and a 10-bit ADC with 12-bit equivalent resolution via programmable gain. It operates across –40 °C to 105 °C and targets high-efficiency server PSUs and telecom rectifiers.

For engineers reviewing the STNRG328A datasheet, STNRG328A pinout, STNRG328A application, or STNRG328A equivalent, this page delivers verified technical context on SMED timing control, analog sensing architecture, low-power mode behavior, and I/O multiplexing-critical for digital power design validation and firmware integration.

Technical Context

The STNRG328A implements a dual-domain architecture: a deterministic real-time SMED subsystem handles ultra-fast PWM generation and event-driven control (e.g., overcurrent shutdown in <10 ns), while the STM8® CPU manages higher-layer sequencing, communication, and calibration. The 96 MHz PLL feeds both domains with synchronized clocking.

Its analog front-end integrates four comparators with configurable hysteresis and up to four external reference inputs, enabling independent voltage/current fault detection paths. The 10-bit ADC supports 8-channel sequencing, 1 MΩ input impedance, and x1/x4 programmable gain-optimized for isolated feedback signal conditioning without external op-amps.

Key Specifications

Pinout & Package

TSSOP38 package with exposed thermal pad; 38-pin surface-mount footprint optimized for compact power supply PCB layouts and thermal dissipation in high-density designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital power controller applications.

Compared with UCC2897A and ICE2PCS01, the STNRG328A uniquely integrates real-time SMED PWM, analog sensing, and MCU firmware in one TSSOP38 device-enabling unified control of multi-stage power conversion without external coordination logic or signal conditioning components.

Availability

STNRG328A is available at Aetrix Electronics and suitable for server power supplies, telecom rectifiers, industrial UPS systems, and LED driver modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STNRG328A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, and automotive-grade ICs with broad industrial qualification.

The STNRGxxx series is designed specifically for digitally controlled AC-DC and isolated DC-DC power conversion, emphasizing real-time event handling, analog integration, and firmware extensibility in compact packages.

FAQ

What is the maximum operating frequency of the internal PLL?

The STNRG328A features a 96 MHz PLL that serves as the primary clock source for both the STM8® CPU and the SMED subsystem. This frequency is fixed and factory-trimmed; it cannot be reconfigured beyond 96 MHz. The PLL locks to the internal 16 MHz RC oscillator or an external crystal input, providing jitter-controlled timing essential for high-resolution PWM generation.

Does the STNRG328A support DALI protocol natively?

Yes-the STNRG328A integrates a dedicated DALI transceiver module compliant with IEC 62386-102, including noise rejection filtering, configurable baud rate, and hardware-level message framing. It supports both master and slave roles and requires no external transceiver IC or level-shifting components for standard DALI-2 lighting control interfaces.

How many independent PWM outputs can be generated simultaneously?

The STNRG328A supports up to six independent PWM outputs via its SMED subsystem. Each SMED unit can operate in single, coupled, or two-coupled mode-enabling configurations such as three-phase interleaved PFC (3x2 outputs), dual LLC half-bridges (2x2), or full-bridge inverter control (4 outputs + 2 sync). All outputs are hardware-timed with sub-nanosecond jitter.

Is the E2PROM memory suitable for storing calibration data across temperature?

Yes-the 1 Kbyte true data E2PROM is rated for 100 kcycles endurance at 85 °C and guarantees 15-year data retention at that temperature. It includes built-in ECC and write-protection mechanisms, making it suitable for storing factory-calibrated ADC offsets, comparator thresholds, and thermal compensation coefficients in mission-critical power systems.