NXP Semiconductors MC9S08QL4CTJ

Overview

MC9S08QL4CTJ from NXP Semiconductors is an 8-bit HCS08 microcontroller designed for ultra-low-power embedded control in space-constrained applications. It delivers 20 MHz CPU operation across 1.8–3.6 V, integrates 4 KB flash and 256 B RAM, features a 12-bit ADC with temperature sensor, and supports stop3 mode with 0.45 µA typical current at 3 V/25 °C - enabling battery-powered sensor nodes and smart peripherals.

For engineers reviewing the MC9S08QL4CTJ datasheet, MC9S08QL4CTJ pinout, MC9S08QL4CTJ application, or MC9S08QL4CTJ equivalent, this page provides verified technical context, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The MC9S08QL4CTJ implements the HCS08 CPU core with BGND instruction support and handles up to 32 interrupt/reset sources. Its clock system combines a low-power external oscillator (31.25 kHz–16 MHz) and an internal FLL-based ICS offering ±0.2% trimming resolution and 2% deviation over voltage/temperature - enabling precise bus frequencies from 1–10 MHz without external crystals.

System protection includes COP reset (with 1 kHz internal clock option), programmable low-voltage detection (1.80–1.96 V threshold), illegal opcode/address detection, and flash block protection. Peripheral integration includes SCI with LIN master/slave capability, RTC with free-running 1 kHz LPO, and ACMP output routable to TPM input capture - all operable in stop3 mode.

Key Specifications

Pinout & Package

MC9S08QL4CTJ is housed in a 20-pin TSSOP package (Case 948E), with 18 GPIOs, dedicated BKGD/MS debug pin, RESET/IRQ/TCLK multiplexed on PTA5, and dual power/ground pins for noise resilience.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with S9KEAZ128AMLH and MC9RS08LA8, the MC9S08QL4CTJ uniquely balances ultra-low-power stop-mode operation (0.45 µA), integrated RTC with LPO, and analog comparator with TPM capture - making it optimal for battery-operated, event-driven control where minimal active current and analog timing precision are critical.

Availability

MC9S08QL4CTJ is available at Aetrix Electronics and suitable for smart sensor nodes, automotive body control modules, industrial timers, and portable medical devices requiring stable component supply across long production lifecycles.

Supply support for MC9S08QL4CTJ 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The MC9S08QL4CTJ belongs to the QL-series of ultra-low-power HCS08 MCUs, engineered specifically for cost-sensitive, battery-operated embedded systems demanding sub-microamp sleep current and integrated analog peripherals.

FAQ

What is the maximum operating frequency of the MC9S08QL4CTJ?

The MC9S08QL4CTJ supports up to 20 MHz CPU operation across its full 1.8–3.6 V supply range and –40 °C to +85 °C temperature range. Its bus frequency is limited to 10 MHz when using the internal clock source (ICS) with FLL enabled. This balance of speed and low-voltage operation makes the MC9S08QL4CTJ suitable for both performance-critical and energy-constrained applications without requiring voltage scaling.

Does the MC9S08QL4CTJ support LIN communication?

Yes, the MC9S08QL4CTJ includes a Serial Communication Interface (SCI) module with native LIN 2.x master and slave capability, including extended break generation and detection. This allows direct connection to standard LIN transceivers without protocol translation firmware. The MC9S08QL4CTJ leverages its internal clock accuracy and low-jitter DCO to meet LIN timing requirements, making it suitable for automotive body electronics and distributed sensor networks.

What are the key low-power features of the MC9S08QL4CTJ?

The MC9S08QL4CTJ offers multiple low-power modes including Stop2 (0.25 µA typical) and Stop3 (0.45 µA typical at 3 V/25 °C), with 6 µs wakeup time from Stop3. It supports peripheral clock gating, low-power run/wait modes, and a dedicated 1 kHz low-power oscillator for RTC operation during sleep. These features enable multi-year battery life in intermittent-sampling applications - a core design objective validated across the QL-series product line.

Can the MC9S08QL4CTJ operate without an external crystal?

Yes, the MC9S08QL4CTJ can operate entirely from its internal clock source (ICS), which uses a frequency-locked loop (FLL) with factory-trimmed 32.768 kHz reference. The ICS supports bus frequencies from 1–10 MHz and achieves ±0.2% resolution at fixed voltage/temperature. External crystals are optional and only required when higher timing precision (e.g., for LIN or RTC synchronization) is needed - reducing BOM cost and board space in cost-sensitive designs.

What debug interface does the MC9S08QL4CTJ provide?

The MC9S08QL4CTJ features a single-wire Background Debug Mode (BDM) interface using the PTA4 pin (BKGD/MS). This allows full in-circuit debugging, flash programming, and real-time register inspection without requiring JTAG headers or additional pins. The interface is supported by NXP's CodeWarrior IDE and compatible third-party tools, enabling rapid development and field firmware updates - a key enabler for resource-constrained embedded projects.