S9S08SG8E2CTJ - 8-bit S08 MCU 8KB Flash 40MHz | NXP
MPN: S9S08SG8E2CTJ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.98 | $19.80 |
| 100 | $1.82 | $182.00 |
| 500 | $1.65 | $825.00 |
| 1,000 | $1.48 | $1,480.00 |
S9S08SG8E2CTJ Overview
An 8-bit microcontroller (MCU) is an integrated circuit that combines a processor core, program memory, data memory, and peripheral functions on a single chip. Within the system hierarchy, it belongs to the embedded processor family: microcontroller unit (MCU) -> embedded processor -> semiconductor. The S08 architecture from NXP (originally Freescale Semiconductor) is an entry-level to mid-range 8-bit core widely used in cost-sensitive embedded control.
Key features of the S9S08SG8E2CTJ include 8KB (8K x 8) of Flash program memory, 512 bytes of on-chip RAM, and a rich connectivity set: I2C, LINbus, SCI, and SPI serial interfaces. On-chip peripherals include a low-voltage detector (LVD), power-on reset (POR), PWM capability, and a watchdog timer (WDT), reducing external component count in compact designs.
Technically, the SG family was designed by NXP for LIN slave nodes, general-market embedded control, high-temperature operation (up to 150C ambient in some family grades), and space-constrained applications. The automotive qualification makes it suitable for body electronics and in-vehicle nodes where AEC-grade reliability screening is expected. The 16 available I/O pins and 20-TSSOP footprint allow dense, low-cost PCB layouts.
Typical applications include LIN slave modules in vehicles, door and seat controllers, small appliance control, motor-assist fan control, and general-purpose sensor interfacing. The LINbus support is a primary reason automotive tier-one suppliers selected this family.
A key design consideration: NXP has marked this part End of Life (EOL), so new designs should plan for last-time-buy quantities or a pin-compatible migration path within the S08SG/S08 families, and verify current stock with distributors.
This page synthesizes distributor pricing, verified specifications, drop-in alternative options, and practical design notes not found in a single manufacturer source.
Drop-in alternatives for S9S08SG8E2CTJ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with S9S08SG8E2CTJ (same form factor and footprint) — differing in Package, Core Processor, Operating Temperature, Program Memory Size, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S9S08SG8E2WTG
✅ Drop-In📋 Reference alternative (not in catalog)
S9S08SG8E2MTGR
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08SL16CTJ
✅ Drop-In✓ In Stock
$1.83 / Unit
View Datasheet →S9S08SG8E2CTJ Maximum Ratings & Electrical Characteristics
| Core Processor | S08 |
| Core Size | 8-Bit |
| Maximum Clock Speed | 40 MHz |
| Program Memory Size | 8KB (8K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 512 x 8 (512 B) |
| EEPROM | - |
| Connectivity | I2C, LINbus, SCI, SPI |
| Peripherals | LVD, POR, PWM, WDT |
| Number of I/O | 16 |
| Operating Temperature | -40C to +85C |
| Qualification | Automotive Qualified |
| Package | 20-TSSOP |
| Mounting Type | Surface Mount |
| ADC Resolution | 10-bit |
| Series | S08SG |
S9S08SG8E2CTJ 20-tssop Pin Configuration Guide
Pin configuration for S9S08SG8E2CTJ (20-tssop package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for S9S08SG8E2CTJ.
Refer to the datasheet for full pin configuration.
Typical Applications
S9S08SG8E2CTJ is suitable for 6 applications: Automotive LIN Slave Nodes, General Embedded Control, Space-Constrained Designs, Sensor Interfacing and Monitoring, High-Temperature Industrial Control, Legacy Automotive Module Service and Repair.
Automotive LIN Slave Nodes
The S9S08SG8E2CTJ was explicitly designed by NXP for LIN slave applications, pairing its SCI interface configured for LINbus with an external LIN transceiver to form a complete slave node. The automotive qualification and -40C to +85C operating range meet typical in-vehicle environmental requirements, while the 40 MHz S08 core comfortably handles LIN 2.x frame processing at up to 19.2 kbps. With 8KB Flash and 512B RAM, the device stores the LIN LDF-generated schedule tables, node configuration, and application logic for door modules, seat controllers, mirror adjusters, and sensor nodes. The watchdog timer and low-voltage detector add the fault tolerance expected in body electronics, making it a proven choice for legacy module service and repair builds.
Recommended
General Embedded Control
For general-market embedded control, the S9S08SG8E2CTJ offers a balanced feature set: 40 MHz S08 core, 8KB Flash, 512B RAM, 16 I/O pins, and I2C, SPI, and SCI serial links in a compact 20-TSSOP package. The integrated 10-bit ADC supports sensor reading such as temperature, potentiometer position, and current-sense monitoring without an external converter. On-chip PWM outputs drive small motors, fans, LEDs, and actuators directly, while the watchdog timer (WDT) and power-on reset (POR) ensure autonomous recovery from fault conditions. Its low pin count and surface-mount TSSOP body keep PCB area and assembly cost minimal, which matters in high-volume consumer and light-industrial products like small appliances, chargers, and controllers.
Recommended
Space-Constrained Designs
NXP positioned the S08SG family for space-constrained applications, and the S9S08SG8E2CTJ's 20-pin TSSOP package is a key enabler: the fine-pitch surface-mount body fits dense PCBs where DIP or larger QFP parts cannot. The 16 usable I/O pins provide sufficient connectivity for button matrices, LED indicators, and serial links in compact enclosures such as handheld devices, keypads, and small sensor pods. Because LVD, POR, PWM, and WDT peripherals are integrated, designers avoid external supervisor and timer chips, saving board area and bill-of-material cost. The 8KB Flash supports protocol stacks and modest application logic in a single chip, eliminating the need for external memory in space-limited layouts.
Recommended
Sensor Interfacing and Monitoring
The integrated 10-bit ADC of the S9S08SG8E2CTJ makes it well suited to analog sensor interfacing: temperature sensors, ratiometric potentiometers, pressure bridges with amplification, and current-sense outputs can be sampled directly and processed by the 40 MHz S08 core. SPI and I2C ports connect digital sensors such as accelerometers or EEPROMs when higher resolution is needed, while SCI links results to a host or display. The 512B RAM buffers sample windows for simple filtering such as moving-average or threshold detection, and PWM outputs close control loops for heaters, fans, or valves. The low-voltage detector guarantees reliable ADC operation during supply brownouts, an important trait in battery-powered and automotive monitoring nodes.
Recommended
High-Temperature Industrial Control
NXP notes that the S08SG family targets high-temperature applications, with certain family grades rated up to 150C ambient; the S9S08SG8E2CTJ variant itself is specified from -40C to +85C, so designers requiring higher ambient grades should verify the exact ordering suffix. Within its rated range, the device suits industrial environments such as motor control boards, HVAC actuators, and under-hood-adjacent modules where heat soak raises local PCB temperatures. The LVD and POR ensure deterministic startup across temperature transients, the WDT guards against firmware lockups in unattended equipment, and PWM outputs drive fans and heaters with closed-loop control via the 10-bit ADC. Its automotive qualification heritage adds screening rigor valued in industrial deployments.
Recommended
Legacy Automotive Module Service and Repair
Because the S9S08SG8E2CTJ is End of Life, its most active demand today comes from legacy automotive module service, electronic control unit (ECU) repair, and remanufacturing programs that must keep older body-electronics designs in the field. The device matches the original Freescale/NXP BOM used in door modules, window lifters, and lighting controllers, so a genuine S9S08SG8E2CTJ restores full function including the LIN slave communication and the 10-bit ADC feedback paths. XAIPART and authorized excess channels such as Rochester Electronics supply verified original parts for these repair builds. For long-term sustainment, buyers should qualify the S9S08SG8E2WTG or MTG package variants and lock in last-time-buy inventory before remaining stock is exhausted.
Recommended
Recommended Products Summary
Engineering reference data for S9S08SG8E2CTJ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S9S08SG8E2WTG | S9S08SG8E2MTGR | MC9S08SL16CTJ |
|---|---|---|---|---|
| Package | 20-TSSOP | 20-TSSOP family variant | 20-TSSOP family variant | 20-TSSOP |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | S08 8-bit, 40 MHz | S08 8-bit, 40 MHz | S08 8-bit, 40 MHz | S08 8-bit |
| Flash Memory | 8KB (8K x 8) | 8KB | 8KB | 16KB |
| Lifecycle Status | EOL (per NXP) | Same S08SG family - verify EOL status | Same S08SG family - verify EOL status | Verify current status with NXP |
Key Differentiators
- Identical S08SG silicon in same package family (vs S9S08SG8E2WTG)
- Double the flash in same 20-TSSOP pin count (vs MC9S08SL16CTJ)
- Purpose-built LIN slave support (vs Generic 8-bit MCUs)
Design Notes
The S9S08SG8E2CTJ is End of Life per NXP, with a published Product Change Notice and discontinuance schedule. Before committing a repair or production build, confirm remaining stock at DigiKey, Mouser, LCSC, and Rochester Electronics, and qualify at least one same-family alternate (S9S08SG8E2WTG or S9S08SG8E2MTGR) as a second source. Lock last-time-buy quantities early - broker pricing on EOL MCUs typically doubles or triples once distributor stock depletes.
This S08SG MCU includes an integrated low-voltage detector (LVD) and power-on reset (POR). Decouple VDD with a 0.1 uF ceramic capacitor placed within a few millimeters of the power pin, plus a bulk 4.7-10 uF capacitor near the module supply entry. Consult the S08SG family datasheet on nxp.com for the exact supply voltage range and LVD trip thresholds - the retrieved data does not state the VDD range, so verify before finalizing the power tree.
The 20-TSSOP footprint (CTJ suffix) is pitch-sensitive: the same die ships in multiple package variants across the S08SG family (CTJ, WTG, MTG suffixes), and not all variants share identical body size or pin pitch. Before swapping an alternative onto an existing PCB, compare the mechanical drawing of both orderable parts in the NXP datasheet - footprint mismatch is the most common failure mode when cross-referencing EOL S08 parts. Also route the BKGD programming pin to a header for in-circuit flash reprogramming during service.
Compliance Information
Distributor and NXP descriptions state 'Automotive Qualified' for this part. RoHS/REACH/lead-free status was not stated in the retrieved data - confirm on the NXP product page Environmental section. Automotive qualification targeting confirmed; explicit AEC-Q100 certification not stated in retrieved data.
