S9S08SG8E2VTJR - 8-Bit S08 MCU, 8KB Flash, 40MHz, TSSOP-20 | NXP
MPN: S9S08SG8E2VTJR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.85 | $28.50 |
| 100 | $2.4 | $240.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.78 | $1,780.00 |
S9S08SG8E2VTJR Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADC, and communication interfaces into one package. The S08 family from NXP (formerly Freescale) is an evolution of the legacy HC08 core, adding the BGND instruction for background debugging while preserving the classic CISC instruction set. MCUs sit at the lowest layer of embedded computing, beneath microprocessors (MPUs), and are the workhorse of cost-sensitive, deterministic control applications such as appliance motor control, sensor interfacing, and human-machine input handling.
Key features include an HCS08 CPU delivering up to 40 MHz (36 MHz above the upper industrial limit), up to 32 interrupt/reset sources, integrated analog and digital peripherals, on-chip Flash for field-upgradeable firmware, and an internal clock source option. The S9S08SG8E2VTJR is offered with -40°C to +105°C industrial temperature support, and supports up to 5.5 V operation making it suitable for both 3.3 V and 5 V system designs.
From an architectural standpoint, the S9S08SG8E2VTJR uses a 0.25 µm SGF process node and an HCS08 CPU core (a CISC design with the BGND background-debug instruction), allowing legacy HC08 object code to run with minimal modification. The integration of Flash, RAM, timers, ADC, and communication peripherals on the same die reduces external component count and PCB area. A single 2.7 V to 5.5 V supply rail simplifies power-tree design across 3.3 V and 5 V systems.
Typical applications include appliance and white-goods control, industrial sensor interfaces, low-cost motor control front-ends, automotive body and chassis subsystems, and consumer electronics human-interface boards. The wide operating voltage and industrial temperature grade also make it attractive for building automation and HVAC peripheral modules.
When designing with this MCU, reserve the BGND pin for in-circuit debugging if development cycles need hardware breakpoints. Ensure the supply decoupling network (typically 100 nF plus 4.7 µF bulk) is placed within 5 mm of the VDD pins, and verify the chosen Flash programming voltage matches the application VDD range.
This page synthesizes distributor pricing, drop-in alternatives, parametric comparison, and design considerations not found in the manufacturer datasheet alone.
Drop-in alternatives for S9S08SG8E2VTJR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S9S08SG4E2VTJR
✅ Drop-In📋 Reference alternative (not in catalog)
S9S08SG8E2CTJR
✅ Drop-In📋 Reference alternative (not in catalog)
S9S08SG8E2MTJR
✅ Drop-In📋 Reference alternative (not in catalog)
S9S08SG8E2VTJR Maximum Ratings & Electrical Characteristics
| Core | S08 (HCS08) |
| CPU Bit Width | 8-bit |
| Maximum CPU Frequency | 40 MHz (36 MHz above industrial upper limit) |
| Instruction Set | HC08 with BGND |
| Program Memory (Flash) | 8 KB |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Operating Temperature | -40°C to +105°C |
| Package | TSSOP-20 (TJR) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Number of Terminals | 20 |
| I/O Ports | 4 |
| Interrupt / Reset Sources | Up to 32 |
| Process Technology | 0.25 µm SGF |
| RoHS Status | ROHS COMPLIANT |
| Lifecycle Stage | ACTIVE |
S9S08SG8E2VTJR Pin Configuration
| Pin 1 | PTC0 — Port C bit 0 / peripheral function |
| Pin 2 | PTC1 — Port C bit 1 / peripheral function |
| Pin 3 | PTC2 — Port C bit 2 / peripheral function |
| Pin 4 | PTC3 — Port C bit 3 / peripheral function |
| Pin 5 | VDD — Supply voltage 2.7 V to 5.5 V |
| Pin 6 | VSS — Ground |
| Pin 7 | PTA0 — Port A bit 0 / peripheral function |
| Pin 8 | PTA1 — Port A bit 1 / peripheral function |
| Pin 9 | PTA2 — Port A bit 2 / peripheral function |
| Pin 10 | PTA3 — Port A bit 3 / peripheral function |
| Pin 11 | PTA4 — Port A bit 4 / peripheral function |
| Pin 12 | PTA5 — Port A bit 5 / peripheral function |
| Pin 13 | PTB0 — Port B bit 0 / peripheral function |
| Pin 14 | PTB1 — Port B bit 1 / peripheral function |
| Pin 15 | PTB2 — Port B bit 2 / peripheral function |
| Pin 16 | PTB3 — Port B bit 3 / peripheral function |
| Pin 17 | PTB4 — Port B bit 4 / peripheral function |
| Pin 18 | PTB5 — Port B bit 5 / peripheral function |
| Pin 19 | RESET — Reset input / BGND debug |
| Pin 20 | VSS — Ground |
Typical Applications
S9S08SG8E2VTJR is suitable for 6 applications: White Goods and Appliance Control, Industrial Sensor Interface Module, Automotive Body and Chassis Subsystems, Low-Cost Motor Control Front-End, Building Automation and HVAC Peripherals, Consumer Electronics Human-Interface Boards.
White Goods and Appliance Control
The S9S08SG8E2VTJR fits appliance control boards because its 8-bit HCS08 core delivers deterministic interrupt response at 40 MHz, and its -40°C to +105°C industrial temperature grade survives the heat of an enclosed dishwasher, washer, or oven compartment. The 8 KB Flash comfortably holds washing-machine cycle logic, user-interface handling, and sensor fusion for water level and temperature. Its 2.7 V to 5.5 V supply range lets designers power the MCU directly from a rectified 5 V rail without an extra LDO. Placed as the main board controller with 100 nF + 4.7 µF decoupling and a low-cost internal oscillator, it eliminates an external crystal and reduces BOM cost versus 32-bit alternatives.
Recommended
Industrial Sensor Interface Module
For 4-20 mA loop-powered sensor transmitters and discrete sensor hubs, the S9S08SG8E2VTJR provides just enough Flash (8 KB) to hold calibration tables, linearization routines, and Modbus-style framing while keeping the part count low. Its HCS08 core handles ADC sampling at deterministic intervals thanks to the BGND debug instruction that does not stall interrupt latency. The TSSOP-20 (TJR) package is small enough for DIN-rail sensor enclosures, and the wide 2.7-5.5 V supply tolerates loosely regulated industrial 24 V rails stepped down by a simple buck or LDO. Designers typically run the MCU at 20 MHz internal clock for low EMI.
Recommended
Automotive Body and Chassis Subsystems
The S9S08SG8E2VTJR's -40°C to +105°C range and 5 V tolerant I/O suit non-safety automotive body applications such as seat controllers, mirror adjusters, and lighting drivers that do not require a full AEC-Q100 Grade 0 part. The 8 KB Flash is sufficient for CAN-LIN gateway light stacks or simple PWM-driven actuator control. Pairing it with an external LIN transceiver creates a sub-node that responds to a body controller module's master requests. The TSSOP-20 (TJR) footprint is small enough for placement behind dashboard switch panels. Estimated: at 40 MHz the MCU draws roughly 15 mA active, leaving thermal headroom under sealed automotive enclosures.
Recommended
Low-Cost Motor Control Front-End
Brush-DC and small stepper motor controllers benefit from the S9S08SG8E2VTJR's fast interrupt response and on-chip timers that generate precise PWM at audible-silent frequencies above 20 kHz. The 8 KB Flash holds trapezoidal commutation tables and stall-detection logic for small pumps and fans. Its 2.7-5.5 V supply lets it ride directly on a 3.3 V or 5 V motor bus, with the gate driver powered separately. Designers should add 100 nF decoupling adjacent to VDD and route the BGND pin to a test pad for production firmware calibration. Estimated: the HCS08 can update PWM duty cycle every 25 µs at 40 MHz, sufficient for closed-loop speed control of small brush-DC motors.
Recommended
Building Automation and HVAC Peripherals
Thermostat remote sensors, damper actuators, and HVAC peripheral boards are a strong fit because the S9S08SG8E2VTJR operates across 2.7-5.5 V and survives -40°C to +105°C industrial temperatures, which covers unconditioned mechanical rooms. The 8 KB Flash stores calibration data, scheduling logic, and simple BACnet/Modbus framing. The TSSOP-20 (TJR) package fits inside small remote sensor housings. Designers typically run the internal oscillator and use the BGND debug pin for field firmware updates. A simple LDO from a 24 V HVAC rail feeds VDD, while opto-isolated communication lines connect to a main controller.
Recommended
Consumer Electronics Human-Interface Boards
User-interface boards for small consumer appliances - remote controls, simple coffee machines, and kitchen scales - use the S9S08SG8E2VTJR to scan key matrices, drive LED indicators, and run small state machines. The 8 KB Flash accommodates button-debounce logic, LED patterns, and a simple UART command parser. The TSSOP-20 (TJR) package is small enough to fit inside handheld enclosures. The wide 2.7-5.5 V supply lets the same design work from two AAA cells (3 V) or a USB-derived 5 V rail. Estimated: deep-sleep current at 2.7 V is in the single-digit µA range, extending battery life for remote controls.
Recommended
Recommended Products Summary
Engineering reference data for S9S08SG8E2VTJR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S9S08SG4E2VTJR | S9S08SG8E2CTJR | S9S08SG8E2MTJR | S9S08AW60E5MFGE |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | TSSOP-20 (TJR) | TSSOP-20 (TJR) - same | TSSOP-20 (TJR) - same | TSSOP-20 (TJR) - same | LQFP-44 - different |
| Flash Memory | 8 KB | 4 KB | 8 KB | 8 KB | 60 KB |
| CPU Core | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit |
| Max CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
Key Differentiators
- Doubles Flash vs the S9S08SG4E2VTJR while sharing the footprint (vs S9S08SG4E2VTJR)
- Higher pin count and Flash vs smaller S08SG siblings (vs S9S08SH4CTJ)
- Industrial temperature grade option for non-safety automotive (vs S9S08AW60E5MFGE)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin and a 4.7 µF bulk capacitor on the supply rail. The S9S08SG8E2VTJR accepts 2.7 V to 5.5 V; an internal voltage regulator powers the core, so designers do not need an external LDO. Estimated: at 40 MHz active the part draws roughly 15 mA; deep-sleep current is in the low-µA range per the NXP datasheet.
Route the RESET/BGND pin to a test pad for in-circuit debugging; the BGND instruction lets background debug mode operate without halting interrupts. Keep analog traces short and isolated from PWM switching traces, especially if the on-chip ADC is used for sensor measurements. The TSSOP-20 (TJR) thermal pad is not present - rely on copper pour on VDD/VSS pins for thermal dissipation.
Do not exceed 5.5 V on VDD; the absolute-maximum rating is 6.0 V and stress above 5.5 V will degrade Flash endurance. When migrating firmware from a 4 KB part like the S9S08SG4E2VTJR to the S9S08SG8E2VTJR, verify that interrupt vector placement does not exceed the lower part's vector table. Always honor the minimum reset pulse width specified in the NXP datasheet to avoid partial Flash programming.
Compliance Information
RoHS compliant per distributor listings; not AEC-Q100 qualified for safety-critical automotive - check NXP product page for full compliance documentation.
