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STMicroelectronics ST62T20CB3
- Part No.:
- ST62T20CB3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
ST62T20CB3.pdf
- Description:
- IC MCU 8BIT 4KB OTP 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
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Product details
Overview
ST62T20CB3 from STMicroelectronics is an 8-bit OTP microcontroller with 4KB program memory, 64 bytes RAM, integrated 8-bit ADC (8-channel), dual timers (including watchdog), and oscillator safeguard. It operates from 3.0V to 6.0V across –40°C to +125°C and targets automotive body electronics, industrial sensor nodes, and appliance control panels requiring safe reset and low-power operation.
For engineers reviewing the ST62T20CB3 datasheet, ST62T20CB3 pinout, ST62T20CB3 application, or ST62T20CB3 equivalent, key selection criteria include its LVD-enabled safe reset, 20mA high-sink I/O capability, OSG-protected clock system, and OTP programmability for production firmware finalization.
Technical Context
The ST62T20CB3 implements a Harvard-architecture 8-bit CPU core with 40 instructions and 9 addressing modes. Its clock system supports crystal, RC, or external clock inputs, backed by Oscillator Safeguard (OSG) to detect and recover from clock failure and a Low-Frequency Auxiliary Oscillator (LFAO) for Stop mode wake-up.
Interrupt handling includes 4 vectors plus NMI and RESET, servicing 12 external interrupt lines mapped across two vectors. The 8-bit ADC features configurable sampling and conversion timing, while the 8-bit timer/counter integrates a 7-bit prescaler and supports auto-reload or free-running modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Program Memory | 4KB OTP - Final firmware locked at production; no field reprogramming required. |
| RAM Size | 64 bytes - Sufficient for small real-time control stacks and sensor data buffering. |
| ADC Resolution & Channels | 8-bit, 8 input channels - Enables simultaneous monitoring of multiple analog sensors (e.g., temperature, voltage, potentiometer). |
| Operating Voltage | 3.0V to 6.0V - Compatible with 5V industrial buses and battery-backed systems down to 3V. |
| Max Clock Frequency | 8 MHz - Supports deterministic real-time response in sub-100µs control loops. |
| Temperature Range | –40°C to +125°C - Qualified for under-hood automotive and industrial ambient environments. |
| I/O Sink Current | 20 mA per pin (4 pins) - Directly drives LEDs, relays, or small solenoids without external drivers. |
Pinout & Package
ST62T20CB3 is housed in a 20-pin SOIC (SO20) package with 12 multifunctional I/O lines, including 4 high-sink outputs (PA0–PA3), 8 alternate-function lines (PB0–PB7), and dedicated control pins for reset, NMI, oscillator, and power.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply / Ground | Single-supply operation; decoupling capacitor required on VDD near pin for noise immunity. |
| OSCIN / OSCOUT | Main oscillator input/output | Drives external crystal or ceramic resonator (1–8 MHz); OSG monitors oscillation integrity. |
| RESET | Active-low asynchronous reset | Hardware-initiated cold start; asserts on power-up, LVD trip, or external pull-down. |
| NMI | Non-maskable interrupt | Used for critical fault detection (e.g., overtemperature, safety watchdog timeout). |
| PA0–PA3 | Port A bidirectional I/O | 4 pins support 20mA sink - drive indicators or low-side switches directly. |
| PB0–PB7 | Port B bidirectional I/O | 8 pins with alternate functions: ADC inputs (Ain0–Ain7), timer capture, and external interrupts. |
Key Features
| Feature | Design Value |
|---|---|
| Oscillator Safeguard (OSG) | Detects main clock failure and forces safe transition to backup LFAO or reset - prevents runaway execution. |
| Low Voltage Detector (LVD) | Monitors VDD and triggers safe reset before logic corruption occurs - configurable threshold (typically 2.7V or 4.0V). |
| Two Power-Saving Modes | Wait mode halts CPU but retains RAM/peripherals; Stop mode shuts down oscillator and reduces current to <1 µA. |
| Read-Out Protection | Enables firmware IP protection by disabling external readback of OTP memory contents. |
| Watchdog Timer | Configurable timeout (1–256 ms) with windowed refresh - ensures software liveness in safety-critical tasks. |
Applications
| Automotive Body Control Module | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Centralized control of door locks, interior lighting, and mirror adjustment in 12V vehicle systems. IC Role / Device Role / Timing Role: Main MCU executing CAN/LIN gateway logic, PWM dimming, and analog sensor polling. Use Value: LVD and OSG ensure fail-safe behavior during battery voltage sag or alternator ripple; 20mA I/O drives LED status indicators directly. |
Use Scenario: Standalone wired sensor node measuring ambient temperature and reporting via RS-485. IC Role / Device Role / Timing Role: Signal acquisition and preprocessing unit - samples thermistor bridge, applies linearization, and formats serial output. Use Value: 8-channel ADC enables multi-point sensing; Stop mode extends battery life in intermittent-read applications. |
| Home Appliance Motor Controller | Smart Power Outlet Monitoring |
Use Scenario: Fan speed regulation and thermal cutoff in HVAC blower units. IC Role / Device Role / Timing Role: Closed-loop controller using ADC feedback and PWM output to drive TRIAC or MOSFET gate. Use Value: Integrated watchdog and safe reset prevent motor stall or overheating due to software hang. |
Use Scenario: Energy metering and load switching in DIN-rail mounted smart outlets. IC Role / Device Role / Timing Role: Analog front-end processor - measures AC voltage/current via shunt/resistive dividers and controls relay driver. Use Value: High-sink I/O (20mA) directly interfaces with opto-isolated relay drivers; wide VDD range accommodates auxiliary 5V or 3.3V rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST62T25CB3 | ROM-based variant (4KB ROM, no OTP programming); identical pinout and peripheral set. | No field firmware updates possible; suited for high-volume, fixed-code deployments. | Select when firmware is finalized and cost-per-unit optimization outweighs programming flexibility. |
| STM8S003F3P6 | Enhanced 8-bit core (3-stage pipeline), 8KB Flash, 1KB RAM, 10-bit ADC, and improved debug interface. | Supports larger code base, faster interrupt response, and in-circuit debugging - requires PCB redesign. | Choose for new designs needing scalability, modern toolchain support, or higher precision analog measurement. |
Compared with ST62T20CB3, the ST62T25CB3 eliminates programming infrastructure but sacrifices firmware agility, while the STM8S003F3P6 delivers significantly higher performance and integration at the cost of legacy compatibility and design continuity.
Availability
ST62T20CB3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and home appliance motor controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ST62T20CB3 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, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade components since 1987.
The ST62xx family was engineered for cost-sensitive, safety-aware embedded control in harsh environments - emphasizing robust reset architecture, analog integration, and low-power operation without external support circuitry.
FAQ
Is ST62T20CB3 still in active production?
Yes, ST62T20CB3 remains in active production per STMicroelectronics' official product status documentation (as of Q2 2024). It is not listed in ST's Product Longevity Program discontinuation notices and continues to be stocked by authorized distributors with full traceability and extended lifecycle support.
What development tools are supported for ST62T20CB3?
ST provides the ST6 Toolset, including ST6ASM assembler, ST6LINK programmer/debugger, and evaluation board ST62E20C-EVAL (EPROM version compatible with OTP timing and peripherals). Third-party tools like COSMIC C compiler also support the ST6 architecture with full register mapping and interrupt vector definitions.
Can ST62T20CB3 operate without an external crystal?
Yes - it supports internal RC oscillator (typ. 1 MHz, ±20% tolerance), external clock input (0–8 MHz), or ceramic resonator. However, OSG and LVD functionality remain fully operational only with crystal/resonator configurations; RC mode disables OSG and reduces timing accuracy for time-critical ADC or timer use cases.
How is read-out protection enabled on ST62T20CB3?
Read-out protection is activated by programming Option Byte 0x00 (ROPT) to 0x00 during OTP programming. Once set, external read attempts return invalid data and prohibit memory dump via parallel programmer. This setting is irreversible and must be verified before final programming.
ST62T20CB3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Series:
- ST6
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST6
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, WDT
- Number of I/O:
- 12
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 64 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 6V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST62T20CB3 FAQ
1.How can I place an order for ST62T20CB3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST62T20CB3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST62T20CB3 reliable?
The price and inventory of ST62T20CB3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST62T20CB3 is usually 5 days.
3.What payment methods are accepted for ST62T20CB3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST62T20CB3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST62T20CB3?
ST62T20CB3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST62T20CB3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST62T20CB3?
For technical support, including ST62T20CB3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST62T20CB3 requirements.
6.How does Aetrix verify that ST62T20CB3 is sourced from the original manufacturer or authorized distributors?
All ST62T20CB3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST62T20CB3 meets industry standards.
7.What is the process for return or replacement of ST62T20CB3?
All ST62T20CB3 units undergo pre-shipment inspection (PSI). If there is an issue with ST62T20CB3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST62T20CB3 part is unused and in its original packaging.
Return procedure for ST62T20CB3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST62T20CB3 Tags
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