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onsemi CAT809STBI-T3
- Part No.:
- CAT809STBI-T3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
CAT809STBI-T3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,830
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Product details
Overview
CAT809STBI-T3 from onsemi is a 3-pin SOT-23 push-pull active-low microprocessor supervisory IC monitoring +2.93 V power supplies with ±5% threshold accuracy, 140–240 ms reset timeout, and guaranteed reset validity down to VCC = 1.0 V - used in embedded control systems to ensure reliable power-on initialization.
For engineers reviewing the CAT809STBI-T3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, package mapping, real-world use cases, and validated alternative parts for industrial-grade power supply supervision.
Technical Context
The CAT809STBI-T3 implements a precision voltage reference and digital delay circuit to assert an active-low RESET signal when VCC drops below 2.93 V (±5% over −40°C to +85°C), holding it low for ≥140 ms after VCC recovers above threshold. It uses floating-gate Analog EEPROM for stable threshold calibration.
Its push-pull output drives RESET directly without external pull-up, supports transient immunity against ≤4 µs/100 mV VCC dips, and maintains defined logic state at VCC as low as 1.0 V - requiring only a 10 kΩ pull-down resistor for sub-1.0 V VCC stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±5% (S suffix); ensures reliable detection of brownout in +2.93 V systems |
| Reset Timeout | 140–240 ms; guarantees minimum reset pulse width for safe MCU boot sequencing |
| Supply Current | 6 µA typical; enables ultra-low-power operation in battery-backed or energy-sensitive designs |
| VCC Range | 1.2–5.5 V (−40°C to +85°C); supports wide input range while maintaining reset functionality |
| Output Type | Push-pull active LOW; eliminates need for external pull-up and simplifies interface to CMOS inputs |
| Reset Validity | Down to VCC = 1.0 V; allows predictable reset state during deep undervoltage conditions |
| Tempco | 30 ppm/°C; ensures <±1% threshold drift across full industrial temperature range |
Pinout & Package
Package: SOT-23 (Case 527AG), 3-pin surface-mount, Pb-free/RoHS-compliant, 1.4 mm × 2.9 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal voltage reference and output stage; must be connected to system ground plane |
| 2 | RESET | Active-low push-pull output; sinks current when asserted, sources current when deasserted; interfaces directly to MCU reset input |
| 3 | VCC | Monitored power supply input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V threshold | Guaranteed ±5% tolerance over −40°C to +85°C enables accurate brownout detection in +2.93 V rail systems |
| 140 ms minimum reset timeout | Ensures sufficient hold time for microcontrollers to complete internal power-on reset before release |
| Push-pull active-low output | Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
| VCC = 1.0 V reset validity | Allows deterministic reset behavior during severe undervoltage events, supporting fail-safe shutdown sequences |
| Transient immunity | Rejects VCC transients ≤4 µs / 100 mV amplitude, preventing false resets in noisy power environments |
Applications
| Industrial Embedded Control | Smart Metering Systems |
|---|---|
Use Scenario: Power-up sequencing in programmable logic controllers (PLCs) with isolated 3.3 V or 2.93 V I/O rails. IC Role / Device Role / Timing Role: Supervises main 2.93 V supply and asserts active-low reset to ARM Cortex-M4 MCU until stable. Use Value: Prevents firmware execution during unstable power ramp-up, eliminating lockup or corrupted register states. | Use Scenario: Reset management in electricity meters with dual-supply (3.3 V MCU + 2.93 V metrology ADC). IC Role / Device Role / Timing Role: Monitors 2.93 V metrology rail and holds MCU in reset until ADC reference stabilizes post-power-on. Use Value: Ensures synchronized startup between processing core and precision analog subsystem, avoiding measurement errors. |
| White Goods Main Control Boards | Wireless Base Station Management |
Use Scenario: Cold-start reliability in refrigerator control boards operating from switched-mode 3.0 V auxiliary supply. IC Role / Device Role / Timing Role: Provides 2.93 V supervision with 240 ms max timeout to accommodate slow capacitor charging in SMPS feedback loops. Use Value: Eliminates intermittent boot failures caused by marginal VCC rise time, improving field return rate. | Use Scenario: Reset coordination across FPGA, RF transceiver, and baseband processor in small-cell radios. IC Role / Device Role / Timing Role: Generates synchronized active-low reset pulse to all three domains using single CAT809STBI-T3 output. Use Value: Avoids domain-specific reset timing mismatches that cause bus contention or configuration race conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809STR | Same 2.93 V threshold, SOT-23 package, but higher 15 µA typical supply current and no sub-1.0 V reset validity guarantee | Valid for legacy designs where MAX compatibility is required; less suitable for ultra-low-power or deep-undervoltage scenarios | Select MAX809STR only if replacing existing MAX809-based designs with identical layout and power budget |
| TPS3808G125DBVR | 2.93 V threshold option available, but requires external capacitor for adjustable timeout (default 200 ms); 1.8 V min VCC operation | Offers programmable delay and lower quiescent current (0.6 µA), but adds component count and layout complexity | Choose TPS3808G125DBVR when adjustable timeout or sub-1 µA supply current is critical; not drop-in compatible |
Compared with MAX809STR and TPS3808G125DBVR, the CAT809STBI-T3 delivers fixed 140–240 ms timeout with 6 µA consumption and guaranteed reset assertion down to 1.0 V - making it optimal for cost-sensitive, space-constrained industrial controls needing deterministic behavior without external components.
Availability
CAT809STBI-T3 is available at Aetrix Electronics and suitable for industrial embedded control, smart metering, white goods, wireless infrastructure, and intelligent instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for CAT809STBI-T3 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT809STBI-T3 belongs to onsemi's microprocessor supervisory IC product line, engineered specifically for robust, low-cost power-on reset generation in industrial and consumer electronics with strict reliability and temperature requirements.
FAQ
What is the exact reset threshold voltage of the CAT809STBI-T3?
The CAT809STBI-T3 has a nominal reset threshold voltage of 2.93 V with ±5% tolerance over the full industrial temperature range (−40°C to +85°C). This value is confirmed by Table 1 (Threshold Suffix Selector) and Table 4 (Electrical Characteristics) in the official onsemi datasheet, where "S" suffix corresponds to 2.93 V. The device uses floating-gate Analog EEPROM to maintain threshold stability.
Does the CAT809STBI-T3 require an external pull-up resistor on the RESET pin?
No, the CAT809STBI-T3 does not require an external pull-up resistor because it features a push-pull active-low RESET output. Unlike the open-drain CAT803, the CAT809STBI-T3 actively drives both HIGH and LOW states. This is explicitly stated in the datasheet Features section and Pin Descriptions table, confirming direct interface capability with standard CMOS inputs.
What is the minimum VCC voltage at which CAT809STBI-T3 guarantees valid RESET output state?
The CAT809STBI-T3 guarantees valid RESET output state down to VCC = 1.0 V, as specified in the Features list and Detailed Descriptions section. For operation below 1.0 V, a 10 kΩ pull-down resistor from RESET to GND is recommended to ensure known logic state - a design requirement clearly documented in Figure 8 and related text.
Is CAT809STBI-T3 pin-compatible with MAX809?
Yes, the CAT809STBI-T3 is a direct replacement for MAX809 in industrial-temperature applications, as stated in the datasheet Description and Features sections. Both use identical SOT-23 pinout (GND, RESET, VCC), same 2.93 V threshold (S suffix), and push-pull active-low output. No PCB changes are required when substituting CAT809STBI-T3 for MAX809 in existing designs.
What package type and marking code does CAT809STBI-T3 use?
The CAT809STBI-T3 uses the SOT-23 package (Case 527AG) with Pb-free/Halide-free construction and is supplied in 3000-piece tape-and-reel format. Its top-marking code is "VLA", as confirmed in Table 5 (Ordering Part Number) of the datasheet - consistent across all CAT809TBI-GT3 variants regardless of threshold suffix.
CAT809STBI-T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
CAT809STBI-T3 FAQ
1.How can I place an order for CAT809STBI-T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT809STBI-T3 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 CAT809STBI-T3 reliable?
The price and inventory of CAT809STBI-T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT809STBI-T3 is usually 5 days.
3.What payment methods are accepted for CAT809STBI-T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT809STBI-T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT809STBI-T3?
CAT809STBI-T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT809STBI-T3 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 CAT809STBI-T3?
For technical support, including CAT809STBI-T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT809STBI-T3 requirements.
6.How does Aetrix verify that CAT809STBI-T3 is sourced from the original manufacturer or authorized distributors?
All CAT809STBI-T3 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 CAT809STBI-T3 meets industry standards.
7.What is the process for return or replacement of CAT809STBI-T3?
All CAT809STBI-T3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT809STBI-T3, 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 CAT809STBI-T3 part is unused and in its original packaging.
Return procedure for CAT809STBI-T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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