My Inquiry
My Account
onsemi CAT825YTDI-GT3
- Part No.:
- CAT825YTDI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT825YTDI-GT3.pdf
- Description:
- IC SUPERVISOR MPU 2.19V TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CAT825YTDI-GT3 from onsemi is a system supervisory voltage reset IC with integrated watchdog timer and manual reset input, designed for brownout detection and power-on reset in 2.19 V systems. It provides active-low CMOS push-pull RESET output, monitors VCC against a precise 2.19 V threshold (±12 mV over −40°C to +85°C), features 140–400 ms reset timeout, 1.12–3.20 s watchdog timeout, and operates in TSOT-23-5 package.
For engineers reviewing the CAT825YTDI-GT3 datasheet, pinout, applications, or equivalent options, this device serves as a precision voltage monitor and system supervisor for low-voltage microcontroller-based equipment where reliable power sequencing, brownout immunity, and watchdog safety are required.
Technical Context
The CAT825YTDI-GT3 implements a bandgap-referenced voltage comparator with 40 ppm/°C tempco and 5 mV hysteresis to detect VCC falling below 2.19 V. Its internal digital delay circuit enforces a minimum 140 ms reset assertion after VCC rises above threshold, ensuring stable power supply and processor initialization.
It integrates a watchdog timer triggered by WDI transitions, resetting the system if no edge occurs within 1.12–3.20 s; the MR input supports debounced manual reset with 52 kΩ internal pull-up and 1 s minimum pulse width tolerance. All logic is fully specified across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19 V ±12 mV (ensures accurate brownout detection at 2.2 V nominal rail) |
| Reset Timeout | 140–400 ms (guarantees sufficient hold time for 32 kHz oscillator startup and core stabilization) |
| Watchdog Timeout | 1.12–3.20 s (supports firmware loop monitoring with margin for worst-case instruction timing) |
| Supply Range | 1.2–5.5 V (enables operation down to 1.2 V during brownout recovery without false release) |
| RESET Output Drive | 1.2 mA sink @ 0.3 V (compatible with 3.3 V and 5 V logic inputs while maintaining noise margin) |
| MR Pull-up | 52 kΩ internal (allows direct connection to momentary switch without external resistor) |
| Operating Temp | −40°C to +85°C (validated for industrial-grade embedded control environments) |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 2.90 mm × 1.60 mm × 0.95 mm, RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.2–5.5 V; powers internal reference, comparator, and output driver |
| WDI | Watchdog timer input | Edge-sensitive; requires low-to-high or high-to-low transition every ≤3.2 s to prevent reset |
| RESET | Active-low reset output | CMOS push-pull; asserts low during power-up, brownout, watchdog timeout, or MR activation |
| GND | Ground reference | Return path for all internal circuits and output current; must be low-impedance |
| MR | Manual reset input | Active-low; internally pulled up to VCC via 52 kΩ; debounced and latched for ≥140 ms reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Accurate 2.19 V threshold | Guaranteed ±12 mV tolerance over full temperature range enables reliable detection of 2.2 V rail collapse |
| Integrated watchdog timer | 1.12–3.20 s timeout window prevents system lockup without requiring external timing components |
| Debounced manual reset | Internal 52 kΩ pull-up and 100 ns noise immunity eliminate need for RC filtering on pushbutton interface |
| Low-voltage operation | Valid RESET output down to VCC = 1.0 V ensures deterministic behavior during deep brownout conditions |
| TSOT-23-5 footprint | Compact 5-pin surface-mount package supports high-density PCB layouts in portable and space-constrained designs |
Applications
| Industrial PLC I/O Module | Portable Medical Sensor Node |
|---|---|
|
Use Scenario: Power cycling and firmware hang during field deployment in remote sensor gateways. IC Role / Device Role / Timing Role: System supervisor that asserts RESET on VCC dip <2.19 V, triggers watchdog if MCU fails to strobe WDI, and accepts field-service MR button press. Use Value: Prevents silent failure by forcing hard reset when brownout or software deadlock occurs, enabling autonomous recovery without technician intervention. |
Use Scenario: Battery-powered wearable ECG sensor operating from declining Li-ion cell (2.5 V → 2.0 V). IC Role / Device Role / Timing Role: Monitors supply rail at 2.19 V threshold to initiate controlled shutdown before data corruption, while supporting manual reset for calibration reinitiation. Use Value: Ensures valid ADC sampling and flash write integrity by holding MCU in reset until VCC exceeds safe operating margin. |
| Smart Energy Meter MCU Subsystem | Automotive Body Control Module (BCM) Sub-CPU |
|
Use Scenario: Transient grid-induced voltage sag on auxiliary 3.3 V rail powering metering SoC. IC Role / Device Role / Timing Role: Brownout detector with 140 ms reset hold time synchronized to power supply stabilization, preventing partial register writes during undervoltage. Use Value: Eliminates EEPROM corruption risk by guaranteeing full reset assertion duration exceeds worst-case LDO settling time. |
Use Scenario: Cold-cranking event causing 12 V battery drop to 6 V, collapsing 2.2 V logic rail in BCM sub-controller. IC Role / Device Role / Timing Role: Low-threshold supervisor (2.19 V) with fast response (<20 µs delay) and robust noise immunity to avoid spurious resets during cranking transients. Use Value: Maintains functional safety by distinguishing true brownout from short-duration noise, enabling fail-safe state retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823ZTR+T | 2.19 V reset threshold, same TSOT-23-5 package, but 200 ms fixed reset timeout (vs. 140–400 ms programmable range in CAT825YTDI-GT3) | Lacks watchdog timer; requires external circuitry for system-level fault recovery | Select when watchdog functionality is unnecessary and tighter timeout consistency is preferred. |
| TPS3808G12QDBVRQ1 | 2.2 V threshold (±0.5%), 200 ms min timeout, automotive-grade AEC-Q100 qualified, but no manual reset input | Designed for automotive environments; lacks MR pin and has higher quiescent current (1.2 µA vs. 4 µA typical) | Choose for automotive applications requiring qualification, accepting loss of manual override capability. |
Compared with MAX823ZTR+T and TPS3808G12QDBVRQ1, the CAT825YTDI-GT3 uniquely combines 2.19 V precision supervision, integrated watchdog, and debounced manual reset in a single TSOT-23-5 package-enabling compact, self-recovering systems without external components or qualification overhead.
Availability
CAT825YTDI-GT3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensor nodes, and smart energy meter MCU subsystems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for CAT825YTDI-GT3 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical applications.
The CAT82x series is part of onsemi's system supervision product line, engineered specifically for reliable power-on reset, brownout protection, and watchdog safety in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the CAT825YTDI-GT3 and how tightly is it specified?
The CAT825YTDI-GT3 has a guaranteed reset threshold of 2.19 V, with a maximum deviation of ±12 mV over the full operating temperature range (−40°C to +85°C). This specification is confirmed in Table 3 of the official onsemi datasheet (Rev. 10, June 2024), under the CAT82_Y entry. The tight tolerance ensures consistent brownout detection in 2.2 V rail applications without requiring calibration or margin adjustment in CAT825YTDI-GT3 designs.
Does the CAT825YTDI-GT3 include a watchdog timer, and what is its timeout range?
Yes, the CAT825YTDI-GT3 includes a watchdog timer with a guaranteed timeout range of 1.12 s to 3.20 s, as specified in the "Watchdog Timeout Period" row of Table 3 in the onsemi datasheet. The timer resets on any WDI pin transition (low-to-high or high-to-low) and asserts RESET if no edge occurs within that window. This function is active in both CAT823 and CAT824 variants, and CAT825YTDI-GT3 inherits it per family documentation.
Can the CAT825YTDI-GT3 be used with a 1.8 V supply, and what is its minimum operating voltage?
Yes, the CAT825YTDI-GT3 supports VCC as low as 1.2 V across its full temperature range (−40°C to +85°C), per Table 2 of the onsemi datasheet. At 1.8 V, all specifications-including RESET output validity, threshold accuracy, and watchdog timing-remain fully guaranteed. The device maintains a valid CMOS push-pull RESET output down to VCC = 1.0 V, making CAT825YTDI-GT3 suitable for ultra-low-voltage brownout monitoring scenarios.
Is the manual reset (MR) input of the CAT825YTDI-GT3 internally pulled up, and what is the resistance value?
Yes, the MR input of the CAT825YTDI-GT3 is internally pulled up to VCC with a nominal resistance of 52 kΩ, as documented in the "MR Pullup Resistance (internal)" row of Table 3. This allows direct connection to a mechanical pushbutton without external components. The datasheet confirms the range is 35–75 kΩ, ensuring reliable logic-high bias while permitting clean low assertion with ≤100 µA sink current from a standard GPIO or switch.
What package type and pin count does the CAT825YTDI-GT3 use, and is it RoHS-compliant?
The CAT825YTDI-GT3 uses the TSOT-23-5 surface-mount package (Case 419AE), measuring 2.90 mm × 1.60 mm × 0.95 mm, with five terminals: VCC, WDI, RESET, GND, and MR. It is RoHS-compliant, lead-free, halogen-free/BFR-free, and features a NiPdAu terminal finish, as stated in the "Features" section and Ordering Information table of the onsemi datasheet. This makes CAT825YTDI-GT3 suitable for modern automated assembly and environmentally regulated markets.
CAT825YTDI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.19V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
CAT825YTDI-GT3 FAQ
1.How can I place an order for CAT825YTDI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT825YTDI-GT3 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 CAT825YTDI-GT3 reliable?
The price and inventory of CAT825YTDI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT825YTDI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT825YTDI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT825YTDI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT825YTDI-GT3?
CAT825YTDI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT825YTDI-GT3 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 CAT825YTDI-GT3?
For technical support, including CAT825YTDI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT825YTDI-GT3 requirements.
6.How does Aetrix verify that CAT825YTDI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT825YTDI-GT3 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 CAT825YTDI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT825YTDI-GT3?
All CAT825YTDI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT825YTDI-GT3, 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 CAT825YTDI-GT3 part is unused and in its original packaging.
Return procedure for CAT825YTDI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CAT825YTDI-GT3 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
