My Inquiry
My Account
onsemi CAT812LTBI-T3
- Part No.:
- CAT812LTBI-T3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
CAT812LTBI-T3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CAT812LTBI-T3 from ON Semiconductor is a 4-pin SOT-143 microprocessor power supply supervisor with active HIGH reset output, 4.63 V ±5% threshold, 140–400 ms reset timeout, and 6–20 µA supply current over -40°C to +85°C. It monitors +5.0 V supplies in embedded control systems and provides manual reset input for system-level recovery.
For engineers reviewing the CAT812LTBI-T3 datasheet, pinout, applications, or equivalent options, key selection criteria include reset polarity compatibility, VCC operating range down to 1.2 V, industrial temperature rating, and SOT-143 footprint constraints in space-constrained designs.
Technical Context
The CAT812LTBI-T3 implements a precision voltage reference and comparator-based reset generator with digital delay logic to ensure minimum 140 ms reset assertion after VCC rises above 4.63 V. Its push-pull RESET output drives high actively and remains valid down to VCC = 1.2 V.
It features internal 20 kΩ MR pull-up, 10 µs minimum MR pulse width, and immunity to transients ≤100 ns. The AE2™ floating-gate technology enables stable threshold accuracy across temperature (30 ppm/°C tempco) and process variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±5% - precisely matches +5.0 V rail monitoring with guaranteed trip window of 4.50 V to 4.75 V over full temperature range |
| Reset Timeout | 140–400 ms - ensures reliable processor initialization timing across voltage ramp rates and temperature extremes |
| Supply Current | 6–20 µA - ultra-low quiescent draw supports battery-backed or energy-sensitive applications |
| VCC Operating Range | 1.2–5.5 V - enables supervision during brownout conditions and startup sequencing down to 1.2 V |
| MR Input Logic | Active LOW with 20 kΩ internal pull-up - simplifies external interface; open-circuit default is inactive state |
| Output Type | Push-pull active HIGH - eliminates need for external pull-up resistor and ensures defined logic level at all times |
| Temperature Range | -40°C to +85°C - fully specified for industrial-grade reliability without derating |
Pinout & Package
Package: SOT-143 (4-pin, JEDEC TO-253 compliant), 2.90 mm × 2.64 mm × 1.22 mm body, NiPdAu lead finish, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal voltage reference and comparator; must be low-impedance connection to system ground plane |
| 2 | RESET | Active HIGH push-pull output; asserts high when VCC < 4.63 V and holds for ≥140 ms after VCC recovery |
| 3 | MR | Manual reset input; logic LOW forces RESET high regardless of VCC; internal 20 kΩ pull-up ensures safe default |
| 4 | VCC | Monitored power supply input; also powers internal circuitry; valid operation requires ≥1.2 V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63 V threshold | ±5% tolerance over -40°C to +85°C ensures accurate +5.0 V rail monitoring without calibration |
| Active HIGH push-pull RESET | Eliminates external pull-up resistor, reduces BOM count, and guarantees known logic state at power-up and brownout |
| 140 ms minimum reset timeout | Meets Intel-compatible reset timing requirements for x86 and ARM-based microprocessors |
| 6 µA typical supply current | Enables use in always-on supervisory circuits without impacting system standby power budget |
| MR input with 20 kΩ pull-up | Reduces external component count and prevents floating input failure mode in unconnected configurations |
Applications
| Industrial Embedded Control | Network Infrastructure Equipment |
|---|---|
Use Scenario: Supervising +5.0 V power rails in programmable logic controllers (PLCs) and motor drive controllers where undervoltage can cause unsafe actuator states. IC Role / Device Role / Timing Role: Power-on reset generator and brownout detector ensuring deterministic firmware boot and safe I/O initialization. Use Value: Prevents erratic behavior during line sags by holding processor in reset until VCC stabilizes above 4.63 V for ≥140 ms. | Use Scenario: Monitoring primary +5.0 V supply in cable modems and DSL gateways subject to AC line fluctuations and thermal cycling. IC Role / Device Role / Timing Role: System-level power integrity monitor interfacing directly with SoC reset pin via push-pull active HIGH output. Use Value: Guarantees clean reset assertion during transient dips, eliminating spurious reboots caused by sub-100 ns noise on VCC. |
| White Goods Microcontroller Systems | Intelligent Meters |
Use Scenario: Reset management in refrigerator or washing machine main control boards powered from switched-mode +5.0 V supplies. IC Role / Device Role / Timing Role: Primary reset source coordinating MCU boot with power rail stabilization and enabling manual reset via front-panel button. Use Value: MR pin allows user-initiated reset without software intervention; internal pull-up avoids need for discrete resistor. | Use Scenario: Supervising auxiliary +5.0 V rail in electricity meters where long-term reliability and low power consumption are critical. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor maintaining reset integrity during battery backup operation and mains brownouts. Use Value: 6 µA typical ICC extends backup battery life while guaranteeing reset validity down to VCC = 1.2 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812LCSA+ | Same 4.63 V threshold, active HIGH reset, but uses SO-8 package (larger footprint) and higher 15 µA typical ICC | Preferred where board space permits larger package and legacy MAX design reuse is required | Select MAX812LCSA+ only if SO-8 layout exists and SOT-143 rework is not feasible |
| TPS3808G33DBVR | 3.3 V fixed threshold, not 4.63 V; adjustable version available but requires external resistor network | Suitable for +3.3 V systems only; not drop-in for +5.0 V monitoring without redesign | Choose TPS3808G33DBVR only when migrating to lower-voltage rails or requiring adjustable threshold flexibility |
Compared with MAX812LCSA+ and TPS3808G33DBVR, CAT812LTBI-T3 delivers identical 4.63 V supervision in a compact SOT-143 package with lowest ICC, making it optimal for space- and power-constrained +5.0 V industrial applications.
Availability
CAT812LTBI-T3 is available at Aetrix Electronics and suitable for industrial embedded control, network infrastructure equipment, and intelligent metering applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for CAT812LTBI-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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CAT812LTBI-T3 belongs to ON Semiconductor's microprocessor supervisory IC product line, designed specifically for reliable power-on reset and brownout protection in industrial-grade embedded systems operating from +5.0 V rails.
FAQ
What is the reset threshold voltage of CAT812LTBI-T3 and how is it specified?
The CAT812LTBI-T3 has a nominal reset threshold voltage of 4.63 V with ±5% tolerance over the full industrial temperature range (-40°C to +85°C). This means the actual trip point falls between 4.50 V and 4.75 V under worst-case conditions, ensuring precise +5.0 V rail supervision without external calibration. The threshold is factory-trimmed using AE2™ floating-gate technology for long-term stability.
Does CAT812LTBI-T3 support operation below 1.0 V on VCC?
No - CAT812LTBI-T3 is fully specified for operation from VCC = 1.2 V to 5.5 V. While the datasheet notes reset validity down to 1.0 V for functional assurance, the guaranteed operating range starts at 1.2 V. Below 1.2 V, the internal reference and comparator may not behave predictably, and the device does not guarantee correct RESET output state. For sub-1.2 V supervision, alternate solutions are recommended.
How does the manual reset (MR) input function on CAT812LTBI-T3?
The MR input on CAT812LTBI-T3 is an active LOW signal with an internal 20 kΩ pull-up resistor. When pulled LOW, it forces the RESET output HIGH immediately, independent of VCC level. RESET remains HIGH for at least 140 ms after MR returns HIGH. If left unconnected, the internal pull-up holds MR at logic HIGH, disabling manual reset. No external resistor is needed unless stronger pull-up is required.
What is the purpose of the push-pull active HIGH output in CAT812LTBI-T3?
The push-pull active HIGH output in CAT812LTBI-T3 eliminates the need for an external pull-up resistor, reducing BOM cost and PCB area. It actively drives RESET high during fault conditions and low during normal operation, ensuring a defined logic level at all times - unlike open-drain outputs that require external biasing. This simplifies interface with modern microcontrollers having dedicated reset inputs expecting active HIGH assertion.
Can CAT812LTBI-T3 replace MAX812 in existing designs?
Yes - CAT812LTBI-T3 is explicitly documented as a direct replacement for MAX812 in industrial-temperature applications. Both share identical 4.63 V threshold, active HIGH reset, SOT-143 package, pinout, and electrical specifications including 140 ms timeout and 6–20 µA supply current. No PCB changes are required, and the NiPdAu lead finish meets RoHS compliance requirements matching modern MAX812 variants.
CAT812LTBI-T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
CAT812LTBI-T3 FAQ
1.How can I place an order for CAT812LTBI-T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT812LTBI-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 CAT812LTBI-T3 reliable?
The price and inventory of CAT812LTBI-T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT812LTBI-T3 is usually 5 days.
3.What payment methods are accepted for CAT812LTBI-T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT812LTBI-T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT812LTBI-T3?
CAT812LTBI-T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT812LTBI-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 CAT812LTBI-T3?
For technical support, including CAT812LTBI-T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT812LTBI-T3 requirements.
6.How does Aetrix verify that CAT812LTBI-T3 is sourced from the original manufacturer or authorized distributors?
All CAT812LTBI-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 CAT812LTBI-T3 meets industry standards.
7.What is the process for return or replacement of CAT812LTBI-T3?
All CAT812LTBI-T3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT812LTBI-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 CAT812LTBI-T3 part is unused and in its original packaging.
Return procedure for CAT812LTBI-T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CAT812LTBI-T3 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…
