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NXP Semiconductors PCF1252-0T/F4,118
- Part No.:
- PCF1252-0T/F4,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCF1252-0T/F4,118.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,581
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Product details
Overview
PCF1252-0T/F4,118 from NXP Semiconductors (formerly Philips) is a low-power CMOS voltage threshold detector and reset generator designed for microcontroller/microprocessor power supervision. It features a factory-programmed 4.75 V trip point (±50 mV accuracy), 10 µA typical supply current, and dual comparator architecture with POWF output for power-fail detection in embedded control systems.
For engineers reviewing the PCF1252-0T/F4,118 datasheet, PCF1252-0T/F4,118 pinout, PCF1252-0T/F4,118 application, or PCF1252-0T/F4,118 equivalent, key selection criteria include precise reset timing via external capacitor (CCT), selectable RESET polarity, advance warning of power failure, and second-level monitoring capability via COMIN/COMOUT.
Technical Context
The PCF1252-0T/F4,118 integrates two independent comparators: Comparator 1 monitors VDD against a precision internal reference to generate RESET and POWF signals, while Comparator 2 accepts an external input at COMIN (switch point 1.30 V) for secondary voltage monitoring. Its delay circuit uses an external capacitor on CT to set both reset pulse duration (tR) and save time (tS).
It operates across −40 to +85 °C with 2.4–6.0 V supply range, includes 15–50 mV hysteresis to prevent oscillation near VTRIP, and delivers defined outputs at 0.6 V (typ.) with ±50 mV trip accuracy over temperature - enabling reliable brown-out detection and orderly shutdown in resource-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Trip Point | 4.75 V (factory-programmed; ±50 mV accuracy over −40 to +85 °C) |
| Supply Current | 10 µA typical (enables battery-backed or ultra-low-power system supervision) |
| Reset Pulse Duration | 400–2000 µs (set by external CT capacitor; tR ≈ 0.1 + CCT ms) |
| Power-Fail Save Time | 40–200 µs (tS ≈ 0.01 + 0.1×CCT ms; provides critical data storage window) |
| COMIN Switch Point | 1.30 V (typ.; enables second-level monitoring without external reference) |
| Hysteresis | 15–50 mV (prevents chatter during slow VDD transitions near trip point) |
| Operating Temperature | −40 to +85 °C (supports industrial-grade embedded deployment) |
Pinout & Package
PCF1252-0T/F4,118 is housed in an SO8 plastic small outline package (SOT96-1), 8-lead, 3.9 mm body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CT (Pin 1) | External timing capacitor connection | Sets RESET pulse width (tR) and POWF-to-RESET delay (tS); supports 100 pF–1 µF range |
| SELECT (Pin 2) | Polarity control / external reset input | LOW = active-high RESET; HIGH = active-low RESET; also accepts debounced external reset signal |
| COMIN (Pin 3) | Second comparator input | Monitors auxiliary voltage (e.g., backup rail); no built-in hysteresis; connect to VDD if unused |
| VSS (Pin 4) | Ground reference | 0 V return path for all internal circuits and outputs |
| COMOUT (Pin 5) | Second comparator output | HIGH when COMIN > 1.30 V; LOW when COMIN < 1.30 V; open-drain compatible |
| RESET (Pin 6) | System reset output | Active-low or active-high (selectable); defined logic level at 0.6 V (typ.) under load |
| POWF (Pin 7) | Power-fail warning output | Asserts LOW when VDD falls below VTRIP; triggers tS delay before RESET activation |
| VDD (Pin 8) | Positive supply input | 2.4–6.0 V operation; internally divided for comparator reference generation |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator architecture | Enables primary VDD supervision + independent secondary voltage monitoring (e.g., battery or auxiliary rail) |
| Factory-programmed trip point | 4.75 V (PCF1252-0 variant) ensures consistent brown-out detection without external resistor networks |
| Adjustable reset timing | External CT capacitor allows precise tuning of reset pulse width (tR) and save time (tS) per system requirements |
| Power-fail advance warning | POWF output asserts before RESET, providing deterministic window for data retention or graceful shutdown |
| Low quiescent current | 10 µA typical supply current minimizes impact on standby power budget in always-on systems |
Applications
| Microcontroller Power-On Reset | Data Retention in Memory Backup |
|---|---|
Use Scenario: Ensuring reliable boot sequence after power-up in 5 V microcontroller systems. IC Role / Device Role / Timing Role: Generates a clean, capacitor-timed reset pulse synchronized to VDD crossing 4.75 V threshold. Use Value: Prevents erratic MCU startup by guaranteeing minimum reset assertion time (400–2000 µs) before release. | Use Scenario: Preserving RAM contents during main supply collapse using backup battery. IC Role / Device Role / Timing Role: POWF output signals imminent power loss; tS delay allows microcontroller to store critical data before RESET. Use Value: Provides 40–200 µs deterministic save window (scalable with CT) for nonvolatile write operations. |
| Overvoltage Monitoring | Multi-Rail System Supervision |
Use Scenario: Detecting overvoltage on a 3.3 V I/O rail using external divider referenced to VDD. IC Role / Device Role / Timing Role: COMIN input monitors scaled voltage; COMOUT flags excursion above 1.30 V switch point. Use Value: Enables secondary protection without adding discrete comparator or reference IC. | Use Scenario: Simultaneous monitoring of 5 V main supply and 3.3 V logic rail in industrial controller. IC Role / Device Role / Timing Role: Comparator 1 supervises VDD (4.75 V trip); Comparator 2 monitors 3.3 V rail via resistive divider at COMIN. Use Value: Single IC replaces two discrete supervisors, reducing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor and reset generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Fixed 3.08 V reset threshold; no second comparator; no POWF output; SOT-23-3 package | Single-rail supervision only; no advance power-fail warning or auxiliary monitoring | Choose for space-constrained, single-threshold applications where dual monitoring is unnecessary |
| TPS3823-33DBVR | 3.3 V fixed threshold; push-pull RESET; no COMIN/COMOUT; 200 ms fixed reset timeout | Lacks adjustable timing, secondary comparator, and POWF functionality; optimized for simpler reset-only use cases | Prefer when deterministic long-duration reset (200 ms) suffices and auxiliary monitoring is not required |
Compared with MAX809SEUR+T and TPS3823-33DBVR, the PCF1252-0T/F4,118 uniquely supports dual-voltage monitoring, programmable reset timing, and power-fail advance warning - making it suitable for complex embedded systems requiring coordinated shutdown and data integrity.
Availability
PCF1252-0T/F4,118 is available at Aetrix Electronics and suitable for microcontroller power-on reset, memory backup data retention, overvoltage detection, and multi-rail system supervision requiring stable component supply and long-term industrial availability.
Supply support for PCF1252-0T/F4,118 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
NXP Semiconductors is a global semiconductor leader delivering high-performance analog, logic, interface, and power management solutions for automotive, industrial, and consumer applications.
The PCF1252-X family was developed by Philips (now NXP) specifically for low-power, precision voltage supervision in microcontroller-based systems - emphasizing reliability, minimal external components, and flexible reset timing.
FAQ
What is the factory-programmed voltage trip point for PCF1252-0T/F4,118?
The PCF1252-0T/F4,118 has a factory-programmed voltage trip point of 4.75 V (with ±50 mV accuracy over −40 to +85 °C). This value is fixed per the "-0" suffix in the part number and corresponds to the lowest threshold in the PCF1252-X family, optimized for 5 V microcontroller systems requiring robust brown-out detection before reset release.
How does the CT pin on PCF1252-0T/F4,118 affect reset timing?
The CT pin on PCF1252-0T/F4,118 connects to an external capacitor that sets both the reset pulse duration (tR) and the power-fail save time (tS). With CCT = 1 nF, tR ranges from 400–2000 µs and tS from 40–200 µs. The relationship is approximately tR = (0.1 + CCT) ms and tS = (0.01 + 0.1×CCT) ms, allowing precise tailoring of timing behavior to system requirements.
Can PCF1252-0T/F4,118 monitor a second voltage rail?
Yes, PCF1252-0T/F4,118 can monitor a second voltage rail using its COMIN pin (Pin 3) and COMOUT pin (Pin 5). When an external voltage divider applies a scaled version of the auxiliary rail to COMIN, the internal comparator triggers COMOUT HIGH if the input exceeds 1.30 V (typ.). This enables overvoltage or undervoltage detection on a secondary supply without additional ICs.
What is the function of the POWF output on PCF1252-0T/F4,118?
The POWF (Power Fail) output on PCF1252-0T/F4,118 goes LOW when VDD drops below the 4.75 V trip point, signaling imminent power loss. It initiates the tS save-time delay before RESET activates, giving the system a deterministic window (e.g., 40–200 µs) to execute critical tasks like saving configuration data or disabling peripherals before full reset.
Is PCF1252-0T/F4,118 compatible with modern reflow soldering processes?
Yes, PCF1252-0T/F4,118 uses an SO8 package (SOT96-1) qualified for reflow soldering. Recommended peak reflow temperature is 215–250 °C, with preheating at 45 °C for 45 minutes. The device supports standard Pb-free reflow profiles and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount assembly.
PCF1252-0T/F4,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.75V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 400µs Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
PCF1252-0T/F4,118 FAQ
1.How can I place an order for PCF1252-0T/F4,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF1252-0T/F4,118 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 PCF1252-0T/F4,118 reliable?
The price and inventory of PCF1252-0T/F4,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF1252-0T/F4,118 is usually 5 days.
3.What payment methods are accepted for PCF1252-0T/F4,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF1252-0T/F4,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF1252-0T/F4,118?
PCF1252-0T/F4,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF1252-0T/F4,118 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 PCF1252-0T/F4,118?
For technical support, including PCF1252-0T/F4,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF1252-0T/F4,118 requirements.
6.How does Aetrix verify that PCF1252-0T/F4,118 is sourced from the original manufacturer or authorized distributors?
All PCF1252-0T/F4,118 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 PCF1252-0T/F4,118 meets industry standards.
7.What is the process for return or replacement of PCF1252-0T/F4,118?
All PCF1252-0T/F4,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCF1252-0T/F4,118, 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 PCF1252-0T/F4,118 part is unused and in its original packaging.
Return procedure for PCF1252-0T/F4,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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