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HomeProductsIntegrated Circuits (ICs)PMIC - SupervisorsFT7521FHX
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FT7521FHX - Fairchild Semiconductor

Manufacturer Part Number
FT7521FHX
Manufacturer
Fairchild (onsemi)
Allelco Part Number
98D-FT7521FHX
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
246,708 pcs available, New & Original
Parts Description
IC SUPERVISOR PROG TIMER CMOS
Package
6-MicroPak2™
Data sheet
-
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 246708
  • Unit Price: $0.171
  • Subtotal: $0.00

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Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $0.171 $0.17
200+ $0.066 $13.20
500+ $0.064 $32.00
1000+ $0.063 $63.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

FT7521FHX Tech Specifications
Fairchild Semiconductor - FT7521FHX technical specifications, attributes, parameters and parts with similar specifications to Fairchild Semiconductor - FT7521FHX

Product Attribute Attribute Value
Manufacturer Fairchild (onsemi)
Voltage - Threshold -
Type Reset Timer
Supplier Device Package 6-MicroPak2™
Series -
Reset Timeout 320ms Minimum
Reset Active Low
Product Attribute Attribute Value
Package / Case 6-UFDFN
Package Bulk
Output Open Drain or Open Collector
Operating Temperature -40°C ~ 85°C (TA)
Mounting Type Surface Mount
Base Product Number FT7521

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What are the key electrical characteristics and timing parameters of the FT7521FHX supervisor timer IC that influence system-level reset behavior in embedded designs?
The FT7521FHX operates as a programmable voltage supervisor with a guaranteed minimum reset timeout of 320ms, ensuring sufficient delay for power-up stabilization or brownout recovery in microcontroller-based systems. Its open-drain or open-collector output configuration allows flexible interfacing with logic families, while active-low reset signaling aligns with common MCU reset pin conventions. The device’s CMOS implementation contributes to low quiescent current, which is critical for battery-powered applications where power efficiency directly impacts operational lifetime. Designers must ensure supply voltages remain above the undefined threshold range (not specified in public data) to maintain predictable reset assertion during undervoltage conditions. This combination of timing precision and output flexibility makes it suitable for space-constrained, cost-sensitive industrial controllers.
How does the thermal performance and package choice of the FT7521FHX affect its reliability in compact PCB layouts compared to alternative supervisory circuits?
The FT7521FHX utilizes the 6-MicroPak2™ package, offering minimal footprint (typically ~2mm x 2mm) ideal for high-density boards where component spacing is limited. With an MSL rating of 1, it supports unlimited floor life before reflow soldering, simplifying production handling. Operating across -40°C to 85°C ensures functionality in automotive edge cases and harsh environments without derating. However, due to the small exposed pad size, adequate copper pour and thermal vias under the package are recommended during layout to manage junction temperature rise during prolonged operation near 85°C ambient. In contrast to larger packages like SOIC-8, this micro-package reduces parasitic inductance but offers less thermal mass—designers must balance space savings against potential localized heating in continuous-duty applications.
Can the FT7521FHX be used interchangeably with other Fairchild Semiconductor supervisor timers such as the FT7520 or FT7522, and what design considerations apply when selecting between them?
While the FT7521FHX shares the same base product number (FT7521) and core architecture with devices like the FT7520 and FT7522, differences in reset timeout, threshold voltage, and output drive strength may preclude direct substitution without circuit verification. For instance, if a system requires exactly 320ms minimum reset pulse width, the FT7521FHX meets this specification, whereas another variant might have a different timeout profile. Additionally, packaging options differ—some siblings use standard DFN or SOT-23 forms instead of the MicroPak2™—impacting board real estate and manufacturing compatibility. Always validate timing margins and supply voltage monitoring accuracy under worst-case operating conditions before assuming interchangeability, especially in safety-critical systems.
What layout and decoupling strategies are recommended for the FT7521FHX to ensure stable operation and avoid false resets due to noise or transient events?
To minimize susceptibility to spurious resets, place the FT7521FHX close to the main power rail input, ideally within 10mm of the bulk decoupling capacitor network. Use a 0.1µF ceramic capacitor rated for the system’s maximum operating voltage, connected between VCC and GND with short, wide traces to reduce impedance. Avoid routing digital signal lines adjacent to the enable or reset output pins to prevent capacitive coupling. The open-drain output should include a pull-up resistor (e.g., 10kΩ typical) to the target logic rail; select resistor value based on bus capacitance and required rise time. Ground plane continuity beneath the device enhances noise immunity, particularly important given the absence of internal filtering in the feedback path.
Is the FT7521FHX suitable for automotive-grade applications requiring AEC-Q100 qualification, and what alternatives exist if certification is mandatory?
No, the FT7521FHX is not listed as AEC-Q100 qualified by Fairchild Semiconductor (now part of ON Semiconductor), limiting its use in production automotive systems where component reliability under thermal cycling and vibration is mandated. For such environments, consider automotive-qualified alternatives like the NCP3021 from ON Semiconductor or the MAX809T series from Maxim Integrated, which offer similar supervisory functions with certified performance over extended temperature ranges (-40°C to +125°C). These parts undergo rigorous testing beyond commercial grade and provide documented failure rates suitable for functional safety assessments. Migration to qualified components may increase BOM cost slightly but reduces long-term field failure risks in mission-critical vehicle electronics.
How does the RoHS compliance status and material composition of the FT7521FHX impact global regulatory adherence in international markets?
The FT7521FHX is fully compliant with RoHS3 directives, meaning it contains no restricted substances including lead, mercury, cadmium, hexavalent chromium, PBBs, or PBDEs at concentrations exceeding legal limits. This compliance facilitates market access in regions like the European Union, China, and California, where electronic waste regulations impose strict material constraints. REACH unaffected status further indicates that the device does not introduce SVHC (Substances of Very High Concern) above 0.1% weight thresholds, simplifying supplier declarations and reducing audit overhead. Manufacturers can confidently integrate this part into end products destined for consumer, industrial, or medical devices without additional halogen or phthalate testing burdens.
What are the implications of using bulk packaging versus tape-and-reel for the FT7521FHX in high-volume automated assembly processes?
Bulk packaging simplifies procurement for prototyping or low-quantity builds by eliminating minimum order quantities, but it complicates automated pick-and-place operations at scale. Tape-and-reel delivery enables higher-speed placement rates and reduces human handling errors, though it often requires higher MOQs from distributors. For high-volume production runs exceeding 10,000 units, requesting reel packaging improves factory throughput and lowers per-unit assembly costs. Conversely, bulk packaging may be preferable for R&D teams needing rapid iteration without committing to large inventories. Regardless of format, ensure proper ESD precautions during handling due to the sensitive CMOS input stages, particularly important in cleanroom or sensitive environment manufacturing.
What diagnostic features or test points should be included in a PCB design using the FT7521FHX to facilitate troubleshooting during integration or field maintenance?
Incorporate a test point directly after the open-drain output of the FT7521FHX to monitor reset signal integrity with an oscilloscope or logic probe. This allows verification of correct assertion timing during power-up sequences or fault conditions. Additionally, route the VCC net to a separate test pad to measure actual supply voltage at the IC input, confirming that undervoltage detection triggers as intended. Avoid probing during active reset events to prevent interference with normal operation. Label these test points clearly in the schematic to expedite debugging, especially when diagnosing intermittent resets caused by marginal power delivery or noisy regulators upstream.

Parts with Similar Specifications

The three parts on the right have similar specifications to Fairchild Semiconductor FT7521FHX

Product Attribute FT7521FHX FT7521L6X FT7521L6X FT7511L6X-FS
Part Number FT7521FHX FT7521L6X FT7521L6X FT7511L6X-FS
Manufacturer onsemi onsemi Fairchild Semiconductor Fairchild Semiconductor
Reset Timeout - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Base Product Number - DAC34H84 MAX500 ADS62P42
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Output - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Type - - - -
Reset - - - -
Series - - - -
Voltage - Threshold - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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FT7521FHX Image

FT7521FHX

Fairchild Semiconductor
98D-FT7521FHX

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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