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onsemi KA75250ZTA
- Part No.:
- KA75250ZTA
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KA75250ZTA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
KA75250ZTA from Fairchild Semiconductor is a fixed-threshold voltage detector IC designed for microprocessor reset supervision, with 2.5 V detection threshold, ±0.01 %/°C temperature coefficient, 50 mV hysteresis, and operation from −25 °C to +85 °C. It delivers 20 mA output sink current at on-state and supports TO-92 package for embedded power-on/off error prevention in battery-powered systems.
For engineers reviewing the KA75250ZTA datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, TO-92 terminal mapping, real-world use cases in microcontroller reset circuits, and two validated alternative detectors with documented voltage and package differences.
Technical Context
The KA75250ZTA implements a precision bandgap-based voltage reference with internal comparator and open-drain NMOS output stage. Its detection threshold is factory-trimmed to 2.5 V (±0.15 V), and hysteresis is fixed at 50 mV to prevent oscillation during slow-rising supply transitions.
It operates with ultra-low quiescent current-30–50 µA in off-state and ≤500 µA during active detection-and features guaranteed low output voltage (≤0.4 V at 200 Ω load) to ensure reliable reset assertion for TTL/CMOS logic inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detecting Voltage | 2.5 V ±0.15 V - precise reset trigger point for 3.3 V or 5 V microcontrollers |
| Hysteresis Voltage | 50 mV - prevents chatter during brown-out recovery without external components |
| Output Type | Open-drain NMOS - enables wired-OR reset bus and flexible pull-up selection |
| Supply Range | 0.3 V to 15 V - supports wide input rails including single-cell Li-ion and multi-rail systems |
| Operating Temp | −25 °C to +85 °C - qualified for industrial ambient environments |
| Quiescent Current | 30–50 µA (off-state) - minimizes standby power in battery-backed applications |
| Output Sink Current | 20 mA (typ.) - drives standard reset inputs without external buffer |
Pinout & Package
KA75250ZTA is supplied in TO-92 package (3-pin, through-hole), with standardized pin assignment per Fairchild mechanical drawing: Pin 1 = INPUT (VCC), Pin 2 = GND, Pin 3 = OUTPUT (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Power Input | Supplies operating voltage; internally connected to voltage reference and comparator |
| Pin 2 | Ground Reference | Common return path for internal circuitry and output stage |
| Pin 3 | Open-Drain Output | Sinks current when VIN < VDET; requires external pull-up for active-high reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed detection threshold | 2.5 V with ±0.15 V tolerance - eliminates need for external resistor divider calibration |
| Integrated hysteresis | 50 mV fixed - ensures clean, bounce-free reset release without external RC network |
| Low-temperature drift | ±0.01 %/°C - maintains detection accuracy across industrial temperature range |
| Guaranteed low VOL | ≤0.4 V at 200 Ω load - ensures compatible logic-level reset assertion for 3.3 V and 5 V MCUs |
| Wide supply range support | 0.3 V to 15 V operation - enables direct connection to unregulated battery or rail inputs |
Applications
| Microcontroller Power-On Reset | Battery Voltage Monitoring |
|---|---|
Use Scenario: Ensuring safe initialization of an ARM Cortex-M0 MCU after cold start or power interruption. IC Role / Device Role / Timing Role: Voltage detector asserting active-low reset until VCC exceeds 2.5 V and stabilizes. Use Value: Prevents code execution at insufficient supply, eliminating undefined register states and flash corruption risk. | Use Scenario: Detecting end-of-life voltage in a 3.7 V Li-ion cell powering a portable sensor node. IC Role / Device Role / Timing Role: Threshold comparator triggering low-battery warning before cell drops below 2.5 V cutoff. Use Value: Enables graceful shutdown and data preservation using only 30 µA quiescent current. |
| Industrial PLC I/O Module Supervision | Legacy 5 V Digital Logic Reset |
Use Scenario: Securing reliable boot sequence in a DIN-rail mounted programmable logic controller with multiple 5 V rails. IC Role / Device Role / Timing Role: Independent reset supervisor for FPGA configuration logic and communication interface ASICs. Use Value: Guarantees synchronized reset release across subsystems despite rail sequencing variations. | Use Scenario: Replacing obsolete 74HC123-based reset timing in legacy instrumentation with discrete TTL logic. IC Role / Device Role / Timing Role: Precision voltage-triggered reset generator replacing RC-timed solutions. Use Value: Eliminates timing drift due to capacitor aging and temperature, improving long-term system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV7031DBVR | 2.5 V threshold, SOT-23-5, push-pull output, 1.8–5.5 V supply | Requires external pull-up for open-drain emulation; higher supply sensitivity limits use above 5.5 V | Preferred where board space is constrained and 5 V operation is not required |
| MAX809TRD3+T | 2.5 V threshold, SOT-23-3, open-drain, −40 °C to +85 °C, 1.2–6.0 V supply | Wider temp range and lower max supply voltage; identical TO-92 pinout unavailable | Best for extended temperature designs needing drop-in replacement in SOT-23 footprint |
Compared with KA75250ZTA, TLV7031DBVR offers smaller footprint but lacks 15 V tolerance and TO-92 compatibility, while MAX809TRD3+T extends temperature range but requires PCB redesign due to SOT-23 packaging and different pinout.
Availability
KA75250ZTA is available at Aetrix Electronics and suitable for microcontroller reset supervision, battery voltage monitoring, industrial PLC module startup control, and legacy 5 V digital logic reset applications requiring stable component supply and long-lifecycle sourcing.
Supply support for KA75250ZTA 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
Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy products remain widely deployed in industrial and automotive systems.
The KA75XXX series was designed specifically for cost-sensitive, high-volume voltage monitoring and reset generation in consumer, industrial, and computing equipment where precision, low power, and TO-92/SOT-89 compatibility were critical.
FAQ
What is the exact detection threshold voltage of KA75250ZTA?
The KA75250ZTA has a nominal detection threshold of 2.5 V, with a guaranteed range of 2.35 V to 2.65 V at 25 °C. This value is factory-trimmed and specified in the Electrical Characteristics table under VDET for KA75250. The device maintains this accuracy across temperature with a drift of ±0.01 %/°C.
Does KA75250ZTA require external components to function as a reset supervisor?
No, KA75250ZTA operates autonomously with no external resistors or capacitors required. Its 2.5 V threshold, 50 mV hysteresis, and open-drain output are fully integrated. Only an external pull-up resistor on Pin 3 is needed to generate an active-high reset signal, which is standard practice for most microcontroller reset inputs.
What package type is used for KA75250ZTA, and how are its pins arranged?
KA75250ZTA uses the TO-92 package. Pin 1 is INPUT (VCC), Pin 2 is GND, and Pin 3 is OUTPUT (open-drain). This pinout is confirmed in the "Mechanical Dimensions" section and internal block diagram of the Fairchild datasheet Rev. 1.0.3.
Can KA75250ZTA be used with a 12 V supply rail?
Yes, KA75250ZTA supports supply voltages up to +15.0 V, making it fully compatible with 12 V systems. Its absolute maximum rating specifies VCC = 0.3 V to +15.0 V, and all electrical characteristics-including detection accuracy and output performance-are validated across this full range.
Is KA75250ZTA suitable for automotive applications?
KA75250ZTA is rated for −25 °C to +85 °C operation and was not qualified to AEC-Q100 standards. While it may function in some under-hood or cabin environments, Fairchild's Life Support Policy and lack of automotive qualification mean KA75250ZTA is intended for industrial, computing, and consumer applications-not safety-critical automotive systems.
KA75250ZTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.5V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KA75250ZTA FAQ
1.How can I place an order for KA75250ZTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KA75250ZTA 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 KA75250ZTA reliable?
The price and inventory of KA75250ZTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA75250ZTA is usually 5 days.
3.What payment methods are accepted for KA75250ZTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA75250ZTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA75250ZTA?
KA75250ZTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA75250ZTA 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 KA75250ZTA?
For technical support, including KA75250ZTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA75250ZTA requirements.
6.How does Aetrix verify that KA75250ZTA is sourced from the original manufacturer or authorized distributors?
All KA75250ZTA 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 KA75250ZTA meets industry standards.
7.What is the process for return or replacement of KA75250ZTA?
All KA75250ZTA units undergo pre-shipment inspection (PSI). If there is an issue with KA75250ZTA, 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 KA75250ZTA part is unused and in its original packaging.
Return procedure for KA75250ZTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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