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onsemi KA75270ZTA
- Part No.:
- KA75270ZTA
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KA75270ZTA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,598
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Product details
Overview
KA75270ZTA from Fairchild Semiconductor is a fixed-threshold voltage detector IC designed for microprocessor reset supervision, with 2.7 V detection threshold, ±0.01 %/°C temperature coefficient, 50 mV hysteresis, and TO-92-3 package; used in embedded power-on reset circuits for industrial controllers and battery-powered instrumentation.
For engineers reviewing the KA75270ZTA datasheet, pinout, applications, or equivalent options, key selection criteria include detection accuracy over temperature, low quiescent current in off-state (30–50 µA), output sink capability (≥10 mA), and compatibility with 3.3 V or 5 V logic-level reset inputs.
Technical Context
The KA75270ZTA integrates a precision bandgap reference, comparator, and open-drain NMOS output stage. It operates without external components and asserts a low-active reset signal when supply voltage falls below 2.7 V, releasing reset after hysteresis recovery to ≥2.75 V.
Its internal architecture supports direct connection to microcontroller RESET pins with no pull-up required beyond system-level logic interface. The device draws only 30–50 µA during normal operation and less than 0.1 µA leakage at VCC = 15 V, enabling long-battery-life applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 2.7 V ±2.5% - sets precise reset assertion point for 3.3 V systems |
| Hysteresis | 50 mV - prevents chatter near threshold during slow-rising/falling VCC |
| Output Type | Open-drain NMOS - allows wired-OR reset bus and flexible pull-up voltage selection |
| Off-State Current | 30–50 µA at 5.25 V - minimizes standby power in always-on monitoring |
| On-State Sink Current | 10–30 mA at VDET(MIN) −0.05 V - ensures reliable drive into MCU reset pin capacitance |
| Temp Coefficient | ±0.01 %/°C - maintains <±0.3% detection drift across −25°C to +85°C |
| Propagation Delay | 0.6–10 µs (low-to-high), ≤20 µs (high-to-low) - enables fast response to brownout events |
Pinout & Package
KA75270ZTA is supplied in TO-92-3 plastic package (JEDEC TO-92 variant), with 3.60 mm body width, 4.58 mm height, and 14.47 mm overall length. Pin 1 is INPUT, Pin 2 is GND, Pin 3 is OUTPUT (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Monitors VCC rail directly; no external resistor divider needed |
| 2 | GND | System ground reference for internal comparator and output stage |
| 3 | Output | Open-drain NMOS - requires external pull-up to logic supply (e.g., 3.3 V or 5 V) |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.7 V detection threshold | Eliminates need for external resistive divider and associated tolerance stack-up |
| 50 mV built-in hysteresis | Guarantees clean, chatter-free reset release without external RC network |
| Low 30–50 µA operating current | Extends battery life in portable equipment where continuous monitoring is required |
| −25°C to +85°C operating range | Validated for use in industrial control cabinets and unregulated ambient environments |
| Open-drain output with 10–30 mA sink | Directly interfaces to standard CMOS/TTL reset inputs without level-shifting |
Applications
| Industrial PLC Power Monitoring | Smart Meter Brownout Detection |
|---|---|
Use Scenario: Monitors 5 V DC supply in programmable logic controller backplane during AC line sags or capacitor discharge. IC Role / Device Role / Timing Role: Voltage detector providing active-low reset pulse to ARM Cortex-M4 MCU upon VCC drop below 2.7 V. Use Value: Prevents corrupted firmware execution by ensuring CPU remains held in reset until stable 5 V is restored. | Use Scenario: Embedded in utility smart meters to detect battery-backed supply degradation during mains outage. IC Role / Device Role / Timing Role: Supervisory IC asserting reset to metering SoC when backup Li-ion voltage falls below 2.7 V threshold. Use Value: Preserves EEPROM integrity and prevents invalid kWh accumulation during low-voltage conditions. |
| POS Terminal Boot Integrity | IoT Sensor Node Wake-Up Control |
Use Scenario: Ensures reliable boot sequence in retail point-of-sale terminals powered from switching adapters with variable load transients. IC Role / Device Role / Timing Role: Reset supervisor triggering hardware reset of i.MX6UL processor if 3.3 V rail dips below 2.7 V during peripheral hot-plug. Use Value: Avoids kernel panic or filesystem corruption caused by undervoltage during USB peripheral enumeration. | Use Scenario: Used in battery-operated environmental sensors to gate wake-up of ultra-low-power MCU only when supply exceeds 2.7 V. IC Role / Device Role / Timing Role: Voltage enable switch controlling power to RF transceiver and ADC subsystem via external MOSFET gate. Use Value: Reduces average system current by >90% during sleep by disabling non-essential circuitry below valid operating voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB27DPWR | 2.7 V threshold, SOT-23-3, 350 nA max IQ, −40°C to +125°C | Lower power, wider temp range, but lower sink current (4 mA) | Preferred for extended-temp or ultra-low-power designs where 4 mA sink suffices |
| APX803S-27SA-7 | 2.7 V threshold, SOT-23-3, 1.6 µA IQ, 12 mA sink, −40°C to +125°C | Higher accuracy (±0.5%), tighter hysteresis (typ. 100 mV), smaller footprint | Best for space-constrained designs needing improved thermal stability and noise immunity |
Compared with KA75270ZTA, TLV803EB27DPWR offers dramatically lower quiescent current but reduced drive strength, while APX803S-27SA-7 delivers superior accuracy and hysteresis at the cost of higher unit price and different package-both require PCB redesign due to SOT-23-3 footprint mismatch with TO-92.
Availability
KA75270ZTA is available at Aetrix Electronics and suitable for industrial automation, smart metering, and point-of-sale terminal designs requiring stable component supply, long-lifecycle availability, and legacy through-hole compatibility.
Supply support for KA75270ZTA 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; known for high-reliability discrete and supervisory products.
The KA75XXX series was developed specifically for cost-sensitive, high-volume microprocessor reset supervision in consumer and industrial electronics where fixed-threshold simplicity and TO-92 manufacturability were critical.
FAQ
What is the detection voltage tolerance of KA75270ZTA?
The KA75270ZTA has a detection voltage of 2.7 V with a tolerance of ±2.5%, meaning it asserts reset between 2.63 V and 2.77 V at 25°C. This specification is guaranteed across the full operating temperature range (−25°C to +85°C) with additional drift limited by ±0.01 %/°C temperature coefficient. The KA75270ZTA datasheet confirms this in the Electrical Characteristics table under VDET for KA75270.
Does KA75270ZTA require external components to operate?
No, KA75270ZTA operates autonomously with no external components required. Its fixed 2.7 V threshold, internal hysteresis, and open-drain output eliminate the need for resistor dividers, capacitors, or pull-up resistors beyond the system-level logic pull-up on the output pin. This simplifies layout and improves reliability compared to adjustable supervisors. The KA75270ZTA Application Circuit diagram shows direct VCC-to-INPUT and OUTPUT-to-MCU-RESET connection.
What is the maximum supply voltage rating for KA75270ZTA?
The absolute maximum supply voltage for KA75270ZTA is +15.0 V, with a minimum of −0.3 V. However, its functional detection range is optimized for 2.7 V to 5.5 V systems. Operation above 5.5 V increases off-state current and may reduce long-term reliability; the KA75270ZTA Absolute Maximum Ratings table specifies 0.3 V to +15.0 V, but recommended operating VCC is ≤5.5 V per application guidance.
Can KA75270ZTA be used with a 3.3 V microcontroller reset input?
Yes, KA75270ZTA is fully compatible with 3.3 V microcontrollers. Its open-drain output can be pulled up to 3.3 V, and its low output voltage (≤0.4 V at 200 Ω load) ensures solid logic-low assertion. The KA75270ZTA output sink current (10–30 mA) exceeds typical MCU reset pin input current requirements (<100 µA), guaranteeing robust interface without buffering. This is confirmed in the Electrical Characteristics table under VOL and IOLI.
Is KA75270ZTA pin-compatible with other KA75XXX variants?
Yes, all KA75XXX devices-including KA75270ZTA-share identical TO-92-3 pinout (Pin 1: INPUT, Pin 2: GND, Pin 3: OUTPUT) and SOT-89-3 pinout. Threshold voltage differs across variants (e.g., KA75250ZTA = 2.5 V, KA75290ZTA = 2.9 V), but electrical behavior, timing, and packaging are otherwise consistent. This allows design reuse across voltage grades without layout changes, as documented in the Ordering Information and Mechanical Dimensions sections of the KA75270ZTA datasheet.
KA75270ZTA 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:
- 2.7V
- 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
KA75270ZTA FAQ
1.How can I place an order for KA75270ZTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KA75270ZTA 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 KA75270ZTA reliable?
The price and inventory of KA75270ZTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA75270ZTA is usually 5 days.
3.What payment methods are accepted for KA75270ZTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA75270ZTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA75270ZTA?
KA75270ZTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA75270ZTA 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 KA75270ZTA?
For technical support, including KA75270ZTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA75270ZTA requirements.
6.How does Aetrix verify that KA75270ZTA is sourced from the original manufacturer or authorized distributors?
All KA75270ZTA 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 KA75270ZTA meets industry standards.
7.What is the process for return or replacement of KA75270ZTA?
All KA75270ZTA units undergo pre-shipment inspection (PSI). If there is an issue with KA75270ZTA, 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 KA75270ZTA part is unused and in its original packaging.
Return procedure for KA75270ZTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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