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onsemi KA75330ZBU
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- Part No.:
- KA75330ZBU
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
KA75330ZBU.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
KA75330ZBU from Fairchild Semiconductor is a fixed-threshold voltage detector IC designed for microprocessor reset supervision, with 3.3 V detection threshold, 50 mV hysteresis, and operation over −25 °C to +85 °C. It delivers low output voltage (≤0.4 V at 200 Ω load) and supports battery monitoring in embedded power management systems.
For engineers reviewing the KA75330ZBU datasheet, pinout, applications, or equivalent options, key selection criteria include detection accuracy (±0.15 V), ultra-low quiescent current (30–50 µA off-state), output drive capability (≥10 mA sink), and TO-92/SOT-89 package compatibility for space-constrained PCB layouts.
Technical Context
The KA75330ZBU implements a precision bandgap-based voltage reference and comparator with built-in hysteresis to prevent oscillation during supply ramp-up or brownout conditions. Its internal circuitry ensures reliable reset assertion when VCC falls below 3.15 V and release above 3.45 V.
It operates without external components, draws ≤500 µA during detection, and maintains stable performance across temperature via ±0.01 %/°C detection voltage drift - enabling robust reset timing in industrial control and automotive body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detecting Voltage | 3.3 V nominal (3.15–3.45 V range); sets precise MCU reset activation threshold |
| Hysteresis Voltage | 50 mV typical; prevents chatter during supply recovery near threshold |
| Low Output Voltage | ≤0.4 V at 200 Ω load; ensures clean logic-low reset signal to CPU |
| Supply Voltage Range | 0.3 V to 15.0 V; supports wide-input rail monitoring including 3.3 V, 5 V, and 12 V systems |
| Quiescent Current | 30–50 µA at VCC = 5.25 V; enables long-battery-life applications |
| Operating Temperature | −25 °C to +85 °C; qualified for industrial ambient environments |
| Output Sink Current | 10–30 mA; drives standard TTL/CMOS reset inputs without external buffer |
Pinout & Package
KA75330ZBU is available in TO-92 package (3-pin, through-hole) with standardized pin assignment: Pin 1 = INPUT (VCC sense), Pin 2 = GND, Pin 3 = OUTPUT (open-drain active-low reset).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Voltage sensing node; monitors system supply rail for undervoltage condition |
| 2 | GND | Analog and power ground reference for internal comparator and reference |
| 3 | Output | Open-drain N-channel MOSFET output; pulls reset line low during fault |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V detection threshold | Eliminates need for external resistor divider in 3.3 V logic systems |
| 50 mV hysteresis | Guarantees monotonic reset deassertion after supply recovery |
| Active-low open-drain output | Enables wired-OR reset bus configuration with multiple supervisors |
| −25 °C to +85 °C operating range | Suitable for non-automotive industrial control and consumer power supplies |
| TO-92 package | Compatible with legacy through-hole assembly and manual prototyping |
Applications
| Microcontroller Reset Supervision | Battery Voltage Monitoring |
|---|---|
Use Scenario: Power-on and brownout protection for 3.3 V ARM Cortex-M0/M3 microcontrollers in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage detector asserting active-low reset until VCC stabilizes ≥3.45 V and remains above 3.15 V. Use Value: Prevents code execution from corrupted memory or unstable clock domains during supply transients. | Use Scenario: Low-battery warning in portable medical devices powered by single-cell Li-ion (3.0–4.2 V range). IC Role / Device Role / Timing Role: Threshold comparator triggering LED or MCU interrupt when cell voltage drops below 3.3 V. Use Value: Enables graceful shutdown before deep discharge, preserving battery cycle life and data integrity. |
| Power Supply Sequencing | Industrial Sensor Node Power Management |
Use Scenario: Ensuring proper startup order between 5 V analog front-end and 3.3 V digital core in modular instrumentation. IC Role / Device Role / Timing Role: Delayed reset release controlled by VDET hysteresis and propagation delay (0.6–10 µs). Use Value: Avoids race conditions where digital logic powers up before analog references settle. | Use Scenario: Wake-up supervision for LoRaWAN sensor nodes using intermittent sleep cycles. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current detector enabling <50 µA standby current while monitoring 3.3 V LDO output. Use Value: Extends battery life beyond 5 years in field-deployed environmental monitoring units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803DBZT | 3.3 V threshold, SOT-23-3, 3 µA max IQ, but only −40 °C to +125 °C rating | Higher temp range suits automotive under-hood use; lower IQ benefits battery-critical designs | Prefer TLV803DBZT for extended temperature or ultra-low-power requirements; KA75330ZBU remains optimal for cost-sensitive industrial TO-92 layouts |
| APX803S-33SA-7 | 3.3 V threshold, SOT-23-3, 1.6 µA IQ, push-pull output (not open-drain) | Push-pull eliminates pull-up resistor but prevents wired-OR reset busing | Select APX803S-33SA-7 when board space is constrained and reset bus sharing is unnecessary |
Compared with TLV803DBZT and APX803S-33SA-7, the KA75330ZBU offers proven TO-92 manufacturability, higher output drive (10–30 mA vs. ~5 mA), and open-drain flexibility - making it preferred for legacy industrial designs requiring mechanical robustness and bus-compatible reset signaling.
Availability
KA75330ZBU is available at Aetrix Electronics and suitable for microcontroller reset supervision, battery voltage monitoring, power supply sequencing, and industrial sensor node power management requiring stable component supply and long-term obsolescence support.
Supply support for KA75330ZBU 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 semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy products remain widely deployed in industrial and consumer systems.
The KA75XXX series was developed specifically for cost-effective, single-threshold voltage monitoring in microprocessor-based equipment - emphasizing simplicity, reliability, and ease of integration without external components.
FAQ
What is the exact detection voltage tolerance for KA75330ZBU?
The KA75330ZBU has a guaranteed detection voltage range of 3.15 V to 3.45 V at 25 °C, corresponding to ±0.15 V absolute tolerance around the nominal 3.3 V threshold. This specification is validated per the Electrical Characteristics table in the original Fairchild datasheet Rev. 1.0.3, with no derating required across the full −25 °C to +85 °C operating range.
Does KA75330ZBU require external components to function?
No, the KA75330ZBU operates autonomously with no external components required. Its internal bandgap reference, comparator, and hysteresis circuitry are fully integrated. Only a decoupling capacitor (recommended 0.1 µF) near the input pin improves noise immunity - but this is optional, not mandatory, for basic reset functionality in KA75330ZBU applications.
What is the output configuration of KA75330ZBU and how should it be interfaced?
The KA75330ZBU features an open-drain N-channel MOSFET output (Pin 3). It must be used with an external pull-up resistor to the target logic rail (e.g., 3.3 V or 5 V). This allows wired-OR connection with other reset sources and ensures compatibility with TTL/CMOS input thresholds. The KA75330ZBU sinks up to 30 mA when asserted, supporting direct interface to most microcontroller reset pins.
Is KA75330ZBU pin-compatible with other parts in the KA75XXX family?
Yes, all KA75XXX variants - including KA75250ZBU through KA75450ZBU - share identical TO-92 and SOT-89 pinouts (Pin 1: INPUT, Pin 2: GND, Pin 3: OUTPUT). This allows direct substitution within the same package footprint when only the detection threshold differs, simplifying design reuse and inventory consolidation for KA75330ZBU and related parts.
What is the maximum supply voltage the KA75330ZBU can monitor?
The KA75330ZBU supports supply voltage monitoring from 0.3 V up to 15.0 V, as specified in its Absolute Maximum Ratings. This wide range permits use with 3.3 V, 5 V, and 12 V rails without level-shifting. However, detection accuracy and hysteresis remain guaranteed only within the recommended operating conditions - specifically for VCC ≥ VDET + 0.1 V - ensuring reliable KA75330ZBU performance across common system voltages.
KA75330ZBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- 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
KA75330ZBU FAQ
1.How can I place an order for KA75330ZBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KA75330ZBU 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 KA75330ZBU reliable?
The price and inventory of KA75330ZBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA75330ZBU is usually 5 days.
3.What payment methods are accepted for KA75330ZBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA75330ZBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA75330ZBU?
KA75330ZBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA75330ZBU 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 KA75330ZBU?
For technical support, including KA75330ZBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA75330ZBU requirements.
6.How does Aetrix verify that KA75330ZBU is sourced from the original manufacturer or authorized distributors?
All KA75330ZBU 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 KA75330ZBU meets industry standards.
7.What is the process for return or replacement of KA75330ZBU?
All KA75330ZBU units undergo pre-shipment inspection (PSI). If there is an issue with KA75330ZBU, 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 KA75330ZBU part is unused and in its original packaging.
Return procedure for KA75330ZBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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