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Renesas ISL21440IUZ
- Part No.:
- ISL21440IUZ
- Manufacturer:
- Renesas
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL21440IUZ.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,118
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Product details
Overview
ISL21440IUZ from Renesas Electronics is a micropower voltage reference with integrated comparator, designed for ultra-low-power monitoring in battery-powered systems. It delivers a precision 1.182V ±0.5% reference output, draws ≤6.5µA supply current across –40°C to +125°C, operates from 2V to 11V single or split supplies, and features user-programmable hysteresis for noise-immune threshold detection in low-voltage reset circuits.
For engineers reviewing the ISL21440IUZ datasheet, ISL21440IUZ pinout, ISL21440IUZ application, or ISL21440IUZ equivalent, this device supports critical functions including low-battery detection, overvoltage monitoring, window comparators, and supply rail supervision where sub-µA quiescent current and factory-trimmed reference accuracy are mandatory design requirements.
Technical Context
The ISL21440IUZ integrates a micropower FGA (Floating Gate Analog) voltage reference and a rail-to-rail CMOS comparator on a single die. Its reference section provides 1.182V ±0.5% initial accuracy with ±2.5mV load regulation over 0–2mA sourcing and 0–10µA sinking, while the comparator offers programmable hysteresis via the HYST pin, TTL/CMOS-compatible push-pull output, and input common-mode range from V− to V+ −1.5V.
It supports dual-supply operation (±1.0V to ±5.5V) via separate V+ and V− pins, with GND tied to V− in single-supply configurations. Propagation delays are 50–200µs depending on overdrive, and input offset voltage is ±3.25mV (MSOP package) across temperature, enabling reliable threshold detection in harsh industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.182V ±0.5% - Factory-trimmed precision baseline for accurate threshold generation. |
| Supply Current | ≤6.5µA max across –40°C to +125°C - Enables multi-year battery life in coin-cell applications. |
| Supply Range | 2V to 11V single supply or ±1.0V to ±5.5V split supply - Supports wide input rail flexibility. |
| Comparator Output | CMOS push-pull, VOH = V+ − 0.6V @ −6mA, VOL = GND + 0.6V @ 1.8mA - Direct logic-level interfacing without external pull-ups. |
| Hysteresis Control | VHYST input accepts REF − 50mV to REF - Enables precise, resistor-programmable hysteresis up to 50mV. |
| Operating Temperature | –40°C to +125°C - Qualified for automotive under-hood and industrial control environments. |
| Package | 8-lead MSOP (M8.118) - Surface-mount footprint with 3.0mm × 3.0mm body and 0.65mm pitch. |
Pinout & Package
ISL21440IUZ is housed in an 8-lead MSOP package (JEDEC MO-187-AA compliant, outline M8.118), with exposed pad not connected internally. Pin 1 is marked by a dot or beveled corner at top-left when viewed from top with pin 1 identifier in upper-left quadrant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference for comparator output low level | Sets output logic LOW state; must be connected to system ground in single-supply use. |
| V− (Pin 2) | Negative supply input for reference and comparator | Enables true split-supply operation; tied to GND in single-supply configurations. |
| IN+ (Pin 3) | Comparator noninverting input | Accepts signals from V− to V+ − 1.5V; used for threshold comparison against reference. |
| IN− (Pin 4) | Comparator inverting input | Accepts signals from V− to V+ − 1.5V; typically connected to resistive divider for voltage monitoring. |
| HYST (Pin 5) | Hysteresis voltage input | Programs switching threshold offset; connect to REF for zero hysteresis or to resistor divider for 12.5–50mV hysteresis. |
| REF (Pin 6) | Precision reference output | Provides 1.182V ±0.5%; sources up to 2mA, sinks only 10µA - limits sink-side loading. |
| V+ (Pin 7) | Positive supply input | Supplies both reference and comparator; valid from 2.0V to 11.0V; requires 0.1µF decoupling if load >1mA. |
| OUT (Pin 8) | Comparator output | CMOS push-pull; swings rail-to-rail (GND to V+) - drives logic inputs directly without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 6.5µA max ICC enables >10-year battery life in coin-cell–powered monitors. |
| Factory-trimmed reference | 1.182V ±0.5% initial accuracy eliminates external calibration in production. |
| User-programmable hysteresis | Resistor-based HYST pin interface allows precise noise immunity tuning from 0 to 50mV. |
| Rail-to-rail CMOS output | Push-pull OUT drives TTL/CMOS loads directly - no pull-up resistor required. |
| Split-supply capability | Separate V+ and V− pins support ±1.0V to ±5.5V operation for bipolar signal monitoring. |
| High-temp qualification | Specified from –40°C to +125°C - suitable for automotive and industrial under-hood use. |
Applications
| Low Battery Detector | Low Voltage Reset |
|---|---|
Use Scenario: Monitoring lithium coin-cell or alkaline battery voltage during deep discharge. IC Role / Device Role / Timing Role: ISL21440IUZ compares divided battery voltage against its internal 1.182V reference to assert LoBAT− signal. Use Value: Draws <1.1µA total circuit current, extending battery service life beyond 5 years in standby. |
Use Scenario: Generating clean power-on reset pulse for microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: ISL21440IUZ triggers reset when VDD falls below programmable threshold set by resistor divider on IN−. Use Value: Programmable hysteresis prevents chatter during slow supply ramp-up/down transitions. |
| Overvoltage Monitor | Window Comparator |
Use Scenario: Protecting sensitive analog front-ends from supply rail overvoltage events. IC Role / Device Role / Timing Role: ISL21440IUZ acts as lower comparator in dual-threshold protection circuit, asserting fault when input exceeds upper limit. Use Value: 2V–11V supply range allows direct monitoring of 3.3V, 5V, or 9V rails without level-shifting. |
Use Scenario: Validating that sensor supply or ADC reference remains within safe operating band. IC Role / Device Role / Timing Role: ISL21440IUZ provides precise lower threshold; paired with micropower comparator (e.g., ISL28197) for upper threshold. Use Value: Total circuit current <3µA enables continuous monitoring in always-on IoT edge nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference + comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1440CMS8#PBF | Higher 12µA supply current; 1.25V reference; no programmable hysteresis - fixed 5mV typical. | Less suitable for ultra-low-power battery monitoring; limited hysteresis flexibility affects noise rejection. | Select ISL21440IUZ when sub-7µA operation and adjustable hysteresis are required. |
| MAX921ESA+ | 5µA supply current; 1.235V reference; hysteresis not user-programmable - internal only. | Lower quiescent current but inflexible hysteresis; lacks split-supply V− pin for bipolar operation. | Choose ISL21440IUZ for designs needing V− pin flexibility and precise hysteresis tuning via external resistors. |
Compared with LTC1440CMS8#PBF and MAX921ESA+, the ISL21440IUZ provides superior micropower performance (≤6.5µA), factory-trimmed 1.182V reference, and externally programmable hysteresis - making it optimal for long-life battery monitors requiring configurable noise immunity and dual-supply support.
Availability
ISL21440IUZ is available at Aetrix Electronics and suitable for low-battery detection, low-voltage reset, and overvoltage monitor applications requiring stable component supply across automotive, industrial, and portable medical device programs.
Supply support for ISL21440IUZ 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
Renesas Electronics is a global semiconductor leader delivering high-performance, energy-efficient microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets.
The ISL21440IUZ belongs to Renesas' precision analog portfolio, engineered specifically for ultra-low-power voltage monitoring and threshold detection in battery-constrained and high-reliability embedded systems.
FAQ
What is the reference voltage tolerance and temperature coefficient of the ISL21440IUZ?
The ISL21440IUZ provides a factory-trimmed reference voltage of 1.182V with ±0.5% initial tolerance at +25°C. Over the full –40°C to +125°C operating range, the reference drift is characterized per the box method across 165°C span, resulting in typical temperature coefficient of <50ppm/°C. This ensures stable threshold generation in automotive and industrial environments without external trimming.
Can the ISL21440IUZ operate from a single 2.0V supply?
Yes, the ISL21440IUZ operates from a single 2.0V supply with V− tied to GND. At 2.0V, the comparator input common-mode range extends from GND to 0.5V, and the reference remains functional. Supply current is 0.40µA typical at 2.0V, supporting ultra-low-power applications such as coin-cell–powered sensors where minimum supply headroom is critical.
How is hysteresis programmed on the ISL21440IUZ?
Hysteresis on the ISL21440IUZ is programmed by connecting two resistors: RREF between REF and HYST, and RHYST between HYST and GND. The hysteresis voltage VH equals 2×(VREF − VHYST), allowing precise tuning from 0mV (HYST tied to REF) to 50mV (VHYST = REF − 50mV). Equations in the datasheet define exact resistor values based on desired VH and reference output current IREF.
What is the maximum source/sink capability of the ISL21440IUZ reference output?
The REF pin of the ISL21440IUZ can source up to 2mA while maintaining ±2.5mV load regulation, but its sink capability is limited to 10µA maximum. Exceeding 10µA sink current causes >2.5mV deviation from nominal 1.182V. For sink-heavy applications, external buffering or alternative topology is recommended to preserve reference accuracy.
Is the ISL21440IUZ pin-compatible with the MAX921?
Yes, the ISL21440IUZ is explicitly documented as a pin-compatible, performance upgrade to the MAX921 and LTC1440. All eight pins map identically: GND, V−, IN+, IN−, HYST, REF, V+, and OUT. No PCB layout changes are required when upgrading from MAX921ESA+ to ISL21440IUZ, delivering lower supply current (6.5µA vs. 5µA), tighter reference tolerance (±0.5% vs. ±1.0%), and programmable hysteresis.
ISL21440IUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 3.6mV
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 750nA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 200µs
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
ISL21440IUZ FAQ
1.How can I place an order for ISL21440IUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL21440IUZ 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 ISL21440IUZ reliable?
The price and inventory of ISL21440IUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL21440IUZ is usually 5 days.
3.What payment methods are accepted for ISL21440IUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL21440IUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL21440IUZ?
ISL21440IUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL21440IUZ 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 ISL21440IUZ?
For technical support, including ISL21440IUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL21440IUZ requirements.
6.How does Aetrix verify that ISL21440IUZ is sourced from the original manufacturer or authorized distributors?
All ISL21440IUZ 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 ISL21440IUZ meets industry standards.
7.What is the process for return or replacement of ISL21440IUZ?
All ISL21440IUZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL21440IUZ, 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 ISL21440IUZ part is unused and in its original packaging.
Return procedure for ISL21440IUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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