My Inquiry
My Account
Renesas ISL21440IRTZ
- Part No.:
- ISL21440IRTZ
- Manufacturer:
- Renesas
- Category:
- Comparators
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL21440IRTZ.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL21440IRTZ 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, 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-battery and reset circuits.
For engineers reviewing the ISL21440IRTZ datasheet, ISL21440IRTZ pinout, ISL21440IRTZ application, or ISL21440IRTZ equivalent, this page provides verified package mapping (8 Ld TDFN), validated pin functions, confirmed comparator propagation delays (tPHL = 50–100 µs), real-world hysteresis implementation guidance, and direct alternatives for low-voltage supervisory designs requiring <2.5µA total circuit current.
Technical Context
The ISL21440IRTZ integrates a factory-trimmed FGA voltage reference (1.182V ±0.5%) and a rail-to-rail CMOS push-pull comparator on a single die. Its dual-supply capability (V+ and V− pins) enables operation with split bipolar supplies (±1.0V to ±5.5V) or single-ended configurations where V− = GND.
Comparator functionality includes programmable hysteresis via the HYST pin (accepting REF − 50mV to REF), input common-mode range from V− to V+ − 1.5V, and output swing referenced to V+ and GND. The reference section sources up to 2mA but sinks only 10µA, requiring careful load design for sink-heavy applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.182V ±0.5% (factory-trimmed; supports accurate 2.7V low-battery trip with 2.4M/1.8M divider) |
| Supply Current | ≤6.5µA max across –40°C to +125°C (enables >10-year coin-cell operation in always-on monitors) |
| Supply Range | 2V to 11V single supply or ±1.0V to ±5.5V split supply (supports wide-input industrial and automotive sensors) |
| Comparator Propagation Delay | tPHL = 50 µs / tPLH = 100 µs @ 100mV overdrive (defines minimum detectable voltage transient duration) |
| Hysteresis Input Range | REF − 50mV to REF (enables 0–50mV programmable hysteresis window for noise rejection) |
| Output Drive | CMOS push-pull: VOH ≥ V+ − 0.6V @ −6mA, VOL ≤ GND + 0.6V @ 1.8mA (directly drives logic inputs without pull-ups) |
| Operating Temperature | –40°C to +125°C (qualified for under-hood automotive and industrial edge nodes) |
Pinout & Package
ISL21440IRTZ is packaged in an 8-lead TDFN (3mm × 3mm, RoHS-compliant, pkg drawing L8.3x3G) with exposed thermal pad. Pin 1 index area located at top-left corner; pin numbering counterclockwise from index.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Sets comparator output low level; must be connected to system ground in single-supply mode |
| V− (Pin 2) | Negative supply input | Enables split-supply operation; tied to GND for single-supply use (2V–11V V+ range) |
| IN+ (Pin 3) | Comparator noninverting input | Accepts input signals from V− to V+ − 1.5V; used for threshold comparison against reference |
| IN− (Pin 4) | Comparator inverting input | Accepts input signals from V− to V+ − 1.5V; typically connected to resistor divider for voltage monitoring |
| HYST (Pin 5) | Hysteresis control input | Accepts voltage from REF via resistor divider; sets hysteresis width (0–50mV); tie to REF for zero hysteresis |
| REF (Pin 6) | Reference output | Provides 1.182V ±0.5%; sources up to 2mA, sinks only 10µA - avoid heavy sink loads |
| V+ (Pin 7) | Positive supply input | Primary power rail; supports 2V–11V; requires 0.1µF decoupling if load >1mA |
| OUT (Pin 8) | Comparator output | CMOS push-pull; rail-to-rail swing (GND to V+); directly interfaces with MCU GPIO or reset controllers |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 6.5µA max ICC enables multi-year battery life in portable medical and IoT endpoint devices |
| Integrated reference + comparator | Single-chip solution eliminates external reference IC and comparator, reducing BOM count and PCB area by >40% |
| User-programmable hysteresis | Configurable 0–50mV hysteresis window via two external resistors prevents chatter in noisy low-voltage detection |
| Rail-to-rail CMOS output | Push-pull OUT drives standard TTL/CMOS logic without external pull-up resistors or level shifters |
| Wide temperature range | Specified performance from –40°C to +125°C ensures reliability in automotive engine compartments and industrial enclosures |
Applications
| Low Battery Detector | Low Voltage Reset |
|---|---|
|
Use Scenario: Monitoring Li-ion or alkaline cell voltage during discharge to trigger shutdown before deep discharge damage. IC Role / Device Role / Timing Role: ISL21440IRTZ compares battery voltage (via resistor divider) against its internal 1.182V reference; hysteresis prevents oscillation near trip point. Use Value: Total circuit current <1.1µA extends battery life; 2.7V trip point accuracy ±15mV ensures safe cutoff without premature shutdown. |
Use Scenario: Generating a clean, glitch-free reset signal when main supply drops below safe operating voltage. IC Role / Device Role / Timing Role: ISL21440IRTZ acts as a precision undervoltage detector; OUT asserts low when VDD falls below programmed threshold. Use Value: 6.5µA quiescent current avoids loading weak supplies; CMOS output directly resets microcontrollers without external conditioning. |
| Overvoltage Monitor | Window Comparator |
|
Use Scenario: Protecting downstream circuitry from supply overvoltage events in DC power rails or battery chargers. IC Role / Device Role / Timing Role: ISL21440IRTZ configured with IN+ tied to VDD and IN− to REF; triggers OUT high when VDD exceeds threshold. Use Value: 11V absolute max V+ rating allows direct connection to 9V/12V rails; 50mV hysteresis prevents false trips during ripple. |
Use Scenario: Validating that sensor or supply voltage remains within defined upper and lower bounds (e.g., 3.3V ±5%). IC Role / Device Role / Timing Role: ISL21440IRTZ provides lower threshold; paired with second comparator (e.g., ISL28197) for upper threshold. Use Value: Combined circuit draws ~3µA; operates down to VDD = 2.2V; enables reliable in-window/out-of-window status reporting. |
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 supply current (9µA typ), same 1.182V reference, no V− pin (single-supply only), MSOP-8 package | Lacks split-supply capability and has higher quiescent current - unsuitable for ultra-low-power or bipolar-sensor interfaces | Select ISL21440IRTZ when <6.5µA operation, split-supply support, or TDFN footprint is required |
| MAX921ESA+ | 1.235V reference (±1%), 12µA supply current, open-drain output, SO-8 package, no programmable hysteresis | Requires external pull-up; fixed reference reduces trip-point flexibility; higher current limits battery life | Choose ISL21440IRTZ for precise 1.182V threshold, push-pull output, and hysteresis tuning in space-constrained designs |
Compared with LTC1440CMS8#PBF and MAX921ESA+, the ISL21440IRTZ offers the lowest supply current (≤6.5µA), integrated hysteresis programming, rail-to-rail CMOS output, and dual-supply capability - making it optimal for long-life battery monitors and compact industrial sensors where layout area and power budget are critical.
Availability
ISL21440IRTZ is available at Aetrix Electronics and suitable for low-battery detection, undervoltage reset, and overvoltage monitoring applications requiring stable component supply, extended temperature operation, and ultra-low quiescent current.
Supply support for ISL21440IRTZ 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, reliable solutions for automotive, industrial, infrastructure, and IoT applications.
The ISL21440IRTZ belongs to Renesas' precision analog portfolio, engineered specifically for micropower supervisory functions in battery-critical and harsh-environment systems.
FAQ
What is the maximum hysteresis voltage achievable with ISL21440IRTZ?
The ISL21440IRTZ supports a programmable hysteresis range of 0 mV to 50 mV, set by connecting resistors between REF and HYST pins. The hysteresis voltage VH equals twice the difference between VREF and VHYST (VH = 2 × (VREF − VHYST)). With VREF = 1.182 V, the maximum VHYST = VREF − 50 mV = 1.132 V yields VH = 50 mV. This value is confirmed in the datasheet's hysteresis application equations and Figures 13–17.
Can ISL21440IRTZ operate with a 1.8V supply?
No, ISL21440IRTZ cannot operate with a 1.8V supply. Its absolute minimum supply voltage is 2.0V (per Absolute Maximum Ratings and Recommended Operating Conditions). At V+ = 2.0V, the comparator input common-mode range extends only to V+ − 1.5V = 0.5V, and reference regulation may degrade. Operation below 2.0V risks failure to meet specifications and is outside qualified conditions.
What is the sink capability of the REF pin on ISL21440IRTZ?
The REF pin on ISL21440IRTZ can sink up to 10 µA maximum (per datasheet Analog Specifications, Page 4). Exceeding this limit causes output voltage droop beyond specification. For sink-heavy loads, external buffering or alternative reference architectures are required. The 10 µA sink rating is explicitly stated in both V+ = 5V and V+ = 3V electrical tables.
Is ISL21440IRTZ pin-compatible with ISL21440IUZ?
Yes, ISL21440IRTZ (8 Ld TDFN) and ISL21440IUZ (8 Ld MSOP) share identical pinout and function mapping per the Pin Configuration diagram (Page 2) and Pin Descriptions table (Page 2). Both packages have GND at Pin 1, V− at Pin 2, IN+ at Pin 3, IN− at Pin 4, HYST at Pin 5, REF at Pin 6, V+ at Pin 7, and OUT at Pin 8 - enabling direct PCB footprint substitution where thermal and size constraints allow.
Does ISL21440IRTZ require an external capacitor on the REF pin?
An external capacitor on the REF pin is optional and used only to reduce output noise. The datasheet states "Small value capacitors, up to 10nF, can be used on the reference output to lower noise if desired." No capacitor is required for basic regulation or comparator operation. However, if high-precision DC accuracy is needed, board-level layout best practices (short traces, ground plane) are more critical than capacitance.
ISL21440IRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 8-WFDFN Exposed Pad
- 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-TDFN (3x3)
ISL21440IRTZ FAQ
1.How can I place an order for ISL21440IRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL21440IRTZ 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 ISL21440IRTZ reliable?
The price and inventory of ISL21440IRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL21440IRTZ is usually 5 days.
3.What payment methods are accepted for ISL21440IRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL21440IRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL21440IRTZ?
ISL21440IRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL21440IRTZ 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 ISL21440IRTZ?
For technical support, including ISL21440IRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL21440IRTZ requirements.
6.How does Aetrix verify that ISL21440IRTZ is sourced from the original manufacturer or authorized distributors?
All ISL21440IRTZ 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 ISL21440IRTZ meets industry standards.
7.What is the process for return or replacement of ISL21440IRTZ?
All ISL21440IRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL21440IRTZ, 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 ISL21440IRTZ part is unused and in its original packaging.
Return procedure for ISL21440IRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL21440IRTZ Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
