My Inquiry
My Account
Renesas ISL21440IRTZ-T13
- Part No.:
- ISL21440IRTZ-T13
- Manufacturer:
- Renesas
- Category:
- Comparators
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL21440IRTZ-T13.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,835
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL21440IRTZ-T13 from Renesas Electronics is a micropower voltage reference with integrated comparator, designed for low-voltage 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 detectors.
For engineers reviewing the ISL21440IRTZ-T13 datasheet, ISL21440IRTZ-T13 pinout, ISL21440IRTZ-T13 application, or ISL21440IRTZ-T13 equivalent, this page provides verified technical context, package-specific pin functions, real-world design meaning of key specs, and two validated alternative parts for low-power voltage monitoring circuits requiring stable trip points and minimal quiescent current.
Technical Context
The ISL21440IRTZ-T13 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 supports V+ (2V–11V) and V– (down to –5.5V), enabling operation with split rails or single-ended ground-referenced configurations.
Comparator inputs accept common-mode voltages from V– to (V+ – 1.5V); hysteresis is implemented via external resistor divider between REF and HYST pins, allowing programmable switching thresholds from 0mV to 50mV. Output drives TTL/CMOS loads with VOH ≥ (V+ – 0.6V) at –6mA and VOL ≤ (GND + 0.6V) at 1.8mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.182V ±0.5% - enables accurate 2.7V low-battery detection using standard resistor dividers without calibration. |
| Supply Current | ≤6.5µA max over –40°C to +125°C - extends shelf life and runtime in coin-cell or energy-harvesting applications. |
| Supply Range | 2V to 11V single or ±1.0V to ±5.5V split - supports wide input voltage domains including Li-ion, alkaline, and industrial rails. |
| Hysteresis Range | 0mV to 50mV - suppresses false triggering from noise on battery voltage or sensor inputs in portable equipment. |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood, industrial control, and extended-temperature IoT nodes. |
| Output Type | CMOS push-pull - eliminates need for external pull-up resistors, reducing BOM count and board space in compact designs. |
| Input Offset Voltage | ±3.6mV max (TDFN package) - ensures reliable detection margin when sensing small voltage differentials near reference level. |
Pinout & Package
ISL21440IRTZ-T13 is packaged in an 8-lead TDFN (3mm × 3mm, 0.75mm height, RoHS-compliant, L8.3x3G outline) with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference for comparator output low level | Must be connected to system ground; defines VOL and serves as return path for reference sink current (max 10µA). |
| V– | Negative supply input for reference and comparator | Enables true bipolar operation; tie to GND for single-supply use; minimum V+–V– = 0.8V required for full input range. |
| IN+ | Comparator noninverting input | Accepts input signals from V– to (V+ – 1.5V); used for sensed voltage (e.g., battery divider output) in low-battery detection. |
| IN– | Comparator inverting input | Typically connected to REF (1.182V); sets trip threshold; high-impedance (leakage ≤1.5nA) permits megaohm-level divider networks. |
| HYST | Hysteresis control input | Accepts voltage from REF–50mV to REF; external resistor divider here configures hysteresis width without affecting reference accuracy. |
| REF | Precision reference output | Provides 1.182V ±0.5%; sources up to 2mA but sinks only 10µA - requires high-impedance loading or buffering for >10µA sink loads. |
| V+ | Positive supply input | Supplies both reference and comparator; operates from 2V to 11V; decoupling capacitor (0.1µF) recommended for loads >1mA. |
| OUT | Comparator output | CMOS push-pull; swings rail-to-rail (GND to V+); drives logic inputs directly; no external pull-up needed. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 6.5µA max ICC enables >10-year shelf life in CR2032-powered devices with periodic wake-up monitoring. |
| Programmable hysteresis | 0–50mV range allows precise noise margin tuning without redesigning comparator feedback network. |
| Single-chip reference + comparator | Eliminates discrete op-amp + bandgap IC solution, reducing PCB area by >40% and component count by 3–5 parts. |
| Wide supply flexibility | 2V–11V single or ±1.0V–±5.5V split operation supports legacy and next-gen power architectures without redesign. |
| TDFN thermal performance | θJA = 68°C/W and θJC = 8°C/W enable stable operation in thermally constrained enclosures without heatsinking. |
Applications
| Low Battery Detector | Low Voltage Reset |
|---|---|
Use Scenario: Monitoring lithium coin-cell voltage in medical wearables to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Reference sets 2.7V trip point; comparator asserts LoBAT– signal when battery drops below threshold. Use Value: 6.5µA supply current extends usable battery life by >30% versus discrete solutions; 1.182V reference enables exact trip-point setting with 1% resistors. | Use Scenario: Ensuring microcontroller reset during brown-out in industrial sensors powered from 3.3V LDOs. IC Role / Device Role / Timing Role: Comparator output drives MCU's active-low RESET pin; hysteresis prevents chatter during slow VDD ramp-up/down. Use Value: 50mV hysteresis guarantees clean, bounce-free reset assertion/deassertion; TDFN package fits tight 4mm² layout constraints. |
| Overvoltage Monitor | Window Comparator |
Use Scenario: Protecting USB-C PD input stage from transient overvoltage events exceeding 5.5V. IC Role / Device Role / Timing Role: IN+ monitors scaled bus voltage; OUT asserts fault flag when VBUS exceeds 5.5V threshold derived from REF. Use Value: 125°C rating ensures reliability in hot-plug environments; CMOS output interfaces directly with FPGA I/O banks. | Use Scenario: Validating analog sensor output stays within ±5% window in automotive cabin temperature modules. IC Role / Device Role / Timing Role: ISL21440IRTZ-T13 provides lower threshold; paired micropower comparator (e.g., ISL28197) provides upper threshold. Use Value: Combined circuit draws <3µA total; 1.182V reference enables symmetric 2.7V/3.8V window with 1% resistor matching. |
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), MSOP-8 package, no V– pin (single-supply only), ±1.5% reference accuracy | Limited to single-supply systems; less suitable for extended-temperature or ultra-low-power designs | Select when cost sensitivity outweighs power/performance needs and split-supply operation is unnecessary. |
| MAX921ESA+ | 5µA supply current, SO-8 package, 1.25V reference (±2%), no programmable hysteresis (fixed 5mV) | Fixed hysteresis restricts noise immunity tuning; 1.25V reference requires resistor recalibration for same trip points | Select when board space allows SO-8 and fixed 5mV hysteresis meets system noise floor requirements. |
Compared with LTC1440CMS8#PBF and MAX921ESA+, the ISL21440IRTZ-T13 offers tighter reference accuracy (±0.5% vs ±1.5%/±2%), lower max supply current (6.5µA vs 9µA/5µA), programmable hysteresis (0–50mV vs fixed), and TDFN packaging for higher density - making it optimal for next-gen portable and automotive monitoring.
Availability
ISL21440IRTZ-T13 is available at Aetrix Electronics and suitable for low-battery detection, low-voltage reset, and overvoltage monitor circuits requiring stable component supply, long-term calibration retention, and extended temperature operation.
Supply support for ISL21440IRTZ-T13 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, low-power analog and mixed-signal solutions for automotive, industrial, and IoT markets.
The ISL21440 belongs to Renesas' precision micropower analog portfolio, engineered specifically for battery-critical monitoring applications where reference stability, ultra-low quiescent current, and integrated decision-making (comparator) are essential.
FAQ
What is the maximum hysteresis voltage achievable with ISL21440IRTZ-T13?
The ISL21440IRTZ-T13 supports hysteresis voltages from 0mV to 50mV, set by the voltage difference between REF and HYST pins. This is achieved using two external resistors (RREF and RHYST) per Equation 1 and Equation 2 in the datasheet. The 50mV maximum corresponds to VHYST = REF – 50mV, enabling robust noise rejection in electrically noisy environments such as motor-driven or RF-adjacent systems. ISL21440IRTZ-T13 maintains this hysteresis range across its full –40°C to +125°C operating temperature.
Can ISL21440IRTZ-T13 operate with split supplies, and what are the limits?
Yes, ISL21440IRTZ-T13 supports true split-supply operation with V+ ranging from +1.0V to +5.5V and V– ranging from –1.0V to –5.5V, yielding a total supply span of up to 11V. The minimum differential |V+ – V–| must be ≥0.8V for full input common-mode range. GND remains tied to system ground and defines the comparator output low level. This configuration enables direct interfacing with bipolar sensor outputs or legacy industrial signal chains without level-shifting circuitry. ISL21440IRTZ-T13 retains its 1.182V reference accuracy and 6.5µA supply current spec under split-rail conditions.
What is the sink capability of the REF pin on ISL21440IRTZ-T13?
The REF pin on ISL21440IRTZ-T13 is specified to sink up to 10µA maximum while maintaining output regulation within ±0.5% of 1.182V. This limited sink current necessitates high-impedance loading - for example, using ≥100kΩ resistors in hysteresis or divider networks. Exceeding 10µA sink load causes measurable droop (up to –2.5mV per datasheet), degrading trip-point accuracy. For applications requiring higher sink current, ISL21440IRTZ-T13 must be buffered with an op-amp or driven into a high-Z comparator input like IN–. The 2mA source capability remains unaffected.
How does the TDFN package of ISL21440IRTZ-T13 impact thermal performance?
The 8-lead TDFN package (L8.3x3G) of ISL21440IRTZ-T13 delivers θJA = 68°C/W and θJC = 8°C/W - significantly better than the MSOP variant (θJA = 154°C/W). This enables higher power efficiency in thermally constrained spaces: at 6.5µA supply current, junction temperature rise is <0.5°C above ambient, eliminating thermal drift concerns in sealed enclosures. The exposed thermal pad must be soldered to a PCB copper pour for optimal heat transfer. ISL21440IRTZ-T13's TDFN footprint also saves >35% board area versus MSOP, critical for wearables and miniaturized IoT nodes.
Is ISL21440IRTZ-T13 pin-compatible with older industry-standard references?
Yes, ISL21440IRTZ-T13 is explicitly documented as pin-compatible with LTC1440, LTC1540, MAX921, and MAX931 in the same 8-lead MSOP or TDFN footprints. Pin mapping (GND, V–, IN+, IN–, HYST, REF, V+, OUT) matches identically across these parts. However, ISL21440IRTZ-T13 improves upon them with tighter reference accuracy (±0.5% vs ±1.5–2%), lower supply current (6.5µA vs 5–9µA), and programmable hysteresis (0–50mV vs fixed or none). No PCB changes are required for drop-in replacement, though resistor values may need adjustment to leverage enhanced specs. ISL21440IRTZ-T13 maintains full functional compatibility.
ISL21440IRTZ-T13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 8-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-T13 FAQ
1.How can I place an order for ISL21440IRTZ-T13 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL21440IRTZ-T13 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-T13 reliable?
The price and inventory of ISL21440IRTZ-T13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL21440IRTZ-T13 is usually 5 days.
3.What payment methods are accepted for ISL21440IRTZ-T13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL21440IRTZ-T13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL21440IRTZ-T13?
ISL21440IRTZ-T13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL21440IRTZ-T13 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-T13?
For technical support, including ISL21440IRTZ-T13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL21440IRTZ-T13 requirements.
6.How does Aetrix verify that ISL21440IRTZ-T13 is sourced from the original manufacturer or authorized distributors?
All ISL21440IRTZ-T13 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-T13 meets industry standards.
7.What is the process for return or replacement of ISL21440IRTZ-T13?
All ISL21440IRTZ-T13 units undergo pre-shipment inspection (PSI). If there is an issue with ISL21440IRTZ-T13, 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-T13 part is unused and in its original packaging.
Return procedure for ISL21440IRTZ-T13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL21440IRTZ-T13 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
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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…
