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Analog Devices Inc./Maxim Integrated MAX9644EUK+T
- Part No.:
- MAX9644EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX9644EUK+T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,484
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Product details
Overview
The MAX9644EUK+T from Maxim Integrated is a nanoPower single comparator with integrated 0.2V precision reference, noninverting input configuration, and open-drain output-designed for ultra-low-power, space-constrained portable electronics. It operates from 1.0V to 5.5V supply, draws ≤700nA supply current, features -0.3V to +5.5V input voltage range independent of VCC, and delivers 15µs propagation delay across -40°C to +85°C.
For engineers reviewing the MAX9644EUK+T datasheet, MAX9644EUK+T pinout, MAX9644EUK+T application, or MAX9644EUK+T equivalent, this device serves as a drop-in solution for battery-monitoring, low-voltage threshold detection, and microcontroller wake-up circuits where board area and quiescent current are critical constraints.
Technical Context
The MAX9644EUK+T implements a BiCMOS input stage enabling rail-to-rail input operation beyond VCC (up to +6V relative to GND), while maintaining high input impedance even when VCC = 0V-enabling flexible power-gating schemes. Its internal 0.2V reference is trimmed to ±1% at +25°C and exhibits only ±3.5% drift over -40°C to +85°C, with 6µV/°C tempco.
As an open-drain comparator, it requires an external pullup but supports level-shifting across logic domains; its output sinks up to 1.2mA at VCC = 5.5V with VOL ≤ 0.5V, and exhibits 14ns fall time into 10pF load. Propagation delay remains stable across temperature (14–17µs) and input overdrive (10–250mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0V to 5.5V - enables direct interface with sub-1.2V microcontrollers and single-cell Li-ion/LiFePO₄ systems |
| Quiescent Supply Current | ≤700nA max - extends battery life in multi-year sensor nodes and wearables |
| Input Voltage Range | -0.3V to +5.5V - allows input signals to exceed VCC without clamping diodes or external protection |
| Reference Voltage Accuracy | ±1% at +25°C, ±3.5% over -40°C to +85°C - eliminates need for external reference in cost-sensitive designs |
| Propagation Delay | 15µs typical at ±100mV overdrive - balances speed and ultra-low power for wake-up and alert functions |
| Output Type | Open-drain - supports wired-OR logic, mixed-voltage I/O, and microcontroller GPIO with internal pullup |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade portable medical devices and automotive infotainment accessories |
Pinout & Package
MAX9644EUK+T is housed in a RoHS-compliant 5-pin SOT23 package (1.6mm × 2.9mm × 1.1mm), optimized for reflow assembly and manual inspection. The package includes exposed pad for thermal relief and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply input - must be bypassed with 0.1µF capacitor to GND near pin for stable reference and noise immunity |
| 2 | GND | Ground reference - shared return path for supply, reference, and output; connects to PCB ground plane |
| 3 | GND | Second ground terminal - reduces ground bounce and improves PSRR by separating analog and digital return paths |
| 4 | IN | Noninverting input - accepts signals from -0.3V to +5.5V regardless of VCC; high-Z (>10¹²Ω) when powered down |
| 5 | OUT | Open-drain output - requires external pullup (e.g., 10kΩ to 3.3V); sinks ≥1.2mA at VCC = 5.5V with VOL ≤ 0.5V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.2V Reference | Trimmed to ±1% accuracy at +25°C with 6µV/°C tempco - replaces external reference ICs and saves BOM cost and board area |
| Ultra-Low Input Bias Current | 0.06nA typical - minimizes loading on high-impedance sensors (e.g., thermistors, photodiodes) without signal degradation |
| Power-Down Immunity | Maintains >10¹²Ω input impedance with VCC = 0V - enables safe "always-on" sensing during system sleep modes |
| RF-Immune Input Stage | On-chip filtering suppresses RF interference from cellular/WiFi bands - eliminates need for external RC filters on IN trace |
| Wide Input Common-Mode Range | Operates with inputs 0.3V below GND or 0.3V above VCC - supports ground-referenced and floating-sensor interfaces |
Applications
| Battery Voltage Monitor | Microcontroller Wake-Up Trigger |
|---|---|
Use Scenario: Detecting low battery condition in coin-cell-powered IoT sensors before shutdown. IC Role / Device Role / Timing Role: Comparator compares battery voltage against internal 0.2V reference scaled via resistor divider to set precise 2.4V trip point. Use Value: 700nA quiescent current ensures <1% annual battery drain; -0.3V to +5.5V input range accommodates full discharge curve without external level shifters. |
Use Scenario: Waking an ARM Cortex-M0+ MCU from deep-sleep mode upon external event (e.g., button press or motion detection). IC Role / Device Role / Timing Role: Open-drain output drives MCU's interrupt-capable GPIO; noninverting input monitors switch closure referenced to GND. Use Value: 15µs propagation delay guarantees sub-20µs response; VCC = 1.0V operation matches MCU's lowest active voltage rail. |
| Portable Medical Sensor Threshold | Low-Power LED Dimming Control |
Use Scenario: Alert generation in wearable pulse oximeters when SpO₂ drops below clinical threshold. IC Role / Device Role / Timing Role: Compares amplified photodiode signal against 0.2V reference to trigger visual/audio alarm via MCU. Use Value: ±3.5% reference drift over -40°C to +85°C ensures consistent tripping across body-worn temperature ranges; RF filtering prevents false triggers from EMI. |
Use Scenario: Enabling adaptive dimming in battery-powered smart lighting using ambient light sensor feedback. IC Role / Device Role / Timing Role: Noninverting comparator compares ALS output to 0.2V reference to toggle LED driver enable line. Use Value: 1.0V minimum supply allows co-location with 1.2V LDO; open-drain output interfaces directly to 3.3V LED driver control logic without level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDBVR | 0.2V reference, 600nA IQ, SOT23-5, but inverting-only input and no guaranteed -0.3V input capability | Requires signal inversion in circuit layout; less robust for negative transient tolerance | Select when inverting topology suffices and absolute min VCC = 1.4V is acceptable |
| MAX40006EUT+T | 0.2V reference, 900nA IQ, SOT23-5, push-pull output, but no guaranteed input beyond VCC | Eliminates external pullup but lacks rail-to-rail input flexibility; higher IQ increases battery load | Select when push-pull drive is mandatory and input stays within 0–VCC range |
Compared with TLV3691IDBVR and MAX40006EUT+T, the MAX9644EUK+T uniquely combines noninverting input, true beyond-rail input range (-0.3V to +5.5V), and lowest guaranteed IQ (700nA max), making it optimal for ultra-low-power, mixed-voltage, and fault-tolerant sensing nodes.
Availability
MAX9644EUK+T is available at Aetrix Electronics and suitable for battery-powered wearables, portable medical diagnostics, and industrial handheld instruments requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX9644EUK+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and consumer applications.
The MAX9644EUK+T belongs to Maxim's nanoPower comparator family, engineered specifically for energy-harvesting and multi-year battery-operated systems where every nanoamp and square millimeter matters.
FAQ
What is the maximum input voltage the MAX9644EUK+T can tolerate relative to GND?
The MAX9644EUK+T supports an input voltage range of -0.3V to +5.5V relative to GND, independent of VCC level. This allows signals to safely exceed the supply rail-critical for interfacing with unregulated sensors or legacy analog sources. Absolute maximum rating extends to +6V, but sustained operation above +5.5V is not guaranteed per specification.
Does the MAX9644EUK+T require an external pullup resistor on its output?
Yes, the MAX9644EUK+T features an open-drain output and requires an external pullup resistor (e.g., 10kΩ to VPULLUP) for proper logic-level assertion. This enables level-shifting across voltage domains-for example, driving a 3.3V microcontroller GPIO while operating from a 1.2V supply. The device itself does not provide internal pullup.
Can the MAX9644EUK+T operate with a 1.0V supply and still meet all specifications?
Yes, the MAX9644EUK+T is fully specified down to VCC = 1.0V, including propagation delay (15µs), output low voltage (VOL ≤ 0.2V at 50µA), and reference accuracy (±3.5% over temperature). Its 700nA max supply current is guaranteed across the entire 1.0V–5.5V range, making it ideal for single-cell alkaline or LiFePO₄ systems.
How accurate is the internal 0.2V reference in the MAX9644EUK+T over temperature?
The internal reference is trimmed to ±1% accuracy at +25°C and maintains ±3.5% accuracy across the full -40°C to +85°C operating range. Its 6µV/°C tempco ensures predictable drift-e.g., ~0.5mV change over 85°C span-enabling reliable threshold setting in portable medical and industrial environments without calibration.
Is the MAX9644EUK+T pin-compatible with other variants in the MAX964x family?
No-the MAX9644EUK+T shares the same 5-pin SOT23 footprint with MAX9645EUK+ and MAX9646EUK+, but differs in input polarity (noninverting) and output type (open-drain). Swapping with MAX9645EUK+ (inverting) or MAX9646EUK+ (push-pull) requires schematic and firmware changes due to functional mismatch, despite identical pinout.
MAX9644EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 1V ~ 5.5V
- :
- -
- Voltage - Input Offset (Max):
- 0.015µA
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 1.1µA
- Current - Quiescent (Max):
- 53dB PSRR
- CMRR, PSRR (Typ):
- 15µs
- Propagation Delay (Max):
- 0.9mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
MAX9644EUK+T FAQ
1.How can I place an order for MAX9644EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9644EUK+T 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 MAX9644EUK+T reliable?
The price and inventory of MAX9644EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9644EUK+T is usually 5 days.
3.What payment methods are accepted for MAX9644EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9644EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9644EUK+T?
MAX9644EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9644EUK+T 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 MAX9644EUK+T?
For technical support, including MAX9644EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9644EUK+T requirements.
6.How does Aetrix verify that MAX9644EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX9644EUK+T 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 MAX9644EUK+T meets industry standards.
7.What is the process for return or replacement of MAX9644EUK+T?
All MAX9644EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9644EUK+T, 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 MAX9644EUK+T part is unused and in its original packaging.
Return procedure for MAX9644EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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