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Analog Devices Inc./Maxim Integrated MAX9021AUK+T
- Part No.:
- MAX9021AUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX9021AUK+T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,400
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Product details
Overview
The MAX9021AUK+T from Analog Devices is a single, micropower, rail-to-rail output comparator optimized for battery-powered portable systems. It operates from 2.5V to 5.5V single supply, draws only 2.8μA supply current, delivers 3μs propagation delay, and integrates 4mV internal hysteresis - enabling robust threshold detection in photodiode preamps and sensor-signal detection circuits.
For engineers reviewing the MAX9021AUK+T datasheet, MAX9021AUK+T pinout, MAX9021AUK+T application, or MAX9021AUK+T equivalent, key selection criteria include ultra-low quiescent current, SC70/SOT23 package compatibility, guaranteed operation over -40°C to +125°C, and noise-immune hysteresis without external components.
Technical Context
The MAX9021AUK+T implements a CMOS input stage with rail-to-rail output swing and no phase reversal under overdrive. Its input common-mode range extends from VSS to VDD − 1.1V, supporting wide-swing signal conditioning at low supply voltages.
Internal 4mV hysteresis is fixed and non-adjustable, eliminating oscillation on slow-moving inputs. Propagation delay remains stable across temperature (−40°C to +125°C) and supply voltage (2.5V–5.5V), with typical tPD = 3μs at VOD = 100mV and CL = 15pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V single supply - enables direct integration into Li-ion and coin-cell powered systems without level-shifting. |
| Supply Current | 2.8μA per comparator - supports >10-year battery life in always-on sensor wake-up circuits. |
| Propagation Delay | 3μs at 100mV overdrive - provides reliable timing margin for 100kHz digital line receiver applications. |
| Hysteresis | 4mV built-in - eliminates false triggering from EMI or thermal noise without external feedback resistors. |
| Input Offset Voltage | ±1mV (typ), ±8mV (max) - ensures accurate threshold discrimination down to sub-10mV signal levels. |
| Output Swing | Rail-to-rail (VOH ≥ VDD − 400mV, VOL ≤ 400mV) - interfaces directly with 1.8V/3.3V logic without pull-ups. |
| Common-Mode Range | VSS to VDD − 1.1V - accommodates ground-referenced sensors and high-side current monitors. |
Pinout & Package
The MAX9021AUK+T is housed in a RoHS-compliant 5-pin SOT23-5 package (U5+1), with 1.3mm × 2.9mm footprint and 1.0mm height - compatible with standard SOT23 pick-and-place tooling and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Inverting input - accepts reference or inverted signal path; supports common-mode down to VSS. |
| 2 | IN+ | Noninverting input - connects to sensor output or threshold source; same common-mode range as IN−. |
| 3 | OUT | Push-pull rail-to-rail output - drives CMOS loads directly; sinks/supplies up to 4mA while maintaining logic-level swing. |
| 4 | VSS | Negative supply / ground - must be connected to system ground or negative rail; bypassing not required at pin but recommended externally. |
| 5 | VDD | Positive supply - requires 0.1μF ceramic bypass capacitor to VSS near the pin for stable high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Enables direct interface with 1.8V, 2.5V, and 3.3V logic families without level shifters or pull-up resistors. |
| No phase reversal | Guarantees correct output polarity even when inputs exceed common-mode range - critical for overvoltage-tolerant sensor front-ends. |
| Fixed 4mV hysteresis | Eliminates need for external positive feedback network, reducing BOM count and PCB area in space-constrained designs. |
| −40°C to +125°C operation | Qualified for automotive cabin and industrial ambient environments without derating or thermal management. |
| Low 2.8μA supply current | Permits continuous monitoring in energy-harvesting nodes where average power budget is <1μW. |
Applications
| Battery-Powered Portable Systems | Sensor-Signal Detection |
|---|---|
Use Scenario: Always-on voltage monitoring in wearable health monitors using coin-cell batteries. IC Role / Device Role / Timing Role: Threshold detector comparing battery voltage against low-battery cutoff level. Use Value: 2.8μA quiescent current extends operational lifetime beyond 5 years on CR2032 cell. | Use Scenario: Detecting motion-triggered IR sensor output in smart home occupancy detectors. IC Role / Device Role / Timing Role: Comparator converting analog pyroelectric signal into clean digital interrupt. Use Value: Built-in 4mV hysteresis prevents chatter during slow-rising thermal transients. |
| Photodiode Preamps | Digital Line Receivers |
Use Scenario: Converting low-current photodiode output into TTL-compatible pulse train in optical smoke detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier output stage comparator with fast 3μs response. Use Value: Rail-to-rail output ensures full logic swing into MCU GPIO, eliminating external buffer stages. | Use Scenario: Recovering digital data from attenuated RS-232 or UART signals in noisy factory environments. IC Role / Device Role / Timing Role: High-noise-margin line receiver discriminating between logic high/low thresholds. Use Value: Input common-mode range to VDD − 1.1V supports reception of signals referenced to local ground under supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDBVR | Lower supply current (350nA), slower propagation delay (12μs), no internal hysteresis. | Better for nano-power wake-up triggers; unsuitable for >10kHz signal detection without external hysteresis. | Select TLV3691IDBVR only when sub-μA current dominates timing requirements. |
| MAX9060AXK+T | Higher speed (1.5μs), higher supply current (12μA), same 4mV hysteresis and SOT23-5 package. | Preferred for high-frequency digital line receivers requiring faster edge response. | Choose MAX9060AXK+T when propagation delay <2μs is mandatory and 4× current penalty is acceptable. |
Compared with TLV3691IDBVR and MAX9060AXK+T, the MAX9021AUK+T uniquely balances ultra-low power (2.8μA), moderate speed (3μs), and integrated hysteresis in SOT23-5 - making it optimal for cost-sensitive, battery-operated threshold detection where both longevity and noise immunity are required.
Availability
The MAX9021AUK+T is available at Aetrix Electronics and suitable for battery-powered portable systems, sensor-signal detection, and photodiode preamp applications requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX9021AUK+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX9021AUK+T belongs to the MAX90xx micropower comparator family, designed specifically for ultra-low-power, single-supply threshold detection in space-constrained portable and sensor-edge applications.
FAQ
What is the operating temperature range specified for the MAX9021AUK+T?
The MAX9021AUK+T is rated for continuous operation from −40°C to +125°C, fully qualified for automotive cabin and industrial control environments. This range is guaranteed by design and verified across all electrical parameters including supply current, propagation delay, and input offset voltage - ensuring reliability without derating in harsh thermal conditions. The MAX9021AUK+T maintains its 2.8μA supply current and 3μs propagation delay across this full span.
Does the MAX9021AUK+T require external hysteresis components for stable operation?
No, the MAX9021AUK+T includes 4mV of internal hysteresis, which is factory-trimmed and temperature-stable. This eliminates the need for external positive-feedback resistors in most noise-prone applications such as sensor interfacing or slow-moving input signals. External hysteresis can still be added if wider thresholds are required, but the MAX9021AUK+T functions reliably out-of-the-box with its built-in hysteresis.
What package type is used for the MAX9021AUK+T, and is it compatible with standard SOT23 assembly processes?
The MAX9021AUK+T uses a 5-pin SOT23-5 package (package code U5+1), measuring 1.3mm × 2.9mm with 1.0mm height. It is fully compatible with industry-standard SOT23 pick-and-place equipment, stencil printing, and reflow soldering profiles. Pin 1 is marked with a dot, and the pinout matches JEDEC MO-178AB - enabling drop-in replacement for other SOT23-5 comparators in existing layouts.
Can the MAX9021AUK+T operate from a 1.8V supply?
No, the MAX9021AUK+T has a minimum specified supply voltage of 2.5V. Operation below 2.5V is outside its guaranteed specification and may result in degraded propagation delay, reduced output swing, or failure to switch. For 1.8V systems, consider alternatives like the TLV3691 or MAX9060 series - but note that the MAX9021AUK+T is not characterized or warranted for use at 1.8V.
What is the maximum capacitive load the MAX9021AUK+T output can drive without instability?
The MAX9021AUK+T output is stable with capacitive loads up to 150pF, as confirmed by characterization across temperature and supply voltage. Driving loads exceeding 150pF may cause overshoot, ringing, or delayed transitions due to increased output stage phase lag. For larger loads (e.g., long PCB traces or multiple gate inputs), a series resistor (10–100Ω) should be added close to the output pin to isolate capacitance and preserve 3μs propagation performance. The MAX9021AUK+T does not include internal compensation for heavy capacitive loading.
MAX9021AUK+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:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 5.5V, ±1.25V ~ 2.75V
- :
- 1mV @ 5V
- Voltage - Input Offset (Max):
- 0.003µA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 5µA
- Current - Quiescent (Max):
- 100dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 8µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
MAX9021AUK+T FAQ
1.How can I place an order for MAX9021AUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9021AUK+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 MAX9021AUK+T reliable?
The price and inventory of MAX9021AUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9021AUK+T is usually 5 days.
3.What payment methods are accepted for MAX9021AUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9021AUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9021AUK+T?
MAX9021AUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9021AUK+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 MAX9021AUK+T?
For technical support, including MAX9021AUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9021AUK+T requirements.
6.How does Aetrix verify that MAX9021AUK+T is sourced from the original manufacturer or authorized distributors?
All MAX9021AUK+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 MAX9021AUK+T meets industry standards.
7.What is the process for return or replacement of MAX9021AUK+T?
All MAX9021AUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9021AUK+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 MAX9021AUK+T part is unused and in its original packaging.
Return procedure for MAX9021AUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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