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Analog Devices Inc./Maxim Integrated MAX9021AXK-T
- Part No.:
- MAX9021AXK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX9021AXK-T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,832
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Product details
Overview
The MAX9021AXK-T from Analog Devices is a micropower single comparator optimized for battery-powered portable systems, featuring 2.8μA supply current, 3μs propagation delay, and 4mV internal hysteresis - enabling robust threshold detection in photodiode preamps and keyless entry sensors operating from 2.5V to 5.5V single supply.
For engineers reviewing the MAX9021AXK-T datasheet, MAX9021AXK-T pinout, MAX9021AXK-T application, or MAX9021AXK-T equivalent, this device is selected for ultra-low-power, rail-to-rail output, wide common-mode input range (VSS to VDD − 1.1V), and guaranteed operation across −40°C to +125°C - critical for automotive-grade sensor interfaces and space-constrained IoT endpoints.
Technical Context
The MAX9021AXK-T implements a CMOS input stage with rail-to-rail output swing and no phase reversal under overdriven inputs, supporting clean switching even with slow-moving signals. Its internal 4mV hysteresis eliminates oscillation without external feedback components.
Designed for single-supply operation down to 2.5V, it maintains stable performance across the full −40°C to +125°C automotive temperature range while consuming only 2.8μA per comparator - making it suitable for always-on wake-up circuits and low-duty-cycle sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V single supply - enables direct integration with Li-ion, coin-cell, and 3.3V/5V system rails. |
| Supply Current | 2.8μA typical - supports >10-year battery life in continuous monitoring applications at 3V. |
| Propagation Delay | 3μs at VOD = 100mV - sufficient for kHz-level signal discrimination in sensor wake-up logic. |
| Hysteresis | 4mV built-in - provides noise immunity against EMI and PCB coupling without external resistors. |
| Input Common-Mode Range | VSS to VDD − 1.1V - allows direct interfacing with ground-referenced sensors and DAC outputs. |
| Output Swing | Rail-to-rail - ensures full logic-level compatibility with 1.8V–5V microcontrollers and FPGAs. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial edge nodes. |
Pinout & Package
The MAX9021AXK-T is housed in a 5-pin SC70 package (package code X5+1), measuring 2.0mm × 1.25mm × 0.9mm - half the footprint of SOT23 - with wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VSS | Negative supply reference | Must be connected to system ground or negative rail; serves as return path for input bias and output sink current. |
| 2 - OUT | Comparator output | Rail-to-rail CMOS output capable of sourcing/sinking ≥10μA; compatible with high-impedance logic inputs. |
| 3 - IN− | Inverting input | Differential input node with ±8mV offset and 3nA max bias current; accepts signals up to VDD − 1.1V. |
| 4 - IN+ | Noninverting input | Differential input node matching IN− specs; used for threshold comparison against reference or sensor signal. |
| 5 - VDD | Positive supply | Requires local 0.1μF ceramic bypass capacitor to VSS; supports 2.5V–5.5V operation with 80dB PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on overdrive | Prevents false triggering when input exceeds common-mode range - essential for unconditioned sensor inputs. |
| Ultra-low quiescent current | 2.8μA enables multi-year operation on CR2032 coin cells in intermittent-sensing applications. |
| Internal 4mV hysteresis | Eliminates need for external positive-feedback resistors - reduces BOM count and layout area in compact designs. |
| Rail-to-rail output | Delivers full logic-high/low swing across entire supply range - simplifies interface with mixed-voltage digital subsystems. |
| Wide input common-mode range | VSS to VDD − 1.1V allows direct connection to grounded thermistors, photodiodes, or DAC outputs without level-shifting. |
Applications
| Battery-Powered Portable Systems | Sensor-Signal Detection |
|---|---|
Use Scenario: Always-on voltage monitoring in handheld medical devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Threshold detector comparing battery voltage against 3.0V cutoff level to trigger low-battery warning. Use Value: 2.8μA supply current extends usable battery life by >30% versus comparable comparators, while 4mV hysteresis prevents chatter near trip point. | Use Scenario: Motion-triggered wake-up in smart building occupancy sensors using passive infrared (PIR) elements. IC Role / Device Role / Timing Role: Amplified PIR signal conditioning stage detecting amplitude excursions above ambient noise floor. Use Value: Input common-mode range extending to VSS enables direct AC-coupled PIR output interface without DC biasing circuitry. |
| Photodiode Preamps | Keyless Entry Systems |
Use Scenario: Low-light optical detection in wearable pulse oximeters using transimpedance-amplifier (TIA) output stages. IC Role / Device Role / Timing Role: Fast-response comparator converting analog TIA output into clean digital pulses for pulse-rate calculation. Use Value: 3μs propagation delay ensures accurate timing resolution for sub-100ms cardiac events, while rail-to-rail output drives MCU GPIO directly. | Use Scenario: RF receiver baseband signal validation in automotive key fob receivers detecting valid Manchester-encoded commands. IC Role / Device Role / Timing Role: Digital line receiver discriminating valid logic transitions from antenna-coupled noise bursts. Use Value: Internal hysteresis rejects RF-induced glitches without external filtering, reducing component count in cost-sensitive remote modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDCKR | Lower supply current (350nA), but slower propagation delay (12μs); 1.8V–5.5V supply range. | Better for nanowatt sleep modes; unsuitable for >1kHz signal discrimination due to latency. | Select TLV3691IDCKR only when ultra-low power dominates speed requirements. |
| MAX9060AXK+T | Same SC70-5 package, 1.6μA supply current, 12μs delay, 10mV hysteresis; −40°C to +125°C rated. | Superior noise immunity for high-EMI environments; trade-off is reduced response bandwidth. | Choose MAX9060AXK+T where EMI resilience outweighs timing precision in industrial sensors. |
Compared with TLV3691IDCKR and MAX9060AXK+T, the MAX9021AXK-T uniquely balances 3μs speed, 2.8μA consumption, and 4mV hysteresis in SC70 - making it optimal for portable systems requiring both responsiveness and multi-year battery life.
Availability
MAX9021AXK-T is available at Aetrix Electronics and suitable for battery-powered portable systems, sensor-signal detection, and photodiode preamps requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX9021AXK-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 MAX9021AXK-T belongs to the MAX90xx micropower comparator family, engineered specifically for ultra-low-power, single-supply threshold detection in space-constrained, battery-operated endpoints.
FAQ
What is the maximum capacitive load the MAX9021AXK-T output can drive without oscillation?
The MAX9021AXK-T output is stable with up to 150pF capacitive load, as verified in the datasheet's "Maximum Capacitive Load" specification. Exceeding this value may cause sustained oscillations or increased propagation delay. For loads >150pF, add a series resistor (e.g., 50Ω) close to the output pin to isolate capacitance - a technique confirmed effective in typical application circuits for the MAX9021AXK-T.
Does the MAX9021AXK-T support dual-supply operation?
Yes, the MAX9021AXK-T supports dual-supply operation from ±1.25V to ±2.75V, as specified in the Detailed Description section. However, its primary design focus is single-supply use from 2.5V to 5.5V - dual-supply mode is supported but not optimized for rail-splitting or bipolar signal handling in the MAX9021AXK-T.
Can the MAX9021AXK-T operate reliably at 2.5V supply voltage?
Yes, the MAX9021AXK-T is fully specified and guaranteed to operate at 2.5V supply voltage across the full −40°C to +125°C range, with all key parameters - including 2.8μA supply current, 3μs propagation delay, and 4mV hysteresis - maintained per the Electrical Characteristics table. This makes the MAX9021AXK-T suitable for direct connection to single-cell Li-ion or alkaline battery systems.
Is the MAX9021AXK-T RoHS-compliant and lead-free?
Yes, the MAX9021AXK-T carries the "+" suffix indicating a lead(Pb)-free/RoHS-compliant package, as explicitly stated in the Ordering Information table. The SC70-5 package (X5+1) meets EU RoHS Directive 2011/65/EU and JEDEC JS-001 standards, with full compliance documentation available from Analog Devices' product change notifications for the MAX9021AXK-T.
What is the input offset voltage specification for the MAX9021AXK-T over temperature?
The MAX9021AXK-T has a guaranteed input offset voltage of ±8mV over the full −40°C to +125°C range, with a typical value of ±1mV at +25°C and a temperature coefficient of ±1µV/°C. These values are measured and tested per Note 2 in the Electrical Characteristics table, ensuring predictable trip-point stability in automotive and industrial thermal environments for the MAX9021AXK-T.
MAX9021AXK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
- :
- SC-70-5
MAX9021AXK-T FAQ
1.How can I place an order for MAX9021AXK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9021AXK-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 MAX9021AXK-T reliable?
The price and inventory of MAX9021AXK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9021AXK-T is usually 5 days.
3.What payment methods are accepted for MAX9021AXK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9021AXK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9021AXK-T?
MAX9021AXK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9021AXK-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 MAX9021AXK-T?
For technical support, including MAX9021AXK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9021AXK-T requirements.
6.How does Aetrix verify that MAX9021AXK-T is sourced from the original manufacturer or authorized distributors?
All MAX9021AXK-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 MAX9021AXK-T meets industry standards.
7.What is the process for return or replacement of MAX9021AXK-T?
All MAX9021AXK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9021AXK-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 MAX9021AXK-T part is unused and in its original packaging.
Return procedure for MAX9021AXK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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