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Analog Devices Inc./Maxim Integrated MAX921ESA-TG068
- Part No.:
- MAX921ESA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX921ESA-TG068.pdf
- Description:
- DUAL-SUPPLY COMPARATOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
MAX921ESA-TG068 from Maxim Integrated is a single-channel, micropower comparator with integrated 1.182V ±1% bandgap reference, programmable hysteresis via HYST pin, and TTL/CMOS-compatible output capable of sourcing up to 40mA. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), features input common-mode range from V− to (V+ − 1.3V), and draws ≤4µA quiescent current over −40°C to +85°C. It is used in battery-powered threshold detection where ultra-low power and rail-to-rail input capability are critical.
For engineers reviewing the MAX921ESA-TG068 datasheet, MAX921ESA-TG068 pinout, MAX921ESA-TG068 application, or MAX921ESA-TG068 equivalent, key selection considerations include its guaranteed 4µA max supply current at extended temperature, internal reference accuracy, HYST-pin hysteresis programming method, and output stage's crowbar-free switching behavior for stable operation in noisy layouts.
Technical Context
The MAX921ESA-TG068 implements a single comparator core with an on-chip 1.182V bandgap reference referenced to V−, not GND. Its unique output stage eliminates crowbar current during transitions, minimizing supply-line parasitic feedback and enabling stable operation without strict PCB layout constraints.
It supports hysteresis configuration via the HYST pin using two external resistors (REF→HYST→V−), delivering up to 100mV hysteresis band. Input voltage range extends from V− to (V+ − 1.3V), and output swings from V+ to GND - confirming its single-supply TTL compatibility when V− = GND and V+ = +5V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; enables direct use with 3V/5V systems and industrial rails |
| Quiescent Current | ≤4µA over −40°C to +85°C; ensures multi-year battery life in always-on sensing nodes |
| Reference Voltage | 1.182V ±1% (0°C to +70°C); provides stable, factory-trimmed threshold anchor without external components |
| Input Common-Mode Range | V− to (V+ − 1.3V); supports detection near positive rail, e.g., monitoring 4.7V supply with 5V V+ |
| Output Source Current | ≥40mA continuous; drives LEDs, small relays, or logic inputs directly without buffer stages |
| Propagation Delay | 12µs typical (10mV overdrive); balances speed and ultra-low power for non-critical timing applications |
| Hysteresis Control | Programmable via HYST pin (REF − 50mV to REF); enables precise noise margin tuning with two resistors only |
Pinout & Package
MAX921ESA-TG068 is housed in an 8-pin SO package (SOIC-8, 150mil width), RoHS-compliant, with standard JEDEC MS-012AC footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; tied to V− in single-supply mode; defines output low level at 0V |
| 2 | V− | Negative supply; connect to GND for single-supply operation; reference point for REF and input common-mode range |
| 3 | IN+ | Noninverting input; accepts signals from V− to (V+ − 1.3V); high-impedance (±5nA leakage) |
| 4 | IN− | Inverting input; identical electrical specs to IN+; used for threshold comparison against IN+ |
| 5 | HYST | Hysteresis control input; voltage set between REF − 50mV and REF to define hysteresis band width |
| 6 | REF | 1.182V reference output (vs. V−); sources/sinks µA-level current; must not be bypassed |
| 7 | V+ | Positive supply; supports up to +11V; powers comparator core and output driver |
| 8 | OUT | Push-pull output; sinks and sources current; swings rail-to-rail (V+ to GND) with no crowbar current |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA max over full −40°C to +85°C range - enables decade-scale coin-cell operation |
| Integrated precision reference | 1.182V ±1% over 0°C to +70°C - eliminates external reference IC and reduces BOM count |
| Crowbar-free output stage | No shoot-through current during logic transitions - prevents supply glitches and layout-induced instability |
| Single-pin hysteresis programming | HYST pin accepts analog voltage (REF − 50mV to REF) - enables precise, resistor-based hysteresis without feedback networks |
| Rail-to-rail input range | V− to (V+ − 1.3V) - supports high-side sensing and wide dynamic range signal monitoring |
Applications
| Battery-Powered Threshold Detector | Window Comparator Subsystem |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage to trigger low-battery warning at 3.2V and disable charging above 4.3V. IC Role / Device Role / Timing Role: Single MAX921ESA-TG068 compares cell voltage against reference-derived thresholds; HYST pin sets 50mV hysteresis to prevent chatter near trip points. Use Value: 4µA supply current extends system standby time; integrated REF eliminates calibration drift vs. resistor-divider-only solutions. |
Use Scenario: Power-good supervision in portable medical device requiring valid 5V ±5% supply before enabling MCU. IC Role / Device Role / Timing Role: MAX921ESA-TG068 configured as upper/lower comparator (using external resistive dividers) generates undervoltage/overvoltage flags. Use Value: Programmable HYST pin ensures clean, chatter-free flag transitions despite supply ripple; 12µs delay allows safe sequencing. |
| Oscillator Circuit (Relaxation) | LED Bar-Graph Driver |
Use Scenario: Building low-power triangle-wave oscillator for sensor biasing in environmental data logger. IC Role / Device Role / Timing Role: MAX921ESA-TG068 functions as Schmitt trigger with RC network; HYST pin sets hysteresis to define frequency-determining thresholds. Use Value: Internal REF provides stable trip points independent of supply variation; 40mA source current drives timing capacitor directly. |
Use Scenario: Four-level battery charge indicator using discrete LEDs on handheld instrument. IC Role / Device Role / Timing Role: MAX921ESA-TG068 output drives LED anode through current-limiting resistor; IN+ receives scaled battery voltage; REF sets reference. Use Value: 40mA output capability eliminates external transistor drivers; ultra-low IQ prevents significant loading of weak battery sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3701IDBVR | Lower supply current (1.6µA typ), no internal reference, open-drain output only | Requires external reference and pull-up; unsuitable for direct LED driving or rail-to-rail output needs | Select when lowest possible IQ is primary and output drive/current sourcing is not required |
| LMV7235M5X | Higher supply current (32µA typ), no internal reference, push-pull output, 45ns propagation delay | Needs external reference; faster but consumes >8× more current; better for high-speed zero-crossing detection | Select when nanosecond response is critical and power budget allows >30µA quiescent draw |
Compared with TLV3701IDBVR and LMV7235M5X, the MAX921ESA-TG068 uniquely combines sub-4µA operation, integrated ±1% reference, and 40mA push-pull output - making it optimal for self-contained, battery-sensitive threshold detection where component count and layout simplicity matter.
Availability
MAX921ESA-TG068 is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and oscillator circuits requiring stable component supply across industrial temperature ranges.
Supply support for MAX921ESA-TG068 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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, emphasizing low-power innovation and high-reliability performance.
The MAX921ESA-TG068 belongs to the MAX921–MAX924 family of ultra-low-power comparators engineered specifically for energy-constrained systems like portable instrumentation, remote sensors, and always-on monitoring devices.
FAQ
What is the operating temperature range for MAX921ESA-TG068?
The MAX921ESA-TG068 is rated for −40°C to +85°C (Extended temperature range). This is confirmed by the "ESA" suffix in the part number and validated in the Absolute Maximum Ratings and Electrical Characteristics tables, where all C/E/M-range parameters are explicitly specified across this span.
Does MAX921ESA-TG068 include an internal voltage reference?
Yes, the MAX921ESA-TG068 integrates a precision 1.182V ±1% bandgap voltage reference referenced to V−. This is documented in the Features list, Electrical Characteristics (Reference Voltage section), and Typical Operating Circuit - eliminating need for external reference components in threshold applications.
Can MAX921ESA-TG068 operate from a 3V single supply?
Yes, MAX921ESA-TG068 supports single-supply operation from +2.5V to +11V. At 3V, its supply current remains ≤10.5µA (typical), input common-mode range extends from V− to (V+ − 1.3V) = 1.7V, and output maintains rail-to-rail swing - fully validated in the 3V OPERATION Electrical Characteristics table.
How is hysteresis programmed on MAX921ESA-TG068?
Hysteresis is programmed via the HYST pin: connect R1 from REF to HYST, and R2 from HYST to V−. The voltage at HYST (REF − 50mV to REF) sets hysteresis band width - up to 100mV - as detailed in Figure 3 and Applications Information section of the datasheet for MAX921ESA-TG068.
What is the maximum continuous output source current of MAX921ESA-TG068?
The MAX921ESA-TG068 delivers ≥40mA continuous output source current, verified in the Features list ("40mA Continuous Source Current"), Electrical Characteristics ("Source Current" row), and Detailed Description section - enabling direct drive of LEDs, small solenoids, or logic inputs without external buffers.
MAX921ESA-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
MAX921ESA-TG068 FAQ
1.How can I place an order for MAX921ESA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX921ESA-TG068 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 MAX921ESA-TG068 reliable?
The price and inventory of MAX921ESA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX921ESA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX921ESA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX921ESA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX921ESA-TG068?
MAX921ESA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX921ESA-TG068 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 MAX921ESA-TG068?
For technical support, including MAX921ESA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX921ESA-TG068 requirements.
6.How does Aetrix verify that MAX921ESA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX921ESA-TG068 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 MAX921ESA-TG068 meets industry standards.
7.What is the process for return or replacement of MAX921ESA-TG068?
All MAX921ESA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX921ESA-TG068, 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 MAX921ESA-TG068 part is unused and in its original packaging.
Return procedure for MAX921ESA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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