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Analog Devices Inc./Maxim Integrated MAX917ESA-T
- Part No.:
- MAX917ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX917ESA-T.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,263
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Product details
Overview
MAX917ESA-T from Maxim Integrated is a nanopower, rail-to-rail input comparator with integrated 1.245V ±1.5% reference, push-pull output, and guaranteed operation down to +1.8V supply. It draws only 750nA supply current, supports input voltages extending 200mV beyond the rails (VEE − 0.2V to VCC + 0.2V), and delivers ±8mA output drive-making it ideal for 2-cell battery monitoring in portable medical instruments and ultra-low-power telemetry systems.
For engineers reviewing the MAX917ESA-T datasheet, MAX917ESA-T pinout, MAX917ESA-T application, or MAX917ESA-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain support tailored for OEM and embedded design programs.
Technical Context
The MAX917ESA-T implements a Beyond-the-Rails™ input stage using ESD-protected PNP-based differential pairs, enabling operation with common-mode inputs from VEE − 0.2V to VCC + 0.2V. Its internal 1.245V reference is derived from a 120nA current source driving a PNP emitter-follower, delivering ±1.5% accuracy over −40°C to +85°C with 95ppm/°C TC.
The comparator features a crowbar-current-free break-before-make push-pull output stage that limits supply-current surges during switching-reducing dynamic power consumption and eliminating typical supply glitches. Internal 4mV hysteresis ensures clean transitions even with slow-moving or noisy input signals, and no phase reversal occurs under overdriven input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 750nA typical at +25°C - enables >2.5 million hours of operation on a single AA alkaline cell (2.4V end-of-life) |
| Supply Voltage Range | +1.8V to +5.5V - supports direct interface with 2-cell NiMH/Li-ion batteries without regulation |
| Input Offset Voltage | 1mV typical, 5mV max - ensures accurate threshold detection in low-voltage sensing applications |
| Reference Voltage | 1.245V ±1.5% - stable, factory-trimmed reference eliminates need for external precision voltage source |
| Output Drive Capability | ±8mA rail-to-rail swing - directly drives LEDs, logic inputs, or small MOSFET gates without buffering |
| Propagation Delay | 30µs typical (low-to-high), 95µs typical (high-to-low) at VCC = 5V - balances speed and ultra-low power for battery-critical timing |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - enables ground-referenced or supply-line sensing without level-shifting circuitry |
Pinout & Package
MAX917ESA-T is housed in an 8-pin SO (Small Outline) package (Package Code S8+2), RoHS-compliant, with 1.27mm lead pitch and standard JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No Connection (N.C.) | Unbonded die pads; must be left floating or tied to GND per layout best practice-no electrical function |
| 2 | VCC | Positive supply input (1.8V–5.5V); bypass with 100nF capacitor if supply impedance exceeds 1Ω |
| 3 | IN− / REF | Comparator inverting input AND internal 1.245V reference output - dual-function pin requiring careful routing separation |
| 4 | IN+ | Comparator noninverting input; accepts signals up to VCC + 0.2V, enabling high-side sensing above supply rail |
| 6 | OUT | CMOS push-pull output; sinks and sources up to ±8mA with rail-to-rail swing - compatible with 1.8V/3.3V/5V logic families |
| 7 | VEE | Negative supply (typically GND); serves as reference for internal reference and output swing - must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 750nA supply current | Extends battery life in 2-cell systems by >10× versus standard comparators; enables multi-year operation in remote sensors |
| Beyond-the-Rails™ input range | Supports direct sensing at ground or supply line without external resistive dividers or level shifters - reduces BOM and layout area |
| Integrated 1.245V ±1.5% reference | Eliminates external reference IC or resistor divider; maintains accuracy across −40°C to +85°C with <95ppm/°C drift |
| Crowbar-current-free switching | Minimizes supply transients during output transitions - removes need for large bulk decoupling capacitors in space-constrained designs |
| Internal 4mV hysteresis | Prevents oscillation on slow or noisy inputs (e.g., thermistor outputs); avoids external hysteresis resistors in most threshold-detection use cases |
Applications
| 2-Cell Battery Monitoring | Ultra-Low-Power Telemetry |
|---|---|
Use Scenario: Real-time voltage tracking of two-series NiMH cells in portable diagnostic equipment. IC Role / Device Role / Timing Role: Comparator compares cell voltage against internal 1.245V reference to trigger low-battery alert when either cell drops below 1.2V. Use Value: 750nA quiescent current extends operational lifetime beyond 2.5 years on AA-sized cells; Beyond-the-Rails™ input allows direct connection to cell stack without level-shifting. |
Use Scenario: Wake-up trigger for wireless sensor nodes measuring environmental parameters in remote field deployments. IC Role / Device Role / Timing Role: Threshold detector monitors analog sensor output (e.g., humidity transducer) and asserts interrupt signal when crossing preset limit. Use Value: Push-pull output directly drives MCU wake-up pin; internal hysteresis prevents false triggers from sensor noise; 1.8V operation matches energy-harvesting PMIC output. |
| Medical Instrument Sensing | Threshold Discriminator in PDAs |
Use Scenario: Precision zero-crossing detection for ECG front-end signal conditioning in handheld patient monitors. IC Role / Device Role / Timing Role: MAX917ESA-T configured as zero-crossing detector (IN− = GND, IN+ = AC-coupled signal) generates clean digital edge on each waveform crossing. Use Value: No phase reversal under overdrive ensures reliable edge timing; 4mV hysteresis rejects EMI-induced jitter; rail-to-rail output interfaces directly with 1.8V ADC controller. |
Use Scenario: Adaptive backlight control based on ambient light sensor output in legacy PDA designs. IC Role / Device Role / Timing Role: Comparator compares photodiode amplifier output against programmable threshold set via DAC reference, triggering PWM dimming logic. Use Value: 1.245V reference provides stable, temperature-invariant threshold anchor; 8mA output drive directly switches logic-level MOSFET controlling LED current path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX918ESA+ | Same 8-pin SO package and 750nA supply current, but open-drain output and identical 1.245V reference - requires external pullup resistor. | Suitable for wired-OR bus configurations or mixed-voltage logic translation (e.g., 5V device driving 3V MCU input), not direct replacement for push-pull loads. | Select MAX918ESA+ only when open-drain functionality is required; MAX917ESA-T remains optimal for direct logic interfacing or driving capacitive loads. |
| TLV3691IDBVR | Lower 320nA supply current and 1.8V operation, but no integrated reference; input range limited to VEE to VCC (no Beyond-the-Rails™). | Better for ultra-long-life applications where external reference exists or rail-constrained sensing suffices; unsuitable for ground- or supply-line sensing without level shift. | Choose TLV3691IDBVR when minimizing current dominates over input flexibility and reference integration; MAX917ESA-T preferred when system-level simplification is critical. |
Compared with MAX918ESA+, MAX917ESA-T offers immediate push-pull compatibility with logic and loads, while TLV3691IDBVR trades reference integration and input range for lower current-making MAX917ESA-T the optimal choice when design simplicity, sensing flexibility, and proven battery life are prioritized.
Availability
MAX917ESA-T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, ultra-low-power telemetry, and medical instrument sensing requiring stable component supply across extended production lifecycles.
Supply support for MAX917ESA-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 communications applications.
The MAX917–MAX920 family was designed specifically for nanopower, battery-critical systems requiring precision threshold detection with minimal external components-targeting portable instrumentation, remote sensing, and energy-harvesting endpoints.
FAQ
What is the operating temperature range for MAX917ESA-T?
The MAX917ESA-T is fully specified and guaranteed over the industrial temperature range of −40°C to +85°C. All electrical characteristics-including supply current, reference voltage accuracy, input offset, and propagation delay-are validated across this full range per Maxim's datasheet revision 2 (October 2010). This makes MAX917ESA-T suitable for deployment in outdoor telemetry units and portable medical devices exposed to ambient thermal extremes.
Does MAX917ESA-T require external bypass capacitors?
MAX917ESA-T does not strictly require external bypass capacitors due to its crowbar-current-free output architecture and ultra-low dynamic current surges. However, a 100nF ceramic capacitor placed close to the VCC and VEE pins is recommended when supply impedance exceeds 1Ω, supply leads are long, or high-frequency noise is present-per Maxim's Board Layout and Bypassing guidance in the datasheet. This ensures stable reference and output performance in noisy environments.
Can MAX917ESA-T sense signals below ground or above VCC?
Yes. The MAX917ESA-T features Beyond-the-Rails™ inputs with a common-mode range extending 200mV beyond the supply rails: from VEE − 0.2V to VCC + 0.2V. This allows direct sensing of ground-referenced signals (e.g., current-sense shunt at system ground) or supply-line voltages (e.g., VCC monitoring) without external level-shifting circuitry-confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for MAX917/MAX918.
How is the internal reference used in MAX917ESA-T?
In MAX917ESA-T, the internal 1.245V ±1.5% reference is accessed at Pin 3 (IN−/REF) and serves dual roles: as the comparator's inverting input and as a buffered voltage source. It is stable for any capacitive load, has ~200kΩ output impedance, and can be bypassed with a low-leakage capacitor. For driving heavier loads, Maxim recommends buffering with a low-input-leakage op amp like the MAX406-details are provided in the Reference section of the datasheet.
Is MAX917ESA-T pin-compatible with other devices in the MAX917–MAX920 family?
No. MAX917ESA-T uses an 8-pin SO package with N.C. pins at positions 1, 5, and 8, while MAX917EUK+T uses a 5-pin SOT23 package with different pinout and terminal count. Within the SO package variants, MAX917ESA+, MAX918ESA+, MAX919ESA+, and MAX920ESA+ share identical 8-pin SO footprints and pin assignments-but differ electrically (e.g., push-pull vs. open-drain, reference presence). MAX917ESA-T is functionally and physically compatible only with MAX917ESA+.
MAX917ESA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- Beyond-the-Rails™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 1.8V ~ 5.5V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 0.001µA @ 5V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 1.6µA
- Current - Quiescent (Max):
- 80dB PSRR
- CMRR, PSRR (Typ):
- 95µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX917ESA-T FAQ
1.How can I place an order for MAX917ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX917ESA-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 MAX917ESA-T reliable?
The price and inventory of MAX917ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX917ESA-T is usually 5 days.
3.What payment methods are accepted for MAX917ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX917ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX917ESA-T?
MAX917ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX917ESA-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 MAX917ESA-T?
For technical support, including MAX917ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX917ESA-T requirements.
6.How does Aetrix verify that MAX917ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX917ESA-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 MAX917ESA-T meets industry standards.
7.What is the process for return or replacement of MAX917ESA-T?
All MAX917ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX917ESA-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 MAX917ESA-T part is unused and in its original packaging.
Return procedure for MAX917ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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