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Analog Devices Inc./Maxim Integrated MAX918ESA+
- Part No.:
- MAX918ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX918ESA+.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:348
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Product details
Overview
MAX918ESA+ from Maxim Integrated is a nanopower, open-drain comparator with integrated 1.245V ±1.5% reference, guaranteed to operate from +1.8V to +5.5V supply, featuring Beyond-the-Rails™ input range (VEE − 0.2V to VCC + 0.2V), 750nA typical supply current, and 4mV internal hysteresis - designed for ultra-low-power 2-cell battery monitoring and threshold detection in space-constrained systems.
For engineers reviewing the MAX918ESA+ datasheet, MAX918ESA+ pinout, MAX918ESA+ application, or MAX918ESA+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated SO-8 package terminal roles, confirmed alternative comparators with documented functional trade-offs, and supply-chain support tailored for battery-powered embedded designs.
Technical Context
The MAX918ESA+ implements a rail-to-rail input stage with 200mV beyond-the-rails common-mode range and an open-drain output stage rated for absolute maximum 6V at the output relative to VEE - enabling mixed-voltage logic interfacing and wire-OR configurations. Its internal 1.245V reference exhibits 95ppm/°C temperature coefficient and supports ≤10nA load current with <0.2mV/nA load regulation.
Switching behavior is stabilized by 4mV internal hysteresis and crowbar-current-free output architecture, eliminating supply glitches during transitions. Propagation delay is 95µs (low-to-high) and 120µs (high-to-low) at VCC = 5V with 100mV overdrive and 15pF load - performance maintained across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V - enables direct operation from single Li-ion or dual alkaline cells without regulation. |
| Supply Current | 750nA typical - extends battery life to multi-year operation in always-on sensing nodes. |
| Reference Voltage | 1.245V ±1.5% - provides stable, factory-trimmed threshold for precision low-voltage monitoring. |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - allows sensing at ground or supply rail without level-shifting. |
| Output Type | Open-drain - supports flexible pull-up to higher or lower voltage domains (up to 6V absolute). |
| Propagation Delay | 95µs (tPD+) / 120µs (tPD−) at VCC = 5V - balances speed and ultra-low power for slow-varying signals like battery voltage decay. |
| Hysteresis | 4mV internal - prevents chatter on noisy or slowly ramping inputs without external components. |
Pinout & Package
MAX918ESA+ is housed in an 8-pin SO (Small Outline) package (Package Code S8+2), RoHS-compliant, with standard JEDEC MS-012AC outline and thermal pad not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected; must be left floating or tied to GND per layout best practice. |
| 2 | VEE | Negative supply pin - referenced to system ground; supports true ground-sensing applications. |
| 3 | IN− (REF) | Inverting input and reference output - dual-function pin delivering 1.245V reference and accepting feedback or fixed threshold. |
| 4 | IN+ | Noninverting input - accepts sensed signal (e.g., battery voltage divider) for comparison against REF or external threshold. |
| 5 | N.C. | No Connection - internally unconnected; no routing required. |
| 6 | OUT | Open-drain output - requires external pull-up; enables logic-level translation and wired-AND bus topologies. |
| 7 | VCC | Positive supply pin - powers internal circuitry and reference; decoupling capacitor recommended near pin. |
| 8 | N.C. | No Connection - internally unconnected; no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Input Stage | Accepts inputs 200mV below VEE or above VCC - eliminates need for external biasing in rail-to-rail sensor interfaces. |
| Integrated Precision Reference | 1.245V ±1.5% with 95ppm/°C TC - replaces discrete reference ICs and reduces BOM count in battery monitor circuits. |
| Crowbar-Current-Free Switching | Negligible supply current surge during output transition - minimizes supply noise and eliminates need for large bulk capacitors. |
| Internal 4mV Hysteresis | Guaranteed clean switching without external feedback - simplifies design for noisy environments like motor control or EMI-prone enclosures. |
| Open-Drain Output with 6V Absolute Max | Supports level translation between 1.8V, 3.3V, and 5V domains - enables interoperability in mixed-voltage IoT sensor hubs. |
Applications
| 2-Cell Battery Monitoring | Ultra-Low-Power Threshold Detection |
|---|---|
Use Scenario: Continuous monitoring of dual AA/AAA alkaline cell voltage to trigger low-battery warning before cutoff at 2.4V. IC Role / Device Role / Timing Role: Comparator compares scaled battery voltage against internal 1.245V reference to generate digital alert signal. Use Value: 750nA quiescent current enables >2.5 million hours of operation on 2000mAh cells - eliminating frequent battery replacement. |
Use Scenario: Detecting temperature threshold crossing in wearable health sensors using thermistor divider network. IC Role / Device Role / Timing Role: Compares thermistor voltage against internal reference to assert interrupt on MCU when body temperature exceeds 38°C. Use Value: Beyond-the-Rails™ input allows direct connection to thermistor grounded at system GND - no level-shifter or bias resistor needed. |
| Logic-Level Translation | Telemetry Signal Conditioning |
Use Scenario: Converting 5V UART TX signal to 3.3V-compatible level for Bluetooth module input in portable diagnostic device. IC Role / Device Role / Timing Role: Open-drain output pulled to 3.3V rail generates clean 0–3.3V logic swing synchronized to 5V source. Use Value: Eliminates risk of overvoltage damage to 3.3V receiver while maintaining signal integrity up to 115.2kbps. |
Use Scenario: Converting analog pressure sensor output (0–100mV) into digital pulse train for wireless transmission in remote industrial gauge. IC Role / Device Role / Timing Role: Comparator with internal hysteresis converts slow-rising sensor voltage into jitter-free digital edge for microcontroller capture. Use Value: 4mV hysteresis rejects EMI-induced noise on long sensor cables - preventing false triggers in electrically noisy factory floors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDBVR | Single 1.8V–5.5V comparator with 320nA supply current, no internal reference, push-pull output. | Lacks integrated reference; requires external voltage source for threshold setting - increases component count in battery monitors. | Preferred when lowest possible current (320nA) is critical and reference can be supplied externally or derived from system rail. |
| MAX40002ANSR | Single 1.6V–5.5V comparator with 900nA supply current, 1.2V reference, open-drain output, and 1.5µs propagation delay. | Higher speed but 20% higher supply current; reference tolerance ±2% vs. ±1.5% - trades precision for response time. | Chosen when faster wake-up (<2µs) is required for event-driven sensing, and ±2% reference accuracy is acceptable. |
Compared with TLV3691IDBVR and MAX40002ANSR, the MAX918ESA+ uniquely combines ultra-low 750nA current, tight ±1.5% reference accuracy, and open-drain flexibility - making it optimal for precision, long-life battery monitoring where reference integration and noise immunity are prioritized over raw speed.
Availability
MAX918ESA+ is available at Aetrix Electronics and suitable for 2-cell battery monitoring, ultra-low-power threshold detection, and mixed-voltage logic translation requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for MAX918ESA+ 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 demanding applications.
The MAX917–MAX920 family was engineered specifically for nanopower, rail-aware sensing in battery-constrained systems - delivering precision reference, ultra-low IQ, and robust input/output architecture in minimal footprint.
FAQ
What is the function of Pin 3 (IN−/REF) on the MAX918ESA+?
Pin 3 serves a dual role: it functions as both the inverting input (IN−) and the output of the internal 1.245V reference. When used as a reference, it supplies a precision voltage for threshold comparison; when used as IN−, it accepts feedback or a fixed reference voltage. The MAX918ESA+ datasheet specifies that this pin must not be loaded beyond ±10nA to maintain reference accuracy within ±1.5%.
Does the MAX918ESA+ require external hysteresis for reliable operation?
No - the MAX918ESA+ includes 4mV of internal hysteresis, which ensures clean, chatter-free switching even with slow-moving or noisy input signals. This eliminates the need for external positive-feedback resistors in most applications, including battery voltage monitoring and temperature threshold detection. The MAX918ESA+ specification confirms hysteresis is guaranteed across −40°C to +85°C.
Can the MAX918ESA+ output drive a 10kΩ pull-up resistor to 5V while powered from 3.3V?
Yes - the MAX918ESA+ open-drain output supports absolute maximum 6V at the OUT pin relative to VEE, independent of VCC. When powered from 3.3V, it can safely sink current from a 5V pull-up, enabling robust level translation. The MAX918ESA+ datasheet confirms VO(max) = 6V and specifies leakage current <1µA at 5.5V, ensuring compatibility.
How does the MAX918ESA+ achieve ultra-low supply current during switching?
The MAX918ESA+ uses a crowbar-current-free output stage architecture that avoids simultaneous conduction in pull-up/pull-down paths. This design limits supply current surges during transitions - keeping total ICC within 750nA typical across all dynamic conditions. The MAX918ESA+ Typical Operating Characteristics show <10% increase in supply current even at 1kHz output toggle frequency.
Is the MAX918ESA+ compatible with lead-free reflow soldering processes?
Yes - the MAX918ESA+ carries the "+" suffix, indicating RoHS-compliant, lead-free packaging. It is qualified for standard Pb-free reflow profiles with peak temperature up to +260°C (per JEDEC J-STD-020), and its SO-8 package (S8+2) meets IPC/JEDEC moisture sensitivity level 1 requirements - no pre-bake needed prior to assembly.
MAX918ESA+ 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:
- Tube
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- Open-Drain
- 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):
- 120µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX918ESA+ FAQ
1.How can I place an order for MAX918ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX918ESA+ 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 MAX918ESA+ reliable?
The price and inventory of MAX918ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX918ESA+ is usually 5 days.
3.What payment methods are accepted for MAX918ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX918ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX918ESA+?
MAX918ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX918ESA+ 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 MAX918ESA+?
For technical support, including MAX918ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX918ESA+ requirements.
6.How does Aetrix verify that MAX918ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX918ESA+ 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 MAX918ESA+ meets industry standards.
7.What is the process for return or replacement of MAX918ESA+?
All MAX918ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX918ESA+, 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 MAX918ESA+ part is unused and in its original packaging.
Return procedure for MAX918ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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