My Inquiry
My Account
Analog Devices Inc. AD7418AR
- Part No.:
- AD7418AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7418AR.pdf
- Description:
- IC ADC 4CH W/TEMP SENSOR 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:13,104
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7418AR from Analog Devices is a 10-bit single-channel analog-to-digital converter with integrated temperature sensor, I²C interface, and on-chip 2.5 V reference-designed for ambient temperature monitoring and single-point voltage sensing in space-constrained industrial and embedded systems. It delivers ±1°C accuracy at 25°C, 30 μs temperature conversion time, and operates from 2.7 V to 5.5 V.
For engineers reviewing the AD7418AR datasheet, AD7418AR pinout, AD7418AR application, or AD7418AR equivalent, this page provides verified technical context, real-world use cases, pin-level design meaning, and validated alternative options for thermal-aware signal acquisition.
Technical Context
The AD7418AR integrates a successive approximation ADC, 5-channel multiplexer (with Channel 0 dedicated to the on-die temperature sensor), track-and-hold amplifier, internal clock oscillator, and programmable overtemperature indicator (OTI). Its conversion sequence is triggered either by CONVST pulse or automatically after I²C read/write operations.
Temperature measurement is performed by selecting Channel 0; the resulting 10-bit code corresponds to ambient temperature with 0.25°C/LSB resolution. The OTI output is open-drain, configurable as comparator or interrupt mode, and driven by a fault-queue counter to suppress noise-induced false triggers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - Provides 1024 discrete steps across full-scale range for precise thermal and analog voltage digitization. |
| Temp Accuracy | ±1°C at 25°C, ±2°C over −40°C to +125°C - Enables reliable ambient monitoring without external calibration. |
| Conversion Time | 30 μs for temperature (Channel 0), 15 μs for analog input - Supports high-throughput thermal polling in real-time control loops. |
| Supply Range | 2.7 V to 5.5 V - Compatible with both 3.3 V and 5 V system rails without level-shifting. |
| I²C Address | 7-bit address with A0/A1/A2 pins - Allows up to 8 AD7418AR devices on one bus for multi-zone thermal mapping. |
| Power Consumption | 600 μA typical active, 1.5 μA shutdown - Enables battery-powered or low-power always-on thermal supervision. |
| Reference | Internal 2.5 V ±25 mV - Eliminates need for external reference unless higher precision is required. |
Pinout & Package
AD7418AR is housed in an 8-lead SOIC package (width: 3.9 mm) compliant with JEDEC MS-012, suitable for automated assembly and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SDA | I²C bidirectional data line | Push-pull output supports standard/fast-mode I²C; requires external pull-up for bus arbitration and multi-device operation. |
| 2 SCL | I²C clock input | Controls timing of serial transfers; rising edge samples data, falling edge drives data-no external clock needed for conversion. |
| 3 OTI | Open-drain overtemperature indicator | Asserts low when temperature exceeds TOTI register value; reset occurs automatically after I²C read-enables hardware interrupt signaling. |
| 4 GND | Analog/digital ground reference | Common return for track-and-hold, comparator, DAC, and digital logic-must be low-impedance and separated from noisy power grounds. |
| 5 AIN | Single-ended analog input channel | Accepts 0 V to VREF (2.5 V) signals; selected via configuration register as Channel 4-supports external voltage sensing alongside temperature. |
| 6 REFIN | Reference input / enable | Tie to GND to activate internal 2.5 V reference; connect external 2.5 V source (with 10 µF bypass) to override-disables internal reference automatically. |
| 7 VDD | Positive supply | 2.7 V–5.5 V operation; decoupling with 0.1 µF ceramic capacitor near pin is mandatory for ADC stability and noise immunity. |
| 8 CONVST | Convert start control | Rising edge powers up device (4 µs wake-up); falling edge >4 µs initiates conversion-enables synchronous sampling in deterministic systems. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip temperature sensor | Measures ambient die temperature from −40°C to +125°C with ±1°C accuracy at 25°C-eliminates external sensor BOM and layout complexity. |
| Programmable OTI output | Configurable as active-low comparator or interrupt with fault queue (1–16 hits) to prevent spurious triggering in electrically noisy environments. |
| Auto power-down | Enters ultra-low-power state (<1.5 µA) automatically after conversion-reduces average current in periodic thermal polling applications. |
| Internal 2.5 V reference | 80 ppm/°C tempco, ±25 mV error-provides stable scaling for both temperature and analog measurements without external components. |
| I²C-compatible interface | Supports standard (100 kHz) and fast (400 kHz) modes; A0/A1/A2 address pins allow daisy-chaining up to eight devices on one bus. |
Applications
| Industrial Process Monitoring | Embedded System Thermal Management |
|---|---|
|
Use Scenario: Real-time monitoring of motor drive enclosure temperature and rail voltage in PLC modules. IC Role / Device Role / Timing Role: AD7418AR performs concurrent temperature sensing (Channel 0) and analog voltage acquisition (Channel 4) with 30 μs/15 μs conversions-feeding feedback to safety watchdog logic. Use Value: Single-chip solution replaces discrete thermistor + ADC, reducing component count and PCB area while maintaining ±1°C thermal fidelity. |
Use Scenario: Fan speed control and CPU throttling in network appliance based on local board temperature. IC Role / Device Role / Timing Role: AD7418AR's OTI pin directly drives fan controller enable input; temperature readings updated every 100 ms via I²C polling. Use Value: Hardware OTI interrupt enables immediate fan activation before thermal shutdown-no software latency in critical overtemp events. |
| Battery-Powered Environmental Logger | Automotive Cabin Climate Control |
|
Use Scenario: Long-life data logger recording ambient temperature and battery voltage in remote sensor nodes. IC Role / Device Role / Timing Role: AD7418AR operates in auto power-down mode between 1-second I²C reads-drawing only ~0.15 μW during sleep. Use Value: 1.5 μA shutdown current extends coin-cell life beyond 5 years; integrated reference avoids drift-prone external components. |
Use Scenario: Local temperature sensing at HVAC actuator locations in automotive cabin control units. IC Role / Device Role / Timing Role: AD7418AR interfaces to microcontroller via I²C with A0/A1/A2 set to unique address-enabling multiple sensors per CAN gateway node. Use Value: −40°C to +125°C operating range meets AEC-Q200 ambient requirements; SOIC package withstands automotive reflow profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature-sensing ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7410ARMZ | 16-bit resolution, ±0.25°C accuracy, no analog input channel, SPI/I²C dual interface | Higher precision thermal-only monitoring; lacks voltage sensing capability of AD7418AR | Select when absolute temperature accuracy >0.5°C is required and analog input is unnecessary. |
| LM75BIMM/NOPB | 9-bit temperature sensor only, no ADC, no OTI programmability, fixed 7-bit I²C address | Basic thermal alerting only; no voltage measurement, no fault queue, no user-configurable thresholds | Select for cost-sensitive, single-threshold overtemp detection where ADC functionality is not needed. |
Compared with AD7418AR, ADT7410ARMZ offers superior thermal resolution but omits analog input and requires higher system precision budgeting; LM75BIMM/NOPB reduces feature set and flexibility to achieve lower unit cost in simple thermal cutoff roles.
Availability
AD7418AR is available at Aetrix Electronics and suitable for industrial process monitoring, embedded thermal management, and battery-powered environmental logging requiring stable component supply and long-term lifecycle support.
Supply support for AD7418AR 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 since 1965.
The AD7418AR belongs to Analog Devices' precision temperature-sensing ADC family, engineered to integrate thermal awareness and analog measurement into compact, low-power embedded subsystems without external support components.
FAQ
What is the operating temperature range of the AD7418AR?
The AD7418AR operates across −40°C to +125°C ambient temperature. Its on-chip temperature sensor maintains ±1°C accuracy at 25°C and ±2°C accuracy over the full range. This specification applies to the A-version device, which matches the AD7418AR ordering option and ensures reliability in harsh industrial and automotive under-hood environments.
Does the AD7418AR require an external reference voltage?
No, the AD7418AR includes an internal 2.5 V reference with ±25 mV accuracy and 80 ppm/°C temperature coefficient. To use it, tie the REFIN pin to GND. An external 2.5 V reference may be applied to REFIN only if higher precision is required-doing so disables the internal reference automatically.
How does the OTI (Overtemperature Indicator) pin function on the AD7418AR?
The OTI pin on the AD7418AR is an open-drain output that asserts low when the measured temperature exceeds the value stored in the TOTI setpoint register. It resets automatically after any I²C read operation. Configuration registers allow selection of comparator vs. interrupt mode and fault queue depth (1–16 consecutive out-of-limit readings) to prevent false triggers.
Can the AD7418AR measure external voltages in addition to temperature?
Yes, the AD7418AR includes one single-ended analog input channel (AIN) usable as Channel 4. It accepts 0 V to VREF (2.5 V) signals and converts them in 15 μs. This allows concurrent monitoring of ambient temperature (via Channel 0) and a system parameter like supply voltage or sensor output-all within one 8-pin SOIC package.
What package type is used for the AD7418AR?
The AD7418AR is supplied in an 8-lead SOIC package (JEDEC MS-012, body width 3.9 mm). This surface-mount package supports standard reflow soldering, automated placement, and is pin-compatible with other members of the AD7416/AD7417/AD7418 family-including the AD7416AR and AD7417AR in same-outline variants.
AD7418AR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 10 b
- Features:
- Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- 25°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
AD7418AR FAQ
1.How can I place an order for AD7418AR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7418AR 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 AD7418AR reliable?
The price and inventory of AD7418AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7418AR is usually 5 days.
3.What payment methods are accepted for AD7418AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7418AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7418AR?
AD7418AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7418AR 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 AD7418AR?
For technical support, including AD7418AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7418AR requirements.
6.How does Aetrix verify that AD7418AR is sourced from the original manufacturer or authorized distributors?
All AD7418AR 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 AD7418AR meets industry standards.
7.What is the process for return or replacement of AD7418AR?
All AD7418AR units undergo pre-shipment inspection (PSI). If there is an issue with AD7418AR, 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 AD7418AR part is unused and in its original packaging.
Return procedure for AD7418AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7418AR Tags
-
MCP9700T-E/TT
Microchip Technology
-
MCP9700T-E/LT
Microchip Technology
-
MCP9701T-E/TT
Microchip Technology
-
MCP9701T-E/LT
Microchip Technology
-
TMP235A4DBZR
Texas Instruments
-
MCP9700AT-E/TT
Microchip Technology
-
MCP9700AT-E/LT
Microchip Technology
-
MCP9701AT-E/LT
Microchip Technology
-
MCP9701AT-E/TT
Microchip Technology
,TO-226_straightlead.jpg)
-
LM335Z
STMicroelectronics
-
TMP1075NDRLR
Texas Instruments
-
TMP1075DGKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
