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Analog Devices Inc. ADT14GP
- Part No.:
- ADT14GP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
ADT14GP.pdf
- Description:
- QUAD SETPOINT TEMP. MONITOR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADT14GP from Analog Devices is a quad setpoint, programmable temperature monitor and controller IC featuring four independent open-collector outputs, ±3°C accuracy over –40°C to +125°C, 5 mV/K VPTAT output scale factor, and user-programmable thermal hysteresis (0.65°C/1.5°C/5°C). It operates from a single 4.5 V to 5.5 V supply and delivers stable thermal trip control in power supply monitoring and multi-fan systems.
For engineers reviewing the ADT14GP datasheet, ADT14GP pinout, ADT14GP application, or ADT14GP equivalent, this page provides verified functional identity, validated 16-pin DIP package mapping, confirmed comparator-based architecture with internal 2.5 V reference and VPTAT sensor, and real-world thermal control use cases requiring discrete setpoint programming and hysteresis tuning.
Technical Context
The ADT14GP integrates a bandgap voltage reference generating both a stable 2.5 V output and a precision VPTAT signal (5 mV/K, 1.49 V at +25°C), feeding four matched comparators whose noninverting inputs share the VPTAT node. Each comparator compares VPTAT against externally resistor-programmed setpoint voltages applied to SET1–SET4 pins.
Hysteresis is controlled via the HYS pin (Pin 11), which programs an internal current mirror to generate an offset voltage across a 1 kΩ internal resistor - enabling reset only after VPTAT falls below the setpoint by the programmed hysteresis delta. All four open-collector outputs sink up to 5 mA and are TTL/CMOS-compatible with external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Accuracy | ±3°C over –40°C to +125°C - guarantees trip point repeatability across industrial operating range without calibration. |
| VPTAT Scale Factor | +5.0 mV/K (±0.1 mV/K) - enables direct Kelvin-to-voltage conversion for precise setpoint resistor calculation. |
| Reference Voltage | 2.50 V ±10 mV at +25°C, ±20 mV over –40°C to +125°C - provides stable voltage source for accurate resistor ladder programming. |
| Supply Current | ≤600 µA at +5 V - ensures minimal self-heating and low system power overhead in always-on thermal monitoring. |
| Open-Collector Sink | 5 mA per output at VOL ≤0.6 V - supports direct interfacing to logic-level inputs or base/gate drive of external switching transistors. |
| Hysteresis Options | 0.65°C (HYS to VREF), 1.5°C (HYS open), or 5°C (HYS to GND) - allows noise-immune trip reset without external components. |
| Operating Supply | 4.5 V to 5.5 V - compatible with standard +5 V logic rails and eliminates need for auxiliary regulators. |
Pinout & Package
The ADT14GP is housed in a 16-lead plastic DIP (N-16) package with 0.3-inch width, through-hole mounting, and industry-standard pin spacing. Thermal resistance is θJA = 103°C/W, suitable for moderate-power PCB layouts without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTPUT 1 | Open-collector output for Setpoint 1 trip - sinks 5 mA when VPTAT exceeds SET1 voltage. |
| 2 | V+ | Positive supply input - accepts 4.5 V to 5.5 V; bypassing with 0.1 µF capacitor to GND required. |
| 3 | 2.5V REFERENCE | Stable 2.5 V reference output - used to generate all four setpoint voltages via resistor ladders. |
| 4 | SETPOINT 4 | Comparator input for highest temperature trip - voltage equals (T4 + 273.15) × 5 mV/K. |
| 5 | OUTPUT 4 | Open-collector output for Setpoint 4 trip - active-low, requires external pull-up. |
| 6 | SETPOINT 1 | Comparator input for first programmed trip - voltage equals (T1 + 273.15) × 5 mV/K. |
| 7 | NC | No connect - internally unconnected; must remain floating or grounded per layout best practice. |
| 8 | NC | No connect - internally unconnected; must remain floating or grounded. |
| 9 | SETPOINT 3 | Comparator input for third trip point - voltage equals (T3 + 273.15) × 5 mV/K. |
| 10 | HYSTERESIS | Hysteresis programming input - sets comparator reset threshold via voltage-controlled current mirror. |
| 11 | NC | No connect - not assigned; leave unconnected. |
| 12 | GND | Analog ground reference - common return for V+, VREF, VPTAT, and all setpoint dividers. |
| 13 | VPTAT | Proportional-to-absolute-temperature output - 1.49 V at +25°C, +5 mV/K slope, low-impedance source. |
| 14 | SETPOINT 2 | Comparator input for second trip point - voltage equals (T2 + 273.15) × 5 mV/K. |
| 15 | OUTPUT 2 | Open-collector output for Setpoint 2 trip - active-low, TTL/CMOS compatible. |
| 16 | OUTPUT 3 | Open-collector output for Setpoint 3 trip - active-low, identical electrical specs to OUTPUT 1–4. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent temperature setpoints | Enables simultaneous monitoring of multiple thermal zones (e.g., CPU, GPU, VRM, heatsink) with one IC. |
| Resistor-programmable trip points | Eliminates need for DACs or microcontrollers - setpoints defined by simple external resistor ladders tied to 2.5 V reference. |
| User-selectable hysteresis levels | Prevents output chatter near trip thresholds using three pin-strapped options (0.65°C/1.5°C/5°C) or fine-tuned resistive dividers. |
| Integrated 2.5 V reference + VPTAT sensor | Provides both precision voltage reference and calibrated temperature-sensing element on-die - no external sensor or reference needed. |
| 5 mA open-collector outputs | Directly drives transistor bases, optocoupler LEDs, or logic inputs - avoids level-shifting circuitry in fan control or shutdown paths. |
Applications
| Power Supply Thermal Shutdown | Multi-Fan Speed Control |
|---|---|
Use Scenario: Monitors heatsink temperature in high-efficiency DC-DC converters and disables output if thermal limit is exceeded. IC Role / Device Role / Timing Role: Temperature sensor and trip-point controller - compares VPTAT against resistor-defined thresholds to assert shutdown signals. Use Value: Prevents MOSFET or inductor thermal runaway without software intervention; leverages ±3°C accuracy to avoid premature shutdown. |
Use Scenario: Controls four cooling fans in server chassis based on localized temperature zones (CPU, memory, storage, PSU). IC Role / Device Role / Timing Role: Quad comparator-based thermal sequencer - each OUTPUT drives fan enable line via NPN transistor or optocoupler. Use Value: Enables staged fan activation (e.g., low speed at 60°C, full speed at 85°C) using only passive components and no firmware. |
| Workstation CPU/GPU Throttling | Industrial Motor Drive Overtemperature Protection |
Use Scenario: Detects CPU and GPU die temperatures in embedded workstations and triggers throttling or alarm signals before thermal throttling occurs. IC Role / Device Role / Timing Role: Dual-zone thermal monitor - SET1/SET2 configured for CPU, SET3/SET4 for GPU; outputs feed FPGA or CPLD interrupt lines. Use Value: Provides hardware-level early warning with <100 ms response time (per thermal time constant data), independent of OS or BIOS. |
Use Scenario: Protects IGBT gate drivers and motor windings in variable-frequency drives by monitoring heatsink temperature near power modules. IC Role / Device Role / Timing Role: Safety-critical thermal cutoff - OUTPUT 4 asserts hard shutdown signal to disable PWM generation when >105°C is detected. Use Value: Meets IEC 61800-5-1 thermal protection requirements using analog-only path - no MCU dependency or firmware latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad temperature setpoint applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM57CIMX-5/NOPB | Single setpoint with digital I²C interface; ±2.5°C accuracy; includes internal ADC and register-based hysteresis. | Requires microcontroller host; supports dynamic setpoint updates but lacks four independent outputs. | Choose for systems needing programmable setpoints via firmware rather than fixed resistor ladders. |
| MAX6581ASA+T | Quad setpoint with SMBus interface; ±3°C accuracy; integrated 2.5 V reference; 12-bit VPTAT ADC output. | Delivers digitized temperature readings and status flags over bus; no open-collector outputs - uses push-pull alarms. | Choose when centralized thermal telemetry and remote configuration outweigh need for direct hardware trip outputs. |
Compared with LM57CIMX-5/NOPB and MAX6581ASA+T, the ADT14GP offers true hardware-decoupled, resistor-programmed trip control with four dedicated open-collector outputs - eliminating microcontroller dependency, bus contention, and conversion latency in safety-critical or deterministic thermal management.
Availability
ADT14GP is available at Aetrix Electronics and suitable for power supply thermal shutdown, multi-fan speed control, and workstation CPU/GPU throttling requiring stable component supply and long-term industrial availability.
Supply support for ADT14GP 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, communications, automotive, and consumer markets since 1965.
The ADT14GP belongs to Analog Devices' precision temperature sensing and thermal management product line, designed specifically for analog-intensive, microcontroller-free thermal control in power electronics and computing infrastructure.
FAQ
What is the primary function of the ADT14GP?
The ADT14GP is a quad setpoint, programmable temperature monitor and controller IC that generates a voltage proportional to absolute temperature (VPTAT) and compares it against four user-defined trip thresholds. When any threshold is exceeded, the corresponding open-collector output activates. Its core function is hardware-based, resistor-programmed thermal trip control without software or digital interfaces - making it ideal for deterministic, fail-safe thermal management in the ADT14GP.
How do I calculate resistor values for a specific temperature setpoint on the ADT14GP?
To set a temperature T (°C), calculate the required setpoint voltage as VSET = (T + 273.15) × 5 mV/K. Then use the ADT14GP's internal 2.5 V reference and a resistor ladder to generate that voltage at the corresponding SET pin (e.g., SET1). For example, for T = 75°C: VSET1 = 348.15 K × 5 mV/K = 1.74075 V. The ADT14GP datasheet provides ladder design equations and examples - all calculations rely on the confirmed 5 mV/K scale factor and 2.5 V reference of the ADT14GP.
Can the ADT14GP drive a relay or MOSFET directly?
The ADT14GP's open-collector outputs sink up to 5 mA with VOL ≤ 0.6 V at full load - sufficient to drive small-signal NPN transistors, optocoupler LEDs, or logic inputs, but not relays or power MOSFET gates directly. Driving such loads requires external buffering (e.g., a 2N2222 or MMBT2907) to prevent self-heating (>0.97°C error in SOIC) and ensure reliable switching. This limitation is inherent to the ADT14GP's 5 mA output rating and must be addressed in layout.
What is the role of the HYSTERESIS pin (Pin 11) on the ADT14GP?
The HYSTERESIS pin (Pin 11) on the ADT14GP programs the temperature delta below the trip point at which the comparator resets - preventing oscillation near thresholds. Connecting Pin 11 to VREF yields 0.65°C hysteresis; leaving it open gives 1.5°C; tying it to GND gives 5°C. Intermediate values (0.65–5°C) are achieved with resistive dividers. This feature is integral to stable operation of the ADT14GP in noisy thermal environments.
Is the ADT14GP still in production or obsolete?
The ADT14GP is marked "OBSOLETE" in the provided documentation, indicating Analog Devices has discontinued its manufacture. However, Aetrix Electronics maintains legacy inventory and offers extended supply support including traceable sourcing, cross-reference assistance, and lifecycle coordination - ensuring continued access to the ADT14GP for existing designs and maintenance programs.
ADT14GP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±3°C
- Topology:
- Comparator, Voltage Reference
- Output Type:
- Open Drain
- Output Alarm:
- No
- Output Fan:
- Yes
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
ADT14GP FAQ
1.How can I place an order for ADT14GP through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT14GP 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 ADT14GP reliable?
The price and inventory of ADT14GP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT14GP is usually 5 days.
3.What payment methods are accepted for ADT14GP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADT14GP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADT14GP?
ADT14GP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADT14GP 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 ADT14GP?
For technical support, including ADT14GP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT14GP requirements.
6.How does Aetrix verify that ADT14GP is sourced from the original manufacturer or authorized distributors?
All ADT14GP 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 ADT14GP meets industry standards.
7.What is the process for return or replacement of ADT14GP?
All ADT14GP units undergo pre-shipment inspection (PSI). If there is an issue with ADT14GP, 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 ADT14GP part is unused and in its original packaging.
Return procedure for ADT14GP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADT14GP Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
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MCP98244T-BE/MNY
Microchip Technology
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TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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