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Analog Devices Inc. ADT6503SRJZN035RL7
- Part No.:
- ADT6503SRJZN035RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADT6503SRJZN035RL7.pdf
- Description:
- 2.7V TO 5.5V, MICROPOWER TEMPERA
- Quantity:
- Payment:
- Shipping:
Inventory:5,112
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Product details
Overview
ADT6503SRJZN035RL7 from Analog Devices is a factory-trimmed, open-drain, active-low temperature switch in 5-lead SOT-23 package with −35°C trip point, ±6°C accuracy at threshold, 2.7 V to 5.5 V supply range, and pin-selectable 2°C/10°C hysteresis-used for cold-temperature fault detection in microprocessor reset circuits.
For engineers reviewing the ADT6503SRJZN035RL7 datasheet, ADT6503SRJZN035RL7 pinout, ADT6503SRJZN035RL7 application, or ADT6503SRJZN035RL7 equivalent, key selection factors include its cold-threshold behavior (output activates when temperature falls below −35°C), open-drain output requiring external pull-up, dual hysteresis configuration via HYST pin, and operation across −55°C to +125°C ambient range.
Technical Context
The ADT6503SRJZN035RL7 implements a Σ-Δ temperature-to-digital converter with 11-bit resolution and 0.125°C quantization step, digitizing on-chip bandgap sensor voltage for precise local thermal monitoring. Its comparator compares the digitized value against a factory-programmed −35°C threshold and asserts TUNDER low when temperature drops below that point.
Operation relies on internal 600 ms conversion cycle with 30 ms conversion time per sample; analog circuitry powers down between conversions to maintain 30 µA typical supply current. Hysteresis selection (2°C or 10°C) is controlled by logic level on HYST pin-GND for 2°C, VCC for 10°C-and prevents output oscillation near trip point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Temperature | −35°C factory-set; output activates when die temperature falls below this point. |
| Threshold Accuracy | ±6°C at −35°C; maximum deviation confirmed over operating range. |
| Supply Voltage Range | 2.7 V to 5.5 V; compatible with 3.3 V and 5 V logic rails without level shifting. |
| Supply Current | 30 µA typical; enables micropower system-level thermal monitoring. |
| Hysteresis Options | 2°C (HYST = GND) or 10°C (HYST = VCC); prevents chatter during slow thermal transitions. |
| Output Type | Open-drain, active-low TUNDER; requires external pull-up resistor for logic interface. |
| Operating Temp Range | −55°C to +125°C ambient; supports industrial and automotive under-hood environments. |
Pinout & Package
ADT6503SRJZN035RL7 is housed in a RoHS-compliant 5-lead SOT-23 (RJ-5) package with standard footprint and thermal characteristics (θJA = 240°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | GND | Dual ground terminals; primary thermal and electrical return path-critical for minimizing self-heating error and ensuring accurate local sensing. |
| 3 | HYST | Hysteresis select input; logic low (GND) configures 2°C hysteresis, logic high (VCC) selects 10°C-must not float. |
| 4 | VCC | Power supply input; accepts 2.7 V–5.5 V; requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin. |
| 5 | TUNDER | Open-drain, active-low output; sinks current when temperature falls below −35°C; requires external pull-up to define logic-high level. |
Key Features
| Feature | Design Value |
|---|---|
| Σ-Δ temperature conversion | Delivers 11-bit resolution (0.125°C step) and inherent noise immunity without external filtering components. |
| Cold-threshold switching | Factory-configured for sub-zero activation (−35°C), enabling early warning of freezing conditions or cold-start failures. |
| No external components required | Operates standalone with only VCC decoupling capacitor-reduces BOM count and PCB area in space-constrained designs. |
| Pin-selectable hysteresis | Eliminates need for external resistors or firmware tuning-hardware-based stability control directly on board. |
| Low self-heating impact | 99 µW typical dissipation at 3.3 V yields <0.024°C thermal error in free air-preserves measurement fidelity in precision applications. |
Applications
| Microprocessor Cold Reset | Automotive Cabin Sensor |
|---|---|
Use Scenario: Monitors CPU board temperature during cold boot to prevent operation below safe silicon limits. IC Role / Device Role / Timing Role: Cold-threshold temperature switch asserting reset signal when die temperature drops below −35°C. Use Value: Prevents latch-up or timing violation in microprocessors exposed to sub-zero storage or startup environments. | Use Scenario: Detects freezing cabin air temperature in HVAC control modules for defrost activation. IC Role / Device Role / Timing Role: Local temperature monitor triggering heater engagement before condensation forms on windows. Use Value: Enables fail-safe response to ambient cold without software polling or ADC overhead. |
| Hard Disk Drive Low-Temp Lockout | Medical Diagnostic Equipment Storage Monitor |
Use Scenario: Disables HDD spin-up in cold warehouse environments where lubricant viscosity increases risk of head crash. IC Role / Device Role / Timing Role: Standalone cold alarm interfacing with drive controller's enable line via open-drain TUNDER output. Use Value: Eliminates mechanical failure mode by enforcing minimum operating temperature before actuation. | Use Scenario: Ensures MRI or ultrasound equipment remains within validated storage temperature range (−40°C to +10°C) during transport. IC Role / Device Role / Timing Role: Passive thermal sentinel logging cold excursions using open-drain output tied to supervisory microcontroller interrupt. Use Value: Provides audit-ready cold-chain compliance evidence without battery or active logging circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar cold-threshold temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT6503SRJZN045RL7 | Factory-trimmed to −45°C trip point; identical package, pinout, and hysteresis options. | Activates at lower temperature-suitable for extended cold-range monitoring where −35°C is insufficient margin. | Select when system must respond earlier to deep-cold exposure; no layout or firmware changes required. |
| LM75BIMM/NOPB | I²C digital temperature sensor with programmable thresholds; no factory-trimmed switch output; requires host MCU interaction. | Enables adjustable trip points and temperature readback-but adds firmware complexity and bus dependency. | Choose when flexibility and telemetry outweigh simplicity; not drop-in for reset-driven applications. |
Compared with ADT6503SRJZN035RL7, ADT6503SRJZN045RL7 offers tighter cold protection at −45°C with identical hardware integration, while LM75BIMM/NOPB trades autonomous switching for configurability and digital interface-requiring system-level redesign.
Availability
ADT6503SRJZN035RL7 is available at Aetrix Electronics and suitable for microprocessor reset, automotive HVAC, hard disk drive thermal lockout, and medical cold-chain monitoring requiring stable component supply across industrial temperature grades.
Supply support for ADT6503SRJZN035RL7 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The ADT650x series was designed specifically for autonomous, low-power thermal supervision in space-constrained systems-emphasizing factory accuracy, minimal external components, and robust operation from −55°C to +125°C.
FAQ
What is the exact trip temperature of ADT6503SRJZN035RL7 and how is it calibrated?
ADT6503SRJZN035RL7 has a factory-programmed trip temperature of −35°C, verified across production lots with ±6°C maximum accuracy at that threshold. Calibration is performed during wafer sort using precision thermal chambers and laser trimming of internal reference circuitry-no user calibration is required or supported.
Does ADT6503SRJZN035RL7 require an external pull-up resistor on its output pin?
Yes, ADT6503SRJZN035RL7 features an open-drain TUNDER output that must be pulled up to a logic-compatible voltage (e.g., 3.3 V or 5 V) via an external resistor. Typical values range from 4.7 kΩ to 10 kΩ depending on rise time and bus loading requirements.
How does the HYST pin affect the behavior of ADT6503SRJZN035RL7?
The HYST pin on ADT6503SRJZN035RL7 selects hysteresis magnitude: connecting to GND sets 2°C hysteresis, while connecting to VCC selects 10°C. This determines the temperature delta required to deactivate the output after activation-preventing oscillation near the −35°C trip point.
Can ADT6503SRJZN035RL7 operate reliably at −55°C ambient temperature?
Yes, ADT6503SRJZN035RL7 is fully specified from −55°C to +125°C ambient. Its internal bandgap sensor and Σ-Δ converter maintain functionality and accuracy across this full range, with trip behavior preserved even at extreme cold endpoints.
Is ADT6503SRJZN035RL7 pin-compatible with other devices in the ADT650x family?
Yes, ADT6503SRJZN035RL7 shares identical 5-lead SOT-23 (RJ-5) pinout and footprint with all ADT6501/ADT6502/ADT6503/ADT6504 variants-including same GND, HYST, VCC, and output pin assignments-enabling direct substitution within the same functional group (cold-threshold models).
ADT6503SRJZN035RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADT6503
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Cold
- Switching Temperature:
- 35°C
- Accuracy:
- ±6°C
- Current - Output (Max):
- 20mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /UnderTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Hysteresis, Selectable Trip Point
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 30µA
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
ADT6503SRJZN035RL7 FAQ
1.How can I place an order for ADT6503SRJZN035RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADT6503SRJZN035RL7 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 ADT6503SRJZN035RL7 reliable?
The price and inventory of ADT6503SRJZN035RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADT6503SRJZN035RL7 is usually 5 days.
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Once your ADT6503SRJZN035RL7 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 ADT6503SRJZN035RL7?
For technical support, including ADT6503SRJZN035RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADT6503SRJZN035RL7 requirements.
6.How does Aetrix verify that ADT6503SRJZN035RL7 is sourced from the original manufacturer or authorized distributors?
All ADT6503SRJZN035RL7 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 ADT6503SRJZN035RL7 meets industry standards.
7.What is the process for return or replacement of ADT6503SRJZN035RL7?
All ADT6503SRJZN035RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADT6503SRJZN035RL7, 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 ADT6503SRJZN035RL7 part is unused and in its original packaging.
Return procedure for ADT6503SRJZN035RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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