My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6503UKN045
- Part No.:
- MAX6503UKN045
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6503UKN045.pdf
- Description:
- MICROPOWER TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:443
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6503UKN045 from Maxim Integrated is a cold-temperature threshold, open-drain, micropower temperature switch with factory-trimmed trip point of -45°C, ±0.5°C typical accuracy, 30µA supply current, and pin-selectable 2°C/10°C hysteresis. It interfaces directly with µP reset inputs in thermal monitoring circuits for industrial controllers and embedded systems requiring fail-safe low-power overtemperature protection.
For engineers reviewing the MAX6503UKN045 datasheet, MAX6503UKN045 pinout, MAX6503UKN045 application, or MAX6503UKN045 equivalent, this device delivers precise cold-temperature assertion (TUNDER), operates from +2.7V to +5.5V, requires no external components, and supports thermal window alarms when paired with hot-threshold counterparts like MAX6502UKP075.
Technical Context
The MAX6503UKN045 uses dual on-chip temperature-dependent voltage references-one with positive and one with negative temperature coefficient-to define its -45°C trip point. Its comparator output asserts low on die temperature falling below threshold, with internal power-on reset guaranteeing stable output state for 50µs at startup.
Hysteresis selection (2°C or 10°C) is controlled by the HYST pin logic level (GND or VCC), and the open-drain TUNDER output sinks up to 1.2mA while supporting pull-up voltages exceeding VCC. Thermal resistance is minimized via Pin 2 (GND), which provides lowest θJA path to the die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Threshold | -45°C factory-programmed cold-trip point; asserts output when die temperature falls below this value |
| Threshold Accuracy | ±0.5°C (typ), ±6°C (max); enables high-confidence thermal alarm triggering without calibration |
| Supply Voltage Range | +2.7V to +5.5V; compatible with 3.3V and 5V logic domains and battery-powered systems |
| Supply Current | 30µA typical; supports always-on thermal monitoring in ultra-low-power applications |
| Hysteresis Options | 2°C (HYST = GND) or 10°C (HYST = VCC); prevents output oscillation near trip point |
| Output Type | Active-low open-drain TUNDER; interfaces directly with µP reset pins using external 100kΩ pull-up |
| Operating Temp Range | -55°C to +125°C ambient; validated for industrial and automotive under-hood environments |
Pinout & Package
SOT23-5 package with exposed thermal pad (not electrically connected); compact 2.9mm × 1.6mm footprint optimized for space-constrained PCB layouts and direct mounting under µP sockets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - GND | Ground reference and thermal sink | Both pins must be connected to system ground; Pin 2 provides lowest thermal resistance to die |
| 3 - HYST | Hysteresis select input | CMOS-compatible; tie to GND for 2°C hysteresis, VCC for 10°C; floating not allowed |
| 4 - VCC | Positive supply input | Accepts +2.7V to +5.5V; powers internal references, comparator, and POR circuit |
| 5 - TUNDER | Active-low open-drain output | Sinks up to 1.2mA; requires external pull-up; asserts low when die temp < -45°C |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Full thermal sensing functionality implemented internally-no resistors, capacitors, or trimming needed |
| ±0.5°C typical threshold accuracy | Enables reliable cold-temperature detection without system-level calibration overhead |
| 30µA supply current | Supports continuous monitoring in energy-sensitive applications such as battery-backed controllers |
| Pin-selectable hysteresis | Eliminates need for external hysteresis circuitry; reduces BOM count and layout complexity |
| Open-drain TUNDER output | Allows wired-OR configuration with other MAX650x devices for temperature-window alarm generation |
Applications
| Industrial PLC Temperature Monitoring | Embedded System Cold-Start Protection |
|---|---|
Use Scenario: Monitoring ambient temperature inside programmable logic controller enclosures during winter deployment. IC Role / Device Role / Timing Role: Cold-temperature switch asserting reset signal when enclosure drops below -45°C to prevent firmware corruption. Use Value: Prevents system boot failure due to crystallization of electrolytic capacitors or oscillator drift at sub-zero temperatures. |
Use Scenario: Ensuring safe operation of medical diagnostic equipment during cold storage transport before field deployment. IC Role / Device Role / Timing Role: TUNDER output holds microcontroller in reset until internal temperature rises above -45°C. Use Value: Eliminates risk of erroneous sensor readings or EEPROM write errors caused by low-temperature semiconductor behavior. |
| Automotive Cabin Controller Freeze Detection | Telecom Base Station Outdoor Unit Monitoring |
Use Scenario: Detecting freezing conditions inside vehicle cabin control modules mounted near exterior panels. IC Role / Device Role / Timing Role: Directly monitors module PCB temperature; triggers heater activation or warning flag on falling below -45°C. Use Value: Enables proactive freeze mitigation before condensation forms or plastic housings become brittle. |
Use Scenario: Monitoring outdoor radio unit baseplates in northern climates where ambient can reach -45°C. IC Role / Device Role / Timing Role: Provides cold-temperature alarm to central management system via open-drain wire-OR with hot-threshold counterpart. Use Value: Supports full temperature-window alarm (e.g., -45°C to +75°C) using only two ICs and one pull-up resistor. |
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 |
|---|---|---|---|
| MAX6503UKN035 | Factory-trimmed trip point of -35°C instead of -45°C; identical accuracy, supply current, and pinout | Suitable where less aggressive cold alarm threshold is acceptable (e.g., commercial-grade outdoor gear) | Select when system cold margin allows +10°C higher trip point; same PCB layout and firmware interface |
| LTC2992IMS#PBF | Integrated dual temperature monitor with digital I²C interface, ±1°C accuracy, and 40µA quiescent current | Provides programmable thresholds and telemetry; requires MCU firmware support and additional I²C lines | Choose when digital configurability and multi-zone monitoring outweigh analog simplicity and zero-component count |
Compared with MAX6503UKN045, MAX6503UKN035 offers identical analog performance at a different trip point, while LTC2992IMS#PBF trades pin-compatible simplicity for digital flexibility and higher system integration-requiring firmware changes and added communication overhead.
Availability
MAX6503UKN045 is available at Aetrix Electronics and suitable for industrial PLCs, embedded medical devices, automotive cabin controllers, and telecom outdoor units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6503UKN045 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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX6501–MAX6504 family was developed to deliver low-cost, zero-calibration thermal protection for space- and power-constrained systems-emphasizing micropower operation, SOT23 integration, and factory-trimmed reliability.
FAQ
What is the exact factory-programmed temperature threshold of MAX6503UKN045?
The MAX6503UKN045 has a factory-programmed cold-temperature trip point of -45°C. This means the TUNDER output asserts low when the die temperature falls below -45°C. The threshold is trimmed during manufacturing and specified with ±0.5°C typical accuracy over the full operating range. No user adjustment or external calibration is required for this fixed threshold.
Does MAX6503UKN045 require external components to operate?
No, MAX6503UKN045 requires no external components for basic operation. Its internal references, comparator, and power-on reset circuit enable standalone function. Only an external pull-up resistor (typically 100kΩ) on the TUNDER pin is needed to interface with µP reset inputs. No capacitors, resistors, or trimming networks are necessary-reducing BOM cost and board area.
How is hysteresis selected on MAX6503UKN045?
Hysteresis on MAX6503UKN045 is selected via the HYST pin: connect HYST to GND for 2°C hysteresis or to VCC for 10°C hysteresis. This pin is CMOS-compatible and must not be left floating, as undefined logic levels increase supply current. The selected hysteresis value prevents output oscillation when die temperature approaches the -45°C trip point.
Can MAX6503UKN045 be used in a temperature-window alarm configuration?
Yes, MAX6503UKN045 is designed for temperature-window alarms when paired with a hot-threshold device such as MAX6502UKP075. Its open-drain TUNDER output can be wire-ORed with the TOVER output of a hot-switch using a single pull-up resistor, generating a unified "out-of-range" signal. This configuration is explicitly supported in Maxim's application diagrams and requires no additional logic ICs.
What is the maximum allowable supply voltage for MAX6503UKN045?
The absolute maximum supply voltage for MAX6503UKN045 is +7V, but the recommended operating range is +2.7V to +5.5V. Operation outside this range may compromise accuracy or reliability. The device is fully specified and guaranteed over the +2.7V to +5.5V range, including all electrical characteristics such as supply current (30µA typ), threshold accuracy, and output behavior.
MAX6503UKN045 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Cold
- Switching Temperature:
- -45°C
- Accuracy:
- ±6°C
- Current - Output (Max):
- 20mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /UnderTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Hysteresis
- 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
MAX6503UKN045 FAQ
1.How can I place an order for MAX6503UKN045 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6503UKN045 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 MAX6503UKN045 reliable?
The price and inventory of MAX6503UKN045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6503UKN045 is usually 5 days.
3.What payment methods are accepted for MAX6503UKN045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6503UKN045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6503UKN045?
MAX6503UKN045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6503UKN045 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 MAX6503UKN045?
For technical support, including MAX6503UKN045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6503UKN045 requirements.
6.How does Aetrix verify that MAX6503UKN045 is sourced from the original manufacturer or authorized distributors?
All MAX6503UKN045 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 MAX6503UKN045 meets industry standards.
7.What is the process for return or replacement of MAX6503UKN045?
All MAX6503UKN045 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6503UKN045, 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 MAX6503UKN045 part is unused and in its original packaging.
Return procedure for MAX6503UKN045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6503UKN045 Tags
-
N34TS04MT3ETG
onsemi
-
MCP9501PT-095E/OT
Microchip Technology
-
TMP390AQDRLRQ1
Texas Instruments
-
TC6501P125VCTTR
Microchip Technology
-
LM26CIM5-RPA/NOPB
Texas Instruments
-
MCP9509HT-E/OT
Microchip Technology
-
MCP9509CT-E/OT
Microchip Technology
-
MCP9510HT-E/CH
Microchip Technology
-
TC622VOA
Microchip Technology
-
TC620CEOA
Microchip Technology
-
TC622VAT
Microchip Technology
-
MAX6509HAUK+T
Analog Devices Inc./Maxim Integrated
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…
