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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Thermal Management

Microchip Technology EMC1501-1-AC3-TR

Name: EMC1501-1-AC3-TR
Brand: Microchip Technology
SKU: EMC1501-1-AC3-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: EMC1501-1-AC3-TR

Manufacturer:: Microchip Technology

Category:: Thermal Management

Package:: 8-WFDFN Exposed Pad

Datasheet:: EMC1501-1-AC3-TR.pdf

Description:: IC TEMP SENSOR 2WIRE 8TDFN

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Product details

Overview

EMC1501-1-AC3-TR from Microchip Technology is a JEDEC TSE2002av-compliant memory module temperature sensor and Serial Presence Detect (SPD) EEPROM. It integrates a ±1°C accurate internal temperature monitor (25°C–100°C), 2 kbit (256-byte) EEPROM with dual software protection, and SMBus 2.0/I²C interface - all operating across 1.8V/2.5V/3.3V supply ranges. It serves as the thermal intelligence and SPD data hub on DDR3/DDR4 DIMMs.

For engineers reviewing the EMC1501-1-AC3-TR datasheet, EMC1501-1-AC3-TR pinout, EMC1501-1-AC3-TR application, or EMC1501-1-AC3-TR equivalent, key selection considerations include JEDEC SPD compliance, 3-voltage-range flexibility, programmable temperature thresholds (T_HIGH/T_LOW/T_CRIT), EVENT pin configurability (interrupt/comparator, active-high/low), and integrated EEPROM write-cycle protection.

Technical Context

The EMC1501-1-AC3-TR implements a dedicated sigma-delta ADC for on-die temperature sensing and embeds a 256-byte SPD EEPROM organized in 16 pages of 16 bytes each. Its SMBus 2.0 interface supports Write Byte, Read Byte, Page Write, and Page Read protocols - with timeout reset (30 ms) and clock stretching support (host-initiated only).

It features three address-select pins (SA0–SA2) enabling up to eight unique SMBus addresses, dual EEPROM lock mechanisms (temporary SWP and permanent PSWP), and a configurable open-drain EVENT pin that asserts on threshold violation or critical event - all while maintaining JEDEC JC-42.4 compliance for memory module deployment.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Accuracy	±1°C from 25°C to 100°C - meets and exceeds JEDEC TSE2002av requirement for DIMM thermal monitoring.
Supply Voltage Range	1.7V–3.6V, with three defined operating bands (1.8V/2.5V/3.3V) - enables drop-in compatibility across DDR3L, DDR3, and DDR4 memory subsystems.
EEPROM Capacity	256 bytes (2 kbit), page-organized (16 × 16-byte pages) - stores full JEDEC SPD data including module timing, vendor ID, and thermal profile.
SMBus Interface	SMBus 2.0 and I²C-compatible 2-wire interface - supports up to 400 kHz (VDD > 2.3V) with ACK/NACK error signaling and page boundary enforcement.
EVENT Pin Function	Configurable open-drain output - operates as interrupt (level-sensitive) or comparator (threshold-triggered), active-high or active-low per register setting.
Operating Temperature	−40°C to +125°C - qualified for industrial-grade memory module environments including server and telecom applications.
Power Consumption	20 µA typical in JEDEC standby mode - minimizes impact on DIMM power budget during idle states.

Pinout & Package

EMC1501-1-AC3-TR is housed in an RoHS-compliant 8-pin TDFN package (2 mm × 3 mm, 0.5 mm pitch), with wettable flank leads for automated optical inspection. Thermal resistance θ_j-a = 89°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 (SA0)	Address Selection Input	Logic input with internal pull-down; sets LSB of 7-bit SMBus slave address (1010xxx). Tolerant to 10V.
2 (SA1)	Address Selection Input	Logic input with internal pull-down; sets middle bit of SMBus address. Used with SA0/SA2 for up to 8 device addresses on one bus.
3 (SA2)	Address Selection Input	Logic input with internal pull-down; sets MSB of SMBus address. Enables multi-drop SPD configuration on memory channels.
4 (GND)	Ground Reference	Primary return path for analog and digital circuits; must be low-impedance connection to system ground plane.
5 (SDA)	SMBus Data Line	Bi-directional open-drain I/O requiring external pull-up to VDD; carries address, command, and data bytes per SMBus protocol.
6 (SCL)	SMBus Clock Line	Input-only clock line requiring external pull-up; synchronizes all SMBus transactions; supports timeout reset if held low >30 ms.
7 (EVENT)	Interrupt/Comparator Output	Open-drain output requiring external pull-up; asserts on programmed temperature limit violation or critical event; polarity and function software-configurable.
8 (VDD)	Supply Voltage	Single positive supply input (1.7–3.6 V); powers internal ADC, EEPROM, and SMBus interface; decoupling capacitor required near pin.

Key Features

Feature	Design Value
JEDEC TSE2002av Compliance	Fully implements JC-42.4 SPD specification - ensures interoperability with standard DDR3/DDR4 memory controllers and BIOS initialization sequences.
Dual EEPROM Protection	Supports both temporary (SWP) and permanent (PSWP) write locks - prevents accidental or malicious SPD data corruption during system runtime or firmware updates.
Programmable Temperature Thresholds	Independent HIGH, LOW, and TCRIT registers - enables custom thermal throttling, alerting, and fail-safe shutdown logic in host memory controller or BMC.
Multi-Voltage Operation	Native 1.8V/2.5V/3.3V support - eliminates level-shifting requirements when used across mixed-voltage DIMM generations or in low-power mobile modules.
Configurable EVENT Pin	Software-selectable interrupt mode (latched or transparent) and polarity - simplifies integration with diverse host interrupt architectures without external logic.

Applications

DDR4 Server DIMMs	DDR3L Laptop Memory Modules
Use Scenario: Monitors die temperature of DDR4 RDIMMs in 1U/2U rack servers under sustained memory bandwidth load. IC Role / Device Role / Timing Role: SPD EEPROM + real-time temperature sensor - provides JEDEC-mandated thermal data to memory controller and BMC via SMBus. Use Value: Enables dynamic memory frequency scaling and thermal throttling to prevent DRAM data retention failure above 95°C.	Use Scenario: Embedded in DDR3L SO-DIMMs for ultrabooks, where space and power are constrained. IC Role / Device Role / Timing Role: Dual-function SPD + temperature monitor - shares single SMBus address with minimal PCB footprint (2×3 mm TDFN). Use Value: Reduces BOM count by replacing discrete SPD EEPROM + external temp sensor, cutting cost and layout complexity.
Telecom Baseband Memory	Industrial Embedded SODIMMs
Use Scenario: Monitors thermal drift in DDR3-based FPGA memory buffers in 5G baseband units operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: JEDEC-compliant SPD with extended temperature accuracy (±2°C from −20°C to 125°C) - feeds thermal compensation algorithms in FPGA fabric. Use Value: Maintains signal integrity and timing margin under wide-temperature cycling without recalibration.	Use Scenario: Used in fanless industrial PCs with DDR4 ECC SODIMMs deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Temperature-triggered EVENT pin drives local thermal warning LED or signals PLC via GPIO. Use Value: Provides deterministic over-temperature response without host CPU intervention - critical for safety-critical embedded control.

DDR4 Server DIMMs

DDR3L Laptop Memory Modules

Use Scenario: Monitors die temperature of DDR4 RDIMMs in 1U/2U rack servers under sustained memory bandwidth load.

IC Role / Device Role / Timing Role: SPD EEPROM + real-time temperature sensor - provides JEDEC-mandated thermal data to memory controller and BMC via SMBus.

Use Value: Enables dynamic memory frequency scaling and thermal throttling to prevent DRAM data retention failure above 95°C.

Use Scenario: Embedded in DDR3L SO-DIMMs for ultrabooks, where space and power are constrained.

IC Role / Device Role / Timing Role: Dual-function SPD + temperature monitor - shares single SMBus address with minimal PCB footprint (2×3 mm TDFN).

Use Value: Reduces BOM count by replacing discrete SPD EEPROM + external temp sensor, cutting cost and layout complexity.

Telecom Baseband Memory

Industrial Embedded SODIMMs

Use Scenario: Monitors thermal drift in DDR3-based FPGA memory buffers in 5G baseband units operating at −40°C to +85°C ambient.

IC Role / Device Role / Timing Role: JEDEC-compliant SPD with extended temperature accuracy (±2°C from −20°C to 125°C) - feeds thermal compensation algorithms in FPGA fabric.

Use Value: Maintains signal integrity and timing margin under wide-temperature cycling without recalibration.

Use Scenario: Used in fanless industrial PCs with DDR4 ECC SODIMMs deployed in factory automation cabinets.

IC Role / Device Role / Timing Role: Temperature-triggered EVENT pin drives local thermal warning LED or signals PLC via GPIO.

Use Value: Provides deterministic over-temperature response without host CPU intervention - critical for safety-critical embedded control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar memory module temperature sensing and SPD EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C02C-SSHM-T	Standalone 2 kbit I²C EEPROM only - no integrated temperature sensor or JEDEC SPD register map.	Requires external temperature IC (e.g., NTC thermistor + ADC) and firmware mapping to emulate SPD - increases design effort and validation scope.	Select only if SPD functionality is unnecessary and thermal monitoring is handled separately.
EMC1502-1-AC3-TR	Same pinout and firmware interface, but adds ±0.5°C accuracy (0°C–70°C) and extended EEPROM lock granularity (per-page).	Valid drop-in replacement where tighter thermal accuracy or finer-grained SPD write protection is required - no PCB or firmware changes needed.	Choose for high-reliability server or telecom applications demanding sub-degree thermal resolution in mid-range temperatures.

Compared with AT24C02C-SSHM-T, EMC1501-1-AC3-TR delivers integrated thermal awareness and JEDEC SPD compliance in one device; compared with EMC1502-1-AC3-TR, it offers proven cost-optimized performance for mainstream DDR3/DDR4 DIMMs without premium accuracy requirements.

Availability

EMC1501-1-AC3-TR is available at Aetrix Electronics and suitable for DDR4 server DIMMs, DDR3L laptop memory modules, telecom baseband memory, and industrial embedded SODIMMs requiring stable component supply, JEDEC compliance, and long-term memory module lifecycle support.

Supply support for EMC1501-1-AC3-TR 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

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, with deep expertise in embedded control and system-level integration.

The EMC1501 product line was designed specifically for JEDEC-compliant memory module thermal monitoring and SPD data storage - targeting DDR3, DDR3L, and DDR4 DIMM manufacturers needing single-chip SPD + temperature functionality.

FAQ

What voltage ranges does the EMC1501-1-AC3-TR support?

The EMC1501-1-AC3-TR operates across three defined supply ranges: 1.7–1.9 V (low), 2.3–2.7 V (middle), and 3.0–3.6 V (high). This enables direct use in DDR3L (1.35 V nominal), DDR3 (1.5 V), and DDR4 (1.2 V nominal with 1.8 V auxiliary rail) memory modules without level shifters. The EMC1501-1-AC3-TR maintains full SMBus and temperature accuracy specifications across all ranges.

How does the EMC1501-1-AC3-TR implement JEDEC SPD compliance?

The EMC1501-1-AC3-TR embeds a 256-byte EEPROM pre-mapped to the JEDEC TSE2002av SPD register layout (including SPD revision, module type, density, timings, and thermal data fields). It responds to standard SMBus addresses (1010xxx) and supports Page Read/Write for efficient SPD data access. The EMC1501-1-AC3-TR also includes hardware-enforced write protection to safeguard SPD integrity during system operation.

Can the EVENT pin on the EMC1501-1-AC3-TR be used as both interrupt and comparator?

Yes - the EVENT pin on the EMC1501-1-AC3-TR is software-configurable via the Configuration register to operate either as a latched interrupt (asserts until cleared) or as a transparent comparator (tracks real-time threshold status). Polarity (active-high/active-low) and source (T_HIGH, T_LOW, or T_CRIT) are independently programmable, allowing flexible integration with host interrupt controllers or simple GPIO monitoring.

What EEPROM protection mechanisms does the EMC1501-1-AC3-TR provide?

The EMC1501-1-AC3-TR implements two independent EEPROM protection modes: temporary software write protection (SWP), which can be cleared via SMBus command, and permanent software write protection (PSWP), which irreversibly locks the entire EEPROM after programming. Both are enforced at the hardware level - any write attempt to a locked region returns NACK and discards data, ensuring SPD data integrity against firmware bugs or malicious writes.

Is the EMC1501-1-AC3-TR pin-compatible with other Microchip SPD sensors?

Yes - the EMC1501-1-AC3-TR shares identical 8-pin TDFN (2 mm × 3 mm) packaging and pinout with the EMC1502-1-AC3-TR and EMC1505-1-AC3-TR. Firmware and PCB layout are fully interchangeable; differentiation lies in temperature accuracy grade (±1°C vs. ±0.5°C) and EEPROM lock granularity. No redesign is required when upgrading within this family for enhanced thermal performance.

EMC1501-1-AC3-TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Temp Monitoring System (Sensor)

Sensor Type:: Internal

Sensing Temperature:: -

Accuracy:: ±1%

Topology:: ADC, Multiplexer, Register Bank

Output Type:: I2C/SMBus

Output Alarm:: No

Output Fan:: No

Voltage - Supply:: 1.7V ~ 3.6V

Operating Temperature:: -20°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TDFN (2x3)

EMC1501-1-AC3-TR FAQ

1.How can I place an order for EMC1501-1-AC3-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for EMC1501-1-AC3-TR 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 EMC1501-1-AC3-TR reliable?

The price and inventory of EMC1501-1-AC3-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMC1501-1-AC3-TR is usually 5 days.

3.What payment methods are accepted for EMC1501-1-AC3-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMC1501-1-AC3-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for EMC1501-1-AC3-TR?

EMC1501-1-AC3-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your EMC1501-1-AC3-TR 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 EMC1501-1-AC3-TR?

For technical support, including EMC1501-1-AC3-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMC1501-1-AC3-TR requirements.

6.How does Aetrix verify that EMC1501-1-AC3-TR is sourced from the original manufacturer or authorized distributors?

All EMC1501-1-AC3-TR 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 EMC1501-1-AC3-TR meets industry standards.

7.What is the process for return or replacement of EMC1501-1-AC3-TR?

All EMC1501-1-AC3-TR units undergo pre-shipment inspection (PSI). If there is an issue with EMC1501-1-AC3-TR, 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 EMC1501-1-AC3-TR part is unused and in its original packaging.

Return procedure for EMC1501-1-AC3-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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