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Semtech Corporation SX8733EWLTRT
- Part No.:
- SX8733EWLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- Sensor and Detector Interfaces
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
SX8733EWLTRT.pdf
- Description:
- IC TEMP SENSOR 2PORT PROGR 6MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
SX8733EWLTRT from Semtech is a precision digital temperature sensor IC with SMBus 2.0 interface, integrating one on-chip PN junction for local temperature sensing and supporting up to three external diode sensors via two programmable analog ports (P1, P2). It delivers ±0.5°C remote diode accuracy from 25°C to 100°C, 0.125°C resolution across –40°C to 140°C, and 250 µA active current at 10 Hz sampling - used in thermal monitoring of printers, servers, and projector power stages.
For engineers reviewing the SX8733EWLTRT datasheet, pinout, applications, or equivalent options, this page provides verified pin functions, parasitic resistance cancellation methods (algorithmic/3-point), SMBus timing compliance (10–400 kHz), alarm threshold programming, and real-world thermal measurement constraints including trace resistance impact on diode sensing accuracy.
Technical Context
The SX8733EWLTRT implements dual-current-source diode biasing (I₂ = 100 µA, I₁ = 10 µA) to measure ΔVBE for temperature calculation, achieving 200 µV/°C sensitivity. Its internal ADC converts voltage differences into digital temperature values with selectable output formats (0°C–127°C or –40°C–140°C).
It supports three parasitic resistance cancellation techniques - algorithmic (up to 1 kΩ, optimal 20°C–70°C), 3-point (requires matched PCB traces), and Kelvin (4-wire, using P1/P2 sense + P3/P4 force) - but only algorithmic and 3-point are enabled on the SX8733 due to its 2-port MLPD-6 package limiting P3/P4 availability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±0.5°C over 25°C–100°C range - enables high-fidelity CPU/GPU thermal throttling without calibration. |
| Temperature Resolution | 0.125°C - sufficient for fine-grained fan speed control and thermal margining in server DIMMs. |
| Active Current | 250 µA at 10 Hz sampling - allows continuous monitoring in battery-backed systems without significant power penalty. |
| SMBus Frequency | 10–400 kHz - compatible with legacy and modern host controllers; timeout support prevents bus lockups. |
| Conversion Time | 100 ms per reading - defines minimum interval between valid temperature updates for alarm triggering. |
| Parasitic Resistance Cancellation | Algorithmic and 3-point modes only - eliminates up to 1 kΩ series trace resistance error without requiring extra pins. |
| Operating Voltage | 2.7–5.5 V - supports direct connection to 3.3 V or 5 V system rails without LDO. |
Pinout & Package
Package: MLPD-6 (exposed pad, thermally connected to ground plane for dissipation; not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - P1 | Programmable analog port / D1+ current source | Drives 100 µA or 10 µA to external diode anode; also serves as Alarm1 output (pseudo-open-drain). |
| 2 - VSS | Ground reference / D1− current sink | Common return path for local sensor and external diode cathodes; must be low-impedance for accurate ΔVBE. |
| 3 - SMBDAT | SMBus bidirectional data line | Open-drain I/O; requires external pull-up; handles register reads/writes and alarm status reporting. |
| 4 - SMBCLK | SMBus clock input | Open-drain input; synchronizes all serial transactions; supports timeout detection per SMBus v2.0. |
| 5 - VDD | Positive power supply | Accepts 2.7–5.5 V; powers internal regulator, ADC, and current sources; decoupling capacitor required. |
| 6 - P2 | Programmable analog port / D2+ current source | Second excitation port; enables differential or single-ended dual-sensor configuration; doubles as Alarm2 output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-current diode sensing | 100 µA / 10 µA sourcing enables precise ΔVBE measurement independent of diode ideality factor drift. |
| Algorithmic track resistance cancellation | Automatically compensates up to 1 kΩ series resistance in PCB traces - no layout matching or extra connections needed. |
| Configurable alarm outputs | P1 and P2 double as programmable ALARM1/ALARM2 signals - reduces external logic for thermal interrupt generation. |
| Two temperature output formats | Binary (0°C–127°C) and offset-binary (–40°C–140°C) modes simplify host firmware integration across industrial and consumer platforms. |
| SMBus v2.0 compliance | Includes TIMEOUT support and standard command set - ensures interoperability with BMCs, ECs, and embedded controllers. |
Applications
| Printer Thermal Management | Server CPU/GPU Monitoring |
|---|---|
|
Use Scenario: Real-time thermal tracking of fuser assembly and print head during high-duty-cycle operation. IC Role / Device Role / Timing Role: Local + 2 external diode sensing via P1/P2; algorithmic cancellation corrects for long flex-cable resistance. Use Value: Prevents thermal shutdown by detecting >100°C hotspots with ±0.5°C accuracy before mechanical damage occurs. |
Use Scenario: Remote diode monitoring of CPU socket and GPU VRM MOSFETs in 1U rack servers. IC Role / Device Role / Timing Role: Dual-sensor differential mode on P1/P2 rejects common-mode noise from switching regulators. Use Value: Enables dynamic fan curve adjustment with 0.125°C resolution, reducing acoustic noise while maintaining <95°C junction limits. |
| Projector Lamp Power Stage | Battery Charger Thermal Protection |
|
Use Scenario: Monitoring heat buildup in high-intensity discharge (HID) lamp driver transistors and ballast ICs. IC Role / Device Role / Timing Role: Single-ended external sensing on P1 with VSS return; 100 ms conversion time aligns with thermal time constants. Use Value: Triggers hard shutdown if lamp stage exceeds 125°C - preventing catastrophic capacitor failure or lens warping. |
Use Scenario: Temperature supervision of Li-ion battery pack cells and charging FETs in portable medical devices. IC Role / Device Role / Timing Role: Local sensor monitors IC die temp; P2 senses external NTC/diode on battery terminal. Use Value: Halts charging at 60°C using programmable under/over thresholds - meeting IEC 62368-1 thermal safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMMX/NOPB | MSOP-8, 2 remote channels, ±1.0°C remote accuracy (0°C–85°C), no algorithmic cancellation - relies on hardware 3-point method only. | Lacks integrated local sensor; requires external VREF; higher quiescent current (350 µA). | Choose when board space permits MSOP-8 and algorithmic cancellation is unnecessary due to short sensor traces. |
| MAX6642AESA+ | SOIC-8, 1 remote + 1 local channel, ±2.0°C remote accuracy (–25°C–100°C), SMBus-compatible but no timeout support. | No parasitic resistance cancellation; fixed 11-bit resolution (0.125°C); no differential sensing mode. | Select for cost-sensitive designs where ±2°C accuracy suffices and SMBus robustness is secondary. |
Compared with LM95235CIMMX/NOPB and MAX6642AESA+, the SX8733EWLTRT uniquely combines MLPD-6 compactness, ±0.5°C remote accuracy with algorithmic cancellation, and dual alarm outputs - making it optimal for space-constrained thermal safety-critical systems requiring minimal layout overhead.
Availability
SX8733EWLTRT is available at Aetrix Electronics and suitable for printer thermal management, server CPU/GPU monitoring, and projector lamp power stage applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SX8733EWLTRT 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
Semtech Corporation designs high-performance analog and mixed-signal semiconductors for communications, sensing, and power management applications, with headquarters in Camarillo, CA.
The SX8733EWLTRT belongs to Semtech's Precision Temperature Sensor family, engineered specifically for high-accuracy remote diode monitoring in thermally demanding computing and imaging equipment where trace resistance and noise immunity are critical.
FAQ
What is the maximum parasitic resistance the SX8733EWLTRT can compensate for using algorithmic cancellation?
The SX8733EWLTRT supports algorithmic track resistance cancellation up to 1 kΩ, with best accuracy achieved between 20°C and 70°C. This capability eliminates measurement errors caused by PCB trace resistance without requiring matched layouts or additional connections - a key advantage over alternatives like the MAX6642AESA+, which lacks any parasitic resistance compensation.
Does the SX8733EWLTRT support differential external sensor connections?
Yes, the SX8733EWLTRT supports differential external sensor connections using P1 and P2 as complementary current source/sink terminals. This configuration improves common-mode noise rejection in noisy environments such as server VRMs or projector lamp drivers - unlike the LM95235CIMMX/NOPB, which requires external components for true differential sensing.
How many temperature sensors can the SX8733EWLTRT monitor simultaneously?
The SX8733EWLTRT monitors one internal (on-chip PN junction) and up to two external diode sensors - limited by its two programmable ports (P1 and P2). While the datasheet mentions "up to 3 external sensors" for the family, that capability applies only to the SX8743/SX8744 variants with 4/3 ports; the SX8733EWLTRT is explicitly specified for 2 programmable ports in MLPD-6 packaging.
What SMBus features does the SX8733EWLTRT implement beyond basic read/write?
The SX8733EWLTRT implements full SMBus v2.0 compliance, including TIMEOUT detection (25–35 ms window), combined-format transactions, soft reset command, and alarm response protocol. These features ensure robust communication in multi-drop bus environments - unlike the MAX6642AESA+, which lacks TIMEOUT support and uses a simplified SMBus subset.
Is the exposed pad on the SX8733EWLTRT's MLPD-6 package electrically connected?
No, the exposed pad on the SX8733EWLTRT's MLPD-6 package is not electrically connected internally. It is intended solely for thermal dissipation and must be soldered to a grounded copper plane - consistent with Semtech's MLPD-W6-EP2 land pattern drawing. This differs from thermally enhanced QFN packages where the pad often connects to VSS.
SX8733EWLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 6-WDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Temperature Sensor
- Input Type:
- -
- Output Type:
- -
- Current - Supply:
- 250 µA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-MLPD-W (3x3)
SX8733EWLTRT FAQ
1.How can I place an order for SX8733EWLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SX8733EWLTRT 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 SX8733EWLTRT reliable?
The price and inventory of SX8733EWLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SX8733EWLTRT is usually 5 days.
3.What payment methods are accepted for SX8733EWLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SX8733EWLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SX8733EWLTRT?
SX8733EWLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SX8733EWLTRT 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 SX8733EWLTRT?
For technical support, including SX8733EWLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SX8733EWLTRT requirements.
6.How does Aetrix verify that SX8733EWLTRT is sourced from the original manufacturer or authorized distributors?
All SX8733EWLTRT 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 SX8733EWLTRT meets industry standards.
7.What is the process for return or replacement of SX8733EWLTRT?
All SX8733EWLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SX8733EWLTRT, 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 SX8733EWLTRT part is unused and in its original packaging.
Return procedure for SX8733EWLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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