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Microchip Technology MCP40D17T-502E/LT
- Part No.:
- MCP40D17T-502E/LT
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MCP40D17T-502E/LT.pdf
- Description:
- IC DGTL POT 5KOHM 128TAP SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,531
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Product details
Overview
MCP40D17T-502E/LT from Microchip Technology is a 7-bit volatile digital potentiometer in SC70-6 package, configured as a rheostat with 5 kΩ end-to-end resistance, 128-step resolution, and I²C interface. It delivers low wiper resistance (100 Ω typ), 50 ppm/°C absolute tempco, and operates from 1.8V to 5.5V - used for precision sensor calibration and amplifier gain trimming in industrial temperature ranges.
For engineers reviewing the MCP40D17T-502E/LT datasheet, MCP40D17T-502E/LT pinout, MCP40D17T-502E/LT application, or MCP40D17T-502E/LT equivalent, key selection criteria include I²C address (0101110), rheostat-only terminal configuration (A/W/B), 5 kΩ RAB tolerance (±20%), extended -40°C to +125°C operation, and absence of nonvolatile memory.
Technical Context
The MCP40D17T-502E/LT implements a 128-tap resistor ladder controlled via standard/fast-mode I²C (up to 400 kHz), with command-code protocol supporting SMBus 2.0 write/read byte/word formats. Its rheostat topology connects terminals A and B externally, using W as adjustable current path - no internal potentiometer connection between A and B.
Brown-out reset (1.65 V typical) and power-on default wiper setting (mid-scale, 0x3F) ensure deterministic startup behavior. Analog performance is specified over 2.7V–5.5V; full 1.8V–5.5V range applies only to digital operation and basic functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RAB Resistance | 5.0 kΩ ±20% - defines maximum current-limiting range in rheostat mode |
| Resolution | 128 steps (7-bit) - enables 39.1 Ω minimum step size at 5 kΩ |
| Wiper Resistance | 100 Ω typical at 5.5 V - contributes <2% error at mid-scale in 5 kΩ configuration |
| Tempco (Absolute) | 50 ppm/°C (0°C to 70°C) - ensures <±0.35% RAB drift over industrial ambient range |
| I²C Address | 0101110 (0x2E) - fixed slave address; no alternate address option |
| Operating Voltage | 1.8 V to 5.5 V - digital logic functional down to 1.8 V; analog specs guaranteed ≥2.7 V |
| Bandwidth | 2 MHz typical (5 kΩ, code 0x3F) - supports AC-coupled signal adjustment up to audio band |
Pinout & Package
SC70-6 package: 1.25 mm × 2.0 mm footprint, 0.65 mm pitch, lead-free, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VSS) | Ground reference | Return path for all internal logic and resistor network; must be low-impedance |
| 2 (SCL) | I²C clock input | Drives internal state machine; Schmitt-triggered, supports 100/400 kHz modes |
| 3 (SDA) | I²C data bidirectional | Open-drain, requires external pull-up; handles command-code read/write sequences |
| 4 (VDD) | Power supply | Supplies core logic and resistor network; brown-out reset active below ~1.65 V |
| 5 (B) | Rheostat terminal B | Fixed end of resistor string; connected externally to load or ground in rheostat use |
| 6 (A) | Rheostat terminal A | Fixed end of resistor string; connected externally to voltage source or signal path |
Key Features
| Feature | Design Value |
|---|---|
| Volatile wiper memory | RAM-based setting resets to 0x3F on power-up - enables predictable startup without EEPROM wear |
| Rheostat-only topology | No internal A–B connection - eliminates parasitic leakage paths common in potentiometer ICs |
| Low quiescent current | 2.5 µA typical (inactive I²C, VDD = 5.5 V) - suitable for battery-backed or always-on calibration circuits |
| Extended temperature range | -40°C to +125°C operation - qualified for under-hood automotive and industrial control environments |
| Small-footprint SC70-6 | 1.25 mm × 2.0 mm body - saves PCB area vs. SOIC-8 or MSOP-8 alternatives |
Applications
| Pressure Sensor Calibration | RF Amplifier Biasing |
|---|---|
Use Scenario: Trimming offset in bridge-based piezoresistive pressure sensors across temperature. IC Role / Device Role / Timing Role: Rheostat adjusts reference leg current to null zero-point drift. Use Value: 50 ppm/°C tempco and 128-step resolution enable ≤0.1% full-scale calibration accuracy over -40°C to +125°C. | Use Scenario: Setting bias current for GaAs FET amplifiers in cellular base station front-ends. IC Role / Device Role / Timing Role: Digitally programmable current-limiting element in DC bias network. Use Value: 2 MHz bandwidth and 5 kΩ RAB support stable RF-stage biasing without signal coupling into control lines. |
| LCD Contrast Adjustment | Cost-Sensitive Trim Replacement |
Use Scenario: Dynamic contrast control in automotive infotainment displays exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Rheostat in voltage divider feeding LCD V0 pin. Use Value: Extended -40°C to +125°C rating and 1.8 V operation allow direct integration with low-voltage display controllers. | Use Scenario: Replacing mechanical trimpots in high-volume consumer power supplies. IC Role / Device Role / Timing Role: Programmable feedback resistor in TL431-based shunt regulator loop. Use Value: SC70-6 footprint and I²C interface reduce assembly cost vs. manual trim and eliminate field recalibration labor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rheostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4017T-502E/LT | Same SC70-6 package, identical I²C address (0x2E), same 5 kΩ RAB and rheostat config; simplified I²C command format | Higher throughput due to reduced command overhead; no functional difference in analog performance | Select when firmware requires faster wiper updates or simplified I²C stack implementation |
| MCP4532T-502E/MS | MSOP-8 package, 129-step resolution, 5 kΩ RAB, I²C interface, but includes HV interface capability and higher ESD rating (≥8 kV HBM) | Supports higher-voltage bias networks (up to 12 V); not drop-in due to different pinout and package | Select when operating above 5.5 V or requiring enhanced robustness in noisy industrial environments |
Compared with MCP4017T-502E/LT, the MCP40D17T-502E/LT uses standard I²C command codes and offers identical analog specs; versus MCP4532T-502E/MS, it trades HV tolerance and extra pins for smaller size and lower cost in 5.5 V systems.
Availability
MCP40D17T-502E/LT is available at Aetrix Electronics and suitable for pressure sensor calibration, RF amplifier biasing, LCD contrast adjustment, and cost-sensitive trim replacement requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for MCP40D17T-502E/LT 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with broad industrial and automotive qualification coverage.
The MCP40D17 series belongs to Microchip's volatile digital potentiometer product line, designed specifically for space-constrained, I²C-controlled rheostat applications demanding extended temperature operation and low-power calibration.
FAQ
What is the I²C address of the MCP40D17T-502E/LT?
The MCP40D17T-502E/LT has a fixed 7-bit I²C slave address of 0101110 (0x2E). Unlike the MCP40D18 variant, it does not offer an alternate address option. This address is used for all write and read operations, including wiper setting commands and status queries, and is compatible with standard and fast-mode I²C buses up to 400 kHz.
Does the MCP40D17T-502E/LT support potentiometer mode?
No, the MCP40D17T-502E/LT is configured exclusively as a rheostat. Its internal resistor network connects only between terminals A and B, with W as the movable tap - there is no internal connection enabling three-terminal potentiometer use. For potentiometer functionality, Microchip recommends the MCP40D18T-502E/LT, which shares the same package and RAB value but implements a true A–W–B potentiometer topology.
What is the power-on behavior of the MCP40D17T-502E/LT wiper?
The MCP40D17T-502E/LT initializes its wiper to mid-scale (0x3F, decimal 63) upon power-up or brown-out reset. This deterministic POR/BOR behavior ensures repeatable startup conditions without requiring host initialization. The wiper remains at this position until updated via I²C, and no external capacitor or timing circuit is needed to guarantee proper reset sequencing.
Can the MCP40D17T-502E/LT operate from 1.8 V?
Yes, the MCP40D17T-502E/LT supports digital operation down to 1.8 V, including I²C communication and wiper control. However, analog specifications - such as RAB tolerance, wiper resistance, and tempco - are only guaranteed over 2.7 V to 5.5 V. At 1.8 V, functionality is retained but analog accuracy degrades; design validation is required for critical 1.8 V analog paths.
Is nonvolatile memory available in the MCP40D17T-502E/LT?
No, the MCP40D17T-502E/LT uses volatile RAM for wiper storage only. It lacks EEPROM or Flash memory, so wiper settings are lost on power removal. For persistent settings, external microcontroller storage or alternative parts like the MCP4562T-502E/MS (I²C, EEPROM, 5 kΩ, rheostat) must be used. This architecture reduces cost and simplifies qualification for applications where deterministic power-on state suffices.
MCP40D17T-502E/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Rheostat
- Number of Circuits:
- 1
- Number of Taps:
- 128
- Resistance (Ohms):
- 5k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 1.8V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 150ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SC-70-6
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 155
MCP40D17T-502E/LT FAQ
1.How can I place an order for MCP40D17T-502E/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP40D17T-502E/LT 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 MCP40D17T-502E/LT reliable?
The price and inventory of MCP40D17T-502E/LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP40D17T-502E/LT is usually 5 days.
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MCP40D17T-502E/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP40D17T-502E/LT 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 MCP40D17T-502E/LT?
For technical support, including MCP40D17T-502E/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP40D17T-502E/LT requirements.
6.How does Aetrix verify that MCP40D17T-502E/LT is sourced from the original manufacturer or authorized distributors?
All MCP40D17T-502E/LT 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 MCP40D17T-502E/LT meets industry standards.
7.What is the process for return or replacement of MCP40D17T-502E/LT?
All MCP40D17T-502E/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP40D17T-502E/LT, 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 MCP40D17T-502E/LT part is unused and in its original packaging.
Return procedure for MCP40D17T-502E/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP40D17T-502E/LT Tags
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