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Microchip Technology MCP4432T-503E/ST
- Part No.:
- MCP4432T-503E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP4432T-503E/ST.pdf
- Description:
- IC DGT POT 50KOHM 129TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,667
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Product details
Overview
MCP4432T-503E/ST from Microchip Technology is a volatile 7-bit quad digital potentiometer configured as four independent rheostats, offering 50 kΩ end-to-end resistance (±20%), 129-tap resolution, 75 Ω typical wiper resistance, and I²C interface support up to 3.4 MHz. It operates from 1.8V to 5.5V and is used in precision gain/offset trimming of sensor signal chains and programmable biasing in industrial analog front-ends.
For engineers reviewing the MCP4432T-503E/ST datasheet, MCP4432T-503E/ST pinout, MCP4432T-503E/ST application, or MCP4432T-503E/ST equivalent, key selection criteria include its rheostat-only configuration, absence of nonvolatile memory, 50 kΩ RAB tolerance, extended temperature range (–40°C to +125°C), and high-voltage tolerant digital inputs (up to 12.5 V).
Technical Context
The MCP4432T-503E/ST implements four independent resistor networks (RAB0–RAB3), each with a digitally controlled wiper terminal (PxW) and two fixed terminals (PxA, PxB), configured exclusively for rheostat operation-no potentiometer mode. Wiper position is set via volatile RAM registers addressed over I²C using device-specific slave addresses determined by A1 and HVC/A0 pins.
It features terminal disconnect capability via TCON registers, brown-out reset protection at ~1.5 V, and internal weak pull-ups on all digital inputs except SCL/SDA. The device supports split-rail analog operation and maintains 2.5 µA serial interface inactive current at 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RAB Resistance | 50 kΩ ±20% - defines maximum adjustable resistance per channel; impacts current-sensing accuracy and thermal drift in rheostat applications |
| Resolution | 7-bit / 129 taps - provides discrete step size of ~388 Ω per increment at 50 kΩ; sufficient for coarse gain calibration but not fine-tuning |
| Wiper Resistance | 75 Ω typical - adds series offset to minimum resistance setting; critical for low-resistance rheostat use cases below 1 kΩ |
| I²C Speed | Up to 3.4 MHz - enables rapid wiper updates in closed-loop systems; requires ≤100 pF bus capacitance at high speed |
| Operating Voltage | 1.8V to 5.5V - supports mixed-supply systems; analog characteristics fully specified only from 2.7V |
| Tempco (Rheostat) | 50 ppm/°C typical (0°C–70°C) - determines resistance drift over temperature; affects long-term calibration stability in unregulated environments |
| Bandwidth (-3 dB) | 200 kHz typical (50 kΩ, code = 40h) - limits usable frequency range for AC signal adjustment; lower than 5 kΩ variant's 2 MHz |
Pinout & Package
Package: TSSOP-20 (4.4 mm × 6.5 mm, 0.65 mm pitch). Pinout validated per DS22267A-page 2 top-view diagram for MCP44X2 Quad Rheostat configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Supplies core logic and resistor network; must be stable between 1.8V–5.5V; decoupling required near pin |
| VSS | Ground reference | Analog and digital common return; separate routing recommended from noisy digital ground planes |
| SDA / SCL | I²C bidirectional data / clock | Open-drain pins requiring external pull-ups; support standard/fast/high-speed modes up to 3.4 MHz |
| HVC/A0 | High-voltage enable / address bit | Accepts up to 12.5 V; selects LSB of I²C address when used as A0; enables WiperLock when driven high |
| A1 | I²C address MSB | Configures upper address bit; combined with HVC/A0 determines full 7-bit slave address (0x2C–0x2F) |
| RESET | Active-low hardware reset | Asynchronous reset of wiper registers to mid-scale (0x40); requires ≥50 ns pulse width |
| P0A–P0B, P1A–P1B, P2A–P2B, P3A–P3B | Resistor network terminals | Fixed end terminals for four independent rheostats; polarity unrestricted (A/B interchangeable) |
| P0W–P3W | Wiper outputs | Digitally positioned sliding contacts; connected internally to TCON-controlled switches for terminal disconnect |
Key Features
| Feature | Design Value |
|---|---|
| Rheostat-only architecture | Guarantees no unintended potentiometer behavior; simplifies PCB layout by eliminating need for A/B terminal isolation |
| Terminal disconnect via TCON | Enables complete isolation of resistor networks during power-down or fault conditions-critical for safety-critical bias control |
| High-voltage tolerant digital inputs | Allows direct interfacing with 5 V, 12 V, or mixed-voltage control buses without level-shifting circuitry |
| Brown-out reset at 1.5 V | Prevents erratic wiper states during power ramp-up/down; ensures known mid-scale default on undervoltage |
| Extended temperature range | Rated for –40°C to +125°C operation-validated for under-hood automotive sensors and industrial motor drives |
Applications
| Industrial Sensor Calibration | Programmable Current Limiting |
|---|---|
Use Scenario: Trimming offset/gain in 4–20 mA transmitter circuits with RTD or strain gauge inputs. IC Role / Device Role / Timing Role: Rheostat element in feedback path of instrumentation amplifier or DAC output buffer. Use Value: Enables field recalibration without hardware modification; 50 kΩ range matches typical loop impedance requirements. | Use Scenario: Setting precise current limit thresholds in DC-DC converter overcurrent protection circuits. IC Role / Device Role / Timing Role: Adjustable shunt resistor in current-sense amplifier feedback loop. Use Value: Allows software-defined trip points across production batches; 75 Ω wiper resistance minimizes error at low-setpoint configurations. |
| Laser Diode Bias Control | Audio Channel Balance |
Use Scenario: Dynamic bias current adjustment for telecom laser diodes operating in harsh thermal environments. IC Role / Device Role / Timing Role: Series rheostat controlling base drive to laser driver transistor. Use Value: 50 ppm/°C tempco ensures <±0.5% resistance drift over –40°C to +85°C-maintains optical power stability. | Use Scenario: Real-time left/right channel volume balancing in professional audio mixing consoles. IC Role / Device Role / Timing Role: Four independent rheostats adjusting gain in analog op-amp stages per channel. Use Value: 3.4 MHz I²C allows sub-millisecond updates synchronized to audio frame timing; TSSOP-20 fits dense PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rheostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP4432T-503E/UN | TSSOP-20 package same; identical electrical specs; UN suffix denotes tape-and-reel packaging vs ST's tray | No functional difference; UN preferred for automated SMT assembly; ST suitable for prototyping or low-volume hand soldering | Select MCP4432T-503E/UN for high-volume production; MCP4432T-503E/ST for evaluation or small-batch builds |
| MCP4452T-503E/ST | 8-bit resolution (257 taps), same 50 kΩ RAB, same package; higher resolution improves step granularity (~195 Ω/step) | Preferred where finer rheostat adjustment is needed-e.g., precision medical instrument calibration-without changing layout | Choose MCP4452T-503E/ST if 7-bit step size is insufficient; verify firmware supports 8-bit register writes |
Compared with MCP4432T-503E/ST, the /UN variant offers identical performance in tape-and-reel form for pick-and-place, while the MCP4452T-503E/ST delivers doubled resolution at same RAB and package-enabling tighter tolerance control in calibration-critical systems.
Availability
MCP4432T-503E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable current limiting, and laser diode bias control requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MCP4432T-503E/ST 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 devices, and Flash-IP solutions, headquartered in Chandler, Arizona.
The MCP443X family delivers volatile quad digital potentiometers optimized for cost-sensitive, high-volume analog trimming applications where nonvolatile storage is unnecessary and fast I²C reconfiguration is prioritized.
FAQ
What is the RAB resistance tolerance for MCP4432T-503E/ST?
The MCP4432T-503E/ST has a nominal RAB resistance of 50 kΩ with a tolerance of ±20%, as specified in DS22267A-page 5. This means the actual end-to-end resistance falls between 40 kΩ and 60 kΩ at room temperature and nominal VDD. The tolerance applies to all four channels and is measured terminal-to-terminal (A to B) with wiper disconnected.
Does MCP4432T-503E/ST support potentiometer mode?
No, MCP4432T-503E/ST is configured exclusively as a quad rheostat. Per DS22267A-page 2 device table and block diagram, it lacks potentiometer functionality. Each channel provides only two fixed terminals (PxA, PxB) and one wiper (PxW); floating either A or B terminal is required for rheostat use, and no internal A–W–B three-terminal topology is implemented.
What is the maximum I²C clock frequency supported by MCP4432T-503E/ST?
MCP4432T-503E/ST supports I²C clock frequencies up to 3.4 MHz in high-speed mode, as confirmed in DS22267A-page 13 Table 1-2. This requires VDD ≥ 4.5 V and bus capacitance ≤ 100 pF. At lower voltages (2.7–5.5 V), it supports 400 kHz (fast mode) and 100 kHz (standard mode) with higher capacitance allowances up to 400 pF.
Is MCP4432T-503E/ST compatible with 3.3 V and 5 V I²C buses?
Yes, MCP4432T-503E/ST is compatible with both 3.3 V and 5 V I²C buses. Its digital inputs (HVC/A0, A1, RESET, SDA, SCL) tolerate voltages up to 12.5 V, and VIH/VIL thresholds scale with VDD (e.g., VIH = 0.45×VDD for non-SDA/SCL pins). SDA/SCL meet I²C specification levels across 1.8–5.5 V VDD, enabling direct connection to mixed-voltage systems without level shifters.
What happens to wiper positions during power loss on MCP4432T-503E/ST?
Wiper positions in MCP4432T-503E/ST are volatile and reset to mid-scale (0x40) on power-up or brown-out due to POR/BOR circuitry. DS22267A-page 2 confirms "POR Wiper Setting = Mid-Scale" for MCP4432. No nonvolatile memory is present-unlike MCP4442/MCP4462-so all wiper values must be reloaded by host firmware after each power cycle.
MCP4432T-503E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Rheostat
- Number of Circuits:
- 4
- Number of Taps:
- 129
- Resistance (Ohms):
- 50k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 1.8V ~ 5.5V
- Features:
- Selectable Address
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 150ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 75
MCP4432T-503E/ST FAQ
1.How can I place an order for MCP4432T-503E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP4432T-503E/ST 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 MCP4432T-503E/ST reliable?
The price and inventory of MCP4432T-503E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP4432T-503E/ST is usually 5 days.
3.What payment methods are accepted for MCP4432T-503E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP4432T-503E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP4432T-503E/ST?
MCP4432T-503E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP4432T-503E/ST 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 MCP4432T-503E/ST?
For technical support, including MCP4432T-503E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP4432T-503E/ST requirements.
6.How does Aetrix verify that MCP4432T-503E/ST is sourced from the original manufacturer or authorized distributors?
All MCP4432T-503E/ST 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 MCP4432T-503E/ST meets industry standards.
7.What is the process for return or replacement of MCP4432T-503E/ST?
All MCP4432T-503E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP4432T-503E/ST, 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 MCP4432T-503E/ST part is unused and in its original packaging.
Return procedure for MCP4432T-503E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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