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Microchip Technology MCP45HV51-103E/ST
- Part No.:
- MCP45HV51-103E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP45HV51-103E/ST.pdf
- Description:
- IC DGT POT 10KOHM 256TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP45HV51-103E/ST from Microchip Technology is an 8-bit volatile digital potentiometer with ±18V (±36V terminal) analog voltage support, 10 kΩ RAB resistance, I²C interface up to 3.4 MHz, and operation from -40°C to +125°C - used for precision high-voltage biasing in industrial power supplies and motor control feedback loops.
For engineers reviewing the MCP45HV51-103E/ST datasheet, MCP45HV51-103E/ST pinout, MCP45HV51-103E/ST application, or MCP45HV51-103E/ST equivalent, key selection criteria include its 10 kΩ wiper current rating (12.5 mA), low 75 Ω typical wiper resistance, 15 ppm ratiometric tempco, and TSSOP-14 package compatibility with high-side sensing topologies.
Technical Context
The MCP45HV51-103E/ST implements a single 8-bit resistor network (256 taps) with dual-rail architecture: V+/V− supplies the analog terminals (P0A/P0W/P0B) at up to +36V total swing, while VL/DGND powers the I²C logic (1.8–5.5V). Its Write Latch (WLAT) pin enables zero-crossing wiper updates, and SHDN/TCON registers allow dynamic terminal disconnect.
It features independent POR/BOR circuits for analog (3.5V threshold) and digital (1.5V threshold) rails, ensuring reliable initialization across asymmetric supply sequencing. The device supports rheostat mode via floating terminal A or B, and achieves 240 kHz bandwidth at 10 kΩ load with ±1 LSB settling in ≤1 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RAB Resistance | 10 kΩ ±20% - defines full-scale adjustment range and maximum wiper current (12.5 mA at 36V) |
| Resolution | 8-bit (256 taps) - provides 0.39% step resolution for fine-grained analog tuning |
| Analog Voltage Range | +36V terminal-to-terminal (V+ to V−), ±18V relative to DGND - enables direct integration into ±15V op-amp or gate-driver bias networks |
| I²C Speed | Up to 3.4 MHz - supports fast configuration in real-time closed-loop systems without bus contention |
| Wiper Resistance | 75 Ω typical - minimizes insertion error in low-impedance feedback paths (e.g., current-sense amplifier gain setting) |
| Tempco (Ratiometric) | 15 ppm/°C - ensures stable voltage division ratio over temperature in precision reference dividers |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
Pinout & Package
TSSOP-14 package with exposed pad (EP); 14-pin surface-mount outline optimized for thermal dissipation in high-power analog circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 14, 15, 17, 18, 20 | NC | No internal connection - must be left unconnected or tied to DGND per layout guidelines |
| 3 | P0B | Resistor network terminal B - connected to low-side reference (e.g., V− or ground) in potentiometer mode |
| 4 | P0W | Wiper output - delivers adjustable voltage/current; low 75 Ω resistance critical for signal integrity |
| 5 | A0 | I²C address LSB - sets device address (0x2C or 0x2D) when paired with A1 for multi-drop bus |
| 6 | A1 | I²C address MSB - enables up to four devices on same I²C bus without address conflict |
| 7 | SCL | I²C clock input - accepts 3.4 MHz max; Schmitt-triggered for noise immunity in noisy industrial environments |
| 8 | SDA | I²C bidirectional data - open-drain with 5 mA sink capability; supports standard/fast/high-speed modes |
| 9 | VL | Digital supply - powers logic core; must be ≥ V− + 2.7V to ensure POR functionality |
| 10 | DGND | Digital ground - reference for I²C and control pins; may float between V− and V+ in ±18V configurations |
| 11 | V+ | Analog positive supply - sets upper rail for P0A/P0W/P0B; max 36V above V− |
| 12 | SHDN | Active-low shutdown - disconnects resistor terminals to reduce leakage and power in standby |
| 13 | P0A | Resistor network terminal A - connected to high-side source (e.g., V+ or regulated bias) in potentiometer mode |
| 16 | V− | Analog negative supply - sets lower rail; may be -18V in bipolar configurations |
| 19 | WLAT | Write latch enable - holds wiper register until asserted low, enabling synchronized zero-crossing updates |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage analog rail | Supports ±18V (36V total) terminal voltage - eliminates need for level-shifting circuitry in HV feedback paths |
| Volatile wiper memory | 8-bit register resets to 0x7F (mid-scale) on POR/BOR - ensures known startup state for safety-critical biasing |
| Terminal disconnect control | SHDN pin + TCON register - enables dynamic isolation of P0A/P0W/P0B to prevent loading during calibration |
| Low wiper resistance | 75 Ω typical - reduces gain error in op-amp gain-setting networks and improves THD in audio bias applications |
| Extended temperature range | -40°C to +125°C operation - validated for use in engine control units and industrial inverters without derating |
| I²C interface with address pins | A0/A1 allow four unique addresses (0x2C–0x2F) - simplifies multi-pot designs in compact space-constrained PCBs |
Applications
| Industrial Power Supply Trim | Motor Drive Gate Bias Control |
|---|---|
Use Scenario: Adjusting output voltage setpoint in isolated DC-DC converters with optocoupler feedback. IC Role / Device Role / Timing Role: Precision voltage divider element in secondary-side error amplifier reference path. Use Value: 15 ppm ratiometric tempco maintains ±0.1% output regulation over -40°C to +125°C ambient. |
Use Scenario: Setting gate drive voltage for high-side IGBTs in three-phase inverter stages. IC Role / Device Role / Timing Role: Programmable bias resistor in gate driver IC's VGE reference network. Use Value: ±18V analog rail allows direct connection to ±15V gate driver supplies without external level shifters. |
| Laser Diode Current Limit | Programmable Sensor Excitation |
Use Scenario: Calibrating current limit threshold in fiber-optic transceiver laser drivers. IC Role / Device Role / Timing Role: Adjustable shunt resistor in high-side current sense amplifier feedback loop. Use Value: 12.5 mA wiper current rating supports 36V compliance voltage across 10 kΩ, enabling >400 mW dissipation capability. |
Use Scenario: Configuring excitation voltage for RTD or strain gauge bridges in process instrumentation. IC Role / Device Role / Timing Role: Precision ratiometric divider supplying bridge reference voltage from stable analog rail. Use Value: Low 75 Ω wiper resistance minimizes self-heating error and maintains <0.01% linearity in 4-wire Kelvin sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP45HV51-103E/MQ | VQFN-20 (5×5 mm) package vs. TSSOP-14; identical electrical specs and pinout mapping | Better thermal performance (2800 mW vs. 1000 mW) required in high-power density motor drives | Select for improved heat dissipation where board space permits QFN mounting |
| MCP45HV31-103E/ST | 7-bit resolution (128 taps) vs. 8-bit; same RAB, voltage ratings, and I²C interface | Lower cost and reduced firmware overhead where 0.78% step resolution suffices (e.g., coarse LED dimming) | Select when 128-step granularity meets system accuracy requirements and BOM cost is prioritized |
Compared with MCP45HV51-103E/MQ, the /ST variant offers smaller footprint and simpler reflow but lower thermal capacity; versus MCP45HV31-103E/ST, it delivers twice the resolution for applications requiring sub-0.5% analog tuning fidelity.
Availability
MCP45HV51-103E/ST is available at Aetrix Electronics and suitable for industrial power supplies, motor control systems, and laser diode biasing requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MCP45HV51-103E/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 is a global semiconductor company specializing in microcontrollers, analog components, and timing solutions for industrial, automotive, and communications markets.
The MCP45HVX1 product line delivers high-voltage digital potentiometers designed for precision analog trimming in systems with ±18V rails, targeting applications like programmable power supplies, motor drives, and sensor conditioning where traditional low-voltage pots fail.
FAQ
What is the maximum analog voltage rating for the MCP45HV51-103E/ST?
The MCP45HV51-103E/ST supports a maximum terminal-to-terminal analog voltage of +36V (V+ to V−), with operation possible in ±18V configurations relative to DGND. This allows direct use in high-voltage op-amp bias networks and industrial power supply feedback loops without external level-shifting circuitry. Absolute maximum ratings specify V+ to DGND ≤ 40V and V− to DGND ≥ −40V.
Does the MCP45HV51-103E/ST retain wiper settings after power loss?
No, the MCP45HV51-103E/ST uses volatile wiper memory only - settings are lost when power is removed. Upon power-on reset or brown-out reset, the wiper defaults to 0x7F (mid-scale) for 8-bit operation. For nonvolatile storage, external EEPROM or MCU-based retention logic must be implemented; Microchip does not integrate EEPROM in this device family.
How does the WLAT pin function in the MCP45HV51-103E/ST?
The WLAT (Write Latch) pin on the MCP45HV51-103E/ST controls synchronous updating of the volatile wiper register. When WLAT is held high, I²C writes to the wiper register are buffered but not applied; only when WLAT transitions low does the stored value latch to the resistor network. This enables zero-crossing updates in AC-coupled systems to avoid transient glitches during wiper movement.
Can the MCP45HV51-103E/ST be used in rheostat mode?
Yes, the MCP45HV51-103E/ST supports rheostat configuration by leaving either terminal A or B unconnected (floating), using only P0W and the remaining terminal. In this mode, it functions as a two-terminal variable resistor with 10 kΩ nominal resistance and 12.5 mA maximum wiper current. The datasheet confirms rheostat integral nonlinearity of ±1.0 LSB at 36V delta across the terminals.
What is the thermal performance difference between TSSOP-14 and VQFN-20 packages for the MCP45HV51-103E/ST?
The TSSOP-14 package (MCP45HV51-103E/ST) has a maximum package power dissipation of 1000 mW at TA = +50°C, while the VQFN-20 variant (MCP45HV51-103E/MQ) supports 2800 mW under identical conditions due to its exposed pad and superior thermal conductivity. This makes the /MQ version preferable in high-current applications like gate bias networks where >1 W analog power dissipation occurs.
MCP45HV51-103E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 10k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 1.8V ~ 5.5V, 10V ~ 36V, ±5V ~ 18V
- Features:
- Mute, Selectable Address
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 100ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 145
MCP45HV51-103E/ST FAQ
1.How can I place an order for MCP45HV51-103E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP45HV51-103E/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 MCP45HV51-103E/ST reliable?
The price and inventory of MCP45HV51-103E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP45HV51-103E/ST is usually 5 days.
3.What payment methods are accepted for MCP45HV51-103E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP45HV51-103E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP45HV51-103E/ST?
MCP45HV51-103E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP45HV51-103E/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 MCP45HV51-103E/ST?
For technical support, including MCP45HV51-103E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP45HV51-103E/ST requirements.
6.How does Aetrix verify that MCP45HV51-103E/ST is sourced from the original manufacturer or authorized distributors?
All MCP45HV51-103E/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 MCP45HV51-103E/ST meets industry standards.
7.What is the process for return or replacement of MCP45HV51-103E/ST?
All MCP45HV51-103E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP45HV51-103E/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 MCP45HV51-103E/ST part is unused and in its original packaging.
Return procedure for MCP45HV51-103E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP45HV51-103E/ST Tags
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MCP4018T-103E/LT
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