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Analog Devices Inc./Maxim Integrated MAX5428EGA
- Part No.:
- MAX5428EGA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Potentiometers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
MAX5428EGA.pdf
- Description:
- MAX5428 ONE-TIME PROGRAMMABLE, L
- Quantity:
- Payment:
- Shipping:
Inventory:1,032
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Product details
Overview
MAX5428EGA from Maxim Integrated is a one-time programmable, linear-taper digital potentiometer with 50kΩ end-to-end resistance, 32 wiper positions, and ultra-low 1.5µA static supply current. It replaces mechanical potentiometers in precision calibration circuits, operates from 2.7V to 5.5V, and features user-defined power-on reset position via 2-wire serial interface.
For engineers reviewing the MAX5428EGA datasheet, MAX5428EGA pinout, MAX5428EGA application, or MAX5428EGA equivalent, key selection considerations include its OTP capability for factory-set POR position, ±1 LSB integral nonlinearity, 35ppm/°C end-to-end tempco, and QFN-EP package suitability for space-constrained analog trimming and sensor offset adjustment.
Technical Context
The MAX5428EGA implements a 32-position decoder and up/down counter controlled by CS and U/D signals, enabling sequential wiper adjustment without address decoding. Its one-time programmable block stores wiper position at power-up and optionally disables the serial interface after six programming pulses.
It supports two operational modes: increment mode (U/D high at CS falling edge) and decrement mode (U/D low at CS falling edge), with make-before-break wiper switching to prevent open-circuit transients. The VPP pin accepts 11V for OTP programming, while normal operation requires VPP grounded or floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| End-to-End Resistance | 50kΩ - defines full-scale voltage division ratio and load on driving circuitry |
| Wiper Positions | 32 taps - provides 5-bit resolution for fine analog gain/offset control |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interface with 3.3V and 5V microcontrollers and analog front-ends |
| Static Supply Current | 1.5µA max - supports always-on battery-powered calibration without measurable drain |
| Temperature Coefficient | 35ppm/°C end-to-end - ensures stable resistance over -40°C to +85°C industrial range |
| Integral Nonlinearity | ±1 LSB - guarantees monotonicity and predictable transfer function for closed-loop tuning |
| Ratiometric Tempco | 5ppm/°C - maintains precise voltage-divider ratio stability under temperature variation |
Pinout & Package
The MAX5428EGA is housed in an 8-pin QFN-EP package with exposed paddle connected to GND, offering low thermal resistance and compact footprint (3mm × 3mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (W) | Wiper output | Provides adjustable tap point between H and L; make-before-break switching prevents signal interruption |
| 2 (CS) | Chip-select input | Active-low enable for serial interface; also triggers OTP programming sequence when pulsed with VPP = 11V |
| 3 (VDD) | Positive supply | Single 2.7V–5.5V rail powers logic and resistor array; no separate analog/digital supplies required |
| 4 (GND) | Ground reference | Common return for VDD, VPP, and signal terminals; exposed paddle must be soldered to PCB ground plane |
| 5 (VPP) | OTP programming voltage | 11V input enables permanent wiper position storage or interface lockout; float or ground during normal operation |
| 6 (U/D) | Up/down control | Determines increment/decrement direction on CS edge; controls single-step movement when CS transitions high |
| 7 (L) | Low terminal | Fixed end of resistor array; used as reference node in variable-resistor or potentiometer configurations |
| 8 (H) | High terminal | Fixed end of resistor array; connects to VDD or signal source depending on application topology |
Key Features
| Feature | Design Value |
|---|---|
| One-time programmable wiper position | Enables permanent factory calibration without external EEPROM or firmware storage |
| User-defined power-on reset position | Eliminates startup drift by restoring exact trim setting after power cycle |
| 32-tap linear taper | Delivers predictable, monotonic voltage division for feedback loop compensation |
| Ultra-low 1.5µA static current | Permits integration into energy-sensitive systems like portable medical sensors and IoT nodes |
| 2-wire serial interface | Reduces PCB routing complexity vs. SPI/I²C; requires only CS and U/D GPIOs |
Applications
| Medical Sensor Calibration | Industrial Transmitter Trimming |
|---|---|
Use Scenario: Calibrating zero-offset and gain in handheld blood glucose meters before shipment. IC Role / Device Role / Timing Role: Digital potentiometer providing factory-programmed trim for analog front-end DC bias and scaling. Use Value: Eliminates manual potentiometer adjustment and rework; ensures consistent accuracy across production batches. | Use Scenario: Setting 4–20mA loop transmitter output span and zero points during final test. IC Role / Device Role / Timing Role: One-time programmable resistor network defining reference ratios for DAC output scaling. Use Value: Prevents field tampering post-calibration while maintaining traceable, repeatable trim values. |
| Automotive Cabin Sensor Biasing | Test Equipment Front-End Adjustment |
Use Scenario: Compensating thermistor-based cabin temperature sensor drift across -40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable (35ppm/°C) adjustable divider setting bias point in analog signal chain. Use Value: Maintains measurement accuracy without software compensation or additional components. | Use Scenario: Configuring input attenuation and offset in benchtop multimeters and oscilloscope channels. IC Role / Device Role / Timing Role: Precision 50kΩ digital potentiometer enabling automated self-calibration routines. Use Value: Supports NIST-traceable calibration without mechanical wear or contact resistance degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5171BRMZ-50 | 50kΩ I²C-compatible digital pot; no OTP; 64 taps; 5ppm/°C ratiometric tempco | Requires I²C host and firmware support; lacks permanent POR position storage | Select when dynamic runtime adjustment is needed and OTP is not required |
| MCP41050-I/P | 50kΩ SPI digital pot; volatile wiper register; 257 taps; 150ppm/°C end-to-end tempco | No power-on memory; higher tempco reduces accuracy over temperature | Select for cost-sensitive designs where frequent recalibration is acceptable |
Compared with AD5171BRMZ-50 and MCP41050-I/P, the MAX5428EGA uniquely delivers factory-lockable wiper position, ultra-low quiescent current, and superior temperature stability-making it optimal for unattended, maintenance-free calibration in industrial and medical devices.
Availability
MAX5428EGA is available at Aetrix Electronics and suitable for medical sensor calibration, industrial transmitter trimming, and automotive cabin sensor biasing requiring stable component supply and long-term calibration integrity.
Supply support for MAX5428EGA 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications.
The MAX5427/MAX5428/MAX5429 family targets factory-calibrated systems needing permanent, tamper-resistant analog trimming-replacing mechanical pots with guaranteed monotonicity and low tempco.
FAQ
What is the end-to-end resistance value specified for the MAX5428EGA?
The MAX5428EGA has a nominal end-to-end resistance of 50kΩ, with a guaranteed range of 37.5kΩ to 62.5kΩ across temperature and process variation. This value is confirmed in the Electrical Characteristics table under "End-to-End Resistance" for MAX5428, and applies specifically to the MAX5428EGA variant in QFN-EP packaging.
Does the MAX5428EGA retain its wiper position after power cycling?
Yes-the MAX5428EGA retains its wiper position after power cycling only if programmed with five OTP pulses to set a user-defined power-on reset (POR) position. Without programming, it defaults to tap 16 at power-up. The POR position is stored permanently in on-chip nonvolatile memory and does not require backup power or external storage.
Can the MAX5428EGA be used in a 3.3V system?
Yes-the MAX5428EGA operates from 2.7V to 5.5V, making it fully compatible with 3.3V systems. Its digital inputs (CS, U/D) have CMOS-compatible thresholds (VIH = 0.7×VDD, VIL = 0.3×VDD), and static supply current remains ≤1.5µA at 3.3V, ensuring reliable interface with 3.3V microcontrollers and low-power analog circuitry.
What is the function of the VPP pin on the MAX5428EGA?
The VPP pin on the MAX5428EGA supplies 11V for one-time programming operations. During normal operation, VPP must be connected to GND or left floating. Applying 11V to VPP while pulsing CS enables permanent storage of the wiper position (five pulses) or full interface lockout (six pulses). No voltage is applied to VPP in standard trim mode.
Is the MAX5428EGA pin-compatible with other variants in the MAX5427/MAX5428/MAX5429 family?
Yes-the MAX5428EGA shares identical pinout and package dimensions with MAX5427EGA and MAX5429EGA (all 8-pin QFN-EP). The only functional difference is end-to-end resistance (50kΩ for MAX5428EGA vs. 100kΩ or 10kΩ), allowing drop-in substitution where resistance value meets design requirements.
MAX5428EGA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 32
- Resistance (Ohms):
- 50k
- Interface:
- I2C, Up/Down (U/D, CS)
- Memory Type:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- -
- Temperature Coefficient (Typ):
- 35ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-QFN-EP (3x3)
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 100
MAX5428EGA FAQ
1.How can I place an order for MAX5428EGA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5428EGA 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 MAX5428EGA reliable?
The price and inventory of MAX5428EGA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5428EGA is usually 5 days.
3.What payment methods are accepted for MAX5428EGA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5428EGA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5428EGA?
MAX5428EGA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5428EGA 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 MAX5428EGA?
For technical support, including MAX5428EGA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5428EGA requirements.
6.How does Aetrix verify that MAX5428EGA is sourced from the original manufacturer or authorized distributors?
All MAX5428EGA 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 MAX5428EGA meets industry standards.
7.What is the process for return or replacement of MAX5428EGA?
All MAX5428EGA units undergo pre-shipment inspection (PSI). If there is an issue with MAX5428EGA, 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 MAX5428EGA part is unused and in its original packaging.
Return procedure for MAX5428EGA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX5428EGA Tags
-
MCP4018T-103E/LT
Microchip Technology
-
MCP4018T-503E/LT
Microchip Technology
-
MCP4011T-103E/SN
Microchip Technology
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MCP4018T-104E/LT
Microchip Technology
-
MCP4017T-503E/LT
Microchip Technology
-
MCP4018T-502E/LT
Microchip Technology
-
MCP4017T-103E/LT
Microchip Technology
-
MCP4531T-103E/MF
Microchip Technology
-
MCP4021T-202E/SN
Microchip Technology
-
MCP4023T-103E/CH
Microchip Technology
-
MCP4022T-503E/CH
Microchip Technology
-
MCP4551T-502E/MS
Microchip Technology
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