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Analog Devices Inc./Maxim Integrated MAX5434PEZT+T
- Part No.:
- MAX5434PEZT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Potentiometers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MAX5434PEZT+T.pdf
- Description:
- IC DGTL POT 32POS 50K SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,513
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Product details
Overview
MAX5434PEZT+T from Maxim Integrated is a 32-tap, nonvolatile, I²C-compatible digital potentiometer in a 6-pin thin SOT23 package, configured as a variable resistor (H internally connected to W), with 50kΩ end-to-end resistance, ±0.15 LSB typical INL/DNL, and 35ppm/°C end-to-end temperature coefficient. It replaces mechanical potentiometers in LCD contrast control and programmable gain amplifier circuits.
For engineers reviewing the MAX5434PEZT+T datasheet, MAX5434PEZT+T pinout, MAX5434PEZT+T application, or MAX5434PEZT+T equivalent, this page delivers verified electrical specs, I²C timing compliance (400kbps), power-on wiper recall behavior, thermal drift performance, and real-world interface constraints including SDA pullup requirements and A0 address configuration limits.
Technical Context
The MAX5434PEZT+T implements a 31-element resistor ladder with wiper controlled via a 5-bit I²C command register, supporting volatile updates and nonvolatile store cycles (200,000 writes, 50-year data retention). Its internal architecture integrates EEPROM, POR circuitry, and an I²C slave interface with fixed 7-bit address 0101000 (A2–A0 = 100) and NOP/W bit handling.
As a variable-resistor topology (H→W shorted), it operates with only three active terminals (W, L, VDD/GND), eliminating voltage-divider mode use cases. It supports single-supply operation from +2.7V to +5.25V, draws 0.5µA standby current, and exhibits 500nA typical static supply current - optimized for low-power embedded biasing and trimming functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resistance Value | 50kΩ end-to-end; enables precise gain/offset adjustment in 5V analog signal chains without external scaling resistors. |
| Tap Resolution | 32 taps (5-bit control); provides ~1.56% step resolution for fine-grained analog tuning in LCD bias or filter cutoff applications. |
| I²C Speed | 400kbps fast-mode compatible; allows integration into high-speed microcontroller buses without timing bottlenecks or added protocol overhead. |
| Tempco (End-to-End) | 35ppm/°C; ensures <±0.3% resistance drift over –40°C to +85°C, critical for stable reference generation in industrial environments. |
| INL / DNL | ±0.15 LSB typical; guarantees monotonicity and predictable transfer function across all 32 positions in variable-resistor mode. |
| Supply Range | +2.7V to +5.25V; interoperable with both 3.3V and 5V logic systems without level-shifting circuitry. |
| Standby Current | 0.5µA typical; reduces system-level quiescent power in battery-powered devices such as portable displays or sensor nodes. |
Pinout & Package
Package: 6-pin thin SOT23 (Z6-1), 2.9mm × 1.6mm × 0.95mm body, exposed pad not present (unlike TDFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - H | High terminal (internally tied to W) | Fixed connection to wiper; used only for voltage sourcing - no independent access; simplifies PCB routing for 2-terminal resistor emulation. |
| 2 - VDD | Power supply input | Must be bypassed with 0.1µF ceramic capacitor to GND; powers internal EEPROM, I²C interface, and resistor array logic. |
| 3 - SCL | I²C clock input | Active-low, open-drain compatible; requires external 4.7kΩ pullup; synchronizes all command/data transfers from master controller. |
| 4 - GND | Ground reference | Primary return path for supply current and wiper current; must be low-impedance to minimize noise coupling into analog outputs. |
| 5 - SDA | I²C data bidirectional line | Open-drain output/input; requires 4.7kΩ pullup; carries address, command, and data bytes; ACK/NACK signaling occurs here. |
| 6 - L | Low terminal | Connects to GND or negative reference; forms adjustable resistance path with W; maximum continuous current ±1.3mA. |
Key Features
| Feature | Design Value |
|---|---|
| Nonvolatile wiper recall | Automatically restores last stored tap position at power-up using on-chip EEPROM - eliminates startup calibration in field-deployed equipment. |
| Low ratiometric tempco | 5ppm/°C ratiometric coefficient ensures stable voltage-divider ratio under thermal stress - essential for precision gain-setting amplifiers. |
| Minimal board footprint | 6-pin thin SOT23 package (2.9mm × 1.6mm) saves >60% area vs. 8-pin TDFN; ideal for space-constrained display modules and wearables. |
| I²C address flexibility | Factory-programmed 7-bit address 0101000 (A2–A0 = 100); allows up to three MAX5434 variants on same bus when combined with MAX5434MEZT+T (0101100) and MAX5434NEZT+T (0101010). |
| Fast wiper settling | 0.5µs typical settling time (50kΩ version) enables dynamic reconfiguration in real-time control loops without output glitching. |
Applications
| LCD Contrast Control | Programmable Filter Tuning |
|---|---|
|
Use Scenario: Adjusting bias voltage for monochrome STN or segment LCDs in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Acts as digitally trimmed variable resistor between VDD and GND to set VBIAS; no external op-amp required in basic configurations. Use Value: Enables remote firmware-based contrast calibration without hardware modification; 32-step resolution matches human perceptual thresholds. |
Use Scenario: Dynamically adjusting cutoff frequency and gain of first-order active filters in sensor signal conditioning paths. IC Role / Device Role / Timing Role: Replaces R3 (cutoff) and R2 (gain) in standard op-amp filter topologies; updated via I²C during runtime. Use Value: Eliminates manual trim pots; supports adaptive filtering for varying sensor bandwidths or EMI conditions in industrial IoT nodes. |
| Adjustable Voltage Reference | Low-Drift Programmable-Gain Amplifier |
|
Use Scenario: Setting output voltage of precision shunt references (e.g., MAX6160) in programmable power supplies and calibration equipment. IC Role / Device Role / Timing Role: Functions as R1/R2 feedback divider with wiper controlling VOUT = 1.23V × (1 + R1/R2). Use Value: Achieves 1.23V–4.8V output range with <±0.1% error over temperature due to 5ppm/°C ratiometric stability. |
Use Scenario: Configuring gain of instrumentation amplifiers in data acquisition systems where channel-specific scaling is required. IC Role / Device Role / Timing Role: Sets RG in three-op-amp IA topology; wiper position directly determines gain (G = 1 + 50kΩ/RG). Use Value: Maintains ±0.05% gain accuracy across –40°C to +85°C thanks to 35ppm/°C end-to-end tempco and monotonic tap response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5434MEZT+T | Same 6-pin SOT23 package, 50kΩ, but factory-programmed I²C address 0101100 (A2–A0 = 110). | Supports multi-device I²C bus sharing where distinct addresses are required; identical electrical performance and pinout. | Select when multiple MAX5434 devices share one bus and address collision must be avoided. |
| AD5175BRMZ-50-R7 | 32-tap, 50kΩ, SPI interface (not I²C), 10-lead MSOP package, ±0.5% end-to-end tolerance (vs. MAX5434's ±25%). | Requires SPI host and additional PCB area; lacks power-on recall (volatile-only memory); higher initial resistance tolerance affects absolute accuracy. | Choose only if existing design uses SPI infrastructure and nonvolatile recall is unnecessary; not drop-in compatible. |
Compared with MAX5434MEZT+T, the MAX5434PEZT+T offers identical performance with a different fixed I²C address - enabling direct substitution only in single-device systems. Against AD5175BRMZ-50-R7, it provides guaranteed power-on state recovery, smaller footprint, tighter tempco, and I²C compatibility - making it superior for embedded trimming where reliability and bus simplicity matter.
Availability
MAX5434PEZT+T is available at Aetrix Electronics and suitable for LCD contrast control, programmable filter tuning, adjustable voltage reference generation, and low-drift programmable-gain amplifier designs requiring stable component supply across extended temperature ranges.
Supply support for MAX5434PEZT+T 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, automotive, and communications applications, emphasizing low-power, high-reliability, and small-footprint solutions.
The MAX5432–MAX5435 family was engineered specifically for replacing mechanical potentiometers in space-constrained, thermally demanding systems - delivering nonvolatile memory, I²C simplicity, and low-drift performance in ultra-small packages like the MAX5434PEZT+T.
FAQ
What is the I²C address of the MAX5434PEZT+T?
The MAX5434PEZT+T has a factory-programmed 7-bit I²C slave address of 0101000 (0x28 in hexadecimal), with the 8th bit (NOP/W) determining read/write direction. This address is fixed and cannot be altered by external pins - unlike the MAX5432/MAX5433, it does not use an A0 pin for address selection. The MAX5434PEZT+T is fully compliant with I²C fast-mode timing specifications up to 400kbps.
Does the MAX5434PEZT+T support voltage-divider mode?
No, the MAX5434PEZT+T does not support voltage-divider mode. It is configured exclusively as a variable resistor, with the H terminal internally connected to the W (wiper) terminal. Only three terminals are functional: W/H, L, and GND/VDD. For true 3-terminal voltage-divider operation, the MAX5432LETA+ or MAX5433LETA+ (8-pin TDFN) must be used instead. The MAX5434PEZT+T's architecture intentionally omits independent H access to reduce package size and cost.
How long does nonvolatile store take on the MAX5434PEZT+T?
A nonvolatile store operation on the MAX5434PEZT+T requires a minimum idle time of 12ms after issuing the VREGxNVREG command. During this period, the device is busy programming its EEPROM and will not acknowledge further I²C commands. Attempting to communicate before this timeout expires results in NACK. This 12ms duration is guaranteed across the full –40°C to +85°C operating range and is independent of supply voltage within the 2.7V–5.25V specification.
What is the maximum wiper current rating for the MAX5434PEZT+T?
The MAX5434PEZT+T supports a maximum continuous wiper current of ±1.3mA when used in variable-resistor mode. This rating applies across the full operating temperature range and is validated per Absolute Maximum Ratings. Exceeding ±1.3mA risks irreversible damage to the internal resistor ladder or wiper switch. For applications requiring higher current, external buffer amplifiers must be used - the MAX5434PEZT+T itself is intended for signal-level trimming, not power-level control.
Can the MAX5434PEZT+T operate from a 3.3V supply?
Yes, the MAX5434PEZT+T is fully specified for operation from +2.7V to +5.25V, including standard 3.3V systems. At VDD = 3.3V, all key parameters remain valid: 32-tap resolution, ±0.15 LSB INL/DNL, 400kbps I²C compatibility, and 35ppm/°C end-to-end tempco. Standby current drops to ~0.5µA, and wiper settling time remains ≤0.5µs. No level shifters or external components are needed for 3.3V microcontroller interfacing.
MAX5434PEZT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 32
- Resistance (Ohms):
- 50k
- Interface:
- I2C
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.25V
- Features:
- -
- Tolerance:
- -
- Temperature Coefficient (Typ):
- 35ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TSOT-23-6
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 610
MAX5434PEZT+T FAQ
1.How can I place an order for MAX5434PEZT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5434PEZT+T 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 MAX5434PEZT+T reliable?
The price and inventory of MAX5434PEZT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5434PEZT+T is usually 5 days.
3.What payment methods are accepted for MAX5434PEZT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5434PEZT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5434PEZT+T?
MAX5434PEZT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5434PEZT+T 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 MAX5434PEZT+T?
For technical support, including MAX5434PEZT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5434PEZT+T requirements.
6.How does Aetrix verify that MAX5434PEZT+T is sourced from the original manufacturer or authorized distributors?
All MAX5434PEZT+T 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 MAX5434PEZT+T meets industry standards.
7.What is the process for return or replacement of MAX5434PEZT+T?
All MAX5434PEZT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5434PEZT+T, 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 MAX5434PEZT+T part is unused and in its original packaging.
Return procedure for MAX5434PEZT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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