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Renesas ISL23425UFVZ-T7A
- Part No.:
- ISL23425UFVZ-T7A
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ISL23425UFVZ-T7A.pdf
- Description:
- IC DGT POT 50KOHM 256TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
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Product details
Overview
ISL23425UFVZ-T7A from Renesas Electronics (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer (DCP) with SPI interface, 50kΩ total resistance per channel, 1.7V–5.5V analog supply (VCC), and independent 1.2V–5.5V logic supply (VLOGIC). It delivers ±0.15 LSB integral nonlinearity in voltage divider mode and operates across –40°C to +125°C for trimming sensor circuits and gain adjustment in battery-powered instruments.
For engineers reviewing the ISL23425UFVZ-T7A datasheet, ISL23425UFVZ-T7A pinout, ISL23425UFVZ-T7A application, or ISL23425UFVZ-T7A equivalent, key selection criteria include dual-channel wiper register control, shutdown-mode open-circuit isolation, low 1.7µA standby current at 1.7V/1.2V, and compatibility with 1.2V microcontroller buses without level shifting.
Technical Context
The ISL23425UFVZ-T7A integrates two independent DCP cores on a monolithic CMOS IC, each with an 8-bit volatile Wiper Register (WR0/WR1) directly accessible via SPI Mode 0. Wiper positioning uses make-before-break CMOS switches across 256 resistor taps, ensuring monotonicity and glitch-free transitions.
It supports dual-supply operation: VCC powers analog DCP terminals (RH/RL/RW), while VLOGIC independently supplies SPI logic (SCK/SDI/SDO/CS), enabling direct interfacing with 1.2V controllers. Shutdown mode disconnects DCP resistors and internally shorts RW to RL via 2kΩ, reducing system power leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance | 50kΩ per channel - sets full-scale range for voltage division or rheostat use in precision biasing. |
| Resolution | 256 taps (8-bit) - enables 0.39% step resolution for fine-grained analog tuning. |
| VCC Range | 1.7V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V systems without external regulators. |
| VLOGIC Range | 1.2V to 5.5V - eliminates need for level shifters when interfacing with ultra-low-voltage MCUs. |
| Standby Current | 1.7µA @ VCC/VLOGIC = 1.7V - extends battery life in always-on sensor nodes. |
| INL (Voltage Divider) | ±0.15 LSB (typ) - ensures <0.06% linearity error over full tap range for accurate calibration. |
| Wiper Resistance | 70Ω typ @ 3.3V - minimizes insertion loss and signal distortion in AC-coupled paths. |
| Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments. |
Pinout & Package
ISL23425UFVZ-T7A is packaged in a 14-lead TSSOP (M14.173), RoHS-compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 7) | Common analog/digital ground reference | Must be tied to system ground plane; separates noise-sensitive DCP analog return from digital logic return. |
| VLOGIC (Pin 2) | Digital logic supply input | Directly powers SPI interface; sets VIH/VIL thresholds and enables 1.2V bus compatibility. |
| SDO (Pin 3) | SPI serial data output | Push-pull by default; configurable as open-drain for wired-OR bus sharing; tri-stated when CS = high. |
| SCK (Pin 4) | SPI clock input | Rising-edge sampled input; supports up to 5MHz (≥1.7V) or 1MHz (1.2–1.6V) for timing-critical updates. |
| SDI (Pin 5) | SPI serial data input | Accepts instruction + data bytes; MSB-first protocol with no parity or stop bits required. |
| CS (Pin 6) | Active-low chip select | Enables device communication; rising edge triggers wiper settling and recall from shutdown. |
| RL1 (Pin 8) | DCP1 low terminal | Fixed end of second potentiometer array; used as reference node in voltage divider or rheostat configurations. |
| RW1 (Pin 9) | DCP1 wiper terminal | Movable contact position set by WR1 register; connects to feedback path in amplifier gain networks. |
| RH1 (Pin 10) | DCP1 high terminal | Fixed end of second potentiometer array; typically tied to VCC or reference voltage. |
| RH0 (Pin 11) | DCP0 high terminal | Fixed end of first potentiometer array; shares VCC rail with RH1 unless isolated for dual-rail operation. |
| RW0 (Pin 12) | DCP0 wiper terminal | Movable contact position set by WR0 register; commonly used for offset nulling in instrumentation amplifiers. |
| RL0 (Pin 13) | DCP0 low terminal | Fixed end of first potentiometer array; often grounded or biased to define adjustable threshold. |
| VCC (Pin 14) | Analog power supply | Powers resistor array and wiper switches; must remain ≥ VLOGIC and within 1.7–5.5V for valid DCP terminal voltage range. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 256-tap DCPs | Enables simultaneous calibration of two independent analog paths (e.g., differential sensor front-end or dual-channel DAC reference). |
| Volatile wiper registers (WR0/WR1) | Allows dynamic real-time adjustment via SPI without nonvolatile memory wear-out or write latency penalties. |
| Independent VLOGIC supply | Permits direct connection to 1.2V I/O domains of modern ultra-low-power MCUs, eliminating discrete level shifters and BOM cost. |
| Shutdown mode with RW-to-RL short | Reduces system leakage by forcing open-circuit between RH and RL while maintaining wiper position for instant restore. |
| Power-on reset to mid-scale (128) | Guarantees known startup state (50% resistance) for predictable biasing before host firmware initialization. |
| –40°C to +125°C operation | Validates performance in harsh environments such as automotive engine control units and industrial PLC analog I/O modules. |
Applications
| Power Supply Margining | Trimming Sensor Circuits |
|---|---|
Use Scenario: Adjusting output voltage of DC-DC converters during production test to meet tight tolerance bands. IC Role / Device Role / Timing Role: Dual-channel DCP acts as programmable feedback divider, replacing manual trim pots for automated calibration. Use Value: Enables software-controlled margin testing at ±3% VOUT without hardware changes or rework. | Use Scenario: Compensating offset and gain drift in temperature or pressure sensor signal chains. IC Role / Device Role / Timing Role: ISL23425UFVZ-T7A provides matched, temperature-stable resistance adjustment for op-amp feedback networks. Use Value: Achieves <±0.5°C accuracy in RTD-based thermometers using factory-calibrated WR0/WR1 values stored in host MCU EEPROM. |
| Gain Adjustment in Battery Powered Instruments | RF Power Amplifier Bias Compensation |
Use Scenario: Dynamically scaling transimpedance gain in portable optical pulse oximeters based on ambient light conditions. IC Role / Device Role / Timing Role: Configured as rheostat between op-amp output and inverting input to adjust feedback resistance. Use Value: Extends battery runtime by reducing gain (and thus current draw) in bright environments while preserving SNR in low-light modes. | Use Scenario: Maintaining stable quiescent current in GaAs RF PAs across temperature and process variation. IC Role / Device Role / Timing Role: ISL23425UFVZ-T7A sets bias voltage at PA driver stage using voltage divider configuration with low feed-through noise. Use Value: Reduces EVM degradation by >1.5% through active compensation of thermal drift in bias network resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRUZ100 | 100kΩ total resistance; I²C interface; no independent VLOGIC pin; 2.7–5.5V single supply only. | Lacks 1.2V bus compatibility and dual-supply flexibility; requires level shifter for sub-2.7V controllers. | Select when I²C is preferred and VLOGIC independence is unnecessary; verify INL (±0.5 LSB) meets system linearity requirements. |
| MCP42050-I/P | 50kΩ total resistance; SPI interface; single 2.7–5.5V supply; no shutdown mode; 0°C to +70°C temp range. | Not rated for extended industrial temperatures; missing RW-to-RL short in shutdown, limiting leakage reduction. | Choose for cost-sensitive commercial applications where –40°C to +125°C operation and low-leakage shutdown are not required. |
Compared with AD5242BRUZ100 and MCP42050-I/P, the ISL23425UFVZ-T7A uniquely supports 1.2V logic interfacing, guaranteed –40°C to +125°C operation, and hardware-enforced shutdown isolation-critical for automotive and industrial embedded systems requiring robustness and ultra-low standby power.
Availability
ISL23425UFVZ-T7A is available at Aetrix Electronics and suitable for power supply margining, trimming sensor circuits, and gain adjustment in battery powered instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL23425UFVZ-T7A 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The ISL23425UFVZ-T7A belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for precision analog trimming and calibration in space-constrained, low-power, and high-reliability systems.
FAQ
What is the total resistance value specified for the ISL23425UFVZ-T7A?
The ISL23425UFVZ-T7A is configured with a nominal total resistance of 50kΩ per channel (RH0–RL0 and RH1–RL1). This value is fixed at manufacture and confirmed in the Ordering Information table of FN7873 Rev 1.00. Tolerance is ±2%, and end-to-end temperature coefficient is 65 ppm/°C over –40°C to +125°C.
Does the ISL23425UFVZ-T7A retain wiper settings after power cycling?
No, the ISL23425UFVZ-T7A uses volatile wiper registers (WR0 and WR1). Upon power-up, both wipers reset to mid-scale (128 decimal / 0x80), regardless of prior state. Host firmware must reprogram WR0/WR1 after initialization to restore desired positions.
Can the ISL23425UFVZ-T7A operate with a 1.2V microcontroller SPI bus without external level shifting?
Yes. The ISL23425UFVZ-T7A features a dedicated VLOGIC pin supporting 1.2V to 5.5V, allowing direct connection to 1.2V I/O domains. Input thresholds scale with VLOGIC (VIH = 0.7×VLOGIC), and SDO output is push-pull by default-no level shifter required.
What happens to the DCP terminals during shutdown mode of the ISL23425UFVZ-T7A?
When the SHDN bit (ACR[6]) is cleared, the ISL23425UFVZ-T7A forces each DCP into end-to-end open circuit (RH–RL disconnected) and internally connects each RW terminal to its corresponding RL terminal via a 2kΩ resistor. This minimizes leakage while preserving wiper register contents for fast restore.
Is the ISL23425UFVZ-T7A pin-compatible with other variants in the ISL23425 family?
Yes, all ISL23425 variants-including ISL23425TFVZ, ISL23425WFVZ, and ISL23425UFVZ-share identical 14-lead TSSOP pinout and function mapping. Resistance value (10kΩ/50kΩ/100kΩ) and marking differ, but PCB layout and firmware interface remain unchanged across variants.
ISL23425UFVZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 2
- Number of Taps:
- 256
- Resistance (Ohms):
- 50k
- Interface:
- SPI
- Memory Type:
- Volatile
- Voltage - Supply:
- 1.2V ~ 5.5V, 1.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 65ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL23425UFVZ-T7A FAQ
1.How can I place an order for ISL23425UFVZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL23425UFVZ-T7A 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 ISL23425UFVZ-T7A reliable?
The price and inventory of ISL23425UFVZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL23425UFVZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL23425UFVZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL23425UFVZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL23425UFVZ-T7A?
ISL23425UFVZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL23425UFVZ-T7A 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 ISL23425UFVZ-T7A?
For technical support, including ISL23425UFVZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL23425UFVZ-T7A requirements.
6.How does Aetrix verify that ISL23425UFVZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL23425UFVZ-T7A 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 ISL23425UFVZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL23425UFVZ-T7A?
All ISL23425UFVZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL23425UFVZ-T7A, 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 ISL23425UFVZ-T7A part is unused and in its original packaging.
Return procedure for ISL23425UFVZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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