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Renesas ISL43231IR
- Part No.:
- ISL43231IR
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL43231IR.pdf
- Description:
- IC SWITCH SPDT X 3 50OHM 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,795
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Product details
Overview
ISL43231IR from Intersil is a low-voltage, triple SPDT analog switch designed for precision signal routing in single-supply (+2V to +12V) or dual-supply (±2V to ±6V) systems. It delivers 39Ω ON resistance at ±5V, 38ns/19ns enable switching times, rail-to-rail analog signal handling, and guaranteed break-before-make operation - enabling high-fidelity multiplexing in medical ultrasound front-ends and portable instrumentation.
For engineers reviewing the ISL43231IR datasheet, ISL43231IR pinout, ISL43231IR application, or ISL43231IR equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional trade-offs for 2:1 analog multiplexer designs.
Technical Context
The ISL43231IR implements three independent SPDT switches controlled via three address inputs (ADDA, ADDB, ADDC), with separate EN/EN̅ inhibit logic to simultaneously disable all paths and LE latch logic to hold the last selected channel state. Its CMOS transmission-gate architecture supports bidirectional analog signals across the full supply rail range.
It features dual digital control domains: one for global enable/inhibit (EN/EN̅ referenced to V+ and GND), and another for latching (LE referenced to V+), ensuring deterministic switching behavior under noisy or asynchronous control conditions. All digital inputs meet TTL/CMOS thresholds (0.8V/2.4V) across 2.7V–10V V+ operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Configuration | Triple SPDT - enables simultaneous 2:1 selection across three independent analog channels. |
| ON Resistance (RON) | 39Ω max at ±5V - ensures minimal signal attenuation and gain error in precision ADC/DAC interfaces. |
| Switching Speed | tON/tOFF = 38ns/19ns at ±5V - supports high-speed multiplexing in >10 MSPS data acquisition systems. |
| Leakage Current | 2.5nA max at +85°C - preserves accuracy in high-impedance sensor front-ends and integrator reset circuits. |
| Supply Range | +2V to +12V single or ±2V to ±6V dual - accommodates legacy ±5V rails and modern 3.3V/5V portable systems. |
| Charge Injection | 1pC max at ±5V - minimizes voltage glitch in sample-and-hold and switched-capacitor applications. |
| Off Isolation | 92dB at 100kHz - suppresses crosstalk between active and inactive signal paths in multi-channel routing. |
Pinout & Package
ISL43231IR is housed in a 20-lead 4×4 mm QFN package (PKG DWG # L20.4x4) with exposed thermal pad. Pin 1 is top-left corner (NOA), and pin 20 is bottom-right (ADDB). The package supports reflow soldering per IPC/JEDEC J-STD-020 MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NOA, NOB, NOC | Analog Normally Open terminal (per switch A/B/C) | Connects to COM when switch is activated; used for primary signal path selection. |
| NCA, NCB, NCC | Analog Normally Closed terminal (per switch A/B/C) | Connects to COM when switch is inactive; enables default-path fail-safe routing. |
| COMA, COMB, COMC | Analog common terminal (per switch A/B/C) | Shared I/O node for each SPDT; must be connected to system signal source or load. |
| ADDA, ADDB, ADDC | Digital address input (binary-encoded channel select) | 3-bit code selects one of eight possible switch states (including all-off and latched modes). |
| EN, EN̅ | Global inhibit enable/disable pair | Active-low EN and active-high EN̅ allow flexible logic-level control to open all paths simultaneously. |
| LE | Latch enable input | When asserted, freezes current switch state regardless of subsequent address changes. |
| V+, V−, GND | Power supply terminals | V+ and V− power analog switches and define signal swing limits; GND serves digital logic reference only. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog signal handling | Supports full V− to V+ input/output swing - eliminates clipping in ±5V op-amp gain-switching networks. |
| Guaranteed break-before-make | Minimum 2ns tBBM ensures no signal shorting during channel transitions - critical for protecting sensitive sources. |
| Low charge injection (1pC) | Reduces settling error in precision sample-and-hold circuits - enables sub-16-bit accuracy retention. |
| TTL/CMOS logic compatibility | 0.8V/2.4V thresholds work directly with 3.3V and 5V microcontrollers - no level-shifting required. |
| Thermal performance (θJA = 45°C/W) | Enables sustained operation at 85°C ambient without derating - suitable for enclosed medical enclosures. |
Applications
| Medical Ultrasound Front-End | Portable Data Acquisition System |
|---|---|
Use Scenario: Multiplexing 16-channel echo return signals from transducer array into a shared ADC pipeline. IC Role / Device Role / Timing Role: Triple SPDT switch routes individual channel outputs to common analog signal chain while maintaining phase coherence and low noise floor. Use Value: 39Ω RON and 92dB off-isolation preserve SNR across 1–15 MHz bandwidth; 38ns switching enables real-time beamforming latency. |
Use Scenario: Configurable analog input conditioning for handheld multimeter with selectable voltage/current/resistance ranges. IC Role / Device Role / Timing Role: Enables dynamic reconfiguration of gain-setting resistors and signal path topology under MCU control. Use Value: Single 3.3V supply operation and 125Ω RON at 3.3V support battery-powered portability without sacrificing resolution. |
| Industrial CT Scanner Detector Interface | Audio Signal Routing in Pro Mixing Console |
Use Scenario: Switching between calibration references and detector outputs in X-ray pulse-integration circuitry. IC Role / Device Role / Timing Role: Provides break-before-make isolation during reference injection to prevent detector signal corruption. Use Value: 2.5nA max leakage at +85°C ensures stable baseline in high-temperature gantry environments over extended scan cycles. |
Use Scenario: Dynamic assignment of microphone preamp outputs to channel strips in digital audio workstation hardware. IC Role / Device Role / Timing Role: Routes balanced line-level signals with minimal crosstalk between adjacent channels during live mixing. Use Value: <-110dB crosstalk and <1pC charge injection prevent audible artifacts during fast fader automation or mute transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4683ETE+ | Higher RON (75Ω @ ±5V), no latch function, smaller 16-pin TQFN package | Lacks LE pin and triple SPDT configuration - requires external logic for latched operation | Choose for space-constrained PCBs where latch functionality is unnecessary and 75Ω RON is acceptable |
| TMUX6213RTER | Lower leakage (0.5nA @ 85°C), higher supply range (up to ±16.5V), but slower tON (75ns @ ±5V) | Optimized for high-voltage industrial sensing, not high-speed multiplexing | Choose when ultra-low leakage dominates over speed, e.g., in precision strain gauge or thermocouple front-ends |
Compared with MAX4683ETE+ and TMUX6213RTER, the ISL43231IR uniquely balances low RON, fast switching, latch capability, and broad supply flexibility - making it optimal for portable medical and test equipment requiring deterministic, glitch-free channel selection.
Availability
ISL43231IR is available at Aetrix Electronics and suitable for medical ultrasound front-ends, portable data acquisition systems, and industrial CT scanner detector interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL43231IR 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog and power management ICs for demanding industrial, medical, and communications applications.
The ISL43231IR belongs to Intersil's high-performance analog switch family, engineered specifically for low-distortion, rail-to-rail signal routing in battery-powered and high-reliability instrumentation systems.
FAQ
What supply configurations does the ISL43231IR support?
The ISL43231IR operates from a single +2V to +12V supply (with V− tied to GND) or a dual ±2V to ±6V supply. At ±5V, it achieves 39Ω RON and 38ns/19ns switching; at +3.3V, RON rises to 125Ω with 70ns/32ns timing. The device maintains TTL/CMOS logic compatibility across all supported supplies, and its absolute maximum rating allows up to ±15V differential without damage.
How does the latch function (LE pin) operate in the ISL43231IR?
The LE (Latch Enable) pin on the ISL43231IR freezes the current switch state when driven low. While LE is low, changes to ADDA/ADDB/ADDC inputs have no effect - the selected NO/NC path remains active until LE is returned high. This feature prevents spurious channel switching during address bus contention or slow microcontroller GPIO transitions, ensuring deterministic behavior in noisy industrial environments.
Does the ISL43231IR provide break-before-make switching?
Yes, the ISL43231IR guarantees break-before-make operation with a minimum tBBM of 2ns across the full −40°C to +85°C temperature range. This ensures that the previously selected path fully disconnects before the newly addressed path connects - eliminating momentary shorts that could damage sensitive signal sources or cause transient errors in precision measurement circuits.
What is the maximum analog signal voltage the ISL43231IR can handle?
The ISL43231IR supports rail-to-rail analog signals from V− to V+. With ±5V supplies, this means −5V to +5V; with +12V/V− = GND, it handles 0V to +12V. Input voltages beyond these rails are clamped by internal ESD diodes, but sustained overvoltage risks forward-biasing those diodes - so analog signals must remain within V− and V+ for reliable operation and specified leakage performance.
Can the ISL43231IR be used in high-frequency RF signal routing?
The ISL43231IR is optimized for analog signal routing up to ~100MHz in 50Ω systems, with off-isolation of 92dB at 100kHz and >55dB at 10MHz. However, it is not characterized for RF impedance matching or S-parameter performance. For true RF switching above 100MHz, purpose-built RF switches (e.g., PE4259) are recommended - the ISL43231IR suits baseband, audio, and medium-speed instrumentation signals, not RF carrier frequencies.
ISL43231IR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 3
- On-State Resistance (Max):
- 50Ohm
- Channel-to-Channel Matching (ΔRon):
- 1.3Ohm
- Voltage - Supply, Single (V+):
- 2.7V ~ 12V
- Voltage - Supply, Dual (V±):
- ±2V ~ 6V
- Switch Time (Ton, Toff) (Max):
- 35ns, 22ns (Typ)
- -3db Bandwidth:
- -
- Charge Injection:
- 0.3pC
- Channel Capacitance (CS(off), CD(off)):
- 3pF, 9pF
- Current - Leakage (IS(off)) (Max):
- 2pA (Typ)
- Crosstalk:
- -110dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
ISL43231IR FAQ
1.How can I place an order for ISL43231IR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL43231IR 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 ISL43231IR reliable?
The price and inventory of ISL43231IR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL43231IR is usually 5 days.
3.What payment methods are accepted for ISL43231IR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL43231IR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL43231IR?
ISL43231IR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL43231IR 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 ISL43231IR?
For technical support, including ISL43231IR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL43231IR requirements.
6.How does Aetrix verify that ISL43231IR is sourced from the original manufacturer or authorized distributors?
All ISL43231IR 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 ISL43231IR meets industry standards.
7.What is the process for return or replacement of ISL43231IR?
All ISL43231IR units undergo pre-shipment inspection (PSI). If there is an issue with ISL43231IR, 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 ISL43231IR part is unused and in its original packaging.
Return procedure for ISL43231IR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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