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Renesas ISL5121IBZ-T
- Part No.:
- ISL5121IBZ-T
- Manufacturer:
- Renesas
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL5121IBZ-T.pdf
- Description:
- IC SWITCH SPST-NCX2 20OHM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,643
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Product details
Overview
ISL5121IBZ-T from Intersil is a dual SPST analog switch with normally closed (NC/NC) configuration, operating from a single +2.7V to +12V supply. It delivers 19Ω ON-resistance at 5V, 28ns turn-on time, <5µW power consumption, and 10nA leakage current - enabling precision signal routing in space-constrained, battery-powered systems such as cellular handsets and portable medical devices.
For engineers reviewing the ISL5121IBZ-T datasheet, ISL5121IBZ-T pinout, ISL5121IBZ-T application, or ISL5121IBZ-T equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts for design continuity amid end-of-life status.
Technical Context
The ISL5121IBZ-T implements dual independent CMOS transmission gates with NC/NC topology, each controlled by a TTL/CMOS-compatible digital input. Its internal level shifter ensures reliable switching across 3.3V, 5V, and 12V supplies without external biasing.
It features matched rON ≤1Ω between channels, 5pC max charge injection, and guaranteed break-before-make timing only in ISL5122/ISL5123 variants - not applicable to ISL5121IBZ-T. ESD protection exceeds 2000V per MIL-STD-883 Method 3015.7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Type | Dual SPST, normally closed (NC/NC) - both switches conduct when logic input is low |
| Supply Range | +2.7V to +12V single supply - supports wide-battery and industrial rail compatibility |
| rON @ 5V | 19Ω typical - enables low insertion loss in audio, sensor, and DAC/ADC signal paths |
| tON / tOFF | 28ns / 20ns @ 5V - suitable for high-speed multiplexing up to ~15MHz analog bandwidth |
| Leakage Current | 10nA max @ 25°C - preserves accuracy in high-impedance sample-and-hold or integrator reset circuits |
| Charge Injection | 5pC max - minimizes voltage glitch on switched capacitor nodes during state transitions |
| ESD Rating | >2000V HBM - robust handling in manual assembly and field-replaceable modules |
Pinout & Package
ISL5121IBZ-T is housed in an 8-lead SOIC package (RoHS-compliant, M8.15 drawing), rated for -40°C to +85°C operation. Pinout validated per FN6022 Rev 8.00, Page 2 top-view diagram for ISL5121 (SOIC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply input | Establishes analog signal range (0V to V+) and powers internal CMOS switches and level shifters |
| GND | Ground reference | Return path for supply current and analog signal common; must be low-impedance for noise control |
| IN1, IN2 | Digital control inputs | TTL/CMOS-compatible (VINL ≤0.8V, VINH ≥2.4V); active-low logic controls NC switch closure |
| COM1, COM2 | Analog common terminals | Input/output bidirectional nodes - connected to load or source depending on signal direction |
| NC1, NC2 | Analog normally closed terminals | Conduct to respective COM pin when IN = low; open when IN = high - defines default-closed behavior |
Key Features
| Feature | Design Value |
|---|---|
| Dual NC/NC topology | Ensures fail-safe closed-path operation during power-up or logic fault - critical for safety-critical signal monitoring |
| 19Ω rON matching ≤1Ω | Enables precise channel-to-channel gain tracking in dual-path instrumentation amplifiers or balanced ADC front-ends |
| 5pC max charge injection | Reduces settling error in precision sampling systems - avoids post-switching correction in µV-level measurements |
| Single-supply +2.7V–+12V | Eliminates need for dual-rail supplies in portable designs - simplifies power architecture and reduces BOM count |
| Pb-free RoHS compliance | Meets global environmental regulations and qualifies for lead-free reflow (J-STD-020 Level 1) |
Applications
| Cellular Handset Signal Routing | Portable Medical Sensor Interface |
|---|---|
Use Scenario: Routing analog microphone or earpiece signals between baseband ASIC and external peripherals in space-limited smartphone PCBs. IC Role / Device Role / Timing Role: Dual NC/NC analog switch providing default-connected audio path until firmware configures alternate routing. Use Value: Eliminates need for external pull-up resistors or latching logic; 19Ω rON preserves SNR in 20kHz audio band. |
Use Scenario: Connecting disposable ECG electrodes to a low-power ADC in handheld electrocardiograph units. IC Role / Device Role / Timing Role: Isolating unused electrode inputs while maintaining low-leakage (<10nA) bias paths for signal integrity. Use Value: Prevents DC offset drift in high-gain front-end; 28ns switching allows rapid channel scanning at 1kSPS. |
| Industrial DAC Output Multiplexing | Test Equipment Channel Selection |
Use Scenario: Selecting between multiple calibrated voltage references for programmable gain stages in industrial PLC analog outputs. IC Role / Device Role / Timing Role: Precision SPST switch enabling rON-matched signal path selection without introducing gain error. Use Value: 1Ω rON matching ensures ≤0.05% gain mismatch across channels - meets Class A calibration requirements. |
Use Scenario: Automated channel routing in benchtop ultrasound signal generators requiring sub-30ns path reconfiguration. IC Role / Device Role / Timing Role: High-speed analog switch supporting multi-channel pulse waveform sequencing with minimal inter-channel crosstalk. Use Value: -105dB crosstalk and 76dB off-isolation maintain signal fidelity in 1–10MHz diagnostic waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL5120IHZ-T | Same family, dual NO/NO topology; identical 8-lead SOT-23 package, 19Ω rON, 28ns tON | Requires inverted control logic (conducts on logic high); unsuitable where fail-closed behavior is mandatory | Select when default-open state is acceptable and board layout accommodates SOT-23 footprint |
| ISL5121IHZ-T | Identical NC/NC functionality and electrical specs; differs only in 8-lead SOT-23 package (P8.064) vs SOIC (M8.15) | Same functional behavior but smaller footprint - requires PCB redesign for thermal and routing constraints | Choose for space-constrained designs where SOIC solder joint reliability is less critical than board area |
Compared with ISL5121IBZ-T, ISL5120IHZ-T changes default state from closed to open and shifts package from SOIC to SOT-23, while ISL5121IHZ-T retains identical NC/NC behavior but demands SOT-23 layout adaptation - both require validation of thermal performance under 30mA continuous load.
Availability
ISL5121IBZ-T is available at Aetrix Electronics and suitable for cellular handset signal routing, portable medical sensor interfaces, industrial DAC output multiplexing, and test equipment channel selection requiring stable component supply despite end-of-life status.
Supply support for ISL5121IBZ-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
Intersil Corporation is a semiconductor manufacturer specializing in precision analog and power management ICs, now part of Renesas Electronics since 2017.
The ISL5121IBZ-T belongs to the ISL512x dual analog switch product line, engineered for low-voltage, low-power, high-fidelity signal routing in battery-operated and portable electronic systems.
FAQ
What is the operating temperature range for the ISL5121IBZ-T?
The ISL5121IBZ-T is specified for operation from -40°C to +85°C, as indicated by the "I" grade suffix in its ordering code. This industrial temperature range ensures reliable performance in automotive cabin modules, industrial handhelds, and outdoor medical devices where ambient conditions exceed commercial limits.
Is the ISL5121IBZ-T pin-compatible with ISL5120IBZ-T?
No, the ISL5121IBZ-T is not pin-compatible with ISL5120IBZ-T in function despite identical SOIC-8 packaging and pinout. While both share the same physical pin assignments, ISL5120IBZ-T implements NO/NO switches (conduct on logic high), whereas ISL5121IBZ-T uses NC/NC switches (conduct on logic low) - requiring complementary control logic inversion.
Does the ISL5121IBZ-T support 3.3V logic control with a 12V analog supply?
Yes, the ISL5121IBZ-T supports mixed-voltage operation: digital inputs accept TTL/CMOS levels (VINL ≤0.8V, VINH ≥2.4V) independent of V+, enabling 3.3V microcontroller control even when V+ is set to 12V for wider analog signal swing - confirmed in Electrical Specifications tables for 12V supply.
What is the maximum analog signal voltage the ISL5121IBZ-T can switch?
The ISL5121IBZ-T supports analog signals from 0V to V+ (e.g., 0V to 12V when V+ = 12V), as defined by its Analog Signal Range (VANALOG) specification. Signals exceeding V+ or falling below GND are clamped by internal ESD diodes - limiting safe operation to within the supply rails unless external protection is added.
Why was the ISL5121IBZ-T discontinued, and what is the recommended replacement?
The ISL5121IBZ-T was discontinued per Intersil's ordering information table (FN6022 Rev 8.00, Page 3), with ISL5120IHZ-T listed as the recommended replacement. This reflects a strategic shift toward SOT-23 packaging and NO/NO topology - though functional equivalence requires logic inversion and package adaptation, not drop-in substitution.
ISL5121IBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NC
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 20Ohm
- Channel-to-Channel Matching (ΔRon):
- 800mOhm
- Voltage - Supply, Single (V+):
- 2.7V ~ 12V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 35ns, 30ns
- -3db Bandwidth:
- -
- Charge Injection:
- 5pC
- Channel Capacitance (CS(off), CD(off)):
- 8pF, 8pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -105dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL5121IBZ-T FAQ
1.How can I place an order for ISL5121IBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL5121IBZ-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 ISL5121IBZ-T reliable?
The price and inventory of ISL5121IBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL5121IBZ-T is usually 5 days.
3.What payment methods are accepted for ISL5121IBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL5121IBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL5121IBZ-T?
ISL5121IBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL5121IBZ-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 ISL5121IBZ-T?
For technical support, including ISL5121IBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL5121IBZ-T requirements.
6.How does Aetrix verify that ISL5121IBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL5121IBZ-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 ISL5121IBZ-T meets industry standards.
7.What is the process for return or replacement of ISL5121IBZ-T?
All ISL5121IBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL5121IBZ-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 ISL5121IBZ-T part is unused and in its original packaging.
Return procedure for ISL5121IBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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