ISL84521IB - 100Ω Quad SPST Analog Switch | Renesas
Teilenummer: ISL84521IB ✓ AktivISL84521IB Übersicht
An analog switch is an integrated interface circuit that connects or disconnects a signal path under digital control. A single-pole single-throw switch provides one independently selectable route, while a quad analog switch combines four such switches in one IC. The ISL84521 belongs to the analog-switch, interface-IC, and semiconductor hierarchy and can serve as a low-voltage multiplexing or sampling element in test, measurement, communication, and industrial control systems.
Key features include four separately controlled SPST switches, a 100Ω maximum on-resistance, channel matching of 1Ω, 1µW low power consumption, and 10nA maximum leakage current at 85°C. Switching timing is specified as 45ns typical turn-on and 15ns typical turn-off, while break-before-make operation helps prevent undesirable current paths during transitions.
The ISL84521 supports single-supply operation from 3V to 12V and dual-supply operation from ±3V to ±6V. Its CMOS implementation supports TTL-compatible control inputs and low power consumption. Four independent controls allow separate signals to be routed without requiring multiple single-switch packages, reducing board area in multi-channel analog systems.
Typical uses include battery-powered test equipment, programmable signal conditioning, communication-interface routing, industrial control modules, and precision measurement systems. The low 15ns typical turn-off time is useful when the application requires rapid isolation or discharge paths, while the 100Ω maximum on-resistance should be considered in high-impedance analog nodes.
For layout, place each switched signal trace close to its assigned switch pin and keep control traces away from sensitive analog paths. Confirm input and output voltage limits against the selected supply configuration. Account for the 100Ω maximum channel resistance, 1Ω matching specification, and leakage when calculating circuit errors.
This page combines manufacturer specifications, package details, application guidance, and a focused replacement analysis. It also identifies the limits of drop-in substitution by separating same-footprint options from parts requiring a different package, helping engineers shorten sourcing and design-review time.
Drop-in-Alternativen für ISL84521IB – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
ISL84521IB-T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ISL84521IB Grenzwerte & elektrische Eigenschaften
| Number of Switches | 4 |
| Switch Configuration | 4 × SPST |
| Control Type | 4 separately controlled switches |
| Maximum On-Resistance | 100Ω |
| On-Resistance Matching Between Channels | 1Ω |
| Low Power Consumption | 1µW |
| Maximum Leakage Current | 10nA at 85°C |
| Typical Turn-On Time | 45ns |
| Typical Turn-Off Time | 15ns |
| Single-Supply Operating Range | 3V to 12V |
| Dual-Supply Operating Range | ±3V to ±6V |
| ESD Protection | 2000V minimum |
| Control Interface Compatibility | TTL and CMOS compatible |
| Switching Behavior | Break-before-make |
| Process Technology | CMOS |
| Gehäuse | 16-pin SOIC, 3.90mm width |
| Montageart | Surface mount |
| Lead-Free Status | Pb-free |
ISL84521IB 16-pin soic, 3.90mm width Pinbelegungsleitfaden
Pinbelegung für ISL84521IB (16-pin soic, 3.90mm width-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für ISL84521IB.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ISL84521IB ist geeignet für 6 Anwendungs: Battery-Powered Test and Measurement, Programmable Signal Conditioning, Communication Interface Routing, Industrial Control Signal Isolation, Precision Measurement Front Ends, Data Acquisition and Sample Routing.
Battery-Powered Test and Measurement
The ISL84521IB fits portable measurement systems that route several low-level signals through a compact analog front end. Its 3V minimum single-supply operation supports battery-powered designs, while the four independently controlled SPST switches can connect a common source to separate channels. The 1µW low-power condition and 10nA maximum leakage at 85°C help limit the influence of the switching network on battery life and high-impedance readings. The 100Ω maximum on-resistance should be included in the source impedance and error budget, especially when measuring resistive sensors. Designers must also preserve the 45ns typical turn-on and 15ns typical turn-off timing when coordinating acquisition sequences.
Empfohlen
Programmable Signal Conditioning
The ISL84521IB is useful in programmable analog front ends where individual sensor, reference, or feedback paths must be selected under digital control. Four separate SPST switches reduce the number of discrete switch packages needed for modest channel counts. Its 1Ω on-resistance matching between channels helps maintain consistent path resistance when several inputs feed identical downstream circuitry. The 15ns typical turn-off time allows rapid disconnection of a previous path, while break-before-make operation reduces unwanted overlap during switching. Because maximum on-resistance is 100Ω, the device is best matched to medium- and high-impedance nodes rather than precision low-ohm routing. Input range, control thresholds, and leakage must be checked against the selected amplifier or converter.
Empfohlen
Communication Interface Routing
The ISL84521IB can route control or low-speed communication signals in compact interface modules because it provides four independently addressed SPST paths in one 16-pin SOIC. TTL- and CMOS-compatible control inputs simplify connection with common digital controllers, while single- and dual-supply flexibility supports legacy and newer rail arrangements. The 45ns typical turn-on and 15ns typical turn-off times are suitable for many control and packet-routing functions, although high-speed data interfaces require separate signal-integrity analysis. The 100Ω maximum on-resistance may affect impedance-sensitive edges and should be included in termination and loading calculations. Engineers should verify the complete input/output voltage limits against the communications rail and ensure the switched path never exposes a control pin to an out-of-range voltage.
Empfohlen
Industrial Control Signal Isolation
The ISL84521IB provides low-leakage signal isolation between industrial control channels and sensitive analog sections. Its maximum leakage current of 10nA at 85°C is important when the switched node has a high source impedance, because leakage can create an offset or disturb a stored charge. The break-before-make characteristic helps prevent two paths from being connected simultaneously during a transition, reducing contention risk in multiplexed control systems. The 100Ω on-resistance is suitable for many control and sensor-routing networks but may require a follow-on amplifier for very high impedance nodes. Designers should account for the 45ns turn-on delay in timing diagrams and verify that all control signals remain within the selected supply and logic thresholds.
Empfohlen
Precision Measurement Front Ends
The ISL84521IB can serve as a compact switching element in precision measurement front ends where several inputs must be presented to a common amplifier or converter. The 1Ω matching specification between on-resistances improves consistency when channel resistance itself contributes to measurement error. Its 10nA maximum leakage at 85°C limits unintended coupling into high-impedance sensors and charge-sensitive nodes. The 15ns typical turn-off time supports fast isolation between conversions, although charge injection and transient settling must be evaluated for each source impedance. Because the maximum on-resistance is 100Ω, gain and offset calculations should include the complete switch path rather than treating it as an ideal conductor. Grounding and return-current layout remain essential for preserving the front end’s measurement accuracy.
Empfohlen
Data Acquisition and Sample Routing
The ISL84521IB is suitable for small multi-channel data-acquisition systems that need independently controlled SPST paths. Four switches in a 16-pin SOIC allow a designer to route several sampled signals without using four separate packages, reducing board area and simplifying control. The 45ns typical turn-on and 15ns typical turn-off timing supports rapid channel selection, while break-before-make operation helps maintain defined switching sequences. Its 1µW low-power condition is advantageous in compact remote acquisition equipment. The 100Ω maximum on-resistance must be accounted for in the input impedance of the sampling amplifier, and leakage of up to 10nA at 85°C should be checked against the source impedance. A common ground reference and short switch traces help prevent acquisition errors.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ISL84521IB – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ISL84521IB-T |
|---|---|---|
| Package | 16-SOIC, 3.90mm width | 16-SOIC, 3.90mm width |
| Brand | Renesas Electronics | Renesas Electronics |
| Switch Count | 4 | 4 |
| Switch Configuration | 4 × SPST | 4 × SPST |
| Maximum On-Resistance | 100Ω | 100Ω |
| On-Resistance Matching Between Channels | 1Ω | 1Ω |
| Typical Turn-On Time | 45ns | 45ns |
| Typical Turn-Off Time | 15ns | 15ns |
| Single-Supply Operating Range | 3V to 12V | 3V to 12V |
| Dual-Supply Operating Range | ±3V to ±6V | ±3V to ±6V |
| Maximum Leakage Current | 10nA at 85°C | 10nA at 85°C |
| Switching Behavior | Break-before-make | Break-before-make |
Wichtigste Unterscheidungsmerkmale
- Four independent SPST paths in one 16-pin SOIC (vs. ISL84521IV)
- Specified channel-to-channel resistance matching (vs. ISL84521IV)
- Low leakage for sensitive routed nodes (vs. ISL84521IB-T)
Designhinweise
Treat the switch path as a real resistance rather than an ideal connection. The ISL84521IB has a maximum on-resistance of 100Ω and 1Ω channel matching. For a high-impedance source, add the selected channel resistance to the source impedance when calculating gain, bias current, and settling error. Use short traces and a continuous ground reference to minimize parasitic resistance and avoid injecting switching current into the measured node.
Route each control input away from sensitive switched analog paths, and place the device so the switched signals enter and leave through short, direct connections. Keep the four channels physically separate where crosstalk matters, with a common ground plane providing a nearby return path. Because the IC supports break-before-make timing, include adequate control dead time where two outputs could otherwise connect an external node to an incompatible source.
Confirm the absolute maximum input, output, and control-pin voltages for the selected single or dual supply before applying signals. The 10nA maximum leakage at 85°C may be significant when the downstream node is extremely high impedance, while the 100Ω maximum on-resistance can create excessive attenuation in a low-impedance design. Check logic thresholds, supply sequencing, and powered-off behavior against the complete datasheet electrical tables before production release.
The advertised 1µW low-power condition applies to the manufacturer's specified test condition and should not be assumed to represent every control state, voltage, or switching frequency. Analyze the complete design with the supply current from the electrical specifications, including leakage through external source impedances. A dual-supply implementation also requires correct sequencing and adequate bypass capacitance to prevent control or analog-node disturbance during transitions.
Compliance-Informationen
The manufacturer product page identifies the ISL84521 family as Pb-free and specifies minimum 2000V ESD protection per Method 3015.7. RoHS, REACH, AEC-Q100, halogen-free, and conflict-minerals status require confirmation from the exact ordering code's compliance documentation.
