ISL8394IB - Quad SPDT Analog Switch | Renesas Electronics
部品番号: ISL8394IB ✗ 生産終了ISL8394IB 概要
An analog switch is an integrated semiconductor that routes analog signals between circuit nodes under digital control. The ISL8394 belongs to the analog-switch and multiplexer hierarchy, where an SPDT switch selects one of two signal paths per common terminal. Four separately controlled SPDT circuits provide flexible signal routing for test, measurement, communication, and battery-powered equipment. This makes the ISL8394 more useful than a single fixed multiplexer when several independent connections must be switched.
Key performance characteristics include fast transition times of 50 ns for turn-on and 30 ns for turn-off. Charge injection is limited to 10 pC, helping control timing errors when the device switches low-level or high-impedance signals. Maximum leakage current at 85°C is 2.5 nA, and typical power consumption is 5 microwatts. The manufacturer also specifies a maximum on-resistance flatness of 4 ohms, providing more consistent channel resistance across the operating signal range.
The device accepts single or dual power rails, which supports both conventional positive-supply designs and bipolar signal paths. Each SPDT switch has a separate control input, allowing independent routing decisions. Break-before-make operation is guaranteed, while minimum 2,000 V ESD protection per Method 3015.7 improves robustness against electrostatic discharge encountered during handling or testing.
Typical uses include battery-powered instrumentation, signal-path multiplexing, automated test equipment, communication interfaces, and portable measurement systems. The low 5 microwatt power consumption and 2.5 nA maximum leakage are especially useful when preserving battery life or measuring high-impedance sources. The 20-SOIC package also supports conventional surface-mount assembly methods.
Designers should account for the 35 ohm maximum on-resistance, 10 pC maximum charge injection, and control-signal timing when selecting capacitors, amplifiers, or downstream circuits. Designers should also verify the exact pin functions, supply sequence, and operating limits against the manufacturer datasheet before layout because the public web data provided for this page does not include a complete pin table.
This page consolidates the verified manufacturer and distributor data for the ISL8394IB, adds application-focused engineering context, and distinguishes verified drop-in references from package or sourcing variants that should not be treated as PCB drop-in replacements.
ドロップイン代替品: ISL8394IB — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
ISL8394IBZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX394CWP+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ISL8394IB 最大定格＆電気的特性
| Number of Switches | 4 |
| Switch Configuration | 4 independently controlled 2:1 SPDT circuits |
| Typical On-Resistance | 17 ohm |
| Maximum On-Resistance | 35 ohm |
| On-Resistance Matching Between Channels | 1 ohm |
| Maximum On-Resistance Flatness | 4 ohm |
| Single-Supply Operating Range | +2 V to +12 V |
| Dual-Supply Operating Range | ±2 V to ±6 V |
| Typical Turn-On Time | 50 ns |
| Typical Turn-Off Time | 30 ns |
| Maximum Charge Injection | 10 pC |
| Maximum Leakage Current at 85°C | 2.5 nA |
| Typical Power Consumption | 5 microwatt |
| ESD Protection | 2000 V minimum per Method 3015.7 |
| Logic Compatibility | TTL and CMOS compatible |
| Switching Sequence | Guaranteed break-before-make |
| パッケージ | 20-pin SOIC |
| 実装タイプ | Surface mount |
ISL8394IB 20-pin soic ピン配置ガイド
ISL8394IB (20-pin soic パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: ISL8394IB.
詳細は データシート をご参照ください。
主な用途
ISL8394IB の用途: 6 件s: Battery-Powered Test and Measurement Equipment, Automated Signal-Path Multiplexing, Portable Communication Signal Routing, High-Impedance Sensor Interface, Low-Voltage Dual-Supply Signal Routing, ESD-Protected External Interface Routing.
Battery-Powered Test and Measurement Equipment
The ISL8394IB fits battery-powered test and measurement equipment because its typical power consumption is only 5 microwatt and its maximum leakage current is 2.5 nA at 85°C. Four independently controlled SPDT circuits can route measurement inputs without requiring four separate switch packages. The 17 ohm typical and 35 ohm maximum on-resistance must be included in the source-impedance budget, while the 10 pC maximum charge injection is important when the selected signal source has high impedance. Its single +2V to +12V supply support simplifies compact portable designs, and the TTL-compatible control inputs facilitate interfacing with low-power digital controllers.
Automated Signal-Path Multiplexing
The ISL8394IB is suitable for automated signal-path multiplexing where four independent SPDT switches must select between alternative sources, loads, or test paths. Each circuit can make a separate routing decision, reducing the number of discrete switch components required on a measurement or interface board. With 50 ns typical turn-on and 30 ns typical turn-off times, the device supports fast control sequences, while guaranteed break-before-make operation prevents the two paths from being connected together during switching. Engineers should still evaluate the 35 ohm maximum on-resistance, 4 ohm maximum flatness, and downstream settling requirements for precision measurements.
Portable Communication Signal Routing
The ISL8394IB can route low-voltage communication signals in portable equipment when channel count and leakage are more important than very low on-resistance. Its four separately controlled SPDT paths allow transmit, receive, isolation, or accessory lines to be switched independently. The device accepts a single +2V to +12V rail, while its TTL- and CMOS-compatible inputs ease connection to common embedded controllers. Low leakage of 2.5 nA maximum at 85°C helps preserve weak signals, but the 35 ohm maximum on-resistance can attenuate high-impedance sources and should be included in link-budget calculations.
High-Impedance Sensor Interface
The ISL8394IB is applicable to high-impedance sensor and probe interfaces because its maximum leakage current is 2.5 nA at 85°C. The four SPDT circuits can support range, polarity, or source selection without introducing multiple package footprints. Charge injection remains the main precision concern: the manufacturer specifies a maximum of 10 pC, which can create a transient voltage error across a sensitive source impedance or sampling capacitor. A practical design should account for that injected charge during acquisition timing, use a suitable return path, and verify that the 35 ohm maximum on-resistance does not impair the measurement transfer function.
Low-Voltage Dual-Supply Signal Routing
The ISL8394IB supports bipolar routing from ±2V to ±6V, making it useful for circuits that require symmetrical positive and negative signal paths. Dual-supply operation allows signals around ground to be switched without shifting the common-mode reference. The four independently controlled SPDT circuits provide flexible polarity, channel, or loop selection in test fixtures and analog front ends. Because the device also operates from a single +2V to +12V source, the same family can support lower-cost unipolar designs. Layout must preserve a clean return path and follow the exact datasheet guidance for bypassing, control levels, and unused terminals.
ESD-Protected External Interface Routing
The ISL8394IB is appropriate for external interface routing where electrostatic-disure robustness is important. Renesas specifies minimum 2,000 V ESD protection per Method 3015.7, and the device guarantees break-before-make operation. Those characteristics help protect connected circuitry during controlled switching, although the system still needs board-level protection for connectors and cables. Four SPDT channels can isolate external paths, select test loops, or connect redundancy networks. The 30 ns typical turn-off and 50 ns turn-on times allow rapid isolation, while the 35 ohm maximum on-resistance must be considered if the protected interface also carries high-bandwidth or precision signals.
エンジニアリング参考データ: ISL8394IB — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ISL8394IBZ | MAX394CWP+T |
|---|---|---|---|
| Package | 20-SOIC | 20-SOIC | 20-SOIC |
| Brand | Renesas Electronics | Renesas Electronics | Maxim Integrated |
| Switch Configuration | Quad independently controlled SPDT | Quad SPDT family variant | Quad SPDT family variant |
主な差別化要因
- Documented drop-in relationship with the MAX394 family （vs MAX394CWP+T)
- Low power consumption for portable routing （vs MAX394CWP+T)
- Fast and defined switching behavior （vs MAX394CWP+T)
設計ノート
Include the 35 ohm maximum on-resistance and 4 ohm maximum flatness in the signal-chain error budget. For a high-impedance source, on-resistance can combine with input capacitance to alter rise time or attenuate the measured signal. For low-impedance paths, the larger effect may be insertion loss relative to the transmission-line impedance. Simulate the complete source, switch, load, and acquisition network rather than treating the switch as an ideal closed resistance.
Charge injection is specified at up to 10 pC and can create a transient error when the switched node feeds a high-impedance amplifier or sampling capacitor. Estimate the resulting peak error using the injected charge divided by the effective node capacitance, then provide a settling interval before conversion. Keep the return path short and verify that leakage from PCB contamination or surrounding components does not exceed the useful source current.
The single-supply range is +2V to +12V and the dual-supply range is ±2V to ±6V. Do not apply the dual-supply limits to a single +12V configuration, and do not exceed +12V on the positive rail in single-supply operation. Confirm control-signal levels against the TTL- and CMOS-compatible specifications in the manufacturer datasheet, especially near the low end of the supply range where valid high and low thresholds may change.
Place the ISL8394IB close to the sources, loads, and control circuitry whose transitions must remain clean. Keep supply and ground connections short, provide normal bypass capacitance as specified by the manufacturer datasheet, and route high-impedance nodes with minimal exposed area. Because the complete verified pin table was unavailable in the supplied excerpts, do not finalize a footprint connection until every terminal has been cross-checked against the official datasheet.
コンプライアンス情報
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for ISL8394IB. AEC-Q100 is not applicable because this is an analog switch rather than an automotive-qualified device, and no AEC-Q100 claim was provided.
