TS3A4751PWR - 0.9-Ohm Quad SPST Analog Switch | Texas Instruments
MPN: TS3A4751PWR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.43 | $43.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.31 | $310.00 |
Drop-in alternatives for TS3A4751PWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TS3A4751PWRG4
β Drop-Inπ Reference alternative (not in catalog)
TS3A4751PWR Maximum Ratings & Electrical Characteristics
| Product Type | 4-channel SPST analog switch (NO) |
| Supply Voltage Range | 1.6 V to 3.6 V |
| On-State Resistance (Ron) Max | 0.9 ohm at 3-V supply |
| Ron Max at 1.8 V | 1.5 ohm |
| Ron Flatness Max | 0.4 ohm at 3 V |
| Ron Matching Max | 0.05 ohm at 3 V |
| Logic Compatibility | 1.8-V CMOS compatible at 3-V supply |
| Switch Configuration | 1:1 (SPST), normally open, bidirectional |
| Signal Range | Rail-to-rail analog signals |
| Quiescent Power | Very low quiescent power |
| Number of Channels | 4 |
| Package | 14-TSSOP (PW) |
| Mounting Type | Surface Mount |
| Alternate Packages | 14-VQFN (RGY), X2QFN-12 (RUC) |
TS3A4751PWR Pin Configuration
| Pin 1 | IN1 β Control input for switch 1 (1.8-V CMOS compatible at 3-V supply) |
| Pin 2 | NO1 β Normally-open terminal of switch 1 |
| Pin 3 | COM1 β Common terminal of switch 1 |
| Pin 4 | COM2 β Common terminal of switch 2 |
| Pin 5 | NO2 β Normally-open terminal of switch 2 |
| Pin 6 | IN2 β Control input for switch 2 |
| Pin 7 | GND β Ground |
| Pin 8 | IN3 β Control input for switch 3 |
| Pin 9 | NO3 β Normally-open terminal of switch 3 |
| Pin 10 | COM3 β Common terminal of switch 3 |
| Pin 11 | COM4 β Common terminal of switch 4 |
| Pin 12 | NO4 β Normally-open terminal of switch 4 |
| Pin 13 | IN4 β Control input for switch 4 |
| Pin 14 | VCC β Supply voltage, 1.6 V to 3.6 V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TS3A4751PWR is suitable for 6 applications: Low-Voltage Power Switching, Portable Audio Signal Routing, Battery-Powered Test Equipment, Sensor Multiplexing in Industrial Modules, Smartphone and Tablet Board-Level Signal Muxing, Automotive-Adjacent Test-Point Isolation.
Low-Voltage Power Switching
The TS3A4751 fits low-voltage power-switching duties on 1.8-V to 3.3-V rails because its 0.9-ohm maximum Ron at 3 V keeps voltage drop low even at hundreds of milliamps. For a 100-mA load, the drop is only about 90 mV at 3 V. The bidirectional, rail-to-rail switch handles both sourcing and sinking currents, and the normally-open default keeps loads disconnected during startup. Place the switch between the rail and the load with a 0.1-uF bypass capacitor; account for the 1.5-ohm worst-case Ron when powered at 1.8 V.
Recommended
Portable Audio Signal Routing
In smartphones and portable audio devices, the TS3A4751 routes headphone, line-in, or microphone signals with minimal degradation. The 0.05-ohm maximum Ron matching and 0.4-ohm flatness keep channel gain error and THD low across the audio band, while rail-to-rail operation preserves the full 3.3-V signal swing. The 1.8-V compatible control inputs connect directly to baseband GPIO. Because it is normally open, audio paths default to muted when unpowered - useful for jack-detect and accessory-switching circuits.
Recommended
Battery-Powered Test Equipment
Handheld multimeters and battery testers use the TS3A4751 to connect measurement points to front-end circuitry only when needed, saving quiescent power. Very low quiescent consumption extends battery life, while the 1.6-V minimum supply works directly from a single NiMH or lithium coin cell stack. Ron matching of 0.05 ohm keeps differential measurements consistent across channels. The normally-open configuration protects the front end by defaulting to a disconnected state between measurements.
Recommended
Sensor Multiplexing in Industrial Modules
Factory sensor hubs use the TS3A4751 to time-share one ADC input among multiple analog sensor channels. The 0.9-ohm Ron introduces negligible divider error with typical 10-kohm sensor source impedances, and fast switching supports quick channel scanning. Rail-to-rail handling covers full-scale sensor outputs on 3.3-V rails. Designers should verify settle time after switching, since Ron times the source impedance and ADC sample capacitor form an RC that must settle within the ADC acquisition window.
Recommended
Smartphone and Tablet Board-Level Signal Muxing
The 2x2-mm X2QFN (RUC) package variant makes the TS3A4751 attractive for space-constrained smartphone and tablet boards where board area is premium. It muxes USB audio accessory lines, SIM or SD detect lines, and debug signals, with 1.8-V logic compatibility matching modern application-processor GPIO rails. The very low quiescent power suits always-on subsystems. Layout should keep the switch close to connectors to limit stub lengths and preserve signal integrity on high-speed detect lines.
Recommended
Automotive-Adjacent Test-Point Isolation
In electronic control modules and infotainment boards, the TS3A4751 isolates production test points from active circuitry, letting ICT fixtures probe nets without loading them during operation. The normally-open switches default to isolated, protecting sensitive nodes, and the 1.8-V compatible logic integrates with low-voltage test controllers. Because on-resistance of 0.9 ohm is far below typical probe thresholds, measurement accuracy is preserved. Use 0.1-uF local decoupling on the switch supply to reject transients from surrounding power rails.
Recommended
Recommended Products Summary
Engineering reference data for TS3A4751PWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TS3A4751PWRG4 | TS3A4751RGYR | TMUX1511 | TMUX1111 |
|---|---|---|---|---|---|
| Package | 14-TSSOP (PW) | 14-TSSOP (PW) - same | 14-VQFN (RGY) - different footprint | [DATA_NEEDED] | [DATA_NEEDED] |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | up to 5 V (per TI E2E) | up to 5 V (per TI E2E) |
| Ron Max | 0.9 ohm at 3 V | 0.9 ohm at 3 V | 0.9 ohm at 3 V | [DATA_NEEDED] | [DATA_NEEDED] |
| Switch Configuration | 4x SPST, normally open | 4x SPST, NO | 4x SPST, NO | 4x SPST, NO | 4x SPST, NC |
| Logic Compatibility | 1.8-V CMOS at 3-V supply | 1.8-V CMOS | 1.8-V CMOS | [DATA_NEEDED] | [DATA_NEEDED] |
| Signal Range | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Drop-in Replacement | - | Yes - same package and die | No - new footprint | No - new footprint | No - new footprint |
Key Differentiators
- Ultra-low Ron for a low-voltage switch (vs TMUX1511)
- 1.8-V CMOS compatible control inputs (vs TMUX1111)
- Space-saving package options (vs TS3A4751PWRG4)
Design Notes
Ron scales with supply voltage: 0.9-ohm maximum at 3 V rises to 1.5-ohm maximum at 1.8 V per the TI datasheet. For power-switching loads, calculate worst-case drop at the minimum expected supply, not nominal. At 1.8 V and 100 mA, the drop can reach 150 mV, which may matter for low-voltage rails with tight tolerance.
Place a 0.1-uF ceramic decoupling capacitor directly at the VCC pin (pin 14) with a short return to GND (pin 7). Keep analog signal traces on COM/NO pins short and symmetric for matched channels. The TSSOP-14 body is thermal and electrical friendly; no thermal pad is present, so no special copper pour is required.
Do not apply analog signals beyond the supply rails (GND to VCC) - the switch is not fault-protected, and overvoltage on NO/COM pins can damage the device. Also remember switches are normally open: if your application requires a connected-by-default path, consider the NC TMUX1111 instead, as recommended on TI E2E support forums.
Compliance Information
RoHS compliance per DigiKey/TI product listings for TS3A4751PWR. G4 suffix indicates TI green/RoHS variant. REACH, halogen-free, and conflict-minerals status not present in retrieved data.
