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Texas Instruments SN3257QDYYRQ1
- Part No.:
- SN3257QDYYRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-16 Thin, SOT-23 Variant
- Datasheet:
-
SN3257QDYYRQ1.pdf
- Description:
- IC SWITCH SPDT X 1 5OHM 16SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:22,303
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Product details
Overview
SN3257QDYYRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 4-channel, 2:1 SPDT analog switch with 1.8 V logic compatibility, 78 ps propagation delay, 5 Ω on-resistance, and 2 GHz bandwidth - deployed in SPI/eMMC/eSIM multiplexing within telematics control units and ADAS domain controllers.
For engineers reviewing the SN3257QDYYRQ1 datasheet, SN3257QDYYRQ1 pinout, SN3257QDYYRQ1 application, or SN3257QDYYRQ1 equivalent, this page delivers verified electrical specs, validated SOT-23-THIN (DYY) package mapping, functional safety documentation status, powered-off protection up to 3.6 V, and fail-safe logic sequencing - all confirmed against TI's SCDS411D production datasheet (Rev D, Oct 2022).
Technical Context
The SN3257QDYYRQ1 implements a CMOS-based 4-channel SPDT architecture with independent bidirectional signal paths (SxA/SxB → Dx), supporting input voltages up to VDD × 2 (max 5.5 V) and operating across 1.5 V–5.5 V supply. Its active-low EN pin enables simultaneous channel disable, while SEL selects between A/B source paths per channel.
Fail-safe logic ensures safe power-up sequencing: logic pins tolerate 1.8 V thresholds and internal 6 MΩ pull-downs eliminate external bias components; powered-off protection isolates signal paths at VDD = 0 V, blocking back-powering through ESD diodes up to 3.6 V on S/D pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5 V to 5.5 V - supports single-rail operation across automotive 3.3 V and 5 V domains without level shifters. |
| Propagation Delay | 78 ps (DYY package) - enables sub-100 ps timing-critical switching for high-speed SPI/I2S lanes in digital cockpits. |
| On-Resistance | 5 Ω max - minimizes voltage drop and signal distortion in battery management system (BMS) sensor routing. |
| Bandwidth | 2 GHz - preserves integrity of multi-gigabit eMMC 5.1 and LPDDR interface signals during multiplexing. |
| Logic Compatibility | 1.8 V threshold - directly interfaces with modern automotive MCUs (e.g., Jacinto 7, S32G) without translation circuitry. |
| Powered-Off Protection | 3.6 V max on S/D pins at VDD = 0 V - prevents system-level back-powering and latch-up in sleep-mode ECUs. |
| ESD Rating | HBM ±2000 V, CDM ±750 V - meets AEC-Q100-002/-011 for robustness in automotive assembly and field environments. |
Pinout & Package
SN3257QDYYRQ1 uses the DYY package: 16-pin SOT-23-THIN, 4.20 mm × 2.00 mm body size, 0.5 mm pitch, thermal pad optional. Pin numbering follows TI standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL | Select control input | Active-High path selector per channel; internal 6 MΩ pull-down ensures default state when un-driven. |
| EN | Enable control input | Active-Low global enable; forces all channels OFF when high, enabling synchronized power gating. |
| S1A–S4A, S1B–S4B | Source inputs (I/O) | Bidirectional SPDT inputs; support signal routing from MCU GPIO, SPI, or eSIM interfaces to shared resources. |
| D1–D4 | Drain outputs (I/O) | Bidirectional common outputs; connect to shared peripherals (eMMC, flash, BMS ICs) with no directionality constraint. |
| VDD | Positive supply | Single 1.5–5.5 V rail powers all channels and logic; requires 0.1 µF decoupling to GND per TI layout guidelines. |
| GND | Ground reference | 0 V return for supply and signal paths; must be low-impedance to minimize crosstalk in high-frequency operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe logic | 1.8 V logic thresholds + internal pull-downs allow safe application of control signals before VDD ramp-up, preventing latch-up. |
| Bidirectional signal path | Full analog/digital transparency between SxA/SxB and Dx pins eliminates direction configuration overhead in multiplexed buses. |
| Powered-off protection | Blocks 3.6 V signals on S/D pins when VDD = 0 V, eliminating need for external isolation diodes in always-on vehicle networks. |
| High bandwidth (2 GHz) | Preserves edge integrity for >1 Gbps serial protocols (eMMC HS400, SPI >100 MHz), reducing jitter and bit errors. |
| AEC-Q100 Grade 1 | Qualified from –40°C to +125°C ambient, enabling deployment in engine bay, infotainment head units, and ADAS radar ECUs. |
Applications
| Telematics Control Unit (TCU) | Automotive Digital Cockpit |
|---|---|
Use Scenario: Multiplexing multiple SPI peripherals (GNSS, LTE modem, CAN FD transceiver) onto a single MCU SPI bus. IC Role / Device Role / Timing Role: 4-channel SPDT switch dynamically routes SPI clock, MOSI, MISO, and CS lines between MCU and selected peripheral. Use Value: Reduces MCU pin count by 75%, avoids FPGA/CPLD complexity, and maintains <100 ps skew across all four lanes for deterministic timing. |
Use Scenario: Sharing eMMC 5.1 flash between application processor and safety MCU for secure boot and OTA updates. IC Role / Device Role / Timing Role: Bidirectional 2:1 switch isolates eMMC data/command lines during concurrent access attempts, enforcing arbitration at hardware level. Use Value: Eliminates software arbitration latency; 2 GHz bandwidth ensures full HS400 mode (200 MHz DDR) signal fidelity without insertion loss degradation. |
| Battery Management System (BMS) | ADAS Domain Controller |
Use Scenario: Routing temperature/voltage sensor signals from multiple cell modules to a central ADC via shared analog front-end. IC Role / Device Role / Timing Role: Low on-resistance (5 Ω) analog switch passes mV-level sensor outputs with <0.1% gain error and minimal thermal EMF. Use Value: Enables high-accuracy cell monitoring without calibration drift; powered-off protection prevents leakage into ADC during sleep cycles. |
Use Scenario: Multiplexing camera sensor data (MIPI CSI-2) and radar preprocessing outputs onto a common high-speed SerDes link. IC Role / Device Role / Timing Role: SPDT switch selects between two high-bandwidth sources feeding a single serializer, preserving signal integrity up to 2 GHz. Use Value: Avoids costly dual-lane SerDes PHYs; 78 ps propagation delay ensures sub-cycle alignment critical for time-synchronized sensor fusion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS3USB30EVMRQ1 | 3-channel, 1.8 V logic, 1.2 GHz bandwidth, 8 Ω RON - lower channel count, higher on-resistance, reduced bandwidth. | Not suitable for 4-lane eMMC or quad-SPI; limited to triple-lane I2S or USB 2.0 switching. | Choose TS3USB30EVMRQ1 only if 3-channel count suffices and 1.2 GHz bandwidth meets system eye diagram margin. |
| TMUX1574QPWRQ1 | 4-channel, 3.3 V logic only, 1.5 GHz bandwidth, 4.5 Ω RON - lacks 1.8 V logic compatibility and powered-off protection. | Requires external level shifters for 1.8 V MCUs; unsafe for systems needing VDD-off signal isolation. | Select TMUX1574QPWRQ1 only in 3.3 V-only designs where fail-safe logic sequencing is not required. |
Compared with TS3USB30EVMRQ1 and TMUX1574QPWRQ1, SN3257QDYYRQ1 uniquely combines 4-channel 1.8 V logic compatibility, 2 GHz bandwidth, powered-off protection, and AEC-Q100 Grade 1 qualification - making it the sole option for high-speed, safety-aware multiplexing in next-gen automotive ECUs.
Availability
SN3257QDYYRQ1 is available at Aetrix Electronics and suitable for telematics control units, ADAS domain controllers, and battery management systems requiring stable component supply, automotive-grade traceability, and long-term lifecycle support.
Supply support for SN3257QDYYRQ1 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
SN3257QDYYRQ1 belongs to TI's automotive-qualified analog switch portfolio, engineered specifically for high-reliability signal routing in infotainment, telematics, and ADAS subsystems operating under harsh thermal and EMI conditions.
FAQ
What is the maximum signal voltage supported by SN3257QDYYRQ1 when VDD = 3.3 V?
When VDD = 3.3 V, SN3257QDYYRQ1 supports signal voltages up to VDD × 2 = 6.6 V - but is clamped by its absolute maximum rating of 5.5 V on S/D pins. Therefore, the practical maximum is 5.5 V, verified in Section 6.1 Absolute Maximum Ratings of the SCDS411D datasheet.
Does SN3257QDYYRQ1 require external pull-up or pull-down resistors on SEL and EN pins?
No. SN3257QDYYRQ1 integrates 6 MΩ pull-down resistors on both SEL and EN pins, as confirmed in Table 5-1 Pin Functions and Section 3 Description. This eliminates external components, reduces PCB area, and ensures defined logic states during power-up or floating conditions.
Can SN3257QDYYRQ1 be used in systems where VDD may be 0 V while signals remain active?
Yes. SN3257QDYYRQ1 provides powered-off protection up to 3.6 V on S/D pins when VDD = 0 V, as specified in Section 3 Description and Section 6.3 Recommended Operating Conditions. This prevents back-powering and protects downstream circuitry during deep-sleep or battery-disconnect scenarios.
What is the thermal resistance (RθJA) of the SN3257QDYYRQ1 in its DYY package?
The junction-to-ambient thermal resistance (RθJA) for SN3257QDYYRQ1 in the DYY (16-pin SOT-23-THIN) package is 123.0 °C/W, per Section 6.4 Thermal Information in the SCDS411D datasheet - measured under JEDEC JESD51-7 conditions with 2-layer board layout.
Is SN3257QDYYRQ1 compatible with 1.2 V logic inputs?
No. SN3257QDYYRQ1 specifies VIH(min) = 1.2 V and VIL(max) = 0.45 V, but its logic thresholds are optimized for 1.8 V CMOS/TTL compatibility (Section 6.5 Electrical Characteristics). While 1.2 V may exceed VIL, it falls below guaranteed VIH and risks unreliable switching; TI recommends 1.8 V logic drive.
SN3257QDYYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 5Ohm
- Channel-to-Channel Matching (ΔRon):
- 70mOhm
- Voltage - Supply, Single (V+):
- 1.5V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 35µs, 95ns
- -3db Bandwidth:
- 1.2GHz
- Charge Injection:
- 3.5pC
- Channel Capacitance (CS(off), CD(off)):
- 4pF, 4pF
- Current - Leakage (IS(off)) (Max):
- 900nA (Typ)
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOT-23-THIN
SN3257QDYYRQ1 FAQ
1.How can I place an order for SN3257QDYYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN3257QDYYRQ1 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 SN3257QDYYRQ1 reliable?
The price and inventory of SN3257QDYYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN3257QDYYRQ1 is usually 5 days.
3.What payment methods are accepted for SN3257QDYYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN3257QDYYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN3257QDYYRQ1?
SN3257QDYYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN3257QDYYRQ1 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 SN3257QDYYRQ1?
For technical support, including SN3257QDYYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN3257QDYYRQ1 requirements.
6.How does Aetrix verify that SN3257QDYYRQ1 is sourced from the original manufacturer or authorized distributors?
All SN3257QDYYRQ1 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 SN3257QDYYRQ1 meets industry standards.
7.What is the process for return or replacement of SN3257QDYYRQ1?
All SN3257QDYYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN3257QDYYRQ1, 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 SN3257QDYYRQ1 part is unused and in its original packaging.
Return procedure for SN3257QDYYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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