SN74HC4851QPWRQ1

Texas Instruments SN74HC4851QPWRQ1 – Automotive 5‑V, 8:1 Analog Multiplexer with Injection‑Current Effect Control

The Texas Instruments SN74HC4851QPWRQ1 is an automotive‑qualified 8:1, single‑channel analog multiplexer designed for robust signal routing in 5‑V systems. Built on the HC CMOS family with AEC‑Q100 (Q1) qualification, it supports a rail‑to‑rail analog signal range from 0 V to VCC, integrates injection‑current effect control to help minimize disturbances, and comes in a compact, surface‑mount 16‑pin TSSOP (PW) package for high‑reliability automotive and industrial applications.

Quick facts

• Brand/manufacturer: Texas Instruments (TI)
• MPN: SN74HC4851QPWRQ1 (SN74HC4851‑Q1 family, PW package, tape‑and‑reel)
• Category: Analog Switches / Multiplexers
• Series: SN74HC (Automotive Q1)
• Function: 1‑channel, 8:1 analog multiplexer (8 inputs → 1 output)
• Signal range: 0 V to VCC
• Supply voltage (VCC): 2 V to 6 V (typical 5 V)
• Control: A0–A2 address lines plus EN (active‑low)
• Operating temperature: −40°C to 125°C
• Package: 16‑TSSOP (PW), tape & reel (TR)
• Mounting type: Surface mount (SMT)
• Pin count: 16
• Automotive qualification: AEC‑Q100 (Q1)

Overview

The SN74HC4851QPWRQ1 is a dependable signal‑selection building block for automotive sensor interfaces, ECUs, infotainment, and general data‑acquisition systems. Its 8:1 configuration gives you eight single‑ended analog inputs that can be routed to a single output under digital control. Because the device operates across 2 V to 6 V supplies and supports analog signals from 0 V to VCC, it integrates cleanly into both 5‑V and lower‑voltage logic systems (with 5‑V rails commonly used in automotive domains).

A key differentiator is TI’s injection‑current effect control, which is designed to help minimize disturbances when inputs experience transients, over/undershoot, or when channels switch. In automotive environments where sensors and harnesses can see noisy conditions, this feature helps maintain more stable downstream measurements by reducing the adverse effects of injected currents inside the switch network.

The Q1 automotive qualification and the extended −40°C to 125°C temperature range make the SN74HC4851QPWRQ1 suitable for deployment in safety‑critical and mission‑critical automotive subsystems where reliability and environmental resilience are essential.

Key specifications

• Type: Analog multiplexer (8:1), single channel
• Supply voltage (VCC): 2 V to 6 V (typical operation at 5 V)
• Analog signal range: 0 V to VCC (rail‑to‑rail within the supply)
• Control interface: A0, A1, A2 address lines and EN (active low)
• Operating temperature: −40°C to 125°C
• Automotive qualification: AEC‑Q100 (Q1)
• Package: 16‑TSSOP (PW), tape & reel (TR)
• Mounting type: Surface mount; 16 pins

Designers should consult the TI datasheet for electrical characteristics not listed here, such as on‑resistance, bandwidth/settling behavior, leakage, crosstalk/isolation, switching times, and ESD ratings. Not specified in datasheet (here): on‑resistance, bandwidth, leakage, crosstalk, and switching time values.

Pinning and control model

• Address selection: The three address pins A0–A2 select one of the eight analog inputs. Only one input is connected to the output at a time.
• Enable: EN is active‑low; pulling EN low enables the selected channel, while driving EN high disables the switch path.
• Logic interfacing: Use logic levels compatible with the chosen VCC. For systems mixing 3.3‑V logic with a 5‑V analog domain, ensure the control input thresholds meet the datasheet requirements for reliable operation.

Note: Detailed truth tables, input leakage for logic pins, and timing diagrams are not included here. Refer to the TI datasheet for exact control behavior and timing. Not specified in datasheet (here): logic‑level thresholds and truth table details.

Where the SN74HC4851QPWRQ1 fits best

• Automotive sensor multiplexing
• Electronic Control Units (ECUs) and body electronics
• Infotainment and driver information systems
• Data acquisition and general signal routing in 5‑V domains

Why it’s a strong fit:

• AEC‑Q100 (Q1) qualification and −40°C to 125°C rating support harsh, extended environments typical of vehicles.
• 0 V to VCC analog range simplifies front‑end matching and reduces the need for level shifting in single‑supply sensor paths.
• Injection‑current effect control helps improve measurement stability when analog inputs are subject to transients or switching activity.

Design considerations and best practices

• Power supply and decoupling: Bypass VCC with local high‑frequency decoupling (for example, a small ceramic capacitor placed close to the device). This helps maintain low impedance at the supply pin during channel switching.
• Signal range: Keep input signals within 0 V to VCC to stay within the intended operating range. Over‑ or under‑voltage at the analog pins can cause injection currents; the device includes control measures to mitigate effects, but adherence to the operating range is still best practice.
• Grounding and layout: Route sensitive analog traces away from noisy digital lines. Keep the selected output trace short and shielded (where practical) to reduce pickup.
• Enable behavior: Use EN to place the multiplexer into a disabled state when the downstream circuitry must be isolated. Ensure EN is at a defined logic state during power‑up.
• Unused channels: For unused analog inputs, provide a known bias or termination consistent with your system’s requirements to reduce susceptibility to noise.
• Mixed‑signal domain planning: When controlling the mux from lower‑voltage logic, verify logic thresholds and margin against the datasheet’s VIH/VIL specs for the selected VCC. Not specified in datasheet (here): exact VIH/VIL values.

Packaging, ordering, and supply

• Orderable part: SN74HC4851QPWRQ1
• Package: 16‑TSSOP (PW)
• Packaging: Tape & Reel (TR)
• Mounting: Surface mount (SMT)
• Pin count: 16

This ordering code denotes the Q1 automotive‑qualified device in the PW TSSOP package supplied on tape and reel, ideal for automated pick‑and‑place.

Stock and lead time: Current inventory quantity listed here is 0. For up‑to‑date availability, check TI’s product page or authorized distributors. If you require alternatives, see the guidance below and TI’s parametric search for similar 8:1 analog multiplexers.

Lifecycle, quality, and compliance

• Lifecycle status: Active (source: Texas Instruments)
• Manufacturer (OCM): Texas Instruments
• Automotive qualification: AEC‑Q100 (Q1)
• RoHS / environmental: RoHS compliant, lead‑free

The active lifecycle designation indicates the SN74HC4851‑Q1 is in production and supported by TI, which is especially important for long‑lifecycle automotive programs.

Compliance documentation:

• AEC‑Q100 and quality summary: https://www.ti.com/product/SN74HC4851-Q1#quality
• Product page: https://www.ti.com/product/SN74HC4851-Q1
• Datasheet (GPN landing): https://www.ti.com/lit/gpn/sn74hc4851-q1

Replacement and alternative considerations

• Direct replacements: None are listed in this summary. Always verify pin‑compatibility and electrical parameters in the TI datasheet before substituting any device.
• Family variants: If automotive Q1 qualification is not required, you may evaluate the non‑Q1 SN74HC4851 family options with the same PW package footprint. Confirm all electrical characteristics, temperature rating, and ordering codes against your requirements. Not specified in datasheet (here): exact non‑Q1 ordering codes and parameter differences.
• Parametric search: Use TI’s online parametric filters to compare 8:1 multiplexers across voltage ranges, leakage, on‑resistance, bandwidth, and special features.

Note: Do not assume drop‑in compatibility without a full review. Differences in leakage, on‑resistance, timing, ESD, and temperature grades can be critical to system performance and qualification status.

Practical application examples

• Sensor hub consolidation: Route up to eight analog sensors (for example, temperature, position, or light sensors) into a single ADC channel to reduce component count and ADC requirements.
• Redundant input selection: Select between primary and backup sensor inputs in safety‑minded designs by using the EN control for safe disengagement when needed.
• Diagnostics: Time‑share an ADC across multiple test points in ECUs or infotainment systems, using the address pins for systematic scanning.

These examples rely on the device’s wide supply range, rail‑to‑rail handling within VCC, and controlled behavior during switching events.

Specifications summary

• Brand: Texas Instruments
• MPN: SN74HC4851QPWRQ1
• Series: SN74HC (Automotive Q1)
• Category: Analog Switches / Multiplexers
• Type: Analog multiplexer
• Channels/configuration: 1 (8:1)
• Control pins: A0–A2, EN (active low)
• Signal range: 0 V to VCC
• Supply voltage (VCC): 2 V to 6 V (typ. 5 V)
• Operating temperature: −40°C to 125°C
• Automotive qualification: AEC‑Q100 (Q1)
• Package: 16‑TSSOP (PW)
• Packaging: Tape & Reel (TR)
• Mounting type: Surface mount
• Pin count: 16

Not specified in datasheet (here): on‑resistance, bandwidth, leakage, crosstalk, ESD, and timing parameters. Consult TI’s datasheet for full electrical data and design limits.

Frequently asked questions (FAQs)

Q: What does “injection‑current effect control” mean in the SN74HC4851‑Q1?
A: It refers to TI’s design measures to mitigate disturbances caused by injected currents when inputs see transients or when switching occurs, helping to maintain stable measurements in noisy environments.

Q: What is the analog input/output range for this multiplexer?
A: The device supports analog signals from 0 V to VCC.

Q: Can I run the device at 3.3 V logic while passing 0–3.3 V analog signals?
A: Yes, operation within the 2 V to 6 V VCC range allows 0–VCC analog signals. Ensure your digital control levels (A0–A2, EN) meet the datasheet’s VIH/VIL specs at the chosen VCC. Not specified in datasheet (here): exact VIH/VIL thresholds.

Q: Is the SN74HC4851QPWRQ1 automotive qualified?
A: Yes, it is AEC‑Q100 (Q1) qualified.

Q: What package and ordering code should I use for SMT production?
A: The 16‑TSSOP (PW) package supplied on tape‑and‑reel is ordered as SN74HC4851QPWRQ1.

Q: What is the operating temperature range?
A: −40°C to 125°C.

Q: Does the datasheet specify on‑resistance or bandwidth?
A: Those values are not included in this summary. Refer to the TI datasheet for detailed electrical characteristics. Not specified in datasheet (here): on‑resistance, bandwidth, leakage, crosstalk, and timing.

Resources

• TI product page: https://www.ti.com/product/SN74HC4851-Q1
• TI datasheet: https://www.ti.com/lit/gpn/sn74hc4851-q1
• Quality and compliance: https://www.ti.com/product/SN74HC4851-Q1#quality

If you are qualifying the Texas Instruments SN74HC4851QPWRQ1 for a new program, use the links above to validate the latest lifecycle status, compliance documents, ordering options, and full electrical specifications.