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STMicroelectronics M74HC4851B1R
- Part No.:
- M74HC4851B1R
- Manufacturer:
- STMicroelectronics
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC4851B1R.pdf
- Description:
- IC MUX 8:1 195OHM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
M74HC4851B1R from STMicroelectronics is a single 8-channel analog multiplexer/demultiplexer with injection current protection, designed for high-reliability signal routing in automotive and industrial systems. It operates from 2 V to 6 V, delivers 150 Ω typical ON resistance at 6 V, achieves 8.6 ns propagation delay at 4.5 V, and supports -55 °C to +125 °C operation in SO-16 package.
For engineers reviewing the M74HC4851B1R datasheet, M74HC4851B1R pinout, M74HC4851B1R application, or M74HC4851B1R equivalent, this page provides verified functional specifications, validated pin roles, confirmed automotive-grade performance metrics, and real-world use context for analog channel selection under overvoltage fault conditions.
Technical Context
The M74HC4851B1R implements silicon gate C2MOS technology with dedicated injection current control circuitry that isolates enabled analog channels from voltage excursions on disabled inputs - enabling signals up to VCC + 0.5 V or down to GND without cross-talk. Its three-bit binary select (A/B/C) and active-low INH input provide deterministic channel enable/disable logic.
It features latch-up immunity exceeding 500 mA per JESD17, HBM ESD rating of 2000 V, and guaranteed operation across full industrial temperature range. The device maintains ≤1 mV output voltage shift under 1 mA injection current with RS ≤ 3.9 kΩ, eliminating external diode-resistor clamping networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports direct interface with 3.3 V and 5 V logic domains without level shifting. |
| RON (typ.) | 150 Ω at VCC = 6 V - ensures minimal signal attenuation and distortion for precision analog switching. |
| tpd (typ.) | 8.6 ns at VCC = 4.5 V - enables high-speed multiplexing in data acquisition and sensor readout paths. |
| VΔOUT (max) | 1 mV at VCC = 5 V, IIN ≤ 1 mA - guarantees <1 mV crosstalk-induced error during fault conditions. |
| ICC (max) | 2 μA at TA = 25 °C - allows battery-powered or ultra-low-power system integration. |
| Operating Temp | -55 °C to +125 °C - qualified for under-hood automotive and harsh industrial environments. |
| ESD HBM | 2000 V - meets AEC-Q100 stress requirements for robust handling in production and field use. |
Pinout & Package
SO-16 package: 16-pin small outline integrated circuit with 1.27 mm pitch, 9.8–10.0 mm body length, and 5.8–6.2 mm body width. RoHS-compliant, ECOPACK®-qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 3 | COM | Common analog I/O node - bidirectional path shared across all 8 channels; must be routed with controlled impedance. |
| 6 | INH | Active-low inhibit input - disables all switches when high, preventing unintended channel conduction. |
| 7 | NC | No internal connection - must remain unconnected and floating; no PCB trace or pull-up/down required. |
| 9,10,11 | A,B,C | 3-bit binary channel select inputs - define which of eight analog paths (0–7) connects to COM; synchronous with INH. |
| 1–5,12–15 | 0–7 | Independent analog I/O terminals - each serves as input (MUX mode) or output (DEMUX mode); support bidirectional signal flow. |
| 8 | GND | Analog/digital ground reference - requires low-impedance connection to system ground plane to minimize noise coupling. |
| 16 | VCC | Positive supply rail - must be decoupled with ≥100 nF ceramic capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Injection current protection | Enables fault-tolerant analog routing where disabled channels may experience overvoltage transients up to VCC + 0.5 V without corrupting the selected channel's signal. |
| Low ON resistance variation | ΔRON ≤ 18 Ω max across all channels at 6 V - ensures matched gain and phase response in multi-channel instrumentation designs. |
| Wide supply voltage range | Operates from 2 V to 6 V - eliminates need for separate voltage regulators when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU + 5 V sensors). |
| High noise immunity | VNIH/VNIL = 28% VCC min - rejects fast transient noise on select lines without false channel switching in electrically noisy environments. |
| Pin compatibility | Direct replacement for industry-standard 4051 and 4851 series - allows drop-in upgrade path with no PCB redesign. |
Applications
| Automotive Cabin Control | Industrial Sensor Hub |
|---|---|
|
Use Scenario: Multiplexing analog outputs from 8 temperature, pressure, and humidity sensors in HVAC control module. IC Role / Device Role / Timing Role: Analog MUX routing sensor signals to single ADC input under microcontroller control. Use Value: Eliminates need for 8-channel ADC; injection current protection prevents signal corruption during load dump events on adjacent sensor lines. |
Use Scenario: Consolidating analog voltage readings from multiple motor current shunts and thermistors in PLC I/O module. IC Role / Device Role / Timing Role: High-reliability analog switch enabling sequential sampling of 8 analog inputs by one precision SAR ADC. Use Value: 150 Ω RON and 8.6 ns tpd ensure minimal settling error and timing jitter in 100 kSPS acquisition systems. |
| Medical Diagnostic Interface | Test Equipment Signal Routing |
|
Use Scenario: Selecting between 8 patient electrode inputs in portable ECG front-end before amplification and digitization. IC Role / Device Role / Timing Role: Fault-tolerant analog multiplexer ensuring signal integrity despite electrode contact faults or ESD events. Use Value: 2000 V HBM ESD rating and <1 mV VΔOUT guarantee clinical-grade baseline stability during transient exposure. |
Use Scenario: Reconfiguring analog stimulus/response paths in automated test equipment for component parametric validation. IC Role / Device Role / Timing Role: Precision analog switch enabling programmable interconnection of DUT, source, and measurement nodes. Use Value: 2 μA ICC and -55 °C to +125 °C operation support unattended long-duration burn-in and environmental stress testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC4051M96 | Higher RON (180 Ω typ. at 4.5 V), no injection current specification, rated only to +125 °C (not -55 °C). | Lacks automotive-grade fault tolerance; unsuitable for systems requiring operation below -40 °C or overvoltage resilience. | Select when cost sensitivity outweighs extended temperature or fault immunity requirements. |
| SN74LV4051AIPWR | Lower VCC range (2 V to 5.5 V), higher leakage (±100 nA vs ±1 μA), no AEC-Q100 qualification. | Not qualified for automotive use; limited to commercial/industrial ambient environments without thermal cycling stress. | Choose for 3.3 V-only systems where extended temperature range and injection protection are not required. |
Compared with CD74HC4051M96 and SN74LV4051AIPWR, the M74HC4851B1R uniquely combines -55 °C operation, 2000 V HBM ESD, and sub-mV injection-induced offset - making it the only option qualified for AEC-Q100 automotive signal routing where reliability under electrical fault is mandatory.
Availability
M74HC4851B1R is available at Aetrix Electronics and suitable for automotive cabin control, industrial sensor hubs, medical diagnostic interfaces, and test equipment signal routing requiring stable component supply across extended temperature ranges and high-reliability analog switching.
Supply support for M74HC4851B1R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The M74HC4851B1R belongs to ST's high-reliability analog switch portfolio, engineered specifically for fault-tolerant signal routing in automotive and industrial environments where overvoltage resilience and extended temperature operation are critical.
FAQ
Is M74HC4851B1R pin-compatible with CD4051BCN?
Yes - M74HC4851B1R uses identical SO-16 pinout and logic function mapping as CD4051BCN, including COM, INH, A/B/C select lines, and channel I/O pins 0–7. However, its C2MOS process delivers lower RON, faster switching, and superior injection current immunity compared to older CD40xx CMOS technology.
What is the maximum allowable voltage on analog inputs when the switch is off?
Analog inputs (pins 0–7) tolerate -0.5 V to VCC + 0.5 V when switched off, per absolute maximum ratings. With injection current protection active, signals up to VCC + 0.5 V on disabled channels induce ≤1 mV shift on the enabled COM path - enabling safe operation beyond standard rail-to-rail limits.
Does M74HC4851B1R support bidirectional analog signal flow?
Yes - the device is fully bidirectional: COM and channels 0–7 serve interchangeably as inputs or outputs depending on signal direction. This enables both multiplexing (multiple inputs → single COM) and demultiplexing (single COM → multiple outputs) without external reconfiguration.
Can M74HC4851B1R operate reliably at 2 V supply?
Yes - it is fully specified from 2 V to 6 V. At 2 V, propagation delay is 19.5 ns (typ.), RON is 500 Ω (typ.), and noise immunity remains at 28% VCC. This enables integration into ultra-low-voltage battery-powered systems while maintaining functional correctness.
M74HC4851B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- 8:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 195Ohm
- Channel-to-Channel Matching (ΔRon):
- 3Ohm
- Voltage - Supply, Single (V+):
- 2V ~ 6V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- 6.7pF, 22pF
- Current - Leakage (IS(off)) (Max):
- 100nA
- Crosstalk:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
M74HC4851B1R FAQ
1.How can I place an order for M74HC4851B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC4851B1R 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 M74HC4851B1R reliable?
The price and inventory of M74HC4851B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC4851B1R is usually 5 days.
3.What payment methods are accepted for M74HC4851B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC4851B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC4851B1R?
M74HC4851B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC4851B1R 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 M74HC4851B1R?
For technical support, including M74HC4851B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC4851B1R requirements.
6.How does Aetrix verify that M74HC4851B1R is sourced from the original manufacturer or authorized distributors?
All M74HC4851B1R 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 M74HC4851B1R meets industry standards.
7.What is the process for return or replacement of M74HC4851B1R?
All M74HC4851B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC4851B1R, 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 M74HC4851B1R part is unused and in its original packaging.
Return procedure for M74HC4851B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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