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onsemi MM74HC14SJX
- Part No.:
- MM74HC14SJX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MM74HC14SJX.pdf
- Description:
- IC INVERT SCHMITT 6CH 1INP 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
MM74HC14SJX from ON Semiconductor is a hex inverting Schmitt trigger IC designed for noise-immune signal conditioning and waveform shaping in digital logic interfaces. It features six independent gates, 13ns typical propagation delay at VCC = 4.5V, hysteresis voltage of 0.9V (typical), and operates across 2V–6V supply range - enabling use in mixed-voltage industrial control and low-power sensor interface circuits.
For engineers reviewing the MM74HC14SJX datasheet, pinout, applications, or equivalent options, key selection criteria include input hysteresis thresholds (VT+ = 2.7V, VT– = 1.8V at 4.5V), output drive capability (±4mA at 4.5V), wide temperature range (–55°C to +125°C), and SOIC-14 package compatibility with legacy 74LS footprint designs.
Technical Context
The MM74HC14SJX implements six independent CMOS Schmitt-trigger inverters using silicon-gate technology, delivering high noise immunity via built-in hysteresis (0.4V–1.5V depending on VCC). Each gate has symmetrical input threshold behavior with guaranteed VT+ and VT– separation across –55°C to +125°C.
It supports direct interfacing with LS-TTL loads (fanout of 10) while maintaining ultra-low quiescent current (≤20µA at 6V), and all inputs include diode clamps to VCC and GND for ESD protection - critical for robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - enables interoperability with 3.3V and 5V logic systems without level shifters |
| Propagation Delay (tPLH/tPHL) | 13ns typical at VCC = 4.5V, CL = 15pF - ensures timing predictability in clocked debounce and oscillator circuits |
| Hysteresis Voltage (VH) | 0.9V typical at VCC = 4.5V - provides reliable noise rejection for slow-rising or noisy switch inputs |
| Input Thresholds (VT+, VT–) | 2.7V / 1.8V min/max at VCC = 4.5V - defines clean switching windows for analog-to-digital signal conditioning |
| Output Drive Current | ±4.0mA at VCC = 4.5V - sufficient to directly drive LS-TTL inputs or small capacitive loads |
| Quiescent Supply Current (ICC) | 20µA maximum at VCC = 6V - supports battery-powered or energy-constrained applications |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive, industrial PLC, and outdoor equipment use |
Pinout & Package
MM74HC14SJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide - pin-compatible with industry-standard SOIC-14 footprints and mechanically distinct from TSSOP or PDIP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Input (A1–A6) | Individual Schmitt-trigger input pins - each accepts noisy or slow-slew signals and converts to clean digital edges |
| 2, 4, 6, 8, 10, 12 | Output (Y1–Y6) | Inverted, hysteresis-conditioned outputs - drive downstream logic or RC oscillator feedback paths |
| 7 | GND | Ground reference for all internal circuitry and I/O - must be low-impedance for stable hysteresis performance |
| 14 | VCC | Positive supply rail - powers all six gates; decoupling capacitor required near pin for AC noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Six independent Schmitt-trigger inverters | Enables simultaneous debouncing of multiple mechanical switches or sensor inputs without external components |
| Guaranteed hysteresis over full temperature range | Maintains consistent noise margin (≥0.4V) from –55°C to +125°C - eliminates false triggering in thermal cycling environments |
| 74LS pinout and functional compatibility | Direct drop-in replacement for obsolete 74LS14 in existing PCB layouts - no redesign needed |
| ESD-protected inputs with clamp diodes | Withstands ±20mA clamp current - protects against static discharge and transient overvoltage during handling or field operation |
| Low power CMOS architecture | Draws ≤20µA quiescent current at 6V - extends battery life in portable instrumentation and remote sensors |
Applications
| Switch Debounce Circuit | RC Relaxation Oscillator |
|---|---|
Use Scenario: Mechanical pushbutton or toggle switch interfacing with microcontroller GPIO. IC Role / Device Role / Timing Role: Signal conditioner that converts erratic contact bounce into clean, single-edge transitions. Use Value: Eliminates need for software debouncing or external RC + comparator circuits - reduces firmware complexity and BOM count. | Use Scenario: Generating precise low-frequency clock signals (e.g., 1–100kHz) for timing or LED blinking. IC Role / Device Role / Timing Role: Inverter-based relaxation oscillator core with external R/C network. Use Value: Achieves stable oscillation using only one MM74HC14SJX gate and two passive components - no crystal or dedicated timer IC required. |
| Level Translation Interface | Noise-Immune Sensor Interface |
Use Scenario: Connecting 3.3V microcontroller outputs to 5V legacy logic subsystems. IC Role / Device Role / Timing Role: Bidirectional voltage-level shifter leveraging Schmitt thresholds. Use Value: Tolerates slow-rising 3.3V signals while cleanly driving 5V logic - avoids metastability in mixed-supply systems. | Use Scenario: Conditioning output from thermistor-based voltage dividers or magnetic reed switches in factory automation. IC Role / Device Role / Timing Role: Analog front-end signal cleaner before ADC sampling or interrupt generation. Use Value: Rejects EMI-induced glitches on long sensor cables - improves system reliability without adding filtering hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex inverting Schmitt trigger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC14DR | Same 14-pin SOIC package; identical electrical specs except slightly higher max ICC (40µA vs 20µA at 6V) | Valid for commercial-temp (–40°C to +85°C) designs only - not rated for extended industrial range | Select when cost sensitivity outweighs extended temperature requirement and board space allows same footprint |
| 74AHC14PW,118 | Higher speed (tPD = 6.2ns typ at 5V); lower input capacitance (3.5pF); operates down to 2V but max VCC = 5.5V | Better suited for high-speed clock distribution or fast edge generation; unsuitable for 6V systems | Choose for timing-critical applications requiring sub-10ns delay and 5V-only operation |
Compared with SN74HC14DR and 74AHC14PW,118, the MM74HC14SJX uniquely supports –55°C to +125°C operation and 6V absolute max supply, making it the only option qualified for harsh-environment industrial control and automotive under-hood use cases where thermal stability and voltage headroom are non-negotiable.
Availability
MM74HC14SJX is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MM74HC14SJX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and discrete devices for automotive, industrial, and cloud infrastructure markets.
The MM74HC14SJX belongs to the 74HC logic family - engineered for high-noise immunity and low-power operation in industrial automation, motor control, and sensor signal conditioning applications where reliability under thermal stress is essential.
FAQ
What is the operating temperature range for MM74HC14SJX?
The MM74HC14SJX is specified for operation from –55°C to +125°C. This extended industrial temperature range is confirmed in the Recommended Operating Conditions table of the official ON Semiconductor datasheet (Rev. 2, August 2017), making MM74HC14SJX suitable for under-hood automotive, factory floor controllers, and outdoor-rated equipment where ambient extremes are expected.
Is MM74HC14SJX pin-compatible with the original 74LS14?
Yes, MM74HC14SJX is functionally and pinout compatible with the 74LS14. The connection diagram and ordering information confirm identical 14-pin SOP pin assignments, and the General Description explicitly states "The 74HC logic family is functionally and pinout compatible with the standard 74LS logic family." This allows direct replacement without PCB modification.
What is the typical hysteresis voltage of MM74HC14SJX at 4.5V supply?
The typical hysteresis voltage (VH) of MM74HC14SJX is 0.9V at VCC = 4.5V, as stated in the Features section and verified in the DC Electrical Characteristics table under VH parameter. This value represents the difference between VT+ (2.7V) and VT– (1.8V), ensuring robust noise rejection for slow or noisy input waveforms.
Does MM74HC14SJX require external pull-up resistors on its inputs?
No, MM74HC14SJX does not require external pull-up resistors. Its CMOS inputs have extremely low leakage (±1.0µA max), and internal protection diodes clamp to VCC and GND. Inputs left floating will not reliably hold a logic state, but intentional use with pull-ups is unnecessary unless interfacing with open-collector sources - unlike bipolar TTL, no DC bias current path is needed.
Can MM74HC14SJX drive LS-TTL loads directly?
Yes, MM74HC14SJX can drive up to 10 LS-TTL loads per output, as stated in the Features section. Its output drive strength (±4.0mA at VCC = 4.5V) meets LS-TTL input current requirements (IIL = –0.4mA, IIH = 20µA), and the datasheet confirms fanout of 10 LS-TTL loads - enabling direct interface without buffer stages in legacy system upgrades.
MM74HC14SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Inverter
- Number of Circuits:
- 6
- Number of Inputs:
- 1
- Features:
- Schmitt Trigger
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Input Logic Level - Low:
- 0.3V ~ 1.2V
- Input Logic Level - High:
- 1.5V ~ 4.2V
- Max Propagation Delay @ V, Max CL:
- 21ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOP
MM74HC14SJX FAQ
1.How can I place an order for MM74HC14SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for MM74HC14SJX 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 MM74HC14SJX reliable?
The price and inventory of MM74HC14SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HC14SJX is usually 5 days.
3.What payment methods are accepted for MM74HC14SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HC14SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM74HC14SJX?
MM74HC14SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM74HC14SJX 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 MM74HC14SJX?
For technical support, including MM74HC14SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HC14SJX requirements.
6.How does Aetrix verify that MM74HC14SJX is sourced from the original manufacturer or authorized distributors?
All MM74HC14SJX 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 MM74HC14SJX meets industry standards.
7.What is the process for return or replacement of MM74HC14SJX?
All MM74HC14SJX units undergo pre-shipment inspection (PSI). If there is an issue with MM74HC14SJX, 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 MM74HC14SJX part is unused and in its original packaging.
Return procedure for MM74HC14SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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