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onsemi 74VHC27SJX
- Part No.:
- 74VHC27SJX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74VHC27SJX.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
74VHC27SJX from Fairchild Semiconductor is a triple 3-input NOR gate in a 14-lead SOP (EIAJ TYPE II, 5.3mm wide) package, operating at 2.0–5.5V supply voltage with 4.1ns typical propagation delay at 5V and ±8mA output drive capability. It provides high noise immunity (28% VCC min), input protection for 0–7V input tolerance, and power-down input protection - used in logic-level translation between 3V/5V systems and battery-backup interfaces.
For engineers reviewing the 74VHC27SJX datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3V/5V dual-supply compatibility, low 2µA max ICC quiescent current, guaranteed VOL ≤0.44V at 8mA load, and EIAJ TYPE II SOP footprint for space-constrained digital control boards.
Technical Context
The 74VHC27SJX implements three independent 3-input NOR gates using silicon-gate CMOS technology, achieving TTL-compatible speed while maintaining CMOS power efficiency. Its three-stage buffered output architecture ensures stable switching and high noise rejection across temperature (–40°C to +85°C).
All inputs feature overvoltage-tolerant protection enabling safe interfacing between mismatched supply domains (e.g., 5V logic driving 3V microcontrollers). Unused inputs must be tied HIGH or LOW per design specification - floating inputs are prohibited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0V to 5.5V - supports mixed-voltage system interconnect including 3.3V and 5V logic rails |
| Propagation Delay | 4.1ns (typ) at VCC = 5.0V, CL = 15pF - enables use in high-speed control timing paths up to ~200MHz toggle rate |
| Output Drive | ±8mA - sufficient to directly drive multiple 74-series inputs or small LEDs without external buffers |
| Input Voltage Range | –0.5V to +7.0V - allows safe operation with inputs exceeding VCC, critical for hot-swap and backup-power scenarios |
| Quiescent ICC | 2µA (max) at TA = 25°C - enables ultra-low-power standby in battery-operated control logic |
| Noise Immunity | VNIH/VNIL ≥ 28% VCC (min) - rejects transient coupling in noisy industrial PCB environments |
Pinout & Package
74VHC27SJX uses a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide body, with standard 1.27mm lead pitch and JEDEC-compliant land pattern SOP65P640X110-14M.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Gate 1 Inputs (A1, B1, C1) | Three independent logic inputs for first NOR gate; all tolerate 0–7V regardless of VCC |
| 4 | Gate 1 Output (Y1) | Inverted OR of A1+B1+C1; drives loads up to ±8mA with VOL ≤0.44V |
| 5, 6, 7 | Gate 2 Inputs (A2, B2, C2) | Inputs for second independent NOR function; identical electrical behavior to Pin 1–3 |
| 8 | GND | Ground reference for all logic and power domains; required for proper noise margin and ESD protection |
| 9, 10, 11 | Gate 3 Inputs (A3, B3, C3) | Third set of 3-input NOR inputs; fully decoupled from other gates electrically |
| 12 | Gate 3 Output (Y3) | Output of third NOR gate; shares same DC/AC specs as Y1 and Y2 |
| 13 | VCC | Positive supply rail (2.0–5.5V); powers all three gates and internal protection circuitry |
| 14 | Gate 2 Output (Y2) | Second NOR output; pin-compatible placement with industry-standard 74xx27 layout |
Key Features
| Feature | Design Value |
|---|---|
| 3.3V/5V Dual-Rail Compatibility | Operates correctly across 2.0–5.5V supply range and accepts inputs up to 7V - eliminates level shifters in mixed-voltage designs |
| Overvoltage-Tolerant Inputs | Input protection circuit enables 0–7V input application independent of VCC - prevents latch-up during power sequencing or backup switchover |
| Low Dynamic Noise | VOLP ≤0.8V (max) at CL = 50pF - reduces crosstalk in dense logic layouts and improves signal integrity on shared PCB traces |
| Power-Down Input Protection | Inputs remain protected even when VCC = 0V - safeguards against back-driving damage during partial power-down states |
| PIN-to-PIN Compatibility | Functionally and physically compatible with 74HC27 - enables drop-in replacement in existing HC-based designs without layout change |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Adding discrete logic for sensor status aggregation and fault masking in modular I/O racks. IC Role / Device Role / Timing Role: NOR gate performing active-low wired-OR fault signaling across 3 sensor channels per gate. Use Value: Enables single-pin fault reporting with guaranteed 4.1ns response and 28% noise margin - reducing FPGA GPIO usage by 66%. |
Use Scenario: Interfacing legacy 5V switch inputs to 3.3V microcontroller in door module ECUs. IC Role / Device Role / Timing Role: Level-translating and debouncing logic element converting mechanical switch closures into clean MCU interrupts. Use Value: Eliminates external resistors and Schottky diodes via 0–7V input tolerance and integrated protection - cuts BOM cost by $0.12/unit. |
| Battery-Backed Real-Time Clock Interface | Legacy System Bus Glue Logic |
Use Scenario: Managing clock enable/disable and backup power arbitration between main and coin-cell supplies. IC Role / Device Role / Timing Role: NOR-based priority encoder selecting active clock source based on VCC and backup voltage presence. Use Value: Prevents clock glitches during brown-out transitions using power-down protected inputs - ensures RTC continuity across 100k+ power cycles. |
Use Scenario: Adapting address decode logic between ISA-style peripherals and modern microcontrollers. IC Role / Device Role / Timing Role: Combinational glue logic generating chip-select signals from partial address bits and control strobes. Use Value: Delivers sub-5ns propagation with <2µA static draw - extends sleep-mode battery life in portable test equipment by 18% vs. HC variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC27D,653 (Nexperia) | Slower tPD = 18ns (typ) at 6V; higher ICC = 4µA (max); no 7V input tolerance | Limited to single-supply 4.5–6V systems; requires external clamping for >VCC inputs | Select when cost is primary and mixed-voltage operation is not required |
| SN74LVC27APWR (TI) | Wider VCC = 1.65–5.5V; lower VOL = 0.55V (max) at 24mA; 3.3V-optimized I/O thresholds | Better suited for 1.8V/3.3V-only systems; lacks 7V input rating for 5V-tolerant interfacing | Select for LVTTL/LVCMOS systems where 5V tolerance is unnecessary and higher drive is needed |
Compared with 74HC27D and SN74LVC27APWR, the 74VHC27SJX uniquely balances 5V-tolerant interfacing, sub-5ns speed, and µA-level quiescent current - making it optimal for legacy-to-modern voltage bridging in industrial and automotive control logic where reliability under supply mismatch is critical.
Availability
74VHC27SJX is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and battery-backed real-time clock interfaces requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for 74VHC27SJX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and logic devices before its acquisition by ON Semiconductor in 2016.
The 74VHC27SJX belongs to the VHC (Very High Speed CMOS) logic family, designed specifically for applications needing TTL-equivalent speed with CMOS power efficiency and robust input protection in mixed-voltage embedded systems.
FAQ
What supply voltage range does the 74VHC27SJX support?
The 74VHC27SJX operates across a 2.0V to 5.5V supply range, enabling direct use in both 3.3V and 5V logic systems. Its internal design maintains specified AC and DC performance across this full range, including propagation delay, output drive, and noise margins - verified per the Rev. 1.4.0 datasheet under recommended operating conditions.
Can inputs of the 74VHC27SJX safely exceed VCC?
Yes - the 74VHC27SJX features overvoltage-tolerant inputs rated for –0.5V to +7.0V, independent of VCC. This allows safe interfacing with higher-voltage signals (e.g., 5V outputs driving a 3.3V-powered 74VHC27SJX), eliminating external clamping components and preventing damage during power sequencing mismatches.
Is the 74VHC27SJX pin-compatible with the 74HC27?
Yes - the 74VHC27SJX is pin and function compatible with the 74HC27, sharing identical pinout, logic function, and package outline (14-lead SOP). This enables direct replacement in existing 74HC27 designs without PCB modification, while delivering improved speed (4.1ns vs. ~18ns) and enhanced input protection.
What is the maximum output current drive capability of the 74VHC27SJX?
The 74VHC27SJX delivers ±8mA output current per gate at VCC = 4.5V, with VOL ≤0.44V and VOH ≥3.80V under those conditions. This allows direct driving of multiple 74-series inputs or small indicator loads, reducing need for external buffer stages in compact control logic implementations.
Does the 74VHC27SJX require pull-up or pull-down resistors on unused inputs?
Yes - per the datasheet's Recommended Operating Conditions, all unused inputs on the 74VHC27SJX must be held HIGH or LOW; floating inputs are strictly prohibited. This prevents increased ICC, erratic switching, and potential device malfunction due to undefined logic states at internal gate nodes.
74VHC27SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 3
- Number of Inputs:
- 3
- Features:
- -
- Voltage - Supply:
- 2V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 8mA, 8mA
- Input Logic Level - Low:
- 0.5V
- Input Logic Level - High:
- 1.5V
- Max Propagation Delay @ V, Max CL:
- 7.9ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOP
74VHC27SJX FAQ
1.How can I place an order for 74VHC27SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC27SJX 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 74VHC27SJX reliable?
The price and inventory of 74VHC27SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC27SJX is usually 5 days.
3.What payment methods are accepted for 74VHC27SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC27SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC27SJX?
74VHC27SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC27SJX 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 74VHC27SJX?
For technical support, including 74VHC27SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC27SJX requirements.
6.How does Aetrix verify that 74VHC27SJX is sourced from the original manufacturer or authorized distributors?
All 74VHC27SJX 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 74VHC27SJX meets industry standards.
7.What is the process for return or replacement of 74VHC27SJX?
All 74VHC27SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC27SJX, 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 74VHC27SJX part is unused and in its original packaging.
Return procedure for 74VHC27SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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