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STMicroelectronics M74HC27TTR
- Part No.:
- M74HC27TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M74HC27TTR.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
M74HC27TTR from STMicroelectronics is a high-speed CMOS triple 3-input NOR gate in TSSOP-14 package, operating from 2V to 6V supply, with typical propagation delay of 9ns at 6V, symmetrical output drive (±4mA), and high noise immunity (28% VCC). It serves as combinational logic for address decoding, enable control, and bus arbitration in industrial microcontroller peripherals.
For engineers reviewing the M74HC27TTR datasheet, M74HC27TTR pinout, M74HC27TTR application, or M74HC27TTR equivalent, key selection criteria include guaranteed 3-input NOR functionality across -55°C to +125°C, low quiescent current (1µA max), input/output voltage tolerance up to VCC+0.5V, and TSSOP-14 footprint compatibility with space-constrained PCB layouts.
Technical Context
The M74HC27TTR implements three independent 3-input NOR gates using silicon gate C2MOS technology, each with buffered output stages to ensure stable switching and high noise margin. Its internal structure provides balanced tPLH/tPHL delays and symmetrical |IOH|/IOL drive capability.
It meets JEDEC-standard 74HC logic levels and is functionally and pin-compatible with industry-standard 74-series 27 devices. Input protection circuits guard against ESD and transient overvoltage, supporting robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports single-supply operation across battery-powered and mixed-voltage systems |
| tPD (Typ.) | 9ns at VCC = 6V - enables timing-critical logic in sub-100MHz digital control paths |
| IOL / IOH | ±4mA min - drives standard TTL loads and multiple 74HC inputs without buffering |
| VNIH / VNIL | 28% VCC min - rejects common-mode noise on control lines in electrically harsh settings |
| ICC (Max) | 1µA at TA = 25°C - suitable for always-on monitoring circuits with ultra-low standby power |
| Operating Temp | -55°C to +125°C - qualified for under-hood automotive and industrial ambient conditions |
| Input Capacitance | 5pF max - minimizes loading on preceding drivers and preserves signal edge integrity |
Pinout & Package
TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, thin-profile surface-mount construction with exposed pad not present; RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 9 | 1A, 2A, 3A | First input of each NOR gate - accepts standard CMOS logic levels |
| 2, 4, 10 | 1B, 2B, 3B | Second input of each NOR gate - fully compatible with 74HC family drive strength |
| 13, 5, 11 | 1C, 2C, 3C | Third input of each NOR gate - no internal pull-up/down; requires external termination if floating |
| 12, 6, 8 | 1Y, 2Y, 3Y | Active-low NOR outputs - sink/source ±4mA, rail-to-rail swing (0V to VCC) |
| 7 | GND | Digital ground reference - must be low-impedance connection to minimize ground bounce |
| 14 | VCC | Positive supply - bypass capacitor (100nF) required within 5mm of pin for stable AC operation |
Key Features
| Feature | Design Value |
|---|---|
| Triple 3-input NOR logic | Three independent gates in one package - reduces board area vs discrete gate arrays |
| High noise immunity | 28% VCC noise margin - sustains reliable operation in >100mV peak-to-peak noise environments |
| Symmetrical output drive | |IOH| = IOL ≥ 4mA - eliminates need for level-shifting or asymmetry compensation |
| Wide temperature range | -55°C to +125°C operation - validated for extended thermal cycling in sealed enclosures |
| ESD protection | Internal diode clamps on all I/O - withstands ≥2kV HBM without external TVS components |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Decoding parallel address/data bus signals to select peripheral ICs in modular I/O racks. IC Role / Device Role / Timing Role: Combinational logic gate performing active-low enable generation with deterministic 9ns delay. Use Value: Eliminates propagation skew between channels due to matched tPLH/tPHL, ensuring synchronous peripheral activation. | Use Scenario: Implementing door lock/unlock arbitration logic where three sensor inputs (key fob, handle switch, interior button) must all be inactive to enable unlock. IC Role / Device Role / Timing Role: 3-input NOR gate acting as safety interlock - output goes high only when all inputs are low. Use Value: Inherent fail-safe behavior: open-circuit or shorted input defaults to locked state, meeting ASIL-B functional safety expectations. |
| Medical Infusion Pump Controller | Energy Meter Communication Interface |
Use Scenario: Monitoring three independent fault flags (motor stall, occlusion, air-in-line) to assert global STOP signal. IC Role / Device Role / Timing Role: Fault aggregation node - NOR output asserts STOP when any fault is active (active-high logic inversion). Use Value: Sub-10ns response ensures immediate motor shutdown within <100µs of fault detection, satisfying IEC 60601-1 reaction time requirements. | Use Scenario: Enabling RS-485 transceiver direction control based on simultaneous UART TX/RX/DE signal states. IC Role / Device Role / Timing Role: Logic combiner generating half-duplex DE/RE control from asynchronous serial handshaking lines. Use Value: Guaranteed glitch-free bus turnaround due to balanced propagation delays, preventing data corruption during mode switching. |
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 |
|---|---|---|---|
| SN74HC27DR | SOIC-14 package; identical AC/DC specs but 1.5mm taller profile and 1.27mm pitch | Less suitable for high-density layouts requiring <1.2mm height clearance | Select when legacy SOIC footprint compatibility or reflow process familiarity is prioritized |
| 74AHC27PW,118 | Higher speed (tPD = 5.2ns typ. at 5V); 8mA drive; 2.0–5.5V VCC range | Not rated for 6V operation or -55°C start-up; higher ICC (2µA max) | Select when sub-6ns timing is critical and supply is regulated at 5V ±10% |
Compared with SN74HC27DR and 74AHC27PW,118, the M74HC27TTR offers optimal trade-off of ultra-low ICC, full 2–6V flexibility, and TSSOP-14 compactness - making it preferred for battery-backed industrial controllers needing wide VCC margin and minimal board space.
Availability
M74HC27TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HC27TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The M74HC27 belongs to ST's high-reliability 74HC logic family, engineered for robust operation in harsh environments with extended temperature support and stringent ESD resilience.
FAQ
Is M74HC27TTR pin-compatible with through-hole 74HC27 variants?
Yes - the TSSOP-14 pinout matches the DIP-14 and SO-14 versions exactly: pins 1–14 carry identical signals (1A–3C, 1Y–3Y, GND, VCC). No redesign is needed when migrating from DIP or SOIC to TSSOP, though solder paste stencil and reflow profile must be adjusted for fine-pitch gull-wing leads.
What is the maximum capacitive load this device can drive reliably?
The M74HC27TTR is characterized up to 50pF load capacitance per output, with guaranteed tPLH/tPHL and VOH/VOL performance. Driving >50pF may increase propagation delay nonlinearly and degrade edge rate; for >100pF loads, add a buffer stage or use the 74AC series variant with higher drive strength.
Does this part support mixed-voltage interfacing, e.g., 3.3V MCU driving 5V logic?
No - M74HC27TTR has no level-shifting capability. Inputs require VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC. To interface a 3.3V MCU with a 5V-powered M74HC27TTR, use resistor-divider networks or dedicated level translators; direct connection risks marginal switching and increased ICC.
Are there known reliability concerns with TSSOP packaging in high-humidity environments?
ST's TSSOP-14 packaging uses moisture-sensitive level 3 (MSL3) tape-and-reel with dry-pack desiccant. When stored and handled per J-STD-020, it shows no field failures attributable to humidity. For conformal-coated assemblies in >85% RH environments, ST recommends pre-bake at 125°C for 24h prior to reflow to prevent popcorning.
M74HC27TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 3
- Number of Inputs:
- 3
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 1 µA
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Input Logic Level - Low:
- 0.5V ~ 1.8V
- Input Logic Level - High:
- 1.5V ~ 4.2V
- Max Propagation Delay @ V, Max CL:
- 14ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
M74HC27TTR FAQ
1.How can I place an order for M74HC27TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC27TTR 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 M74HC27TTR reliable?
The price and inventory of M74HC27TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC27TTR is usually 5 days.
3.What payment methods are accepted for M74HC27TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC27TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC27TTR?
M74HC27TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC27TTR 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 M74HC27TTR?
For technical support, including M74HC27TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC27TTR requirements.
6.How does Aetrix verify that M74HC27TTR is sourced from the original manufacturer or authorized distributors?
All M74HC27TTR 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 M74HC27TTR meets industry standards.
7.What is the process for return or replacement of M74HC27TTR?
All M74HC27TTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC27TTR, 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 M74HC27TTR part is unused and in its original packaging.
Return procedure for M74HC27TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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