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Renesas 74FCT157CTQG8
- Part No.:
- 74FCT157CTQG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT157CTQG8.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
74FCT157CTQG8 from Renesas Electronics (formerly IDT) is a FAST CMOS quad 2-input multiplexer with true TTL input/output compatibility, 48mA sink and –15mA source drive, and industrial temperature range (–40°C to +85°C). It selects four bits of data from two sources using a common select input and outputs true (non-inverting) logic levels, commonly used in bus multiplexing and function generation.
For engineers reviewing the 74FCT157CTQG8 datasheet, 74FCT157CTQG8 pinout, 74FCT157CTQG8 application, or 74FCT157CTQG8 equivalent, key selection criteria include its active-low enable, high-drive outputs, JEDEC 18 compliance, live-insertion capability, and QSOP-16 packaging for space-constrained industrial control and legacy system upgrades.
Technical Context
The 74FCT157CTQG8 implements four independent 2:1 multiplexers sharing one common select (S) and one active-low enable (E) input. Each channel routes either I0x or I1x to output Zx based on S and E states, with all outputs forced low when E is high.
It uses advanced dual-metal CMOS technology to achieve TTL-compatible voltage thresholds (VIH = 2.0V min, VIL = 0.8V max), low leakage (≤1µA), and fast propagation delays (tPLH/tPHL ≤ 4.4ns at CL = 50pF, RL = 500Ω), meeting JEDEC Standard 18 for interoperability with legacy TTL systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0V ±5% - fixed single-rail operation compatible with standard TTL/CMOS logic domains |
| Propagation Delay | ≤4.4ns (max) - enables reliable operation in high-speed address/data routing up to ~100MHz system timing |
| Output Drive | IOL = 48mA / IOH = –15mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Input Leakage | ≤1µA (max) - ensures stable logic levels in low-power standby and hot-swap scenarios |
| Operating Temp | –40°C to +85°C - qualified for industrial automation, motor control, and embedded instrumentation |
| JEDEC Compliance | Meets JEDEC Std 18 - guarantees interoperability with industry-standard TTL and FCT-family components |
Pinout & Package
74FCT157CTQG8 is housed in a 16-pin Quarter-size Small Outline Package (QSOP), 0.150" body width, gull-wing leads, RoHS-compliant green finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select Input | Common 2:1 selector controlling all four mux channels; HIGH selects I1x, LOW selects I0x |
| 2 (I0A) | Data Input 0, Channel A | First source input for channel A; referenced to GND/VCC logic thresholds |
| 3 (GND) | Ground Reference | Primary return path for all internal logic and output drivers |
| 4 (ZB) | Output B | Non-inverting buffered output for channel B; driven low when E = HIGH |
| 5 (I0B) | Data Input 0, Channel B | First source input for channel B; electrically identical to I0A–I0D |
| 6 (I1B) | Data Input 1, Channel B | Second source input for channel B; paired with I0B under S control |
| 7 (I1A) | Data Input 1, Channel A | Second source input for channel A; routed to ZA when S = HIGH and E = LOW |
| 8 (E) | Enable Input (Active LOW) | Global enable: LOW activates outputs, HIGH forces all Zx = LOW (not high-Z) |
| 9 (I0C) | Data Input 0, Channel C | First source input for channel C; part of four parallel 2:1 paths |
| 10 (I1C) | Data Input 1, Channel C | Second source input for channel C; synchronized with S and E |
| 11 (ZC) | Output C | True-level output for channel C; no inversion or delay beyond spec'd tPLH/tPHL |
| 12 (I0D) | Data Input 0, Channel D | First source input for channel D; matches pinout symmetry of SOIC variant |
| 13 (I1D) | Data Input 1, Channel D | Second source input for channel D; completes quad configuration |
| 14 (ZD) | Output D | Final non-inverting output; shares same drive strength and timing as ZA–ZC |
| 15 (VCC) | Power Supply | +5V supply rail; powers all logic and output stages; decoupling required per layout guidelines |
| 16 (ZA) | Output A | Primary output for channel A; asserted only when E = LOW and S selects corresponding I0x/I1x |
Key Features
| Feature | Design Value |
|---|---|
| True TTL input compatibility | VIH ≥ 2.0V and VIL ≤ 0.8V - eliminates level-shifting when interfacing with legacy 74LS/74ALS systems |
| High-current outputs | 48mA sink / –15mA source - directly drives 10+ TTL loads or long PCB traces without fanout buffers |
| Live insertion support | Power-off disable outputs - prevents back-driving during hot-plug operations in modular backplane systems |
| Low quiescent current | ICC ≤ 1mA (max) - reduces static power in always-on industrial controllers and power-sensitive modules |
| Industrial temperature rating | –40°C to +85°C operation - validated for use in motor drives, PLC I/O modules, and outdoor telecom equipment |
Applications
| Bus Multiplexing | Function Generation |
|---|---|
Use Scenario: Selecting between two 4-bit register banks (e.g., accumulator vs. temporary storage) to feed a shared ALU input bus. IC Role / Device Role / Timing Role: Quad 2:1 data selector synchronizing four parallel bit paths with single-cycle latency and no added clock skew. Use Value: Reduces PCB trace count by 50% versus discrete gating; maintains signal integrity via matched propagation delays across all channels. | Use Scenario: Implementing combinational logic functions (e.g., XOR, AND, OR) using two control variables in embedded test pattern generators. IC Role / Device Role / Timing Role: Configurable logic block generating any of 16 possible 2-variable Boolean functions with one shared variable. Use Value: Eliminates need for dedicated PLD or gate arrays in low-complexity digital subsystems, lowering BOM cost and board area. |
| Legacy System Upgrade | Industrial I/O Expansion |
Use Scenario: Replacing obsolete 74LS157 in aging CNC controller boards where footprint and pinout must match exactly. IC Role / Device Role / Timing Role: Drop-in functional and pin-compatible upgrade delivering higher noise immunity and lower power than bipolar TTL. Use Value: Extends service life of fielded equipment without redesign; supports longer-term component availability than original LS family. | Use Scenario: Routing sensor data (temperature, pressure, position) from multiple analog front-ends to a shared ADC input in programmable logic controllers. IC Role / Device Role / Timing Role: Signal selector enabling time-division sampling of up to eight analog channels via two 74FCT157CTQG8 devices. Use Value: Provides deterministic, glitch-free channel switching with sub-5ns transition timing-critical for accurate multi-channel acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT157ATQG8 | Same architecture and pinout; rated for –40°C to +85°C but with tighter propagation delay (≤3.9ns max) and lower ICC (≤0.5mA max) | Preferred for timing-critical designs requiring minimal skew and lowest static power | Select when system-level timing margin is <1ns or standby current must be minimized |
| 74FCT157DTQG8 | Same architecture and pinout; extended temperature grade (–40°C to +125°C) with identical AC/DC specs except higher ICC (≤2mA max) | Suitable for under-hood automotive or high-ambient industrial environments exceeding +85°C | Select when operating ambient exceeds +85°C and full industrial qualification is insufficient |
Compared with 74FCT157ATQG8 and 74FCT157DTQG8, the 74FCT157CTQG8 offers balanced performance: mid-range propagation delay (≤4.4ns), moderate ICC (≤1mA), and standard industrial temperature coverage-making it optimal for cost-sensitive, volume-deployed control systems where extreme speed or extended temp is unnecessary.
Availability
74FCT157CTQG8 is available at Aetrix Electronics and suitable for industrial automation, legacy system repair, and embedded instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for 74FCT157CTQG8 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
Renesas Electronics Corporation is a global semiconductor leader formed through the integration of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and timing solutions.
The 74FCT157CTQG8 belongs to the IDT FCT logic family, designed specifically for high-speed, low-power, TTL-compatible digital interfacing in industrial and communications infrastructure equipment.
FAQ
What is the operating voltage range for the 74FCT157CTQG8?
The 74FCT157CTQG8 operates at a nominal VCC of 5.0V ±5%, meaning its valid supply range is 4.75V to 5.25V. This fixed single-rail requirement ensures compatibility with standard TTL logic families and avoids the need for voltage translation. Operation outside this range may cause incorrect logic states or damage. The 74FCT157CTQG8 does not support 3.3V or mixed-voltage operation.
Does the 74FCT157CTQG8 have high-impedance outputs when disabled?
No, the 74FCT157CTQG8 does not enter high-impedance mode when disabled. When the active-low enable (E) input is HIGH, all four outputs (ZA–ZD) are actively driven LOW-not tri-stated. This behavior differs from some multiplexers with three-state outputs and must be accounted for in bus-sharing designs to avoid contention. The 74FCT157CTQG8's disable state is a hard logic LOW, not an open circuit.
Is the 74FCT157CTQG8 pin-compatible with the 74LS157?
Yes, the 74FCT157CTQG8 is pin-compatible and functionally equivalent to the 74LS157 in QSOP-16 packaging, including identical pin assignments for I0A–I0D, I1A–I1D, S, E, ZA–ZD, VCC, and GND. This allows direct replacement in legacy designs without PCB modification, while providing improved noise immunity, lower power, and higher drive strength compared to the bipolar 74LS157.
What is the maximum clock/data toggle frequency supported by the 74FCT157CTQG8?
The 74FCT157CTQG8 has no internal clock; it is asynchronous. Its usable data rate depends on propagation delay and load. With tPLH/tPHL ≤ 4.4ns and CL = 50pF, it reliably handles input transitions up to ~100MHz in point-to-point routing. System-level maximum toggle frequency is governed by board layout, termination, and fanout-not device limits. The 74FCT157CTQG8 itself imposes no minimum pulse width or maximum toggle rate beyond AC timing specifications.
Where can I find the thermal characteristics and package dimensions for the 74FCT157CTQG8?
Thermal resistance (θJA) and mechanical drawings for the QSOP-16 package of the 74FCT157CTQG8 are published in Renesas' official package outline document PS0070-A (QSOP-16, 0.150" body). θJA is typically 120°C/W for standard JEDEC 2-layer board conditions. Full dimensional data-including lead pitch (0.025"), body width (0.150"), and overall length (0.200")-is available in that document, not in the 74FCT157CTQG8 datasheet itself.
74FCT157CTQG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 15mA, 48mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
74FCT157CTQG8 FAQ
1.How can I place an order for 74FCT157CTQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT157CTQG8 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 74FCT157CTQG8 reliable?
The price and inventory of 74FCT157CTQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT157CTQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT157CTQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT157CTQG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT157CTQG8?
74FCT157CTQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT157CTQG8 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 74FCT157CTQG8?
For technical support, including 74FCT157CTQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT157CTQG8 requirements.
6.How does Aetrix verify that 74FCT157CTQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT157CTQG8 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 74FCT157CTQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT157CTQG8?
All 74FCT157CTQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT157CTQG8, 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 74FCT157CTQG8 part is unused and in its original packaging.
Return procedure for 74FCT157CTQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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