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Renesas 74FCT157ATQG
- Part No.:
- 74FCT157ATQG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT157ATQG.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
74FCT157ATQG from Renesas Electronics (formerly IDT) is a FAST CMOS quad 2-input multiplexer with true TTL input/output compatibility, industrial temperature range (–40°C to +85°C), 5V supply, and QSOP-16 package. It features active-low enable (E), common select (S), four independent 2:1 data paths (I0A–I0D/I1A–I1D → ZA–ZD), and high-drive outputs (–15mA IOH, 48mA IOL). It is used in bus selection, register-to-bus data routing, and combinational logic generation.
For engineers reviewing the 74FCT157ATQG datasheet, 74FCT157ATQG pinout, 74FCT157ATQG application, or 74FCT157ATQG equivalent, key selection considerations include its TTL-compatible voltage thresholds (VIH = 2.0V min, VIL = 0.8V max), low leakage (≤1µA), propagation delay (tPLH/tPHL ≤ 5ns at CL = 50pF), and live-insertion support via power-off disable outputs.
Technical Context
The 74FCT157ATQG implements four independent 2:1 multiplexers sharing one active-low enable (E) and one select (S) input. Each channel selects between I0x and I1x to drive Zx in true (non-inverting) output form. All outputs are forced low when E is HIGH.
It uses advanced dual-metal CMOS technology to achieve TTL-compatible input thresholds and high-current drive while maintaining CMOS power efficiency. The device meets JEDEC Standard 18, supports live insertion, and operates across full industrial voltage (4.75V–5.25V) and temperature (–40°C to +85°C) ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75V to 5.25V - Ensures robust operation under noisy 5V rail conditions typical in industrial control systems. |
| tPLH / tPHL | ≤5ns (CL = 50pF, RL = 500Ω) - Enables reliable timing in high-speed address/data bus switching up to ~100MHz system clock domains. |
| IOH / IOL | –15mA / +48mA - Drives multiple TTL loads directly without buffers; supports fan-out of ≥10 standard TTL inputs. |
| VIH / VIL | 2.0V min / 0.8V max - Guarantees interoperability with legacy 5V TTL logic families without level-shifting. |
| ICC (Quiescent) | 1mA max - Minimizes static power draw in always-on industrial monitoring subsystems. |
| Input Leakage | ±1µA max - Prevents signal integrity degradation in high-impedance analog-digital interface circuits. |
Pinout & Package
74FCT157ATQG 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 for all four channels; LOW routes I0x, HIGH routes I1x to outputs ZA–ZD. |
| 2 (I0A) | Data Input A, Source 0 | First bit of first data source; routed to ZA when S = LOW and E = LOW. |
| 3 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; must be low-impedance for noise immunity. |
| 4 (ZB) | Output B | Non-inverting buffered output for channel B; driven LOW when E = HIGH (disable state). |
| 5 (I0B) | Data Input B, Source 0 | Second bit of first data source; routed to ZB when S = LOW and E = LOW. |
| 6 (I1B) | Data Input B, Source 1 | Second bit of second data source; routed to ZB when S = HIGH and E = LOW. |
| 7 (I1A) | Data Input A, Source 1 | First bit of second data source; routed to ZA when S = HIGH and E = LOW. |
| 8 (E) | Enable Input (Active LOW) | Global enable; outputs ZA–ZD go LOW when E = HIGH, enabling safe bus isolation during hot-swap. |
| 9 (I0C) | Data Input C, Source 0 | Third bit of first data source; routed to ZC when S = LOW and E = LOW. |
| 10 (I1C) | Data Input C, Source 1 | Third bit of second data source; routed to ZC when S = HIGH and E = LOW. |
| 11 (ZC) | Output C | Non-inverting buffered output for channel C; exhibits same timing and drive as ZA/ZB/ZD. |
| 12 (I0D) | Data Input D, Source 0 | Fourth bit of first data source; routed to ZD when S = LOW and E = LOW. |
| 13 (I1D) | Data Input D, Source 1 | Fourth bit of second data source; routed to ZD when S = HIGH and E = LOW. |
| 14 (ZD) | Output D | Non-inverting buffered output for channel D; supports simultaneous 4-bit bus transfer. |
| 15 (VCC) | Power Supply | +5V supply pin; requires local 0.1µF ceramic decoupling adjacent to pin for stable high-speed switching. |
| 16 (ZA) | Output A | Non-inverting buffered output for channel A; primary interface point for first data bit in bus applications. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible I/O thresholds | VIH ≥ 2.0V and VIL ≤ 0.8V ensure seamless integration with legacy 5V TTL systems without external level shifters. |
| High-output drive capability | 48mA sink current allows direct driving of multiple TTL inputs or LED indicators without external buffers. |
| Live-insertion support | Power-off disable outputs (IOFF ≤ ±1µA at VCC = 0V) prevent back-driving and bus contention during hot-plug events. |
| Low quiescent current | 1mA max ICC enables use in power-constrained industrial modules where standby current impacts thermal design. |
| JEDEC Std 18 compliance | Guarantees interoperability with industry-standard 5V logic families and PCB layout practices for mixed-technology designs. |
Applications
| Bus Selection | Register File Multiplexing |
|---|---|
|
Use Scenario: Selecting between two 4-bit data buses (e.g., CPU ALU output vs. memory read data) feeding a shared arithmetic unit input. IC Role / Device Role / Timing Role: Quad 2:1 data selector synchronizing 4-bit parallel paths with sub-5ns propagation delay and common control (S/E). Use Value: Eliminates need for four discrete 2:1 mux ICs or complex PLD logic, reducing component count and board area by >60%. |
Use Scenario: Routing data from two banks of 4-bit registers (e.g., accumulator vs. temporary register set) to a common ALU input port. IC Role / Device Role / Timing Role: High-fanout, low-skew multiplexer providing simultaneous 4-bit selection with matched trace-length timing. Use Value: Enables deterministic register-to-ALU latency critical for real-time microcontroller instruction execution pipelines. |
| Function Generation | Industrial I/O Expansion |
|
Use Scenario: Implementing arbitrary 2-variable Boolean functions (e.g., AND, OR, XOR, NAND) in programmable logic controllers using fixed hardware. IC Role / Device Role / Timing Role: Combinational logic generator mapping two control variables (S and E) to four function outputs (ZA–ZD). Use Value: Reduces FPGA gate usage or eliminates need for small CPLDs in cost-sensitive PLC I/O modules. |
Use Scenario: Consolidating sensor/actuator signals from two redundant I/O modules onto a single diagnostic bus in factory automation systems. IC Role / Device Role / Timing Role: Fault-tolerant signal selector enabling automatic switchover between primary and backup I/O paths. Use Value: Supports fail-safe operation with <100ns switchover time and no external glue logic required. |
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 |
|---|---|---|---|
| SN74F157N | Same logic function and pinout; higher ICC (10mA typ), slower tPLH/tPHL (11ns max), no live-insertion support. | Limited to non-hot-swap legacy systems; unsuitable for modular industrial backplanes requiring power sequencing. | Choose SN74F157N only if cost is primary constraint and live insertion or low power is not required. |
| 74ACT157SCX | Higher VCC range (4.5–5.5V), lower ICC (0.5mA max), but no guaranteed IOFF spec for live insertion. | Better for battery-powered portable test equipment; lacks formal JEDEC Std 18 compliance for industrial deployment. | Prefer 74ACT157SCX for portable instrumentation where ultra-low static power outweighs hot-swap assurance. |
Compared with SN74F157N and 74ACT157SCX, the 74FCT157ATQG uniquely combines JEDEC Std 18 compliance, live-insertion capability, and industrial-grade reliability-making it the only choice for mission-critical hot-swappable backplane architectures.
Availability
74FCT157ATQG is available at Aetrix Electronics and suitable for industrial control systems, programmable logic controllers, and factory automation equipment requiring stable component supply and long-term lifecycle support.
Supply support for 74FCT157ATQG 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and infrastructure markets.
The 74FCT157ATQG belongs to Renesas' legacy IDT logic family, designed specifically for high-reliability 5V industrial systems requiring TTL compatibility, low power, and robust hot-swap operation.
FAQ
What is the operating temperature range for the 74FCT157ATQG?
74FCT157ATQG is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the datasheet's "Industrial" grade specification and ensures reliable performance in factory-floor controllers, motor drives, and outdoor automation enclosures without derating.
Does the 74FCT157ATQG support live insertion into powered backplanes?
Yes, the 74FCT157ATQG supports live insertion due to its power-off disable outputs: IOFF is guaranteed ≤ ±1µA when VCC = 0V and inputs/outputs are ≤4.5V. This prevents back-driving and bus contention during hot-swap events in modular industrial systems.
What is the maximum output drive capability of the 74FCT157ATQG?
The 74FCT157ATQG provides –15mA source current (IOH) and +48mA sink current (IOL) per output. This allows direct interfacing with up to 10 standard TTL loads or driving LEDs with series resistors as low as 68Ω at 5V.
Is the 74FCT157ATQG pin-compatible with the SN74F157N?
Yes, the 74FCT157ATQG is pin-compatible with SN74F157N in the 16-pin SOIC and QSOP packages. Both share identical pin assignments for I0A–I0D, I1A–I1D, E, S, ZA–ZD, VCC, and GND-enabling drop-in replacement where timing and leakage requirements permit.
What logic family does the 74FCT157ATQG belong to, and how does it differ from standard TTL?
The 74FCT157ATQG belongs to the FAST CMOS logic family. Unlike bipolar TTL, it delivers TTL-compatible voltage thresholds (VIH/VIL) and drive strength while consuming significantly less static power (1mA max ICC vs. ~20mA for 74F157) and offering superior noise immunity due to CMOS input structure.
74FCT157ATQG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
74FCT157ATQG FAQ
1.How can I place an order for 74FCT157ATQG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT157ATQG 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 74FCT157ATQG reliable?
The price and inventory of 74FCT157ATQG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT157ATQG is usually 5 days.
3.What payment methods are accepted for 74FCT157ATQG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT157ATQG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT157ATQG?
74FCT157ATQG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT157ATQG 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 74FCT157ATQG?
For technical support, including 74FCT157ATQG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT157ATQG requirements.
6.How does Aetrix verify that 74FCT157ATQG is sourced from the original manufacturer or authorized distributors?
All 74FCT157ATQG 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 74FCT157ATQG meets industry standards.
7.What is the process for return or replacement of 74FCT157ATQG?
All 74FCT157ATQG units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT157ATQG, 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 74FCT157ATQG part is unused and in its original packaging.
Return procedure for 74FCT157ATQG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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