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Texas Instruments CD74HCT258E
- Part No.:
- CD74HCT258E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT258E.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,033
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Product details
Overview
CD74HCT258E from Texas Instruments is a quadruple 2-line-to-1-line selector/multiplexer with 3-state outputs, designed for bus-organized data routing in digital systems. It operates from 4.5 V to 5.5 V, supports –55°C to 125°C temperature range, features balanced propagation delays (typ. 11 ns at 5 V, CL = 15 pF), and drives up to 10 LS-TTL loads.
For engineers reviewing the CD74HCT258E datasheet, CD74HCT258E pinout, CD74HCT258E application, or CD74HCT258E equivalent, this device is selected for high-reliability multiplexing where TTL-compatible inputs, low quiescent current (8 µA typical), and controlled output enable timing are critical in industrial control and test equipment designs.
Technical Context
The CD74HCT258E implements four independent 2:1 multiplexers sharing a common 3-state output-enable (G) input and a single select line (A/B). Each channel selects between two inputs (e.g., 1A/1B) to drive its corresponding output (1Y) based on the logic level of A/B, while G controls all outputs' high-impedance state.
Its HCT logic family ensures TTL-voltage compatibility (VIH = 2 V min, VIL = 0.8 V max), low power consumption versus LS-TTL, and robust noise immunity. Propagation delay matching across channels (±3 ns typical variation) and tight transition time control support synchronous bus arbitration and clean signal switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V supply rails with ±10% tolerance. |
| Operating Temp | –55°C to 125°C - Qualified for extended industrial and military-grade environments without derating. |
| tpd (CL = 15 pF) | 11 ns (typ.) - Enables reliable 45 MHz switching in high-speed address/data multiplexing paths. |
| IOZ (High-Z Leakage) | ±0.5 µA (max at 5.5 V) - Minimizes bus leakage during output disable, critical for multi-drop bus integrity. |
| IOH/IOL Drive | –6 mA / +6 mA - Sufficient to directly interface with LS-TTL loads without buffering in legacy system upgrades. |
| Input Compatibility | TTL-level (VIH ≥ 2 V, VIL ≤ 0.8 V) - Allows seamless integration with 74LS and other TTL logic families. |
| Power Dissipation Cap | Cpd = 49 pF per mux - Enables accurate dynamic power estimation (PD = VCC²·fi·(Cpd + CL)) for thermal design. |
Pinout & Package
CD74HCT258E is housed in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard 0.1-inch grid PCB layouts and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B Select | Common select line determining which input (A or B) is routed to each Y output. |
| 2–3, 5–6, 10–11, 13–14 | Data Inputs (1A/1B, 2A/2B, 3A/3B, 4A/4B) | Four independent 2-input pairs feeding respective multiplexer channels. |
| 4, 7, 12, 15 | Outputs (1Y, 2Y, 3Y, 4Y) | 3-state outputs active-low when G = L; high-impedance when G = H. |
| 8 | GND | Ground reference for all logic and power domains. |
| 16 | VCC | Positive supply rail (4.5–5.5 V); must be decoupled locally for noise suppression. |
| 9 | G (Output Enable) | Active-low global enable controlling all four outputs' 3-state behavior; tie to VCC via pullup for safe power-up state. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple 2:1 Multiplexing | Four independent channels reduce component count in parallel data path selection (e.g., ADC channel routing). |
| 3-State Outputs with Common Enable | Single G input simplifies bus arbitration logic and eliminates need for discrete enable gating in shared-bus systems. |
| TTL-Compatible Inputs | Direct interfacing with legacy 74LS devices avoids level-shifting circuitry in mixed-logic upgrades. |
| Balanced Propagation Delays | Matched tpd across channels (≤3 ns variation) prevents skew-induced setup/hold violations in synchronized data buses. |
| Low Quiescent Current | ICC = 8 µA typical at 25°C enables use in low-power standby modes without compromising switching performance. |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Arbitration |
|---|---|
|
Use Scenario: Expanding digital input/output capacity in programmable logic controllers using shared backplane data lines. IC Role / Device Role / Timing Role: CD74HCT258E routes sensor status or actuator command signals from multiple modules onto a common 4-bit data bus under microcontroller control. Use Value: Four-channel integration reduces board space vs. discrete multiplexers; 3-state outputs prevent bus contention during module polling cycles. |
Use Scenario: Managing access to a shared memory or peripheral bus among multiple legacy TTL-based controllers. IC Role / Device Role / Timing Role: CD74HCT258E acts as a bus switch, selecting between two address/data sources per channel under arbitration logic. Use Value: Matched propagation delays ensure deterministic timing across all four data lanes, avoiding race conditions during bus handoff. |
| Automated Test Equipment (ATE) Signal Routing | Digital Instrumentation Multiplexing |
|
Use Scenario: Switching calibration reference signals or DUT stimulus lines in modular ATE racks with strict timing budgets. IC Role / Device Role / Timing Role: CD74HCT258E provides precise, low-skew selection of analog/digital test signals under FPGA-generated control. Use Value: High-impedance outputs isolate unused signal paths, minimizing crosstalk and loading effects on sensitive measurement circuits. |
Use Scenario: Consolidating readings from multiple sensors (e.g., thermocouples, pressure transducers) into a single ADC input channel. IC Role / Device Role / Timing Role: CD74HCT258E sequentially connects sensor outputs to a shared ADC front-end under microcontroller timing control. Use Value: TTL-compatible inputs accept direct connection from open-collector sensor interfaces; low ICC extends battery life in portable instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT258N | Same logic function, identical pinout, but rated only for –40°C to 85°C industrial range. | Limited to commercial/industrial environments; not suitable for extended temperature deployments. | Select SN74HCT258N only if operating temperature stays within –40°C to 85°C and cost sensitivity outweighs extended temp qualification. |
| CD74HC258E | Pin-compatible CMOS version with higher VCC range (2 V–6 V), but VIH/VIL thresholds differ (70%/30% of VCC), requiring level validation. | Requires verification of input voltage compatibility with driving logic; unsuitable for direct TTL replacement without redesign. | Choose CD74HC258E only when wider supply flexibility is needed and source logic guarantees compatible voltage thresholds. |
Compared with SN74HCT258N and CD74HC258E, the CD74HCT258E uniquely combines full military-grade temperature range (–55°C to 125°C), guaranteed TTL input compatibility, and drop-in PDIP-16 packaging-making it the sole option for ruggedized legacy system upgrades requiring no layout or timing revalidation.
Availability
CD74HCT258E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automated test equipment signal routing, and digital instrumentation multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT258E 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and aerospace electronics.
The CD74HCT258E belongs to TI's HCT logic family-designed specifically for TTL-compatible, low-power, high-reliability replacements in legacy digital systems requiring extended temperature operation and pin-for-pin upgrade paths.
FAQ
What is the recommended power-up sequence for CD74HCT258E to avoid bus contention?
TI recommends tying the G (output-enable) pin to VCC through a pullup resistor (value determined by driver sink capability) to ensure all outputs remain in high-impedance state during power-up. This prevents unintended signal loading on shared buses before system initialization completes. The CD74HCT258E datasheet specifies this as mandatory for safe power sequencing in bus-organized systems.
Does CD74HCT258E support hot-swap or live-insertion into an active bus?
No, CD74HCT258E does not support hot-swap operation. Its absolute maximum ratings do not include live insertion stress testing, and the absence of bus-hold or Ioff protection means powering the device while VCC is floating or mismatched can cause latch-up or excessive current flow. System-level hot-swap requires external protection circuitry beyond the CD74HCT258E's native capabilities.
Can CD74HCT258E drive a 50-pF load at 25 MHz without signal degradation?
Yes-CD74HCT258E delivers 11 ns typical propagation delay at CL = 15 pF and 5 V, scaling predictably to ~34 ns at CL = 50 pF. At 25 MHz (40 ns period), this leaves >6 ns margin for setup/hold timing, provided PCB trace impedance and termination are controlled. The CD74HCT258E's balanced transition times further minimize jitter in such configurations.
How does the input loading of CD74HCT258E compare to standard LS-TTL devices?
CD74HCT258E uses unit-load-based input loading: G and A/B inputs draw 1.5 unit loads (360 µA max at 25°C), while A and B inputs draw 0.5 unit loads each. This is significantly lower than LS-TTL's 1.6 mA per input, reducing fanout burden on upstream drivers and enabling cleaner signal integrity in dense logic arrays using CD74HCT258E.
Is CD74HCT258E RoHS-compliant and lead-free?
Yes, CD74HCT258E is RoHS-compliant with NiPdAu (NIPDAU) lead finish, as confirmed in TI's Packaging Information Addendum. It meets JEDEC J-STD-020 moisture sensitivity requirements and is qualified for lead-free reflow soldering processes, making it suitable for modern environmentally regulated production environments.
CD74HCT258E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6mA, 6mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HCT258E FAQ
1.How can I place an order for CD74HCT258E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT258E 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 CD74HCT258E reliable?
The price and inventory of CD74HCT258E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT258E is usually 5 days.
3.What payment methods are accepted for CD74HCT258E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT258E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT258E?
CD74HCT258E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT258E 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 CD74HCT258E?
For technical support, including CD74HCT258E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT258E requirements.
6.How does Aetrix verify that CD74HCT258E is sourced from the original manufacturer or authorized distributors?
All CD74HCT258E 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 CD74HCT258E meets industry standards.
7.What is the process for return or replacement of CD74HCT258E?
All CD74HCT258E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT258E, 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 CD74HCT258E part is unused and in its original packaging.
Return procedure for CD74HCT258E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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