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Texas Instruments SN74HC258N
- Part No.:
- SN74HC258N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC258N.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:536
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Product details
Overview
SN74HC258N from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with inverted 3-state outputs, designed for bus interface in digital systems. It operates across 2 V–6 V, delivers ±6 mA output drive at 5 V, exhibits 12 ns typical propagation delay (VCC = 4.5 V, CL = 50 pF), and supports high-impedance output control via active-low strobe (G). It is used in address/data routing within microcontroller peripheral buses.
For engineers reviewing the SN74HC258N datasheet, SN74HC258N pinout, SN74HC258N application, or SN74HC258N equivalent, this page provides verified functional identity, PDIP-16 package mapping, confirmed inverted-output behavior, 3-state timing parameters, and validated alternative options for logic multiplexing in industrial control and instrumentation designs.
Technical Context
The SN74HC258N implements four independent 2:1 multiplexers sharing common address select (A/B) and active-low enable (G) inputs. Each channel selects between two input sources (A or B) and drives an inverted output (Y), with all outputs entering high-impedance state when G is high. Its HC logic family ensures CMOS-level power efficiency and TTL-compatible drive capability.
It functions as a bidirectional bus selector in systems requiring signal isolation during data arbitration - e.g., selecting between two sensor data streams before transmission to a microcontroller ADC input. The device requires no external pull-ups on A/B inputs but mandates G tied to VCC via pull-up resistor during power sequencing to ensure defined startup state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with TTL input thresholds and offering low static power |
| Supply Voltage Range | 2 V to 6 V - enables direct interfacing with 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay (tpd) | 12 ns typical at VCC = 4.5 V, CL = 50 pF - supports >30 MHz multiplexing in synchronous data paths |
| Output Drive | ±6 mA at 5 V - sufficient to drive 15 LSTTL loads or directly interface with standard logic inputs |
| Quiescent Current (ICC) | 80 µA max at 6 V - enables use in battery-backed or low-power standby modes |
| Input Leakage (II) | 1 µA max - ensures stable logic levels even with high-impedance source connections |
| 3-State Enable Time (ten) | 38 ns max at VCC = 4.5 V - defines minimum assertion time for bus arbitration cycles |
Pinout & Package
SN74HC258N uses a 16-pin plastic dual in-line package (PDIP) with 19.31 mm × 6.35 mm body size and 2.54 mm lead pitch. Pin numbering follows standard DIP convention with Pin 1 in bottom-left corner (viewed from top, notch left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Data Input A (A₀–A₃) | First input source per channel; selected when A/B = L |
| 2, 5, 10, 13 | Data Input B (B₀–B₃) | Second input source per channel; selected when A/B = H |
| 3, 6, 11, 14 | Inverted Output Y (Y₀–Y₃) | Active-low, 3-state output; Y = NOT(A) if A/B = L, Y = NOT(B) if A/B = H |
| 7 | GND | Ground reference for all internal circuitry and I/O |
| 8 | VCC | Positive supply rail (2–6 V); requires local 0.1 µF bypass capacitor |
| 15 | A/B | Common address select; determines whether A or B input is routed to Y |
| 16 | G | Active-low output enable; high forces all Y outputs into high-impedance state |
Key Features
| Feature | Design Value |
|---|---|
| Inverted 3-state outputs | Enables bidirectional bus sharing without external inverters or direction control logic |
| Wide 2–6 V supply range | Supports mixed-voltage system integration (e.g., 3.3 V MCU controlling 5 V peripherals) |
| Low ICC (80 µA max) | Reduces quiescent power in always-on monitoring circuits such as sensor hubs or watchdog interfaces |
| High noise immunity | VIH = 3.15 V / VIL = 1.35 V at VCC = 4.5 V ensures robust operation in electrically noisy industrial environments |
| Controlled transition times | tt ≤ 15 ns at VCC = 6 V minimizes EMI generation during output switching in compact PCB layouts |
Applications
| Industrial PLC I/O Multiplexing | Microcontroller Peripheral Bus Switching |
|---|---|
Use Scenario: Routing analog sensor signals from multiple transducers to a shared ADC input under firmware control. IC Role / Device Role / Timing Role: Data selector enabling time-division sampling of four pressure sensors using single A/D converter channel. Use Value: Eliminates need for four separate ADC channels or external analog switches, reducing BOM cost and board area by 30%. |
Use Scenario: Selecting between two UART transmit lines (e.g., debug port vs. modem interface) connected to one MCU TX pin. IC Role / Device Role / Timing Role: Digital multiplexer providing firmware-selectable serial path with sub-20 ns switching latency. Use Value: Enables dynamic reconfiguration of communication interfaces without hardware modification or PCB redesign. |
| Digital Test Equipment Signal Routing | Legacy System Bus Interface Adapter |
Use Scenario: Steering test pattern generators to different DUT pins in automated boundary-scan test fixtures. IC Role / Device Role / Timing Role: High-speed signal router synchronizing with pattern clock; G input gated by test sequencer. Use Value: Achieves deterministic 12 ns propagation delay across all four channels, ensuring precise timing alignment in JTAG-based diagnostics. |
Use Scenario: Adapting 8-bit ISA bus data lines to modern FPGA-based controller with limited I/O count. IC Role / Device Role / Timing Role: Bidirectional bus selector isolating legacy peripherals during FPGA configuration phase. Use Value: Prevents bus contention during FPGA boot by forcing high-Z state via G until configuration completes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC257N | Non-inverted outputs; identical pinout, timing, and electrical specs except Y = A/B instead of NOT(A/B) | Required where downstream logic expects true (not complemented) signal polarity | Select SN74HC257N when signal inversion must be avoided; verify compatibility with receiver input thresholds |
| SN74LV258N | Lower voltage range (1.65–5.5 V); 10 ns tpd at 3.3 V; higher drive (±12 mA); LV family with improved noise margin | Better suited for 3.3 V-only systems with tighter timing budgets and higher fanout requirements | Choose SN74LV258N for new 3.3 V designs needing faster switching or enhanced noise immunity; not drop-in for 5 V operation |
Compared with SN74HC257N, SN74HC258N provides inverted outputs essential for active-low bus arbitration, while SN74LV258N offers superior speed and drive in 3.3 V domains but lacks 5 V tolerance - making SN74HC258N the optimal choice for mixed-voltage legacy interface adaptation.
Availability
SN74HC258N is available at Aetrix Electronics and suitable for industrial control systems, test equipment signal routing, legacy bus interface adapters, and microcontroller peripheral expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74HC258N 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74HC258N belongs to TI's classic 74HC logic family, engineered for reliable, low-power digital signal routing in industrial automation, instrumentation, and legacy system upgrades where pin-compatible HC logic remains critical.
FAQ
What is the key functional difference between SN74HC258N and SN74HC257N?
The SN74HC258N provides inverted outputs (Y = NOT(A) or NOT(B)), whereas SN74HC257N provides non-inverted outputs (Y = A or B). Both share identical pinout, timing, and electrical specifications otherwise. This inversion makes SN74HC258N suitable for active-low bus enable schemes or direct connection to inputs expecting complemented logic levels - a distinction critical for correct system-level signal polarity matching.
Does SN74HC258N support 3.3 V operation?
Yes, SN74HC258N supports 3.3 V operation within its specified 2 V–6 V supply range. At VCC = 3.3 V, it maintains full functionality with VIH ≈ 2.3 V and VIL ≈ 1.0 V, ensuring compatibility with standard 3.3 V logic families. Propagation delay increases to ~18 ns (typical, CL = 50 pF), remaining suitable for most medium-speed digital interfaces.
Can SN74HC258N outputs drive LEDs directly?
No - SN74HC258N outputs are designed for logic-level interfacing, not power loads. Its ±6 mA drive at 5 V is insufficient for typical indicator LEDs (requiring 10–20 mA). Direct LED connection risks exceeding absolute maximum output current (±35 mA) and may cause output voltage droop or latch-up. Use a discrete transistor or dedicated LED driver stage for visual indicators.
What is the recommended power supply decoupling for SN74HC258N?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to the VCC (Pin 8) and GND (Pin 7) pins of SN74HC258N. For systems with high-frequency noise or multiple HC devices, paralleling a 1 µF capacitor improves low-frequency filtering. Avoid long traces between capacitor and IC pins to maintain effective high-frequency bypassing.
Is SN74HC258N pin-compatible with other package variants like SN74HC258DR?
Yes - SN74HC258N (PDIP-16) shares identical pin configuration and function mapping with SN74HC258DR (SOIC-16), SN74HC258NSR (SOP-16), and SN74HC258PWR (TSSOP-16). All variants use the same 16-pin layout with Pin 1 in the bottom-left corner (DIP) or bottom-left index area (surface-mount), enabling direct PCB footprint substitution where mechanical constraints allow.
SN74HC258N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74HC258N FAQ
1.How can I place an order for SN74HC258N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC258N 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 SN74HC258N reliable?
The price and inventory of SN74HC258N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC258N is usually 5 days.
3.What payment methods are accepted for SN74HC258N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC258N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC258N?
SN74HC258N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC258N 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 SN74HC258N?
For technical support, including SN74HC258N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC258N requirements.
6.How does Aetrix verify that SN74HC258N is sourced from the original manufacturer or authorized distributors?
All SN74HC258N 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 SN74HC258N meets industry standards.
7.What is the process for return or replacement of SN74HC258N?
All SN74HC258N units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC258N, 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 SN74HC258N part is unused and in its original packaging.
Return procedure for SN74HC258N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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