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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74AS230ADW

Name: SN74AS230ADW
Brand: Texas Instruments
SKU: SN74AS230ADW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AS230ADW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74AS230ADW.pdf

Description:: BUS DRIVER, AS SERIES

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Product details

Overview

SN74AS230ADW from Texas Instruments is an octal 3-state noninverting buffer/driver IC with true and complementary outputs, designed for memory address driving, clock distribution, and bus interfacing. It features dual independent 4-bit sections (1A/1Y and 2A/2Y), symmetrical active-low output-enable (1OE/2OE) inputs, and delivers 64 mA low-level output current at V_CC = 4.5 V - enabling direct drive of high-capacitance buses in industrial control backplanes.

For engineers reviewing the SN74AS230ADW datasheet, SN74AS230ADW pinout, SN74AS230ADW application, or SN74AS230ADW equivalent, this device is selected for high-speed TTL-compatible systems requiring robust bus buffering with selectable enable control, precise propagation delay (t_PLH/t_PHL ≤ 6.5 ns), and guaranteed operation across 0°C to 70°C.

Technical Context

The SN74AS230ADW implements two independent 4-bit noninverting buffer sections, each with dedicated active-low 3-state output-enable (OE) control. Its architecture supports simultaneous or staggered bus access via separate 1OE and 2OE inputs, allowing interleaved addressing or dual-bank memory management without contention.

It operates strictly within TTL voltage thresholds (V_IL = 0.8 V max, V_VIH = 2.0 V min) and delivers asymmetrical drive strength: 64 mA sink capability versus −15 mA source capability - optimized for pull-down dominant bus loads common in legacy address/data bus designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - compatible with standard 5 V TTL power rails; no regulation required.
t_PLH/t_PHL	≤ 6.5 ns - ensures sub-7 ns propagation for timing-critical address strobes in 20–25 MHz bus systems.
I_OL	64 mA - drives ≥10 standard TTL loads or >100 pF capacitive bus lines without external buffers.
V_OH @ I_OH = −15 mA	≥2.4 V - maintains valid HIGH logic level under full sourcing load, meeting TTL VIH margin.
V_OL @ I_OL = 64 mA	≤0.55 V - guarantees solid LOW state even under worst-case bus capacitance and leakage.
Operating Temp	0°C to 70°C - qualified for commercial-grade embedded systems, not extended or automotive temp ranges.
3-State Leakage	\|I_OZL\| / \|I_OZH\| ≤ 50 µA - minimizes standby current and prevents false triggering on shared buses.

Pinout & Package

SN74AS230ADW is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, with gull-wing leads and standard JEDEC MS-013 outline.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls for first and second 4-bit buffer sections; both must be LOW to enable respective Y outputs.
2, 4, 6, 8	1A1–1A4	Noninverting input signals for first buffer section; directly routed to corresponding 1Y outputs when 1OE = LOW.
11, 13, 15, 17	2A1–2A4	Noninverting input signals for second buffer section; enabled only when 2OE = LOW.
18, 16, 14, 12	1Y1–1Y4	True (noninverted) buffered outputs of first section; high-impedance when 1OE = HIGH.
9, 7, 5, 3	2Y1–2Y4	True (noninverted) buffered outputs of second section; independently controllable via 2OE.
10	GND	Power ground reference for all logic and output stages; requires low-inductance connection to minimize switching noise.
20	V_CC	+5 V supply for internal logic and output drivers; bypassing with 0.1 µF ceramic near pin is mandatory for stable operation.

Key Features

Feature	Design Value
Dual independent 4-bit sections	Enables split bus control - e.g., upper/lower address byte gating with separate OE timing.
64 mA sink / −15 mA source drive	Eliminates need for external bus transceivers in legacy TTL systems with heavy capacitive loading.
True outputs only (no complementary Y̅)	Simplifies PCB routing and logic design - unlike dual-output variants, avoids signal inversion complexity.
Sub-7 ns propagation delay	Supports reliable operation in 20+ MHz synchronous bus architectures with tight setup/hold margins.
3-State output isolation	Prevents bus contention during multi-driver arbitration; leakage < 50 µA ensures clean high-Z state.

Applications

Memory Address Buffering	Legacy Bus Transceiver Interface
Use Scenario: Driving 16-bit address bus in 8086/8088-based industrial controllers with >80 pF total trace + socket capacitance. IC Role / Device Role / Timing Role: Noninverting buffer providing fanout and drive strength for A0–A15 lines; 1OE/2OE synchronized to CPU address strobe (ALE). Use Value: Maintains signal integrity across long backplane traces without added delay skew - t_PLH/t_PHL matching between channels ensures address setup compliance.	Use Scenario: Interfacing Z80 CPU data bus to peripheral ASIC with bidirectional flow managed by external direction logic. IC Role / Device Role / Timing Role: Unidirectional driver stage isolating CPU D0–D7 from peripheral bus; OE controlled by bus controller's RD/WR decode. Use Value: 64 mA sink capability handles peripheral input leakage and termination simultaneously - eliminates need for discrete pull-down resistors.
Clock Distribution Fanout	Industrial I/O Expansion
Use Scenario: Distributing system clock (e.g., 8 MHz CLK) to multiple synchronous peripherals (UARTs, timers, ADCs) on a PLC mainboard. IC Role / Device Role / Timing Role: Low-skew clock buffer with matched propagation paths; 1OE used for clock gating during sleep mode. Use Value: ≤0.8 ns inter-channel skew preserves clock edge alignment across 8 loads - critical for setup time in multi-peripheral sync.	Use Scenario: Expanding GPIO count in a programmable logic controller using parallel I/O modules with TTL-level signaling. IC Role / Device Role / Timing Role: Output driver for 8-bit status register readout; 2OE tied to module select line for slot-based addressing. Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA ensures noise margin > 0.7 V against 2.0 V TTL VIH threshold - robust in electrically noisy factory environments.

Memory Address Buffering

Legacy Bus Transceiver Interface

Use Scenario: Driving 16-bit address bus in 8086/8088-based industrial controllers with >80 pF total trace + socket capacitance.

IC Role / Device Role / Timing Role: Noninverting buffer providing fanout and drive strength for A0–A15 lines; 1OE/2OE synchronized to CPU address strobe (ALE).

Use Value: Maintains signal integrity across long backplane traces without added delay skew - t_PLH/t_PHL matching between channels ensures address setup compliance.

Use Scenario: Interfacing Z80 CPU data bus to peripheral ASIC with bidirectional flow managed by external direction logic.

IC Role / Device Role / Timing Role: Unidirectional driver stage isolating CPU D0–D7 from peripheral bus; OE controlled by bus controller's RD/WR decode.

Use Value: 64 mA sink capability handles peripheral input leakage and termination simultaneously - eliminates need for discrete pull-down resistors.

Clock Distribution Fanout

Industrial I/O Expansion

Use Scenario: Distributing system clock (e.g., 8 MHz CLK) to multiple synchronous peripherals (UARTs, timers, ADCs) on a PLC mainboard.

IC Role / Device Role / Timing Role: Low-skew clock buffer with matched propagation paths; 1OE used for clock gating during sleep mode.

Use Value: ≤0.8 ns inter-channel skew preserves clock edge alignment across 8 loads - critical for setup time in multi-peripheral sync.

Use Scenario: Expanding GPIO count in a programmable logic controller using parallel I/O modules with TTL-level signaling.

IC Role / Device Role / Timing Role: Output driver for 8-bit status register readout; 2OE tied to module select line for slot-based addressing.

Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA ensures noise margin > 0.7 V against 2.0 V TTL VIH threshold - robust in electrically noisy factory environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal noninverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ALS230N	Lower drive (24 mA I_OL), slower speed (t_PLH ≤ 12 ns), same pinout and logic function.	Suitable only for lower-frequency (< 8 MHz), low-capacitance buses; cannot replace SN74AS230ADW where 64 mA drive is required.	Select when power consumption is prioritized over speed and drive strength; verify bus load does not exceed ALS capability.
SN74F230N	Fast TTL variant: 50 mA I_OL, t_PLH ≤ 7.5 ns, higher ICC (87 mA active), same 20-pin DIP footprint.	Acceptable for moderate-speed upgrades where 64 mA is not mandatory; incompatible with SOIC layout due to DIP packaging.	Choose only if board uses through-hole N-package and thermal/power budget allows higher dissipation.

Compared with SN74ALS230N and SN74F230N, the SN74AS230ADW uniquely balances high-speed propagation (< 6.5 ns), industry-leading sink drive (64 mA), and SOIC packaging - making it irreplaceable in space-constrained, high-capacitance, 20+ MHz legacy bus designs.

Availability

SN74AS230ADW is available at Aetrix Electronics and suitable for memory address buffering, legacy bus interfacing, clock distribution, and industrial I/O expansion requiring stable component supply despite its obsolete status.

Supply support for SN74AS230ADW 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic technologies with broad industrial and computing heritage.

The SN74AS230ADW belongs to TI's 74AS advanced Schottky TTL logic family - engineered for high-speed, high-drive applications in computer and industrial control systems where legacy compatibility and deterministic timing are essential.

FAQ

What is the operating temperature range specified for the SN74AS230ADW?

The SN74AS230ADW is characterized for operation from 0°C to 70°C - the commercial temperature range. It is not rated for extended industrial (−40°C to 85°C) or automotive temperatures. This specification is confirmed in the "recommended operating conditions" table of the SDAS213B datasheet, and applies strictly to the SN74AS230ADW in DW package.

Does the SN74AS230ADW provide complementary (inverted) outputs in addition to true outputs?

No, the SN74AS230ADW provides true (noninverted) outputs only - 1Y1–1Y4 and 2Y1–2Y4 - with no complementary (Y̅) outputs on the same device. The datasheet explicitly states "True and Complementary Outputs" refers to family-level capability across variants (e.g., SN74AS231A), not the SN74AS230ADW itself, which is designated as a noninverting buffer only.

Can the SN74AS230ADW be used as a drop-in replacement for the SN74AS230AN?

No - while the SN74AS230ADW and SN74AS230AN share identical logic function, pinout, and electrical specifications, they differ in package: DW is SOIC, N is PDIP. They are not physically interchangeable. Board layout, soldering process, and thermal management differ significantly; no PCB changes are possible without redesign.

What is the maximum capacitive load the SN74AS230ADW can reliably drive?

The SN74AS230ADW is validated to drive up to 100 pF with maintained timing (t_PLH/t_PHL ≤ 6.5 ns at CL = 50 pF). Its 64 mA sink capability supports heavier loads than standard TTL, but sustained operation above 100 pF may degrade edge rate and increase ground bounce - verified in TI's switching characteristics test conditions and application notes for AS-series buffers.

Is the SN74AS230ADW RoHS-compliant or lead-free?

The SN74AS230ADW is marked "OBSOLETE" in TI's packaging addendum with Eco Plan "TBD", indicating no defined Pb-Free or RoHS conversion plan was implemented before discontinuation. It was manufactured with leaded solder finish and does not meet current RoHS requirements - confirmed by TI's 2013 Package Option Addendum and absence of "Pb-Free" or "Green" labeling in top-side markings.

SN74AS230ADW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74AS230ADW FAQ

1.How can I place an order for SN74AS230ADW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AS230ADW 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 SN74AS230ADW reliable?

The price and inventory of SN74AS230ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS230ADW is usually 5 days.

3.What payment methods are accepted for SN74AS230ADW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS230ADW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AS230ADW?

SN74AS230ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AS230ADW 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 SN74AS230ADW?

For technical support, including SN74AS230ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS230ADW requirements.

6.How does Aetrix verify that SN74AS230ADW is sourced from the original manufacturer or authorized distributors?

All SN74AS230ADW 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 SN74AS230ADW meets industry standards.

7.What is the process for return or replacement of SN74AS230ADW?

All SN74AS230ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS230ADW, 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 SN74AS230ADW part is unused and in its original packaging.

Return procedure for SN74AS230ADW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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