SN74ALS520DW Texas Instruments logic-gates (SOIC-20) In Stock
SN74ALS520DW is an 8-bit identity comparator with ALS technology and output enable, SOIC-20. From $1.47 at 205+pcs. In stock, ships globally.
- Manufacturer
- Texas Instruments
- Package
- SOIC-20
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74ALS520DW Datasheet PDF
- Category
- logic-gates
- Price
- From $1.0716(MOQ 1)
- Temp Range
- 0.0°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74ALS520DW?
- 8-bit parallel identity comparison in single clock cycle
- Output enable for bus-connected applications
- Advanced Low-Power Schottky for speed-power balance
- Active-low output indicates word match
- Wide supply: 4.5V to 5.5V TTL compatible
What is SN74ALS520DW used for?
Used in address decoding, pattern matching, memory bank selection, and hardware comparator circuits. Common in legacy bus architectures, PLDs, and digital systems requiring fast parallel word comparison.
What are the specifications of SN74ALS520DW?
| Comparison Width | 8bit |
| Supply Voltage | 4.5-5.5V |
| Propagation Delay | 12ns |
| Output Type | Tri-state, active-LOW |
| Supply Current | 22mA |
| Logic Family | ALS |
| Input Type | TTL compatible |
| Output Enable | Yes |
| Package | SOIC-20 |
Compliance & Regulatory
| RoHS Status | Compliant |
Where can I find the SN74ALS520DW datasheet?
SN74ALS520DW Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74ALS520DW?
Compatible alternatives and drop-in replacements for SN74ALS520DW:
Frequently Asked Questions
How does SN74ALS520 compare two words?
The SN74ALS520 simultaneously compares two 8-bit input words (P0-P7 and Q0-Q7). When all 8 bit pairs match, the active-low output (P=Q) goes LOW. Any single bit mismatch drives the output HIGH. Comparison is combinational with no clock required.
What is the propagation delay of SN74ALS520?
Typical propagation delay from input change to output is 12ns, making it suitable for high-speed address decoding. The ALS technology provides a good balance between the faster but power-hungry AS series and the slower LS series.
Does SN74ALS520 have an output enable?
Yes, the output enable (OE) input allows the output to be placed in a high-impedance state, enabling direct connection to shared buses. When OE is inactive (HIGH), the output is tri-stated regardless of input comparison results.
What are common applications for 8-bit comparators?
8-bit comparators like SN74ALS520 are used for address decoding (comparing bus address with target address), data matching in hardware lookup tables, DIP switch setting comparison, and bus arbitration where exact word matching is needed.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $3.3120 | $3.31 |
| 12+ | $1.6560 | $19.87 |
| 33+ | $1.2365 | $40.80 |
| 103+ | $1.1541 | $118.87 |
| 218+ | $1.0716 | $233.61 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”