SN74ALS521NAlternatives & Equivalent Parts
About SN74ALS521N
SN74ALS521N is a Integrated Circuit component manufactured by Texas Instruments. It comes in a Dual-In-Line Packages package. Below you'll find known alternative and equivalent parts that can serve as replacements in your design.
Specification Comparison
| Parameter | SN74ALS521NSource | SN74ALS520N | SN74ALS521NE4 | SN74ALS688N | SN74ALS520DW |
|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package Type | Dual-In-Line Packages | Dual-In-Line Packages | Dual-In-Line Packages | Dual-In-Line Packages | SOIC-20 |
| Pin Count | 20 | 20 | 20 | 20 | 20 |
| Temperature Range | ~ 70.0°C | ~ 70.0°C | ~ 70.0°C | ~ 70.0°C | 0.0°C ~ 70.0°C |
| Price | $0.5200 | $2.0875 | — | $3.7440 | $1.0716 |
| Electrical Parameters | |||||
| Pbfree Code | Yes | Yes | Yes | Yes | — |
| YTEOL | 15 | 15 | 0 | 15 | — |
| Additional Feature | WITH PULL-UP RESISTORS ON Q INPUTS; CASCADABLE | WITH PULL-UP RESISTORS ON Q INPUTS; CASCADABLE | WITH PULL-UP RESISTORS ON Q INPUTS; CASCADABLE | CASCADABLE | — |
| Family | ALS | ALS | ALS | ALS | — |
| JESD-30 Code | R-PDIP-T20 | R-PDIP-T20 | R-PDIP-T20 | R-PDIP-T20 | — |
| JESD-609 Code | e4 | e4 | e4 | e4 | — |
| Load Capacitance (CL) | 50 pF | 50 pF | 50 pF | 50 pF | — |
| Logic IC Type | IDENTITY COMPARATOR | IDENTITY COMPARATOR | IDENTITY COMPARATOR | IDENTITY COMPARATOR | — |
| Max I(ol) | 0.024 A | 0.024 A | — | 0.024 A | — |
| Number of Bits | 8 | 8 | 8 | 8 | — |
| Number of Functions | 8 | 8 | 1 | 8 | — |
| Output Characteristics | 3-STATE | 3-STATE | 3-STATE | TOTEM-POLE | — |
| Output Polarity | INVERTED | INVERTED | INVERTED | INVERTED | — |
| Package Body Material | PLASTIC/EPOXY | PLASTIC/EPOXY | PLASTIC/EPOXY | PLASTIC/EPOXY | — |
| Package Equivalence Code | DIP20,.3 | DIP20,.3 | DIP20,.3 | DIP20,.3 | — |
| Package Shape | RECTANGULAR | RECTANGULAR | RECTANGULAR | RECTANGULAR | — |
| Package Style | IN-LINE | IN-LINE | IN-LINE | IN-LINE | — |
| Packing Method | TUBE | TUBE | TUBE | TUBE | — |
| Power Supply Current-Max (ICC) | 19 mA | 19 mA | 19 mA | 19 mA | — |
| Prop. Delay@Nom-Sup | 22 ns | 20 ns | — | 22 ns | — |
| Propagation Delay (tpd) | 20 ns | 20 ns | 20 ns | 20 ns | — |
| Qualification Status | Not Qualified | Not Qualified | Not Qualified | Not Qualified | — |
| Supply Voltage-Max (Vsup) | 5.5 V | 5.5 V | 5.5 V | 5.5 V | — |
| Supply Voltage-Min (Vsup) | 4.5 V | 4.5 V | 4.5 V | 4.5 V | — |
| Supply Voltage-Nom (Vsup) | 5 V | 5 V | 5 V | 5 V | — |
| Surface Mount | NO | NO | NO | NO | — |
| Technology | TTL | TTL | TTL | TTL | — |
| Temperature Grade | COMMERCIAL | COMMERCIAL | COMMERCIAL | COMMERCIAL | — |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) | Nickel/Palladium/Gold (Ni/Pd/Au) | NICKEL PALLADIUM GOLD | Nickel/Palladium/Gold (Ni/Pd/Au) | — |
| Terminal Form | THROUGH-HOLE | THROUGH-HOLE | THROUGH-HOLE | THROUGH-HOLE | — |
| Terminal Pitch | 2.54 mm | 2.54 mm | 2.54 mm | 2.54 mm | — |
| Terminal Position | DUAL | DUAL | DUAL | DUAL | — |
| ## SN74ALS521NE4 Alternates Showing results | — | — | Image | — | — |
| Comparison Width | — | — | — | — | 8 bit |
| Supply Voltage | — | — | — | — | 4.5-5.5 V |
| Propagation Delay | — | — | — | — | 12 ns |
| Output Type | — | — | — | — | Tri-state, active-LOW |
| Supply Current | — | — | — | — | 22 mA |
| Logic Family | — | — | — | — | ALS |
| Input Type | — | — | — | — | TTL compatible |
| Output Enable | — | — | — | — | Yes |
Cells highlighted in yellow indicate differing values across parts. Always verify with official datasheets before substitution.
Quick Links
Identity Comparator, ALS Series, 8-Bit, Inverted Output, TTL, PDIP20
Identity Comparator, ALS Series, 8-Bit, Inverted Output, TTL, PDSO20
Why Look for Alternatives?
Finding alternatives for SN74ALS521N is essential for supply chain resilience. Component shortages, long lead times, and end-of-life notices can disrupt production schedules. Having verified alternative parts ensures your designs remain manufacturable.
When evaluating SN74ALS521N replacements, consider key parameters such as package compatibility, electrical specifications, and operating temperature range. Our engineering team can help verify pin-to-pin compatibility for your specific application.
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What is equivalent to SN74ALS521N?
Known equivalents for SN74ALS521N include SN74ALS520N, SN74ALS521NE4, SN74ALS688N. Contact FindMyChip for a full compatibility analysis for your specific application.
Can I use a different manufacturer's part instead of SN74ALS521N?
In many cases, yes. Cross-manufacturer alternatives exist for most standard components. However, always verify pin compatibility, electrical specs, and package dimensions before substituting in production.
How do I verify SN74ALS521N alternatives?
Compare the datasheet specifications including pinout, voltage ratings, timing parameters, and package dimensions. FindMyChip's engineering team can help with compatibility verification — submit an RFQ to get started.