SN74ALS29854DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74ALS29854DWG4 is an 8B-to-9B parity bus transceiver in the ALS logic family, housed in a 24-pin SOIC package with 300 pF load capacitance and 48 mA output sink current. It provides bidirectional data transfer with parity generation A-to-B and error detection B-to-A. Available from stock worldwide with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- SN74ALS29854DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74ALS29854DWG4?
- Integrated 8B-to-9B parity generation (A-to-B) and error detection (B-to-A) with odd parity for reliable data integrity on bus interfaces
- Bidirectional operation with independent control allows flexible bus transceiver use in both transmit and receive directions on the same 24-pin SOIC footprint
- ALS family logic delivers high-speed switching with 300 pF load capacitance tolerance and 48 mA output sink capability for driving multiple bus loads
What is SN74ALS29854DWG4 used for?
The SN74ALS29854DWG4 is designed for use in backplane bus systems and memory subsystem interfaces where 8-bit data words must be transmitted with an added parity bit for error detection. Its bidirectional capability with independent control makes it well-suited for VMEbus, PCI predecessor, and custom parallel bus designs in industrial control systems and early workstation motherboards. The ALS family speed and 300 pF load tolerance also make it appropriate for driving heavily loaded PC board buses with multiple receiver ICs on legacy embedded computing platforms.
What are the specifications of SN74ALS29854DWG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | PARITY GENERATION A TO B; ERROR DETECTION B TO A; ODD PARITY |
| Control Type | INDEPENDENT CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | ALS |
| JESD-30 Code | R-PDSO-G24 |
| Load Capacitance (CL) | 300pF |
| Logic IC Type | BUS TRANSCEIVER |
| Max I(ol) | 0.048A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP24,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 100mA |
| Prop. Delay@Nom-Sup | 8ns |
| Propagation Delay (tpd) | 13ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Type | LOW LEVEL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74ALS29854DWG4 datasheet?
SN74ALS29854DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74ALS29854DWG4?
Compatible alternatives and drop-in replacements for SN74ALS29854DWG4:
Rochester Electronics LLC ALS SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24, PLASTIC, SO-24
Bus Transceiver, ALS Series, 1-Func, 8-Bit, Inverted Output, TTL, PDSO24
Bus Transceiver, ALS Series, 1-Func, 8-Bit, Inverted Output, TTL, PDSO24
Bus Transceiver, ALS Series, 1-Func, 8-Bit, Inverted Output, TTL, PDSO24
Frequently Asked Questions
How does SN74ALS29854DWG4 generate and check parity across its 8-bit-to-9-bit bus interface?
The SN74ALS29854DWG4 generates a 9th odd-parity bit when transmitting 8-bit data from the A-side to the B-side bus, and performs error detection when receiving 9-bit data from B-side to A-side, flagging incorrect parity. This hardware-level parity scheme detects single-bit errors across all 8 data bits and 1 parity bit at the 48 mA output drive level, without requiring software overhead in the host processor.
What load conditions can SN74ALS29854DWG4 drive on a parallel bus, and how does this affect fan-out?
The SN74ALS29854DWG4 is rated for a load capacitance (CL) of 300 pF and a maximum output low current (Iol) of 48 mA. At 48 mA sink capability, it can drive approximately 12 to 16 standard ALS or LS TTL inputs in parallel, accommodating bus topologies where multiple receiver ICs share the same 24-bit-wide backplane trace without signal integrity degradation.
For a legacy backplane design, when is SN74ALS29854DWG4 a better choice than an 8-bit non-parity transceiver like SN74ALS245?
When a backplane design requires single-bit error detection without adding a separate parity checker IC, the SN74ALS29854DWG4 is preferred because it integrates 8B-to-9B parity generation and B-to-A error detection in a single 24-pin device, whereas SN74ALS245 transfers only 8 bits without any parity capability. The added 9th parity bit reduces undetected memory bus errors, which is critical in industrial control and telecommunications systems requiring better than 10^-9 error rates on parallel data buses.
What is the package type and pin count of SN74ALS29854DWG4, and how does this affect PCB layout?
The SN74ALS29854DWG4 uses a 24-pin SOIC (Small Outline package, JESD-30 code R-PDSO-G24) with a standard 1.27 mm pin pitch. This package measures approximately 15.4 mm x 7.5 mm, which is about 30% smaller in footprint than a equivalent 24-pin PDIP while maintaining easy soldering with 1.27 mm pitch, making it suitable for surface-mount backplane card designs where board real estate is limited but manual rework is occasionally required.
Related Guides
STM32H725IGT3 Selection Guide: Memory, Package, Temperature, and Supply
Choose the right STM32H725 variant by comparing Flash, package, pin count, temperature grade, connectivity, and production requirements.
Aug 1, 2026
STM32H725IGT3 High-Performance MCU Design Guide
Design STM32H725IGT3 systems for reliable 550 MHz operation with practical power, clock, cache, DMA, PCB, ADC, and recovery guidance.
Jul 31, 2026
150141VS73100 Violet SMD LED Selection Guide: Color, Drive, and Sourcing
Select the 150141VS73100 by wavelength, brightness, drive current, 3528 fit, reliability, and traceable sourcing requirements.
Jul 31, 2026
STEF05SGR 5 V eFuse Protection Design Guide
Design a reliable 5 V STEF05SGR eFuse stage with current-limit math, capacitor sizing, thermal analysis, fault recovery, and PCB layout guidance.
Jul 30, 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
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.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit