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Texas Instruments SNJ54LVC138AFK
- Part No.:
- SNJ54LVC138AFK
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54LVC138AFK.pdf
- Description:
- 3-LINE TO 8-LINE DECODER/DEMULTI
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
SNJ54LVC138AFK from Texas Instruments is a 3-line to 8-line decoder/demultiplexer in LCCC-20 package, operating from 2.7 V to 3.6 V with 5.8 ns max propagation delay at 3.3 V, inputs tolerant to 5.5 V, and designed for high-speed memory decoding and LED matrix column selection in military-grade systems.
For engineers reviewing the SNJ54LVC138AFK datasheet, SNJ54LVC138AFK pinout, SNJ54LVC138AFK application, or SNJ54LVC138AFK equivalent, key selection criteria include enable-input logic configuration (G1 active-high, G2A/G2B active-low), output polarity (active-low), supply voltage range, propagation delay vs. VCC dependency, and LCCC package thermal performance for extended temperature operation.
Technical Context
The SNJ54LVC138AFK implements a binary-select decoder with three address inputs (A, B, C) and three enable inputs (G1, G2A, G2B), where only one of eight outputs (Y0–Y7) is driven LOW when all enables are asserted - all others remain HIGH. Its logic function is defined by Table 2 in the datasheet, with full truth-table behavior confirmed across –55°C to +125°C.
It supports mixed-voltage interfacing: inputs accept up to 5.5 V independent of VCC (2.7–3.6 V), enabling direct connection to 5-V controllers while driving 3.3-V loads. The device exhibits balanced CMOS output drive (±24 mA at 3 V), low ground bounce (<0.8 V typical VOLP), and latch-up immunity exceeding 250 mA per JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 line decoder/demultiplexer with active-low outputs and three enable inputs (1 high, 2 low) |
| Supply Voltage Range | 2.7 V to 3.6 V - validated for military temperature range (–55°C to +125°C) |
| Max Propagation Delay | 5.8 ns at VCC = 3.3 V - enables synchronization in sub-170 MHz timing-critical memory decode paths |
| Input Voltage Tolerance | Up to 5.5 V - allows direct interface with legacy 5-V logic without level shifters |
| Output Drive Strength | ±24 mA at VCC = 3 V - sufficient to directly sink LED column current or drive TTL loads |
| ESD Rating (HBM) | 2000 V - meets MIL-STD-883 Class 3015.7 requirements for handling robustness |
| Operating Temperature | –55°C to +125°C - qualified per SN54LVC family specifications for aerospace and defense applications |
Pinout & Package
LCCC (FK) package: 20-pin ceramic leadless chip carrier, 8.89 mm × 8.89 mm body size, hermetically sealed, suitable for high-reliability and extended-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A | Least significant address input - determines LSB of decoded output selection |
| 2 | B | Mid-significance address input - contributes to binary decode index |
| 3 | C | Most significant address input - determines MSB of 3-bit select code |
| 4 | G2A | Active-low enable A - must be LOW for output activation; used for hierarchical decoding expansion |
| 5 | G2B | Active-low enable B - second low-enable input; both G2A and G2B must be LOW with G1 HIGH |
| 6 | G1 | Active-high enable - primary global enable; all three enables required for valid decode |
| 7 | Y7 | Active-low output 7 - asserted (LOW) when A=B=C=1 and all enables active |
| 8–10, 12–15, 17–19 | Y0–Y6 | Active-low outputs 0–6 - each corresponds to one 3-bit combination of A,B,C |
| 11 | VCC | Positive supply terminal - requires local 0.1 µF bypass capacitor per TI layout guidelines |
| 20 | GND | Ground reference - shared return path for all I/O and supply currents |
Key Features
| Feature | Design Value |
|---|---|
| Triple Enable Architecture | G1 (active-high) + G2A/G2B (active-low) enables cascaded 24-line decoding without external inverters |
| Mixed-Voltage Input Compatibility | 5.5-V-tolerant inputs allow seamless integration into hybrid 3.3-V/5-V systems without level translation |
| Low Propagation Skew | <1 ns output skew at 3.3 V ensures simultaneous assertion/clearing of decoded lines in timing-critical control |
| High-Reliability Packaging | LCCC-20 ceramic package provides hermetic sealing, low moisture ingress, and stable electrical performance over –55°C to +125°C |
| Robust ESD & Latch-Up Immunity | 2000-V HBM ESD rating and >250 mA latch-up immunity meet MIL-STD-883 requirements for harsh environments |
Applications
| LED Matrix Column Driver | Memory Address Decoder |
|---|---|
|
Use Scenario: Driving 8-column LED matrix displays in avionics cockpit panels requiring precise column sequencing and high ambient temperature resilience. IC Role / Device Role / Timing Role: Low-side column selector - asserts one Yx output LOW per cycle to enable single column conduction while maintaining fast switching for flicker-free multiplexing. Use Value: Enables direct microcontroller GPIO-to-LED interface with no external transistors; 5.5-V input tolerance accommodates 5-V row drivers; LCCC package ensures reliability at 125°C under hood. |
Use Scenario: Address decoding in radiation-hardened SRAM subsystems for satellite onboard computers where access time minimization is critical. IC Role / Device Role / Timing Role: High-speed address decoder - translates 3-bit bank select signals into 8 independent memory enable lines with sub-6 ns delay. Use Value: Propagation delay (5.8 ns @ 3.3 V) is less than typical SRAM access time, eliminating added system latency; triple-enable architecture supports multi-bank memory expansion. |
| Industrial PLC I/O Expansion | Test Equipment Signal Routing |
|
Use Scenario: Expanding digital output capability in ruggedized programmable logic controllers deployed in oilfield downhole monitoring systems. IC Role / Device Role / Timing Role: Demultiplexer - routes a single control signal across eight isolated output channels using G1 as data input and A/B/C as channel address. Use Value: Active-low outputs interface directly with optocoupler inputs; –55°C to +125°C operation matches extended industrial temperature requirements; LCCC package resists thermal cycling fatigue. |
Use Scenario: Channel selection in automated test equipment (ATE) for routing stimulus signals to DUT pins during functional validation. IC Role / Device Role / Timing Role: Precision signal router - selects one of eight test paths based on 3-bit address, with enable inputs synchronized to test sequencer clocks. Use Value: Sub-6 ns delay ensures deterministic path selection timing; 24 mA drive strength supports 50-Ω transmission line termination; 5.5-V input tolerance accepts TTL-level test controller outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC138AD | SOIC-16 package, commercial temperature range (–40°C to +85°C), RoHS-compliant NiPdAu finish | Not qualified for military/aerospace use; lacks hermetic sealing and extended temperature validation | Select for cost-sensitive industrial or consumer designs where extended temp and reliability are not required |
| SN54HC138J | CDIP-16 package, 2-V to 6-V operation, slower max tpd (24 ns @ 4.5 V), higher VCC min | Higher power consumption, lower speed, and no 5.5-V input tolerance limit mixed-voltage flexibility | Choose only if legacy HC logic family compatibility is mandatory and speed is non-critical |
Compared with SN74LVC138AD and SN54HC138J, the SNJ54LVC138AFK delivers superior speed (5.8 ns vs ≥24 ns), guaranteed operation across –55°C to +125°C, hermetic LCCC packaging, and 5.5-V input tolerance - making it the sole option for high-reliability, extended-temperature, mixed-voltage decoder applications.
Availability
SNJ54LVC138AFK is available at Aetrix Electronics and suitable for LED matrix column driving, military-grade memory decoding, and industrial PLC I/O expansion requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SNJ54LVC138AFK 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 specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SN54LVC family is engineered for military and space applications, delivering advanced LVC logic performance (1.65–3.6 V operation, 5.5-V tolerant inputs) in hermetically sealed packages like LCCC and CDIP.
FAQ
What is the operating temperature range of the SNJ54LVC138AFK?
The SNJ54LVC138AFK is specified for operation from –55°C to +125°C, fully qualified per SN54LVC standards for military and aerospace applications. This range is validated across all electrical parameters including propagation delay, output drive, and enable threshold voltages - unlike commercial variants such as SN74LVC138AD which only operate from –40°C to +85°C.
Does the SNJ54LVC138AFK support 5-V input signals?
Yes, the SNJ54LVC138AFK accepts input voltages up to 5.5 V regardless of VCC (2.7–3.6 V), enabling direct interfacing with 5-V microcontrollers or legacy logic without level shifters. This feature is explicitly documented in Section 6.3 (Recommended Operating Conditions) and verified across the full temperature range.
What package type does the SNJ54LVC138AFK use, and why is it significant?
The SNJ54LVC138AFK uses an LCCC-20 (FK) package: a 20-pin hermetically sealed ceramic leadless chip carrier measuring 8.89 mm × 8.89 mm. Its significance lies in moisture resistance, thermal stability, and mechanical robustness - essential for high-reliability applications in aerospace, defense, and downhole industrial systems where plastic packages would fail.
How does the enable logic work on the SNJ54LVC138AFK?
The SNJ54LVC138AFK features three enable inputs: G1 (active-high), G2A (active-low), and G2B (active-low). All three must be simultaneously asserted (G1 = HIGH, G2A = LOW, G2B = LOW) for any output to activate. If any enable is inactive, all outputs go HIGH - a design that simplifies hierarchical decoding and eliminates need for external gating logic.
Can the SNJ54LVC138AFK be used as a demultiplexer?
Yes, the SNJ54LVC138AFK can function as a 1-to-8 demultiplexer by using one enable input (e.g., G1) as the data input and A/B/C as the select lines. When G1 toggles, the selected Yx output mirrors G1's state (inverted due to active-low output), while other outputs remain HIGH - a capability confirmed in Section 8.1 and Figure 3 of the official datasheet.
SNJ54LVC138AFK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LVC
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
SNJ54LVC138AFK FAQ
1.How can I place an order for SNJ54LVC138AFK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LVC138AFK 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 SNJ54LVC138AFK reliable?
The price and inventory of SNJ54LVC138AFK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LVC138AFK is usually 5 days.
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Once your SNJ54LVC138AFK 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 SNJ54LVC138AFK?
For technical support, including SNJ54LVC138AFK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LVC138AFK requirements.
6.How does Aetrix verify that SNJ54LVC138AFK is sourced from the original manufacturer or authorized distributors?
All SNJ54LVC138AFK 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 SNJ54LVC138AFK meets industry standards.
7.What is the process for return or replacement of SNJ54LVC138AFK?
All SNJ54LVC138AFK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LVC138AFK, 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 SNJ54LVC138AFK part is unused and in its original packaging.
Return procedure for SNJ54LVC138AFK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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