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Texas Instruments AM26LS33AMFKB
- Part No.:
- AM26LS33AMFKB
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 20-CLCC
- Datasheet:
-
AM26LS33AMFKB.pdf
- Description:
- IC TRANSCEIVER HALF 0/4 20LCCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,677
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Product details
Overview
AM26LS33AMFKB from Texas Instruments is a military-grade quadruple differential line receiver compliant with ANSI TIA/EIA-422-B, TIA/EIA-423-B, and ITU V.10/V.11 standards. It provides ±15-V common-mode input range, ±500-mV sensitivity, 3-state outputs, and operates from a single 5-V supply. It serves as the interface between long-haul RS-422/RS-423 bus lines and TTL-level logic in high-reliability industrial control systems.
For engineers reviewing the AM26LS33AMFKB datasheet, AM26LS33AMFKB pinout, AM26LS33AMFKB application, or AM26LS33AMFKB equivalent, this page delivers verified electrical specs, military-temperature LCCC package details, fail-safe open-input behavior, propagation delay (20–40 ns), and direct substitution guidance for ruggedized serial communication designs.
Technical Context
The AM26LS33AMFKB implements four independent differential receivers with complementary active-high and active-low enable inputs (G and G̅), enabling flexible bus arbitration and power-down control. Its fail-safe design ensures high outputs when inputs are open or unterminated.
It features 12-kΩ minimum input impedance, 50-mV typical hysteresis, and is characterized across –55°C to +125°C. Unlike commercial variants, the AM26LS33AMFKB uses SNPB (tin-lead) finish and LCCC (FK) packaging for hermetic reliability in aerospace and defense applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports wide-tolerance 5-V rails common in military power systems |
| Common-Mode Range | ±15 V - rejects large ground potential differences across long cables (e.g., >100 m) |
| Differential Sensitivity | ±500 mV - reliably detects valid logic transitions under noisy industrial EMI conditions |
| Propagation Delay | 20–40 ns - enables reliable operation up to ~10 Mbps in point-to-point RS-422 links |
| Input Hysteresis | 50 mV typical - prevents output oscillation on slow-rising or noisy differential signals |
| Output Drive | 8 mA sink / –440 µA source - directly interfaces with standard TTL loads without buffering |
| Operating Temperature | –55°C to +125°C - qualified for extended-range military and avionics environments |
Pinout & Package
LCCC (FK) 20-pin ceramic flatpack, hermetically sealed, with 8.9 mm × 8.9 mm footprint and leadless construction suitable for high-reliability PCB assembly and thermal cycling stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 6, 8, 10, 12, 13, 18, 19 | Differential Input (1A/1B, 2A/2B, 3A/3B, 4A/4B) | Four independent RS-422-compatible differential pairs; each pair requires matched routing |
| 4, 5, 14, 15 | Logic Output (1Y, 2Y, 3Y, 4Y) | 3-state TTL-compatible outputs; high-impedance when either G or G̅ is inactive |
| 11, 16 | Enable Inputs (G, G̅) | Complementary enables - device active when G = HIGH *or* G̅ = LOW; supports both logic polarities |
| 20 | VCC | 5-V supply pin - requires local 0.1-µF ceramic bypass capacitor per TI layout guidelines |
| 10 | GND | Ground reference - must be connected to low-impedance system ground plane |
| 1, 6, 11, 16 | NC | No internal connection - left unconnected per datasheet; no routing or stubs required |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe open-input logic | Outputs default HIGH when inputs float - eliminates need for external pull-up resistors in unterminated buses |
| ±15-V common-mode rejection | Supports operation across large ground potential differences in factory automation or motor drive cabinets |
| Complementary enable architecture | Allows seamless integration with either active-high or active-low controller GPIO without level-shifting |
| 12-kΩ minimum input impedance | Reduces loading on RS-422 transmitters and enables daisy-chaining of multiple receivers on one bus |
| Military temperature qualification | Validated from –55°C to +125°C - meets MIL-PRF-38535 requirements for Class B devices |
Applications
| Industrial Motor Control | Avionics Data Bus Interface |
|---|---|
Use Scenario: Isolating and receiving encoder feedback or command signals from AC servo drives over 50+ meter twisted-pair runs in electrically noisy factory environments. IC Role / Device Role / Timing Role: Differential line receiver converting RS-422 bus signals to TTL logic for FPGA or MCU input capture. Use Value: ±15-V common-mode range suppresses ground-loop noise; 50-mV hysteresis prevents chatter on slow encoder edges. |
Use Scenario: Interfacing flight control computers with remote sensor modules via ARINC 429-compatible physical layer wiring in aircraft subsystems. IC Role / Device Role / Timing Role: Robust RS-422 receiver translating differential bus data into deterministic logic levels for safety-critical monitoring circuits. Use Value: –55°C to +125°C operation ensures functionality during extreme thermal soak; LCCC package resists vibration-induced solder fatigue. |
| Tactical Communications Equipment | Substation Automation Systems |
Use Scenario: Receiving encrypted command streams from field radios across armored vehicle chassis where ground potentials vary significantly between subsystems. IC Role / Device Role / Timing Role: Signal integrity-preserving receiver in hardened serial link between crypto module and mission computer. Use Value: Fail-safe HIGH output on open inputs prevents undefined states during cable disconnect or fault; SNPB finish ensures solder joint reliability under shock. |
Use Scenario: Connecting protective relays and RTUs in high-voltage substations using shielded twisted-pair cabling exposed to lightning-induced surges and EMI. IC Role / Device Role / Timing Role: Isolation boundary receiver converting legacy RS-422 telemetry to microcontroller UART peripherals. Use Value: ±25-V absolute max input rating protects against transient coupling; 12-kΩ input impedance minimizes loading on upstream transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM26LS33AMJB | CDIP-16 package (plastic vs ceramic), same electrical specs and temp range (–55°C to +125°C), SNPB finish | Lower cost and easier hand-soldering; less resistant to thermal shock and hermetic sealing requirements | Select AM26LS33AMJB for non-hermetic, cost-sensitive military programs where board-level conformal coating suffices |
| AM26LS33ACD | Commercial SOIC-16, 0°C to +70°C, RoHS-compliant NiPdAu finish, lower price | Not qualified for extended temperature or high-reliability use; unsuitable for aerospace or defense deployments | Use AM26LS33ACD only in benign commercial environments with stable ambient temperatures and no vibration/shock requirements |
Compared with AM26LS33AMFKB, the AM26LS33AMJB offers identical performance in a less rugged CDIP package, while AM26LS33ACD sacrifices military qualification for cost and RoHS compliance-making the FK variant the sole choice for hermetic, high-shock, full-temperature-range deployments.
Availability
AM26LS33AMFKB is available at Aetrix Electronics and suitable for industrial motor control, avionics data interfaces, and tactical communications equipment requiring stable component supply across extended temperature and high-reliability lifecycle demands.
Supply support for AM26LS33AMFKB 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 global semiconductor leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.
The AM26LS33AMFKB belongs to TI's military-grade interface IC product line, designed specifically for robust RS-422/RS-423 reception in harsh environments where signal integrity, temperature resilience, and long-term reliability are critical.
FAQ
What is the operating temperature range of the AM26LS33AMFKB?
The AM26LS33AMFKB is fully characterized and qualified for continuous operation from –55°C to +125°C. This military-grade temperature range is validated per MIL-PRF-38535 requirements and makes the AM26LS33AMFKB suitable for deployment in avionics, ground vehicles, and space-qualified subsystems where thermal extremes are routine.
Does the AM26LS33AMFKB require external pull-up or pull-down resistors on its inputs?
No, the AM26LS33AMFKB includes built-in fail-safe circuitry that forces all outputs HIGH when differential inputs are open or unterminated. This eliminates the need for external biasing resistors in most RS-422 receiver configurations, simplifying board design and reducing component count for the AM26LS33AMFKB.
What package type does the AM26LS33AMFKB use, and why is it significant?
The AM26LS33AMFKB uses a 20-pin LCCC (FK) ceramic flatpack package. This hermetically sealed, leadless construction provides superior moisture resistance, thermal cycling endurance, and mechanical stability-critical for aerospace, defense, and downhole applications where the AM26LS33AMFKB must maintain reliability under extreme environmental stress.
How does the AM26LS33AMFKB differ from the commercial AM26LS33AC variant?
The AM26LS33AMFKB differs from AM26LS33AC in three key ways: it uses SNPB (tin-lead) metallization instead of RoHS-compliant NiPdAu, is rated for –55°C to +125°C versus 0°C to +70°C, and is packaged in hermetic LCCC rather than plastic SOIC. These distinctions make the AM26LS33AMFKB appropriate only for high-reliability programs where the AM26LS33AC cannot meet specification.
Can the AM26LS33AMFKB be used with RS-485 transceivers?
Yes-the AM26LS33AMFKB is electrically compatible with RS-485 differential signaling due to its ±15-V common-mode range and ±500-mV sensitivity, though it lacks driver capability. When paired with an RS-485 transceiver like the SN65HVD7x series, the AM26LS33AMFKB serves as a dedicated, high-immunity receiver stage in half-duplex or full-duplex networks where enhanced noise rejection is required beyond standard RS-485 receivers.
AM26LS33AMFKB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Receiver
- Protocol:
- RS422, RS423
- Number of Drivers/Receivers:
- 0/4
- Duplex:
- Half
- Receiver Hysteresis:
- 50 mV
- Data Rate:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
AM26LS33AMFKB FAQ
1.How can I place an order for AM26LS33AMFKB through Aetrix?
Please submit a Request for Quotation (RFQ) for AM26LS33AMFKB 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 AM26LS33AMFKB reliable?
The price and inventory of AM26LS33AMFKB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM26LS33AMFKB is usually 5 days.
3.What payment methods are accepted for AM26LS33AMFKB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM26LS33AMFKB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM26LS33AMFKB?
AM26LS33AMFKB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM26LS33AMFKB 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 AM26LS33AMFKB?
For technical support, including AM26LS33AMFKB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM26LS33AMFKB requirements.
6.How does Aetrix verify that AM26LS33AMFKB is sourced from the original manufacturer or authorized distributors?
All AM26LS33AMFKB 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 AM26LS33AMFKB meets industry standards.
7.What is the process for return or replacement of AM26LS33AMFKB?
All AM26LS33AMFKB units undergo pre-shipment inspection (PSI). If there is an issue with AM26LS33AMFKB, 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 AM26LS33AMFKB part is unused and in its original packaging.
Return procedure for AM26LS33AMFKB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AM26LS33AMFKB Tags
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