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Texas Instruments CD4555BMT
- Part No.:
- CD4555BMT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4555BMT.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:972
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Product details
Overview
CD4555BMT from Texas Instruments is a dual 1-of-4 decoder/demultiplexer IC in a 16-pin SOIC package, operating across –55°C to +125°C, with CMOS logic compatibility, 20-V max supply rating, and TTL-level input thresholds. It functions as a binary-to-one-hot address decoder in industrial control logic, memory address selection, and discrete signal routing circuits.
For engineers reviewing the CD4555BMT datasheet, CD4555BMT pinout, CD4555BMT application, or CD4555BMT equivalent, this page delivers verified package mapping (SOIC-D), functional truth table behavior, supply voltage tolerance (3–20 V), propagation delay (120 ns at 15 V), and validated alternatives for legacy system redesigns and obsolescence mitigation.
Technical Context
The CD4555BMT implements two independent 1-of-4 decoders, each accepting two binary inputs (A0/A1) and an active-low enable (E̅), producing four mutually exclusive low-active outputs (Y0–Y3). Its dual-gate architecture enables synchronous decoding without internal inter-channel coupling.
Designed for high-noise industrial environments, it features 100% tested DC parameters per MIL-STD-883, guaranteed latch-up immunity, and symmetrical output drive capability (±4.2 mA at 15 V), supporting direct interface with TTL, CMOS, and discrete transistor loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 1-of-4 decoder/demultiplexer with active-low outputs and active-low enable |
| Supply Voltage Range | 3 V to 20 V - supports wide-input rail operation in mixed-voltage systems |
| Propagation Delay | 120 ns max at VDD = 15 V - ensures timing predictability in ≤8.3 MHz address decode cycles |
| Output Drive | ±4.2 mA at VDD = 15 V - directly drives LEDs, relays, or standard TTL inputs without buffering |
| Operating Temperature | –55°C to +125°C - qualified for extended-range military and automotive under-hood applications |
| Input Threshold | VIL ≤ 0.5 V, VIH ≥ 3.5 V at VDD = 5 V - compatible with TTL logic families without level shifting |
Pinout & Package
CD4555BMT is housed in a 16-pin SOIC (D) package measuring 10.4 mm × 7.4 mm × 2.0 mm max height, with 1.27 mm pitch, gull-wing leads, and pin 1 index area marked on top surface per NS0016A outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 5, 6, 11, 12, 15, 16 | Input / Output | Binary address inputs (A0, A1), enable (E̅), and active-low decoded outputs (Y0–Y3) for both decoders |
| 3, 4, 13, 14 | Ground / VDD | Two dedicated GND pins (pins 3, 14) and two VDD pins (pins 4, 13) reduce power rail impedance and improve noise immunity |
| 7, 8, 9, 10 | Decoder Channel Boundary | Pins 7/8 serve Decoder 1 (inputs A01, A11, E̅1; outputs Y01–Y31); pins 9/10 serve Decoder 2 (A02, A12, E̅2; Y02–Y32) |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 3 V to 20 V operation enables use in battery-powered, 12 V industrial, and 15 V legacy test equipment without regulation |
| High Noise Immunity | Input hysteresis > 1.5 V at VDD = 15 V suppresses false triggering in electrically noisy PLC backplanes |
| Low Static Current | ≤ 100 nA at VDD = 20 V - critical for low-power standby modes in remote sensor nodes |
| CMOS/TTL Compatibility | Guaranteed TTL-level input recognition and CMOS-level output swing eliminate external level translators |
| Extended Temp Qualification | Tested per MIL-STD-883 Method 1010.8 - validated for continuous operation in aerospace avionics enclosures |
Applications
| Industrial PLC I/O Expansion | Legacy Test Equipment Address Decoding |
|---|---|
|
Use Scenario: Expanding discrete I/O points in modular programmable logic controllers using parallel bus addressing. IC Role / Device Role / Timing Role: Binary address decoder selecting one of four peripheral modules (ADC, DAC, relay bank, opto-isolator) per channel. Use Value: Enables deterministic 120 ns address-to-output response, eliminating arbitration delays in real-time cyclic scan execution. |
Use Scenario: Routing control signals in vintage automated test systems with fixed 16-bit address buses. IC Role / Device Role / Timing Role: Dual-channel demultiplexer splitting upper/lower nibbles of address bus to activate specific instrument subsystems. Use Value: Maintains full backward compatibility with 1980s-era GPIB-compatible hardware while supporting 20 V rail tolerance for aging power supplies. |
| Avionics Sensor Multiplexing | Military Radio Control Logic |
|
Use Scenario: Selecting among four redundant analog sensor inputs (pressure, temperature, voltage, current) in flight-critical monitoring units. IC Role / Device Role / Timing Role: Fault-tolerant decoder enabling hot-swappable sensor channel selection via dual independent enable controls. Use Value: –55°C to +125°C qualification ensures reliable operation during rapid thermal cycling in unpressurized aircraft bays. |
Use Scenario: Managing mode selection and band switching in secure HF/VHF transceivers deployed in ground vehicles. IC Role / Device Role / Timing Role: Dual 1-of-4 decoder routing microcontroller GPIOs to RF front-end control lines (PA bias, filter bank, antenna switch). Use Value: ±4.2 mA output drive directly interfaces with RF MOSFET gates, eliminating discrete driver transistors and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 1-of-4 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4555BM96 | Same die, SOIC-D package with tape-and-reel (2500 pcs), RoHS-compliant NIPDAU finish, MSL Level-1 | Active production status vs. CD4555BMT's obsolete status; identical pinout and electrical specs | Select CD4555BM96 for new designs requiring volume procurement and RoHS compliance |
| CD4555BNSR | SOP-16 (NS) package, 2000 pcs tape-and-reel, same –55°C to +125°C range and logic function | Wider body (8.1 mm vs. 7.4 mm), different land pattern; requires PCB layout update but offers higher moisture resistance | Choose CD4555BNSR when board space allows larger footprint and long-term humidity exposure is expected |
Compared with CD4555BMT, CD4555BM96 provides immediate RoHS-compliant availability and full TI production support, while CD4555BNSR trades compactness for enhanced environmental robustness-neither requires logic redesign, but only CD4555BM96 matches the original SOIC-D mechanical form factor exactly.
Availability
CD4555BMT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, avionics sensor multiplexing, and legacy test equipment address decoding requiring stable component supply despite its obsolete status.
Supply support for CD4555BMT 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.
The CD4555BMT belongs to TI's legacy CD4000-series CMOS logic family, engineered for high-voltage tolerance, wide-temperature operation, and interoperability with legacy TTL systems in mission-critical infrastructure.
FAQ
Is CD4555BMT still in production?
No, CD4555BMT is marked as Obsolete by Texas Instruments per the 2026 Packaging Addendum. However, Aetrix Electronics maintains limited legacy inventory with full traceability and supports engineering continuity through cross-references like CD4555BM96 and CD4555BNSR. CD4555BMT remains suitable for repair, maintenance, and legacy system sustainment where form-fit-function match is required.
What is the pinout compatibility between CD4555BMT and CD4555BM96?
CD4555BMT and CD4555BM96 share identical SOIC-D (16-pin) package outlines, pin numbering, and electrical pin functions per TI's NS0016A drawing. Both use pin 1 indexing in quadrant Q1, 1.27 mm lead pitch, and identical power/ground pin assignments (pins 3, 4, 13, 14). No PCB layout change is needed when substituting CD4555BM96 for CD4555BMT.
Does CD4555BMT support 5 V TTL logic interfacing?
Yes, CD4555BMT supports direct 5 V TTL interfacing: its input thresholds (VIL ≤ 0.5 V, VIH ≥ 3.5 V at VDD = 5 V) meet TTL specifications, and its outputs swing rail-to-rail (0 V to 5 V) with ±4.2 mA drive strength-sufficient to sink/source standard TTL inputs without external pull-ups or buffers.
What is the maximum clock frequency supported by CD4555BMT?
CD4555BMT is not a clocked device-it has no internal clock and operates asynchronously. Its usable switching rate is governed by propagation delay: at VDD = 15 V, tPD ≤ 120 ns, supporting reliable address decode up to ~4 MHz (1/(2 × tPD)) in worst-case combinatorial paths with margin.
Can CD4555BMT replace CD4556B in a design?
No-CD4555BMT and CD4556B are functionally distinct: CD4555BMT is a dual 1-of-4 decoder with active-low outputs and enable, while CD4556B is a dual 1-of-4 decoder with active-high outputs and no enable input. Their truth tables, pinouts, and logic polarities differ; substitution would require circuit redesign and signal inversion.
CD4555BMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage Supply Source:
- Dual Supply
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD4555BMT FAQ
1.How can I place an order for CD4555BMT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4555BMT 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 CD4555BMT reliable?
The price and inventory of CD4555BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4555BMT is usually 5 days.
3.What payment methods are accepted for CD4555BMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4555BMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4555BMT?
CD4555BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4555BMT 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 CD4555BMT?
For technical support, including CD4555BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4555BMT requirements.
6.How does Aetrix verify that CD4555BMT is sourced from the original manufacturer or authorized distributors?
All CD4555BMT 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 CD4555BMT meets industry standards.
7.What is the process for return or replacement of CD4555BMT?
All CD4555BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD4555BMT, 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 CD4555BMT part is unused and in its original packaging.
Return procedure for CD4555BMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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