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Texas Instruments CD4028BMT
- Part No.:
- CD4028BMT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4028BMT.pdf
- Description:
- IC DECODER 1 X 4:10 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:853
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Product details
Overview
CD4028BMT from Texas Instruments is a BCD-to-decimal decoder IC in a 16-pin SOIC package, operating across -55°C to +125°C, with supply voltage range 3V–18V, static current ≤1µA at 5V, and propagation delay 120ns max at 10V. It converts 4-bit binary-coded decimal inputs into ten active-high decimal outputs for digital display and control logic.
For engineers reviewing the CD4028BMT datasheet, CD4028BMT pinout, CD4028BMT application, or CD4028BMT equivalent, key selection considerations include its CMOS-compatible input thresholds, TTL-level output drive capability, wide VDD tolerance, and compatibility with legacy 4000-series logic families in industrial and instrumentation systems.
Technical Context
The CD4028BMT implements combinational logic decoding using standard CMOS NAND/NOR gate structures, with no internal latching or clocking-outputs respond asynchronously to input changes. Its truth table strictly follows BCD encoding (0000–1001), with invalid inputs (1010–1111) driving all outputs low.
Input hysteresis is absent; inputs are compatible with both CMOS and buffered TTL logic levels. Output structure is standard CMOS push-pull, capable of sourcing/sinking ±4.2mA at VDD = 15V, enabling direct LED drive with series resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | BCD-to-decimal decoder: maps 4-bit BCD inputs (A–D) to 10 active-high outputs (0–9) |
| Supply Voltage Range | 3V to 18V DC: supports battery-powered, industrial, and mixed-voltage system integration |
| Operating Temperature | -55°C to +125°C: qualified for extended-temperature industrial and automotive under-hood applications |
| Propagation Delay | 120ns max at VDD = 10V, CL = 50pF: ensures timing predictability in synchronous counter-decoder chains |
| Input Leakage Current | ≤100nA at VDD = 18V, 25°C: enables ultra-low-power standby operation in energy-constrained designs |
| Output Drive | ±4.2mA at VDD = 15V: sufficient to directly drive common-anode 7-segment displays via current-limiting resistors |
Pinout & Package
CD4028BMT is housed in a 16-pin SOIC (D) package, 3.9mm wide, 9.9mm long, 1.75mm max height, with 1.27mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 6, 7 | BCD Inputs (A, B, C, D) | Active-high inputs accepting standard CMOS/TTL logic levels; A = LSB, D = MSB |
| 3–5, 9–11, 13, 14 | Decimal Outputs (0–9) | Active-high decoded outputs; only one asserted per valid BCD input; all low for invalid codes |
| 12 | VDD | Positive supply terminal; must be decoupled locally with 0.1µF ceramic capacitor |
| 8 | VSS | Ground reference; requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 3V–18V operation eliminates need for level-shifting in multi-rail systems |
| No Latch Required | Combinational decoding enables use with free-running counters without additional clock synchronization |
| High Noise Immunity | CMOS input threshold at ~50% VDD provides robust rejection of power-supply ripple and crosstalk |
| Low Static Power | Sub-microamp quiescent current allows inclusion in always-on monitoring circuits without battery drain |
Applications
| Digital Panel Meter Display | Industrial Counter Interface |
|---|---|
Use Scenario: Driving discrete LEDs or common-anode 7-segment displays in analog-to-digital converter readouts. IC Role / Device Role / Timing Role: Decoder translating BCD output from ADC or microcontroller GPIO to digit-select signals. Use Value: Eliminates software-based decoding overhead and reduces MCU I/O count by offloading digit selection logic. | Use Scenario: Interfacing with mechanical or electronic decade counters in test equipment and process timers. IC Role / Device Role / Timing Role: Synchronizing counter state to visual indicators or relay activation logic. Use Value: Provides deterministic, glitch-free output transitions aligned with counter clock edges for reliable actuation. |
| Legacy System Logic Upgrade | Automotive Instrument Cluster |
Use Scenario: Replacing obsolete TTL 74LS42 in retrofitted control panels requiring lower power and wider voltage support. IC Role / Device Role / Timing Role: Pin-compatible functional replacement for BCD decoding in aging infrastructure. Use Value: Enables drop-in upgrade path without PCB redesign while extending operational temperature range and reducing heat dissipation. | Use Scenario: Decoding vehicle speed or RPM signals from microcontroller BCD-formatted outputs to analog gauge drivers. IC Role / Device Role / Timing Role: Signal conditioning stage between digital controller and electromechanical display subsystems. Use Value: Supports extended-temperature reliability (-55°C to +125°C) required for under-dash automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-decimal decoding applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4028BM96 | Same die, identical electrical specs, SOIC-D package with tape-and-reel packaging (2500 pcs/reel) | Active production status vs. CD4028BMT's obsolete status; same footprint and thermal profile | Select CD4028BM96 for new designs requiring volume procurement and guaranteed supply continuity |
| CD4028BNSR | Same functionality, SOP-16 package (NS drawing), 2000 pcs/reel, same -55°C to +125°C rating | Slightly wider body (5.3mm vs. 3.9mm) and longer lead form; requires board layout adjustment | Choose CD4028BNSR when SOIC-D footprint is unavailable and SOP-16 assembly infrastructure is established |
Compared with CD4028BMT, CD4028BM96 offers assured availability and identical performance in the same SOIC-D package, while CD4028BNSR provides functional equivalence in a physically distinct SOP package-neither is pin-compatible with CD4028BMT due to differing package dimensions and lead forms.
Availability
CD4028BMT is available at Aetrix Electronics and suitable for industrial instrumentation, legacy system repair, and automotive diagnostics equipment requiring stable component supply despite its obsolete status.
Supply support for CD4028BMT 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The CD4028BMT belongs to TI's legacy 4000-series CMOS logic family, designed for high-noise-immunity, low-power digital decoding in harsh-environment applications where reliability and wide supply tolerance are critical.
FAQ
What is the function of the CD4028BMT?
The CD4028BMT is a BCD-to-decimal decoder that accepts four binary-coded decimal inputs (A–D) and drives exactly one of ten active-high outputs (0–9) corresponding to the input value. It operates combinatorially with no internal storage, making it ideal for real-time decoding of counter outputs or microcontroller BCD data. The CD4028BMT does not decode hexadecimal values-inputs 1010 through 1111 force all outputs low.
Is the CD4028BMT still in production?
No, the CD4028BMT is marked as Obsolete in TI's official packaging documentation. While limited legacy stock may exist, TI no longer manufactures this specific variant. Engineers designing new systems should consider the actively produced CD4028BM96 or CD4028BNSR as functional alternatives with verified supply chains and identical core functionality.
What package type is used for the CD4028BMT?
The CD4028BMT uses a 16-pin SOIC (Small Outline Integrated Circuit) package designated as "D" in TI's package drawings, measuring 3.9mm wide × 9.9mm long × 1.75mm maximum height, with 1.27mm lead pitch and NiPdAu lead finish. This matches the industry-standard SOIC-Narrow footprint and is compatible with standard SOIC reflow profiles.
Can the CD4028BMT drive LEDs directly?
Yes, the CD4028BMT can drive LEDs directly when used with appropriate current-limiting resistors. At VDD = 15V, each output can sink or source up to ±4.2mA, sufficient for low-current indicator LEDs. For common-anode 7-segment displays, connect segment anodes to VDD and use CD4028BMT outputs to pull cathodes low through 1–2kΩ resistors.
What is the maximum operating temperature for the CD4028BMT?
The CD4028BMT is rated for operation from -55°C to +125°C, consistent with TI's extended-temperature qualification for industrial and automotive applications. This specification applies across the full 3V–18V supply range and is validated per JEDEC JESD22-A108 stress testing protocols.
CD4028BMT 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
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD4028BMT FAQ
1.How can I place an order for CD4028BMT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4028BMT 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 CD4028BMT reliable?
The price and inventory of CD4028BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4028BMT is usually 5 days.
3.What payment methods are accepted for CD4028BMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4028BMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4028BMT?
CD4028BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4028BMT 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 CD4028BMT?
For technical support, including CD4028BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4028BMT requirements.
6.How does Aetrix verify that CD4028BMT is sourced from the original manufacturer or authorized distributors?
All CD4028BMT 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 CD4028BMT meets industry standards.
7.What is the process for return or replacement of CD4028BMT?
All CD4028BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD4028BMT, 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 CD4028BMT part is unused and in its original packaging.
Return procedure for CD4028BMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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