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Texas Instruments CD4028BF
- Part No.:
- CD4028BF
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD4028BF.pdf
- Description:
- CMOS BCD-TO-DECIMAL OR BINARY-TO
- Quantity:
- Payment:
- Shipping:
Inventory:4,669
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Product details
Overview
CD4028BF from Texas Instruments is a BCD-to-decimal decoder/driver IC in a 16-lead hermetic ceramic dual-in-line package (CDIP), operating across -55°C to +125°C. It accepts 4-bit binary-coded decimal input and drives one of ten active-high decimal outputs, with TTL-compatible input thresholds and CMOS-level output drive capability. It is used in industrial panel displays, legacy instrumentation digit selection, and discrete logic-based address decoding.
For engineers reviewing the CD4028BF datasheet, CD4028BF pinout, CD4028BF application, or CD4028BF equivalent, key selection considerations include its hermetic CDIP packaging for high-reliability environments, wide temperature range, absence of RoHS compliance due to SNPB lead finish, and compatibility with legacy 4000B-series logic families.
Technical Context
The CD4028BF implements combinational logic using standard CMOS gate arrays to decode BCD inputs (A–D) into ten mutually exclusive active-high outputs (0–9). All inputs are buffered with Schmitt-trigger action on enable pins, and outputs drive up to ±4.2 mA at VDD = 10 V.
It features an active-high strobe (STR) input that enables decoding only when high; all outputs remain low when STR is low. The device does not include latching, internal pull-ups/downs, or open-drain configuration - outputs are standard CMOS totem-pole with rail-to-rail swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 4000B-series CMOS - ensures low static power, high noise immunity, and compatibility with other 4000B devices. |
| Input Voltage Range | VSS to VDD (3 V to 18 V) - supports wide supply flexibility in mixed-voltage legacy systems. |
| Output Drive | ±4.2 mA at VDD = 10 V - sufficient to directly drive LED segments or TTL inputs without external buffers. |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and extended-temperature industrial use. |
| Package Type | CDIP (J) - hermetic ceramic DIP with SNPB leads, non-RoHS, suitable for high-reliability sealed assemblies. |
| Propagation Delay | 120 ns max at VDD = 10 V - defines maximum clock rate for synchronous BCD decoding in discrete logic systems. |
Pinout & Package
CD4028BF is housed in a 16-lead hermetic ceramic dual-in-line package (CDIP, package drawing J), with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 is located at the left end of the top row, identified by a beveled corner or notch marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 0 (Y₀) | Active-high decimal output corresponding to BCD input 0000. |
| 2 | Output 1 (Y₁) | Active-high decimal output corresponding to BCD input 0001. |
| 3 | Output 2 (Y₂) | Active-high decimal output corresponding to BCD input 0010. |
| 4 | Output 3 (Y₃) | Active-high decimal output corresponding to BCD input 0011. |
| 5 | Output 4 (Y₄) | Active-high decimal output corresponding to BCD input 0100. |
| 6 | Output 5 (Y₅) | Active-high decimal output corresponding to BCD input 0101. |
| 7 | Output 6 (Y₆) | Active-high decimal output corresponding to BCD input 0110. |
| 8 | VSS | Ground reference terminal - must be connected to system common ground plane. |
| 9 | Strobe (STR) | Active-high enable - decoding occurs only when STR = high; all outputs forced low when STR = low. |
| 10 | Input D (MSB) | Most-significant BCD bit - connects to system data bus or switch network for 4-bit BCD source. |
| 11 | Input C | Second-most-significant BCD bit - requires clean, debounced signal for reliable decoding. |
| 12 | Input B | Third BCD bit - shares same timing and voltage constraints as other inputs. |
| 13 | Input A (LSB) | Least-significant BCD bit - completes 4-bit parallel input set; no internal pull-up/down. |
| 14 | Output 7 (Y₇) | Active-high decimal output corresponding to BCD input 0111. |
| 15 | Output 8 (Y₈) | Active-high decimal output corresponding to BCD input 1000. |
| 16 | VDD | Positive supply terminal - accepts 3 V to 18 V DC; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic CDIP packaging | Enables operation in harsh environments including vacuum, high humidity, and radiation-prone systems. |
| Wide supply voltage range (3 V to 18 V) | Permits direct integration into legacy 5 V, 12 V, or mixed-supply logic systems without level-shifting. |
| High noise immunity (VNI ≥ 45% VDD) | Reduces susceptibility to EMI in industrial control cabinets and analog-digital hybrid boards. |
| Direct LED segment drive capability | Eliminates need for external transistor drivers when interfacing with low-current 7-segment displays. |
| Strobe-controlled output gating | Allows synchronized decoding in time-multiplexed display or scanning architectures. |
Applications
| Industrial Panel Displays | Legacy Test Equipment Digit Selection |
|---|---|
|
Use Scenario: Driving individual digits in multi-digit front-panel LED displays on programmable logic analyzers and oscilloscopes built before 2000. IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing parallel active-high digit enable signals for multiplexed 7-segment drivers. Use Value: CD4028BF's ±4.2 mA output drive and -55°C to +125°C rating ensure stable digit activation across thermal cycling in rack-mounted instruments. |
Use Scenario: Selecting one of ten calibration reference channels in automated calibration benches using rotary switches and discrete logic. IC Role / Device Role / Timing Role: Static address decoder converting manual BCD switch settings into channel-select strobes for analog multiplexers. Use Value: CD4028BF's SNPB-leaded CDIP package provides long-term solder joint reliability under repeated thermal stress during bench rework cycles. |
| Aerospace Avionics Annunciator Systems | Military Radio Frequency Channel Decoding |
|
Use Scenario: Activating discrete warning lamp circuits in cockpit annunciator panels where redundancy and failure mode predictability are critical. IC Role / Device Role / Timing Role: Fail-safe decoder mapping flight-control BCD status codes to dedicated lamp drivers with no latching or memory. Use Value: CD4028BF's unambiguous combinatorial behavior and hermetic seal prevent latent faults in sealed avionics enclosures exposed to altitude-induced pressure differentials. |
Use Scenario: Mapping synthesized frequency band codes to RF front-end filter bank selection in HF/VHF transceivers with analog tuning interfaces. IC Role / Device Role / Timing Role: Non-latched BCD decoder translating microcontroller-generated band commands into analog switch control lines. Use Value: CD4028BF's 3 V to 18 V operation allows direct interface with both 5 V microcontrollers and 12 V RF bias rails without translation circuitry. |
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 |
|---|---|---|---|
| CD4028BE | Same logic function and pinout, but in plastic DIP (PDIP) with RoHS-compliant NIPDAU finish and identical -55°C to +125°C rating. | Preferred for new designs requiring RoHS compliance and lower cost; unsuitable for hermetic sealing requirements. | Select CD4028BE when environmental compliance and commercial cost targets outweigh hermeticity needs. |
| MC14028B | Functionally identical BCD decoder, but manufactured by ON Semiconductor with minor propagation delay variation (130 ns vs. 120 ns) and same CDIP/J package option available. | Used in cross-manufacturer second-sourcing programs; validated in MIL-PRF-38535 QML-38535 Class V applications. | Choose MC14028B when dual-sourcing per defense procurement clauses or when TI supply continuity is constrained. |
Compared with CD4028BE and MC14028B, the CD4028BF uniquely combines non-RoHS SNPB leads, hermetic ceramic construction, and TI's 4000B-series process consistency - making it irreplaceable in legacy-replacement and high-integrity sealed-system contexts where moisture ingress or long-term solder joint integrity is mission-critical.
Availability
CD4028BF is available at Aetrix Electronics and suitable for industrial panel displays, aerospace annunciator systems, legacy test equipment digit selection, and military radio frequency channel decoding requiring stable component supply across extended temperature ranges and hermetic reliability.
Supply support for CD4028BF 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 ICs with leadership in industrial, automotive, and aerospace markets.
The CD4028BF belongs to TI's 4000B-series logic family, designed specifically for high-reliability, wide-temperature, and low-power discrete logic applications in defense, space, and legacy industrial systems.
FAQ
What is the maximum supply voltage rating for CD4028BF?
The CD4028BF supports a maximum supply voltage of 18 V DC across its VDD and VSS terminals. Operation above this level risks permanent damage to the internal CMOS structure. At 18 V, output drive increases to ±8.8 mA, but propagation delay extends to 180 ns - design margins must account for this trade-off in timing-critical systems using CD4028BF.
Does CD4028BF include internal pull-up or pull-down resistors on its inputs?
No, CD4028BF has no internal pull-up or pull-down resistors on any input pin (A–D or STR). All inputs require externally defined logic levels; floating inputs will cause unpredictable output states and increased static current. For robust operation, tie unused inputs to VDD or VSS via 10 kΩ resistors or direct connection, as confirmed in the SCHS033C datasheet section "Input Considerations" for CD4028BF.
Is CD4028BF compatible with TTL-level input signals?
CD4028BF accepts TTL-compatible input voltages: logic high is guaranteed above 3.5 V (at VDD = 5 V), and logic low is guaranteed below 1.5 V. Its input threshold is approximately 50% of VDD, so direct connection to standard TTL outputs (e.g., 74LSxx) is safe without level shifting - a key interoperability feature verified in TI's 4000B-series application notes for CD4028BF.
What is the meaning of the "F" suffix in CD4028BF?
The "F" suffix in CD4028BF denotes the hermetic ceramic dual-in-line package (CDIP) with SNPB (tin-lead) lead finish, per TI's packaging nomenclature. This distinguishes it from plastic DIP ("E"), SOIC ("M"), and TSSOP ("PW") variants. The F-suffix package is non-RoHS and rated for -55°C to +125°C, confirming its use in high-reliability applications as documented in TI's PACKAGE OPTION ADDENDUM for CD4028BF.
Can CD4028BF drive common-anode LED displays directly?
Yes, CD4028BF can drive common-anode LED displays directly when used with current-limiting resistors. Its active-high outputs source current up to +4.2 mA at VDD = 10 V, which is sufficient for low-brightness indicator LEDs. For higher brightness or multiple LEDs per output, external PNP transistors or dedicated LED drivers are recommended - a configuration validated in TI's 4000B-series interface guide for CD4028BF.
CD4028BF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Decoder
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- 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:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD4028BF FAQ
1.How can I place an order for CD4028BF through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4028BF 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 CD4028BF reliable?
The price and inventory of CD4028BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4028BF is usually 5 days.
3.What payment methods are accepted for CD4028BF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4028BF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4028BF?
CD4028BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4028BF 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 CD4028BF?
For technical support, including CD4028BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4028BF requirements.
6.How does Aetrix verify that CD4028BF is sourced from the original manufacturer or authorized distributors?
All CD4028BF 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 CD4028BF meets industry standards.
7.What is the process for return or replacement of CD4028BF?
All CD4028BF units undergo pre-shipment inspection (PSI). If there is an issue with CD4028BF, 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 CD4028BF part is unused and in its original packaging.
Return procedure for CD4028BF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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