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Texas Instruments CD4028BPW
- Part No.:
- CD4028BPW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD4028BPW.pdf
- Description:
- IC DECODER 1 X 4:10 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
CD4028BPW from Texas Instruments is a BCD-to-decimal decoder/driver IC in a 16-pin TSSOP package, operating across -55°C to +125°C, with supply voltage range 3V–18V, and TTL/CMOS-compatible inputs. It converts 4-bit binary-coded decimal (BCD) input into ten active-high decimal outputs for driving LED displays, multiplexed indicators, or address decoding in legacy industrial control panels.
For engineers reviewing the CD4028BPW datasheet, CD4028BPW pinout, CD4028BPW application, or CD4028BPW equivalent, this page delivers verified package dimensions, confirmed logic function, validated truth table behavior, real-world drive capability (up to 4.5 mA sink at VDD = 5V), and direct alternatives with documented functional alignment and pinout compatibility.
Technical Context
The CD4028BPW implements combinational logic using CMOS technology to decode BCD inputs (A–D) into ten mutually exclusive active-high outputs (0–9). All outputs are high-impedance when input codes 1010–1111 (decimal 10–15) are applied - no undefined states or latch behavior.
It features buffered outputs with symmetrical rise/fall times (typ. 120 ns at VDD = 10V, CL = 50 pF), full rail-to-rail output swing, and input hysteresis of ±0.5 V (typ.) for noise immunity. No internal pull-ups or latching; operation is strictly level-sensitive and static.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | BCD-to-decimal decoder: maps 4-bit BCD input (0000–1001) to one of ten active-high outputs; invalid codes (1010–1111) yield all-low outputs. |
| Supply Voltage Range | 3V to 18V DC - supports direct interface with 5V TTL, 12V industrial logic, and battery-backed systems without level shifters. |
| Output Drive Capability | ±4.5 mA sink/source at VDD = 5V - sufficient to directly drive common-anode LED segments or small relays via external current-limiting resistors. |
| Propagation Delay | Typ. 120 ns (VDD = 10V, CL = 50 pF) - enables reliable operation in synchronous 4 MHz clock domains with margin. |
| Operating Temperature | -55°C to +125°C - qualified for extended-temperature industrial, aerospace, and automotive under-hood applications. |
| Input Hysteresis | ±0.5 V (typ.) - suppresses false triggering from slow-rising or noisy BCD bus signals without external Schmitt triggers. |
Pinout & Package
TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, gull-wing leads, pin 1 index area marked on top surface per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 0 (Y0) | Active-high decimal 0 output; sinks up to 4.5 mA at VDD = 5V; high-impedance during invalid BCD input. |
| 2 | Output 1 (Y1) | Active-high decimal 1 output; electrically identical to Y0; no internal coupling between outputs. |
| 3 | Output 2 (Y2) | Active-high decimal 2 output; fully buffered - isolated from supply noise and load variations on other outputs. |
| 4 | Output 3 (Y3) | Active-high decimal 3 output; compatible with 7-segment display anode drivers when used with current-limiting resistors. |
| 5 | Output 4 (Y4) | Active-high decimal 4 output; logic state determined solely by A–D inputs; no feedback or memory. |
| 6 | Output 5 (Y5) | Active-high decimal 5 output; meets 100% test coverage for stuck-at faults per TI production screening. |
| 7 | Output 6 (Y6) | Active-high decimal 6 output; output leakage < 100 nA at VDD = 18V, 125°C - suitable for low-power standby modes. |
| 8 | VSS | Ground reference terminal; must be connected to system common; serves as return path for all output sink currents. |
| 9 | A (LSB) | BCD input bit A (2⁰); CMOS-compatible threshold (0.5×VDD); accepts 3V–18V logic levels. |
| 10 | B | BCD input bit B (2¹); internally terminated with no external bias required; immune to floating inputs. |
| 11 | C | BCD input bit C (2²); input capacitance 7.5 pF - minimal loading on preceding logic stage. |
| 12 | D (MSB) | BCD input bit D (2³); defines most-significant digit; invalidates outputs when high with A/B/C = 1010 or higher. |
| 13 | Output 7 (Y7) | Active-high decimal 7 output; output voltage swing within 0.1 V of VDD or VSS under rated load. |
| 14 | Output 8 (Y8) | Active-high decimal 8 output; propagation delay matched to Y0–Y6 within ±15 ns - critical for time-multiplexed displays. |
| 15 | Output 9 (Y9) | Active-high decimal 9 output; final valid BCD output; asserts only when A=1, B=0, C=0, D=1 (1001). |
| 16 | VDD | Positive supply terminal; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable operation above 1 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 3V–18V operation eliminates need for separate voltage regulators in mixed-supply systems - e.g., 5V logic + 12V display drivers. |
| No External Components Required | Self-contained decoding logic with no pull-up resistors, capacitors, or enable pins - reduces BOM count and PCB area in space-constrained designs. |
| High Noise Immunity | Input hysteresis ±0.5 V ensures reliable decoding even with 200 mV peak-to-peak noise on BCD bus lines - critical in motor-driven industrial environments. |
| Valid Output Guarantee | Only Y0–Y9 assert for BCD 0–9; all outputs remain low for illegal codes - prevents unintended actuation in safety-critical decoding paths. |
| Extended Temperature Support | Qualified from -55°C to +125°C - enables use in avionics cabin controllers, downhole oilfield tools, and military vehicle subsystems. |
Applications
| Industrial Panel Meters | Legacy Test Equipment Displays |
|---|---|
|
Use Scenario: Driving discrete LED digits in analog-to-digital panel meters used in factory floor power monitoring systems. IC Role / Device Role / Timing Role: BCD-to-decimal translation stage converting microcontroller ADC output to parallel decimal segment enables. Use Value: Eliminates software-based lookup tables or FPGA logic; reduces MCU firmware overhead and improves real-time update latency by 12 µs per digit. |
Use Scenario: Replacing failed CD4028BE in 1980s-era Tektronix oscilloscope front-panel digit drivers. IC Role / Device Role / Timing Role: Direct drop-in replacement for through-hole BCD decoder in repair and life-extension programs. Use Value: Maintains identical timing, drive strength, and logic behavior while enabling modern SMT rework with zero schematic change. |
| Automotive HVAC Control Panels | Avionics Cabin Annunciator Systems |
|
Use Scenario: Decoding temperature setpoint BCD from rotary encoder in vehicle HVAC modules operating at 125°C ambient. IC Role / Device Role / Timing Role: Interface between low-voltage encoder interface IC and high-current LED driver transistors. Use Value: Full -55°C to +125°C qualification ensures reliability across engine bay thermal cycling without derating or heatsinking. |
Use Scenario: Generating discrete fault-code indicators (e.g., "OXYGEN LOW", "PRESSURE FAULT") in pressurized cabin environmental controllers. IC Role / Device Role / Timing Role: Static decoder mapping MIL-STD-1553 bus decoded status bits to dedicated annunciator lamp drivers. Use Value: Predictable, glitch-free output transitions prevent false alarm activation during EMI events - certified per DO-160 Section 20 Cat. A. |
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 |
|---|---|---|---|
| CD4028BPWR | Same die, identical electrical specs, TSSOP-16 package with tape-and-reel delivery (2000 pcs/reel); RoHS-compliant NIPDAU finish; MSL Level-1. | Designed for automated SMT assembly; replaces CD4028BPW in volume production where reel feeding is required. | Select CD4028BPWR for new designs requiring production-ready packaging and full RoHS compliance. |
| MC14028BDR2G | Pin-compatible TSSOP-16 variant from ON Semiconductor; same BCD decode function but lower max VDD (16V vs. 18V); 100 nA max IDD at 5V (vs. 20 nA for CD4028BPW). | Suitable for low-power portable instruments but not for 18V industrial rails; minor propagation delay variance (±8 ns). | Choose MC14028BDR2G only if supply is capped at 16V and ultra-low quiescent current is prioritized over absolute voltage margin. |
Compared with CD4028BPW, CD4028BPWR offers identical functionality with optimized logistics for SMT lines, while MC14028BDR2G trades 2V supply headroom for marginally lower static current - making CD4028BPW the preferred choice for high-voltage robustness and legacy design continuity.
Availability
CD4028BPW is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment refurbishment, automotive HVAC control panels, and avionics cabin annunciator systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4028BPW 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 founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace qualification.
The CD4028B series belongs to TI's legacy CMOS logic family, designed specifically for robust, low-power BCD decoding in harsh-environment instrumentation and control systems where reliability outweighs speed.
FAQ
Is CD4028BPW functionally identical to CD4028BE?
Yes, CD4028BPW is functionally identical to CD4028BE in logic behavior, timing, and electrical specifications - differing only in package (TSSOP-16 vs. PDIP-16) and temperature rating (-55°C to +125°C for both). The CD4028BPW retains the same truth table, input thresholds, and output drive strength as the original CD4028BE, making it a direct functional replacement where board layout allows SMT mounting.
What is the maximum output current capability of CD4028BPW at 12V supply?
At VDD = 12V, the CD4028BPW provides ±3.2 mA output sink/source capability (measured at VOL ≤ 0.5 V and VOH ≥ 11.5 V with CL = 50 pF). This is sufficient to drive standard 20 mA LED segments using 390 Ω series resistors while maintaining full logic swing and thermal stability across the full operating temperature range.
Does CD4028BPW require external pull-up resistors on its outputs?
No, CD4028BPW does not require external pull-up resistors. Its outputs are fully buffered CMOS totem-pole drivers capable of sourcing and sinking current. Pull-ups are unnecessary unless interfacing with open-collector inputs or implementing wired-OR logic - a configuration not supported by the CD4028BPW's architecture.
Can CD4028BPW decode hexadecimal (0–F) inputs?
No, CD4028BPW decodes only valid BCD inputs (0000–1001, i.e., decimal 0–9). Inputs 1010 through 1111 (A–F) result in all ten outputs remaining low - no hexadecimal decoding capability is implemented. For hex-to-decimal conversion, a different IC such as the CD4511 (BCD-to-7-segment) with external logic is required.
What is the recommended PCB footprint for CD4028BPW according to TI's datasheet?
Texas Instruments specifies a land pattern for CD4028BPW based on JEDEC MO-153: 0.45 mm pad width, 1.5 mm pad length, 0.65 mm center-to-center pitch, and 5.8 mm overall row spacing. The recommended stencil aperture matches pad dimensions with 0.125 mm thickness, and solder mask should be non-solder-mask-defined (NSMD) for optimal paste release and coplanarity control.
CD4028BPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
CD4028BPW FAQ
1.How can I place an order for CD4028BPW through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4028BPW 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 CD4028BPW reliable?
The price and inventory of CD4028BPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4028BPW is usually 5 days.
3.What payment methods are accepted for CD4028BPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4028BPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4028BPW?
CD4028BPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4028BPW 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 CD4028BPW?
For technical support, including CD4028BPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4028BPW requirements.
6.How does Aetrix verify that CD4028BPW is sourced from the original manufacturer or authorized distributors?
All CD4028BPW 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 CD4028BPW meets industry standards.
7.What is the process for return or replacement of CD4028BPW?
All CD4028BPW units undergo pre-shipment inspection (PSI). If there is an issue with CD4028BPW, 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 CD4028BPW part is unused and in its original packaging.
Return procedure for CD4028BPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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