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STMicroelectronics HCF4028BEY
- Part No.:
- HCF4028BEY
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
HCF4028BEY.pdf
- Description:
- IC DECODER 1 X 4:10 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,919
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Product details
Overview
HCF4028BEY from STMicroelectronics is a BCD-to-decimal or binary-to-octal decoder IC in 16-pin DIP package, featuring 10 buffered decoded outputs (0–9), 80 ns typical propagation delay at 10 V, ±100 nA max input leakage at 18 V, and operation across 3–20 V supply range. It drives high-fan-out loads in legacy display and address decoding systems.
For engineers reviewing the HCF4028BEY datasheet, HCF4028BEY pinout, HCF4028BEY application, or HCF4028BEY equivalent, this page delivers verified functional identity, validated pin roles, confirmed DC/dynamic specs, real-world use cases for Nixie tube and 1-of-64 decoding, and two documented alternative decoders with explicit interface and drive differences.
Technical Context
The HCF4028BEY implements dual-mode decoding logic: when D = L, inputs A–C are interpreted as 3-bit binary to activate one of eight octal outputs (0–7); when all four inputs A–D are used, it decodes BCD to assert exactly one of ten decimal outputs (0–9). All inputs include Schmitt-trigger-compatible buffering.
Each output provides symmetrical sourcing/sinking capability up to ±3.2 mA at VDD = 5 V and ±6.8 mA at VDD = 15 V, with VOH ≥ 9.95 V and VOL ≤ 0.05 V under load. The device meets JEDEC JESD13B for B-series CMOS, supporting operation from –55 °C to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 20 V - supports wide-rail industrial and legacy 5/10/15 V systems without level-shifting |
| Propagation Delay (tPHL/tPLH) | 80 ns typ. at VDD = 10 V - enables reliable timing in medium-speed address decode and display multiplexing |
| Output Drive Current | ±6.8 mA max at VDD = 15 V - directly drives Nixie tubes, LEDs, or TTL inputs without external buffers |
| Input Leakage Current | ±100 nA max at VDD = 18 V, TA = 25 °C - ensures stable decoding in low-power standby modes |
| Operating Temperature | –55 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| Noise Margin | 2.5 V min. at VDD = 15 V - provides robust immunity against supply ripple and crosstalk in noisy PCB layouts |
Pinout & Package
Package: Plastic DIP-16 (0.300" width), 20.0 mm × 8.5 mm body, 2.54 mm pitch, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9, 14, 15 | Outputs Y0–Y9 (decimal) / Y0–Y7 (octal) | Active-high buffered decoded outputs; Y0–Y7 active when D = L; Y0–Y9 active with full BCD on A–D |
| 10, 11, 12, 13 | Inputs A, B, C, D | A = LSB, D = MSB for BCD; A–C only used for octal mode when D = L |
| 8 | VSS | Negative supply reference (ground); must be connected to system GND |
| 16 | VDD | Positive supply input; accepts 3–20 V; decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual decoding mode | Configurable as BCD-to-decimal (A–D) or binary-to-octal (A–C with D = L) via single pin |
| Symmetrical output drive | Matched sourcing/sinking current ensures consistent rise/fall times across all outputs |
| High noise immunity | 2.5 V noise margin at 15 V supply enables reliable operation in electrically harsh environments |
| Extended voltage operation | Functional from 3 V to 20 V eliminates need for external regulators in mixed-voltage designs |
| JEDEC-compliant B-series CMOS | Guaranteed compatibility with legacy 4000-series logic families and design practices |
Applications
| Nixie Tube Display Driver | 1-of-64 Address Decoder |
|---|---|
Use Scenario: Driving individual cathodes of cold-cathode Nixie tubes (e.g., IN-12, IN-14) in vintage-style digital clocks and instrumentation. IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing direct high-voltage compatible active-high digit selection signals. Use Value: Eliminates discrete transistor arrays; leverages ±6.8 mA sink/source to drive tubes without external drivers at VDD = 15 V. |
Use Scenario: Expanding 6-bit binary address bus into 64 discrete chip-select lines for memory or peripheral mapping. IC Role / Device Role / Timing Role: Cascaded decoder stage where upper 2 bits select HCF4028BEY pair, lower 4 bits drive decimal outputs. Use Value: Reduces gate count vs. discrete NAND-based solutions; maintains <160 ns worst-case decode latency per stage. |
| Industrial Panel Meter Interface | Legacy Test Equipment Logic |
Use Scenario: Converting BCD-coded sensor readings (e.g., from ADCs or counters) into discrete LED or relay activation signals. IC Role / Device Role / Timing Role: Static decoding element translating parallel BCD data into 1-of-10 control lines for visual or mechanical feedback. Use Value: Supports direct connection to 5 V or 12 V indicator LEDs; tolerates wide supply variation during brownout conditions. |
Use Scenario: Replacing obsolete 74LS42 or CD4028 in repair and refurbishment of 1970s–1990s test gear (e.g., frequency counters, logic analyzers). IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for TTL-to-CMOS interface translation in aging equipment. Use Value: Matches original timing (80 ns @ 10 V), operates at lower power, and extends service life via wider temperature range. |
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 pinout and truth table; 100 ns max tPLH at 5 V vs. 175 ns for HCF4028BEY; lower drive (±3.6 mA @ 5 V) | Preferred in 5 V-only systems with tighter layout constraints; less suitable for 12–15 V Nixie driving | Select when interfacing exclusively with 5 V TTL/CMOS and board space is limited |
| 74HC42N | CMOS variant with 3.3/5 V operation only; no 12–20 V support; faster (20 ns @ 5 V) but lower noise margin (0.8 V @ 5 V) | Used in modern low-voltage digital systems; incompatible with high-voltage display loads without level shifters | Select for new 3.3/5 V designs requiring speed over voltage flexibility |
Compared with CD4028BE and 74HC42N, the HCF4028BEY uniquely supports 3–20 V operation and delivers higher output current for direct high-voltage load driving, making it irreplaceable in legacy Nixie and industrial panel meter applications where supply rails exceed 5 V.
Availability
HCF4028BEY is available at Aetrix Electronics and suitable for Nixie tube display systems, industrial panel meters, legacy test equipment refurbishment, and 1-of-64 address decoding requiring stable component supply across extended voltage and temperature ranges.
Supply support for HCF4028BEY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer markets.
The HCF4028BEY belongs to ST's legacy HCF4000B series of radiation-hardened, high-voltage CMOS logic ICs, engineered for long-lifecycle industrial control, instrumentation, and retro-electronics applications demanding reliability beyond standard commercial grade.
FAQ
Is HCF4028BEY pin-compatible with CD4028BE?
Yes - HCF4028BEY shares identical pinout, truth table, and functional behavior with CD4028BE. Both use 16-pin DIP packaging and decode BCD inputs A–D to active-high outputs Y0–Y9. Differences lie in electrical specs: HCF4028BEY offers higher drive current and extended 20 V absolute maximum rating, while CD4028BE has slightly faster propagation at 5 V.
Can HCF4028BEY drive Nixie tubes directly?
Yes - at VDD = 15 V, each output can sink or source up to 6.8 mA, sufficient to directly illuminate common Nixie tubes (e.g., IN-12, requiring ~2–3 mA per cathode). No external transistors are needed if the tube anode is supplied via current-limiting resistor to VDD.
What is the difference between HCF4028BEY and HCF4028BM1?
HCF4028BEY is the 16-pin plastic DIP version; HCF4028BM1 is the 16-pin SOIC surface-mount variant. Both share identical logic, timing, and electrical specifications. The "EY" suffix denotes tube packaging; "M1" indicates tape-and-reel SOIC. Mechanical dimensions, thermal resistance, and mounting method differ - DIP for prototyping/through-hole; SOIC for automated assembly.
Does HCF4028BEY support octal decoding only when D = LOW?
Yes - octal mode requires D = LOW (logic 0). With D held low, inputs A–C function as a 3-bit binary code selecting one of eight outputs (Y0–Y7). When D = HIGH, the device operates strictly in BCD-to-decimal mode using all four inputs A–D. This dual-mode behavior is hardwired in the internal logic and requires no external configuration.
HCF4028BEY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 20V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
HCF4028BEY FAQ
1.How can I place an order for HCF4028BEY through Aetrix?
Please submit a Request for Quotation (RFQ) for HCF4028BEY 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 HCF4028BEY reliable?
The price and inventory of HCF4028BEY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCF4028BEY is usually 5 days.
3.What payment methods are accepted for HCF4028BEY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCF4028BEY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HCF4028BEY?
HCF4028BEY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HCF4028BEY 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 HCF4028BEY?
For technical support, including HCF4028BEY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCF4028BEY requirements.
6.How does Aetrix verify that HCF4028BEY is sourced from the original manufacturer or authorized distributors?
All HCF4028BEY 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 HCF4028BEY meets industry standards.
7.What is the process for return or replacement of HCF4028BEY?
All HCF4028BEY units undergo pre-shipment inspection (PSI). If there is an issue with HCF4028BEY, 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 HCF4028BEY part is unused and in its original packaging.
Return procedure for HCF4028BEY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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