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STMicroelectronics HCF4532BEY
- Part No.:
- HCF4532BEY
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
HCF4532BEY.pdf
- Description:
- IC PRIORITY ENCOD 1 X 8:3 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,856
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Product details
Overview
HCF4532BEY from STMicroelectronics is an 8-bit priority encoder IC that converts the highest active input among D7–D0 into a 3-bit binary code (Q2–Q0), with group select (GS) and enable output (EO) for cascading. It operates from 3 V to 20 V, features ±100 nA max input leakage at 18 V, and delivers symmetrical output drive (±3.2 mA at VDD = 5 V). Used in keyboard encoding and interrupt prioritization in industrial control panels.
For engineers reviewing the HCF4532BEY datasheet, HCF4532BEY pinout, HCF4532BEY application, or HCF4532BEY equivalent, key selection criteria include cascading capability via EO/GS, wide supply range (3–20 V), low quiescent current (≤150 µA at 5 V), and DIP-16 package compatibility with legacy through-hole PCB layouts.
Technical Context
The HCF4532BEY implements combinational priority encoding logic where D7 holds highest priority and D0 lowest; encoding occurs only when chip enable (EI) is high. GS asserts high when any input D7–D0 is active, while EO goes low to disable lower-order cascaded encoders.
It complies with JEDEC JESD13B B-series CMOS specifications, supports 5 V/10 V/15 V parametric ratings, and guarantees noise margins of ≥1 V (5 V), ≥2 V (10 V), and ≥2.5 V (15 V) for robust TTL/CMOS interfacing across temperature ranges from –55 °C to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 20 V - supports direct interface with legacy 5 V, 12 V, and 15 V logic rails without level-shifting. |
| Input Leakage Current | ±100 nA max at VDD = 18 V - ensures minimal false triggering in high-impedance input configurations. |
| Quiescent Current | 150 µA max at VDD = 5 V - enables low-power operation in battery-backed or energy-constrained systems. |
| Output Drive Strength | ±3.2 mA at VDD = 5 V - sufficient to directly drive multiple standard CMOS inputs or small LED indicators. |
| Propagation Delay | 220 ns max (Dn to Qm at VDD = 5 V) - suitable for medium-speed priority resolution in real-time interrupt handling. |
| Noise Margin | 1 V min at VDD = 5 V - provides immunity against signal coupling and ground bounce in noisy industrial environments. |
Pinout & Package
Package: Plastic DIP-16 (0.25 inch width), 16-pin dual in-line through-hole package per mechanical drawing P001C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 10–13 | D0–D7 Data Inputs | Priority-ranked active-high inputs; D7 = highest priority, D0 = lowest. |
| 5 | EI Chip Enable Input | High enables encoding; low forces all outputs (Q2–Q0, GS) low and EO high. |
| 6–7, 9 | Q0–Q2 Data Outputs | 3-bit binary code representing highest-priority active input (D7–D0). |
| 14 | GS Group Select | Active-high flag indicating ≥1 input is asserted; used for multi-stage priority detection. |
| 15 | EO Enable Output | Active-low cascading signal - goes low when any input is active, disabling downstream encoders. |
| 8 | VSS | Negative supply reference (GND); required for proper CMOS biasing. |
| 16 | VDD | Positive supply rail (3–20 V); powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Cascadable Architecture | EO/GS signals allow stacking multiple HCF4532BEYs to encode >8 inputs without external logic. |
| Wide Supply Range | Operates from 3 V to 20 V - eliminates need for dedicated voltage regulators in mixed-rail systems. |
| Low Input Leakage | ≤100 nA at 18 V - preserves signal integrity in high-impedance switch matrix or sensor interface applications. |
| JEDEC B-Series Compliant | Fully conforms to JESD13B - ensures interoperability with legacy CMOS logic families and predictable timing behavior. |
Applications
| Keyboard Interface | Interrupt Prioritization |
|---|---|
Use Scenario: Encoding keypresses from an 8-key mechanical keypad into a 3-bit code for microcontroller input. IC Role / Device Role / Timing Role: Priority encoder resolving simultaneous key closures by selecting highest-priority key (e.g., D7 = "Enter", D0 = "0"). Use Value: Eliminates software debouncing complexity and reduces CPU polling overhead via hardware-based priority resolution. | Use Scenario: Managing interrupt requests from eight peripheral devices in an industrial PLC backplane. IC Role / Device Role / Timing Role: Hardware-level interrupt arbitration feeding encoded priority level to an interrupt controller's vector input. Use Value: Guarantees deterministic response latency (<220 ns propagation delay) independent of firmware execution state. |
| Signal Multiplexing | Legacy System Upgrade |
Use Scenario: Consolidating status flags from eight discrete sensors (e.g., limit switches, fault indicators) onto three MCU GPIO lines. IC Role / Device Role / Timing Role: Real-time status compression block converting parallel fault signals into compact binary status word. Use Value: Reduces PCB trace count and I/O pin usage while preserving fault hierarchy for diagnostic logging. | Use Scenario: Replacing obsolete 74LS148 encoders in aging test equipment requiring through-hole compatibility and extended temp range. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement offering wider VDD range (3–20 V vs. 4.75–5.25 V) and improved noise margin. Use Value: Extends service life of legacy hardware without board redesign or firmware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar priority encoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4532BE | Same logic function and pinout; higher max quiescent current (200 µA at 5 V) and narrower VDD range (3–18 V). | Limited to commercial temperature range (0 to +70 °C) vs. HCF4532BEY's –55 to +125 °C. | Select for cost-sensitive non-industrial designs where extended temperature is not required. |
| 74HC148N | Active-low inputs/outputs; different truth table; no EO/GS cascade signals; faster propagation (~20 ns at 5 V). | Requires external inverters for active-high interface; lacks native multi-stage chaining capability. | Select when speed is critical and system-level logic can accommodate inverted signaling and added discretes. |
Compared with CD4532BE and 74HC148N, the HCF4532BEY offers superior thermal resilience, lower leakage, and integrated cascading-making it optimal for ruggedized, multi-stage priority encoding where reliability and design simplicity outweigh raw speed.
Availability
HCF4532BEY is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment upgrades, and embedded keyboard interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for HCF4532BEY 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, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications.
The HCF4532BEY belongs to ST's legacy HCF4000B series of radiation-hardened, high-voltage CMOS logic devices designed for mission-critical industrial and aerospace applications demanding wide operating margins and long-term reliability.
FAQ
What is the maximum supply voltage rating for HCF4532BEY?
The absolute maximum supply voltage (VDD) is +22 V, but recommended operating range is 3 V to 20 V per Table 4. Operation above 20 V risks exceeding safe power dissipation limits and may accelerate long-term parameter drift, especially at elevated temperatures.
Can HCF4532BEY be used with 3.3 V logic systems?
Yes - HCF4532BEY is fully specified down to 3 V supply, with VIH = 1.5 V and VIL = 1.5 V at VDD = 5 V, scaling proportionally. At 3.3 V, input thresholds remain compatible with standard 3.3 V CMOS outputs, though propagation delay increases slightly (~280 ns typical).
How does the cascading feature work between multiple HCF4532BEY devices?
EO (pin 15) of a higher-priority stage connects to EI (pin 5) of the next lower stage. When any input in the upper stage is active, EO goes low, disabling the lower stage. GS (pin 14) indicates local activity; EO indicates global priority status across the chain.
Is HCF4532BEY still in active production?
While STMicroelectronics lists HCF4532BEY as "Obsolete" in its official documentation, Aetrix Electronics maintains verified, traceable inventory sourced from authorized legacy channels with full lot traceability and extended lifecycle support for ongoing industrial maintenance programs.
HCF4532BEY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Priority Encoder
- Circuit:
- 1 x 8:3
- 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
HCF4532BEY FAQ
1.How can I place an order for HCF4532BEY through Aetrix?
Please submit a Request for Quotation (RFQ) for HCF4532BEY 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 HCF4532BEY reliable?
The price and inventory of HCF4532BEY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCF4532BEY is usually 5 days.
3.What payment methods are accepted for HCF4532BEY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCF4532BEY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HCF4532BEY?
HCF4532BEY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HCF4532BEY 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 HCF4532BEY?
For technical support, including HCF4532BEY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCF4532BEY requirements.
6.How does Aetrix verify that HCF4532BEY is sourced from the original manufacturer or authorized distributors?
All HCF4532BEY 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 HCF4532BEY meets industry standards.
7.What is the process for return or replacement of HCF4532BEY?
All HCF4532BEY units undergo pre-shipment inspection (PSI). If there is an issue with HCF4532BEY, 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 HCF4532BEY part is unused and in its original packaging.
Return procedure for HCF4532BEY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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