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STMicroelectronics HCF4042BEY
- Part No.:
- HCF4042BEY
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
HCF4042BEY.pdf
- Description:
- IC LATCH QUAD CLOCK D 16-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,596
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Product details
Overview
HCF4042BEY from STMicroelectronics is a quad clocked D latch IC with polarity-controlled transparent/latched operation, 4 independent data latches sharing one common clock and one polarity-select input, Q/Q complementary buffered outputs per latch, and guaranteed operation from 3V to 20V supply. It is used in digital control logic, bus interface synchronization, and level-sensitive data capture in industrial timing systems.
For engineers reviewing the HCF4042BEY datasheet, HCF4042BEY pinout, HCF4042BEY application, or HCF4042BEY equivalent, key selection criteria include clock-edge vs. level sensitivity configuration, VDD operating range up to 20V, symmetrical output drive (±1.1 mA at 5V), low quiescent current (≤30 µA at 5V), and DIP-16 package compatibility with legacy through-hole designs.
Technical Context
The HCF4042BEY implements four independent CMOS transmission-gate-based D latches, each with identical electrical characteristics and buffered complementary outputs. Latch behavior is determined by the POLARITY input: when LOW, data transfers on CLOCK LOW; when HIGH, data transfers on CLOCK HIGH - enabling flexible synchronization without external inverters.
Its symmetrical n- and p-channel output stage ensures matched VOH/VOL and balanced rise/fall times (100 ns typ. at 5V). All DC and dynamic parameters - including setup/hold times (50 ns/120 ns min at 5V), propagation delays (110–450 ns), and noise margins (1V min at 5V) - are fully specified across −55°C to +125°C and VDD = 3–20 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 3 V to 20 V - supports wide-supply industrial and automotive logic interfacing without level shifters |
| Quiescent Current | ≤30 µA at VDD = 5 V - enables ultra-low-power standby in battery-backed control circuits |
| Output Drive | ±1.1 mA at VDD = 5 V - sufficient to drive 10 LS-TTL loads or 20 CMOS inputs directly |
| Propagation Delay | 110 ns (min) / 220 ns (typ) from D to Q at 5 V - defines maximum data-throughput rate in synchronous logic |
| Noise Margin | 1 V (min) at VDD = 5 V - ensures robust immunity against supply/ground bounce in noisy environments |
| Input Leakage | ±0.1 µA max at VDD = 18 V - preserves signal integrity in high-impedance sensor interface nodes |
Pinout & Package
Supplied in 16-pin plastic dual in-line package (DIP-16), 0.3-inch body width, standard through-hole mounting with 2.54 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 10, 11 | Q1–Q4 | True (non-inverted) buffered latch outputs - drive external logic or indicators directly |
| 3, 9, 12, 15 | Q1–Q4 | Complementary (inverted) buffered latch outputs - enable differential signaling or active-low control |
| 4, 7, 13, 14 | D1–D4 | Data inputs - sampled and held based on CLOCK level and POLARITY state |
| 5 | CLOCK | Common level-sensitive strobe - controls transfer timing for all four latches simultaneously |
| 6 | POLARITY | Mode select - LOW enables latch-on-CLOCK-LOW; HIGH enables latch-on-CLOCK-HIGH |
| 8 | VSS | Negative supply reference (GND) - must be connected to system ground plane |
| 16 | VDD | Positive supply rail - powers all internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Level-triggered latching with polarity control | Single POLARITY pin configures all four latches for either clock-high or clock-low sampling - eliminates need for external clock inversion |
| Matched Q/Q output impedance | Identical n- and p-channel pull-up/pull-down strength ensures symmetrical VOH/VOL and minimal duty-cycle distortion |
| Wide VDD tolerance (3–20 V) | Operates across multiple logic families (5V TTL, 10V/15V industrial logic) without external regulators |
| 100% tested quiescent current | Guaranteed ≤30 µA at 5V ensures predictable power budgeting in low-power embedded controllers |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Logic |
|---|---|
Use Scenario: Capturing parallel status signals from field sensors (e.g., limit switches, pressure transducers) synchronized to a master controller's clock. IC Role / Device Role / Timing Role: Quad D latch providing level-sensitive data capture with configurable clock polarity to match host processor timing requirements. Use Value: Eliminates need for discrete flip-flops and glue logic; single IC handles four independent channels with shared clock and polarity control. | Use Scenario: Interfacing 8-bit microcontroller address/data buses to peripheral devices requiring hold-time compliance and voltage-level translation. IC Role / Device Role / Timing Role: Data latch isolating bus segments during read/write cycles, with polarity selection matching CPU strobe edge definition. Use Value: Ensures setup/hold timing margins (50 ns setup, 120 ns hold at 5V) meet legacy 8080/Z80 timing specifications. |
| Power Supply Sequencing Control | Test Equipment Signal Conditioning |
Use Scenario: Enabling/disabling multiple DC-DC converter rails in sequence using a centralized timing controller. IC Role / Device Role / Timing Role: Level-sensitive latch holding enable signals stable during power-up/down transitions under programmable clock polarity. Use Value: Prevents race conditions between rails by guaranteeing deterministic latch behavior over full −55°C to +125°C temperature range. | Use Scenario: Capturing analog-to-digital converter outputs in automated test equipment where sample validity depends on precise clock window alignment. IC Role / Device Role / Timing Role: Synchronizing multi-channel ADC data into a common time domain using externally generated strobe and polarity-selectable sampling window. Use Value: Achieves <100 ns propagation delay variation across channels, supporting sub-microsecond timestamp resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4042BE | Same pinout and function but not 100% quiescent current tested; higher max IDD (100 µA at 5V vs. 30 µA) | Limited to commercial temperature range (0–70°C); unsuitable for extended industrial use | Select only for cost-sensitive, non-critical ambient applications with relaxed power and temp specs |
| MC14042BDR2G | Identical JEDEC B-series spec compliance; tighter VOL (0.03 V typ) but lower output drive (±0.8 mA at 5V) | SOIC-16 only - no DIP option; requires PCB redesign for through-hole legacy systems | Prefer for new SOIC-based designs needing marginally better low-level noise immunity |
Compared with CD4042BE and MC14042BDR2G, the HCF4042BEY uniquely combines DIP-16 packaging, −55°C to +125°C operation, 100% IDD screening, and symmetrical drive - making it optimal for ruggedized, drop-in-replacement industrial control upgrades.
Availability
HCF4042BEY is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface logic, and power supply sequencing control requiring stable component supply across extended temperature and voltage ranges.
Supply support for HCF4042BEY 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 analog, MCU, power, and automotive-grade ICs for industrial, consumer, and automotive markets.
The HCF4042BEY belongs to ST's legacy HCMOS B-series logic family, engineered for high-noise-immunity, wide-supply-voltage operation in harsh industrial environments - not general-purpose logic but mission-critical timing and control.
FAQ
What is the maximum clock frequency supported by HCF4042BEY?
The HCF4042BEY does not specify a maximum clock frequency because it is a level-sensitive latch, not an edge-triggered flip-flop. Its usable clock rate is limited by minimum pulse width: 200 ns at VDD = 5 V, 100 ns at 10 V, and 60 ns at 15 V. Designers must ensure clock HIGH and LOW periods both exceed these values for reliable data capture.
Can HCF4042BEY drive LEDs directly?
Yes - each Q or Q output can sink or source up to ±1.1 mA at VDD = 5 V, sufficient to drive low-current indicator LEDs (e.g., 2 mA @ 1.8 V forward voltage) with a series resistor ≥1 kΩ. For higher-brightness LEDs or multiplexed displays, external buffer transistors are recommended due to cumulative current limits per package (200 mW total PD).
Is HCF4042BEY RoHS compliant?
Yes - the HCF4042BEY (DIP-16 package) manufactured by STMicroelectronics meets RoHS Directive 2011/65/EU. Lead-free finish is applied to all leads, and the molding compound contains no restricted substances above threshold limits. Full compliance documentation is available upon request from Aetrix Electronics.
How does POLARITY input affect timing behavior?
When POLARITY = 0, the latch captures D-input data while CLOCK is LOW; when POLARITY = 1, capture occurs while CLOCK is HIGH. In both cases, outputs hold data until the next qualifying clock level transition. This allows seamless integration with processors using either active-low or active-high strobes without modifying clock generation hardware.
HCF4042BEY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 4:4
- Output Type:
- Differential
- Voltage - Supply:
- 3V ~ 20V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 40ns
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
HCF4042BEY FAQ
1.How can I place an order for HCF4042BEY through Aetrix?
Please submit a Request for Quotation (RFQ) for HCF4042BEY 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 HCF4042BEY reliable?
The price and inventory of HCF4042BEY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCF4042BEY is usually 5 days.
3.What payment methods are accepted for HCF4042BEY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCF4042BEY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HCF4042BEY?
HCF4042BEY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HCF4042BEY 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 HCF4042BEY?
For technical support, including HCF4042BEY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCF4042BEY requirements.
6.How does Aetrix verify that HCF4042BEY is sourced from the original manufacturer or authorized distributors?
All HCF4042BEY 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 HCF4042BEY meets industry standards.
7.What is the process for return or replacement of HCF4042BEY?
All HCF4042BEY units undergo pre-shipment inspection (PSI). If there is an issue with HCF4042BEY, 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 HCF4042BEY part is unused and in its original packaging.
Return procedure for HCF4042BEY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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