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STMicroelectronics HCF4021BM1
- Part No.:
- HCF4021BM1
- Manufacturer:
- STMicroelectronics
- Category:
- Shift Registers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HCF4021BM1.pdf
- Description:
- IC SHFT REG 8STAGE STATIC 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,530
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Product details
Overview
HCF4021BM1 from STMicroelectronics is an 8-stage asynchronous parallel-input/synchronous serial-in/serial-out static shift register in PDIP-16 package, featuring 12 MHz typical clock rate at 10 V, fully static operation, and individual parallel "jam" inputs per stage. It supports dual-mode data entry (parallel asynchronous or serial synchronous), delivers buffered Q6/Q7/Q8 outputs, and operates across -55 °C to +125 °C for industrial control and automotive subsystem timing.
For engineers reviewing the HCF4021BM1 datasheet, HCF4021BM1 pinout, HCF4021BM1 application, or HCF4021BM1 equivalent, key selection criteria include parallel/serial control logic behavior, propagation delay (60–320 ns depending on VDD), quiescent current up to 20 V, and compatibility with 3–20 V supply rails in legacy CMOS systems.
Technical Context
The HCF4021BM1 implements eight D-type master-slave flip-flops with independent parallel load capability and shared clock/parallel-serial control inputs. Serial shifting occurs synchronously on the rising clock edge, while parallel jamming is asynchronous but clock-gated - the internal clock is "forced" during parallel load to ensure stage alignment.
It provides three buffered outputs (Q6, Q7, Q8) and accepts eight parallel inputs (PI-1 to PI-8), one serial input (SERIAL IN), and a single PARALLEL/SERIAL CONTROL line that selects mode. Input leakage is ≤100 nA at 18 V, and noise margin is ≥1 V (VDD = 5 V), ≥2 V (VDD = 10 V), or ≥2.5 V (VDD = 15 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-stage static shift register with dual-mode input (asynchronous parallel jam / synchronous serial shift) |
| Max Clock Frequency | 12 MHz typical at VDD = 10 V; enables high-speed data serialization in legacy CMOS logic chains |
| Supply Range | 3 V to 20 V DC; supports wide-rail industrial and automotive battery-supplied systems |
| Propagation Delay | 60–320 ns (VDD = 15 V to 5 V); determines minimum clock period and inter-stage timing margin |
| Quiescent Current | ≤100 µA at VDD = 5 V, ≤3000 µA at VDD = 20 V; specifies static power budget in always-on logic sections |
| Input Leakage | ±100 nA max at VDD = 18 V, TA = 25 °C; ensures reliable logic-level retention in high-impedance bus environments |
| ESD Rating | HBM: 2 kV, CDM: 1 kV, MM: 200 V; defines handling robustness in manual assembly and board-level integration |
Pinout & Package
Packaged in 16-pin plastic dual in-line package (PDIP-16), 0.25-inch width, with through-hole mounting and industry-standard pin spacing (2.54 mm pitch). Pin 1 is bottom-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 13 | PI-1 to PI-8 | Asynchronous parallel data inputs; each directly loads corresponding flip-flop stage on P/S = HIGH |
| 9 | PARALLEL/SERIAL CONTROL | Mode-select input: HIGH enables parallel jam; LOW enables serial shift on clock rising edge |
| 10 | CLOCK | Positive-edge-triggered master clock; forces internal clock during parallel load to synchronize all stages |
| 11 | SERIAL IN | Data input for serial shifting; sampled on rising clock edge only when P/S = LOW |
| 2, 3, 12 | Q6, Q7, Q8 | Buffered outputs from stages 6, 7, and 8; drive standard CMOS loads without external buffering |
| 8 | VSS | Negative supply rail (ground reference); must be connected before VDD to prevent latch-up |
| 16 | VDD | Positive supply rail (3–20 V); powers all internal logic and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous parallel load with synchronous clock forcing | Ensures deterministic register state capture without requiring precise setup/hold on PI lines relative to clock |
| Three buffered stage outputs (Q6, Q7, Q8) | Reduces fan-out loading on internal nodes and supports direct connection to downstream logic or LEDs |
| 100% tested quiescent current | Guarantees worst-case static power consumption across full temperature and voltage range for thermal design |
| 5 V / 10 V / 15 V parametric ratings | Provides validated performance benchmarks at common system supply rails, simplifying design reuse |
| Expandable register architecture | Enables cascading multiple HCF4021BM1 units via Q8 → SERIAL IN to build longer shift registers |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Adding discrete digital input/output points to legacy ladder-logic controllers using minimal microcontroller GPIO. IC Role / Device Role / Timing Role: Parallel-load shift register converting 8-bit parallel status into serial stream for microcontroller SPI interface. Use Value: Reduces required MCU pins by 7× while maintaining deterministic sampling of switch states under noisy factory EMI conditions. |
Use Scenario: Managing door lock actuator enable signals and window position feedback in non-safety-critical body electronics. IC Role / Device Role / Timing Role: Serial-to-parallel converter driving latched relay drivers from CAN-linked microcontroller with limited output pins. Use Value: Enables 8-channel output control using single UART or SPI line, meeting AEC-Q100 Grade 2 temperature requirements (-40 °C to +125 °C). |
| Legacy Computer Peripheral Interface | Consumer Appliance Control Panel |
|
Use Scenario: Interfacing mechanical keyboard matrix scan lines to early 8-bit microprocessors lacking dedicated peripheral ports. IC Role / Device Role / Timing Role: Parallel-input shift register capturing keypress states and serially transmitting to CPU over shared data bus. Use Value: Eliminates need for dedicated port expanders; leverages existing 5 V TTL-compatible timing margins and noise immunity. |
Use Scenario: Scanning push-button inputs and driving LED indicators on microwave oven or washing machine control panels. IC Role / Device Role / Timing Role: Dual-role shift register: parallel jam reads button matrix rows; serial shift drives LED column drivers. Use Value: Supports low-cost 4-layer PCB layout with shared clock/control lines, reducing BOM count and assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit static shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4021BE | Same pinout and logic function; lower ESD rating (HBM: 200 V vs. 2 kV), no 20 V quiescent current spec | Not qualified for extended temperature or high-reliability automotive use; suitable for commercial-grade consumer designs | Select when cost sensitivity outweighs ESD robustness and extended voltage validation needs |
| MC14021BDR2G | SOIC-16 only; identical electrical specs except slightly higher max propagation delay (350 ns @ 5 V) | Lacks PDIP-16 option; requires surface-mount assembly; same functional behavior and timing envelope | Select for automated SMT production where through-hole is not required and space is constrained |
Compared with CD4021BE and MC14021BDR2G, the HCF4021BM1 uniquely combines PDIP-16 availability, 2 kV HBM ESD rating, full 3–20 V parametric validation, and 100% quiescent current testing - making it the preferred choice for industrial and automotive applications requiring proven reliability and legacy package compatibility.
Availability
HCF4021BM1 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and legacy computer peripheral interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for HCF4021BM1 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The HCF4021BM1 belongs to ST's legacy HCMOS logic family, engineered for backward compatibility with 4000-series CMOS systems while delivering enhanced ESD robustness and extended voltage/temperature validation for modern industrial upgrades.
FAQ
What is the maximum operating voltage for HCF4021BM1?
The HCF4021BM1 supports a recommended operating supply range of 3 V to 20 V DC, with absolute maximum rating of -0.5 V to +22 V on VDD. Quiescent current is fully specified up to 20 V, and all DC/AC parameters are validated at 5 V, 10 V, and 15 V per datasheet Table 5 and Table 6.
Does HCF4021BM1 support daisy-chaining for longer shift registers?
Yes - the Q8 output can be connected to the SERIAL IN input of a second HCF4021BM1 to create a 16-bit shift register. The device's output drive strength (±1.1 mA min at VDD = 10 V) and defined transition times ensure reliable signal integrity across cascaded stages under standard 50 pF load conditions.
How does the parallel/serial control input affect timing behavior?
When PARALLEL/SERIAL CONTROL is HIGH, parallel data is loaded asynchronously but synchronized internally via forced clock gating - eliminating setup/hold timing constraints on PI lines. When LOW, serial shifting occurs strictly on rising clock edges, with 60–320 ns propagation delay depending on VDD and temperature.
Is HCF4021BM1 suitable for automotive applications?
The HCF4021BM1 is rated for -55 °C to +125 °C operation and meets 2 kV HBM ESD, making it suitable for under-hood and cabin electronics. While not AEC-Q100 qualified itself, its HCF4021Y variant is automotive-grade; BM1 is commonly used in non-safety-critical automotive subsystems where extended temperature and robustness are required.
HCF4021BM1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Shift Register
- Output Type:
- Push-Pull
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Function:
- Parallel or Serial to Serial
- Voltage - Supply:
- 3V ~ 20V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
HCF4021BM1 FAQ
1.How can I place an order for HCF4021BM1 through Aetrix?
Please submit a Request for Quotation (RFQ) for HCF4021BM1 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 HCF4021BM1 reliable?
The price and inventory of HCF4021BM1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCF4021BM1 is usually 5 days.
3.What payment methods are accepted for HCF4021BM1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCF4021BM1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HCF4021BM1?
HCF4021BM1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HCF4021BM1 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 HCF4021BM1?
For technical support, including HCF4021BM1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCF4021BM1 requirements.
6.How does Aetrix verify that HCF4021BM1 is sourced from the original manufacturer or authorized distributors?
All HCF4021BM1 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 HCF4021BM1 meets industry standards.
7.What is the process for return or replacement of HCF4021BM1?
All HCF4021BM1 units undergo pre-shipment inspection (PSI). If there is an issue with HCF4021BM1, 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 HCF4021BM1 part is unused and in its original packaging.
Return procedure for HCF4021BM1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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