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STMicroelectronics M74HC533B1R
- Part No.:
- M74HC533B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC533B1R.pdf
- Description:
- IC LATCH OCTAL D-TYPE 20-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
M74HC533B1R from STMicroelectronics is a high-speed CMOS octal D-type latch with 3-state inverting outputs, designed for bus-oriented data latching and isolation in digital systems. It features 8-bit transparent latching controlled by LE, 3-state output enable (OE), propagation delay of 12 ns (typ. at VCC = 6 V), symmetrical output drive (±6 mA), and operates across 2 V to 6 V. Used in microcontroller address/data bus buffering and memory interface control.
For engineers reviewing the M74HC533B1R datasheet, M74HC533B1R pinout, M74HC533B1R application, or M74HC533B1R equivalent, key selection criteria include latch enable timing (tW(H) = 6 ns min at 6 V), 3-state disable time (tPHZ = 13 ns max), input noise immunity (VNIH/VNIL = 28% VCC min), and DIP-20 package compatibility with legacy 74-series layouts.
Technical Context
The M74HC533B1R implements an 8-bit edge-triggered latch architecture where Q outputs follow D inputs only while LE is HIGH; latching occurs on LE transition to LOW. Its 3-state outputs are actively driven HIGH/LOW when OE is LOW and enter high-impedance (Z) when OE is HIGH - enabling bidirectional bus sharing without external logic.
All inputs include silicon gate C2MOS ESD protection, and output drive capability is balanced (|IOH| = IOL ≥ 6 mA at VCC = 4.5 V and 6 V), ensuring matched rise/fall times (tPLH ≅ tPHL) and low skew in synchronous bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU with 5 V peripherals) |
| tPD (Propagation Delay) | 12 ns (typ. at VCC = 6 V) - enables ≤40 MHz bus operation with margin for setup/hold |
| IOL / IOH | ≥6 mA (min at VCC = 4.5 V) - drives standard TTL loads and multiple CMOS inputs without fanout limitation |
| VNIH / VNIL | 28% VCC (min) - provides robust noise rejection against ground bounce and crosstalk in dense PCB layouts |
| ICC (Quiescent) | 4 µA (max at TA = 25°C) - enables ultra-low static power in battery-backed or always-on control logic |
| Output Leakage (IOZ) | ±5 µA (max at TA = 85°C) - ensures reliable high-Z state retention during hot-swap or partial power-down |
| Input Capacitance | 5 pF (typ.) - minimizes loading on upstream drivers and preserves signal integrity at high frequencies |
Pinout & Package
Package: Plastic DIP-20 (0.300" wide), JEDEC MS-001, 2.54 mm pitch, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Active LOW) | Global 3-state control: LOW enables normal Q outputs; HIGH forces all Q0–Q7 into high-impedance |
| 2,5,6,9,12,15,16,19 | Q0–Q7 (Inverting Outputs) | Inverted latched data outputs; drive bus lines only when OE = LOW and LE has latched |
| 3,4,7,8,13,14,17,18 | D0–D7 (Data Inputs) | Asynchronous data inputs; sampled and inverted at Q when LE transitions LOW |
| 11 | LE (Latch Enable) | Edge-sensitive control: rising-to-falling transition captures Dn and holds Qn until next LE pulse |
| 10 | GND | Reference ground for all input thresholds and output voltage levels |
| 20 | VCC | Positive supply rail; must be decoupled locally (0.1 µF ceramic) due to fast switching current transients |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible with 74LS533 | Direct drop-in replacement for legacy TTL bus latches without redesigning PCB layout or logic timing |
| Symmetrical output drive | Matched |IOH| and IOL ensure equal rise/fall times (tTLH ≈ tTHL), reducing bus skew in multi-drop systems |
| Balanced propagation delays | tPLH ≅ tPHL guarantees consistent timing margins for both logic transitions, simplifying timing analysis |
| Wide voltage operation | 2–6 V range allows interoperability across 2.5 V, 3.3 V, and 5 V logic families without level shifters |
| High noise immunity | VNIH/VNIL = 28% VCC minimum exceeds typical 74HC series (20%), improving reliability in noisy industrial environments |
Applications
| Microcontroller Bus Interface | Memory Address Latching |
|---|---|
|
Use Scenario: Isolating and latching 8-bit address/data bus signals between an 8-bit MCU and external SRAM or peripheral ICs. IC Role / Device Role / Timing Role: Acts as a transparent latch during address phase, then holds stable address while data transfers occur; OE controls bus contention. Use Value: Eliminates need for separate address strobe logic and prevents bus conflicts during read/write cycles with shared D/A lines. |
Use Scenario: Capturing and holding lower-byte address bits (A0–A7) for multiplexed address/data buses in 8080/8085-style systems. IC Role / Device Role / Timing Role: Latches address on LE falling edge; outputs remain stable during entire memory access cycle, independent of data bus activity. Use Value: Enables use of fewer pins on legacy CPUs and reduces PCB trace count via address/data multiplexing. |
| Industrial I/O Expansion | Legacy System Upgrade |
|
Use Scenario: Buffering and isolating parallel I/O port signals in PLC modules where field-side noise requires robust input thresholds. IC Role / Device Role / Timing Role: Provides noise-immune latching of sensor status bits before transmission to controller; OE enables hot-swap-safe disconnection. Use Value: Achieves 28% VCC noise margin - 40% higher than standard HC logic - reducing false triggers in electrically harsh environments. |
Use Scenario: Replacing obsolete 74LS533 in aging test equipment or instrumentation where board space and footprint are fixed. IC Role / Device Role / Timing Role: Direct functional and pin-for-pin substitute with lower ICC, wider VCC, and improved AC performance. Use Value: Extends product lifecycle without PCB rework, while cutting quiescent power by >95% versus LS-TTL equivalents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC573N | Non-inverting outputs; identical pinout except Q0–Q7 polarity; tPD = 19 ns (typ. at 6 V) | Requires logic inversion in downstream circuitry if inverting behavior is required for bus timing | Select when system design assumes non-inverted latch outputs and timing budget allows +7 ns delay |
| 74VHC533N | Faster tPD = 7.5 ns (typ. at 5 V); higher ICC = 20 µA (max); same DIP-20 package and pinout | Better suited for high-frequency bus arbitration but increases static power in low-power standby modes | Prefer for >50 MHz bus clocking where propagation delay dominates over quiescent current |
Compared with SN74HC573N and 74VHC533N, the M74HC533B1R offers optimal balance of low ICC (4 µA), guaranteed inverting output polarity, and sufficient speed (12 ns) for sub-40 MHz embedded bus systems - making it ideal for cost-sensitive, power-constrained legacy upgrades.
Availability
M74HC533B1R is available at Aetrix Electronics and suitable for microcontroller bus interfaces, memory address latching, and industrial I/O expansion requiring stable component supply and long-term DIP-20 availability.
Supply support for M74HC533B1R 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 analog and digital portfolio coverage.
The M74HC533B1R belongs to ST's legacy HC logic family, engineered for pin-compatible migration from 74LS devices while delivering lower power, wider voltage range, and enhanced noise immunity for industrial control and instrumentation.
FAQ
Is M74HC533B1R compatible with 5 V TTL logic inputs?
Yes - its VIH(min) = 3.15 V and VIL(max) = 1.35 V at VCC = 4.5 V meet TTL input thresholds. When operated at VCC = 5 V, it reliably accepts standard TTL output levels (2.0–3.5 V HIGH, 0–0.8 V LOW) without level shifting.
What is the maximum capacitive load this device can drive reliably?
Rated for CL ≤ 50 pF per output in AC specs, but DC drive strength (IOL/IOH ≥ 6 mA) supports up to 100 pF with acceptable tPLH/tPHL degradation (<2× spec). For >50 pF, add local series termination or reduce trace length to maintain timing margins.
Does M74HC533B1R require external pull-up resistors on OE or LE?
No - OE and LE are CMOS inputs with II ≤ ±1 µA (max), so they may be driven directly from MCU GPIO or other logic outputs. Pull-ups are unnecessary unless open-drain driving or fail-safe default states are required in system-level fault handling.
Can M74HC533B1R operate at -40°C ambient temperature?
Yes - its specified operating temperature range is -55°C to +125°C. At -40°C, all DC parameters (VIH, VOL, etc.) and AC timing (tPD, tPZH) remain within published limits, validated per STMicroelectronics' industrial-grade qualification testing.
M74HC533B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 1:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 2V ~ 6V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 12ns
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
M74HC533B1R FAQ
1.How can I place an order for M74HC533B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC533B1R 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 M74HC533B1R reliable?
The price and inventory of M74HC533B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC533B1R is usually 5 days.
3.What payment methods are accepted for M74HC533B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC533B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC533B1R?
M74HC533B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC533B1R 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 M74HC533B1R?
For technical support, including M74HC533B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC533B1R requirements.
6.How does Aetrix verify that M74HC533B1R is sourced from the original manufacturer or authorized distributors?
All M74HC533B1R 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 M74HC533B1R meets industry standards.
7.What is the process for return or replacement of M74HC533B1R?
All M74HC533B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC533B1R, 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 M74HC533B1R part is unused and in its original packaging.
Return procedure for M74HC533B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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