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STMicroelectronics 74V1G77STR
- Part No.:
- 74V1G77STR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- SC-74A, SOT-753
- Datasheet:
-
74V1G77STR.pdf
- Description:
- IC LATCH SGL D-TYPE SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
74V1G77STR from STMicroelectronics is a single D-type latch IC in SOT23-5L package, operating from 2V to 5.5V with 4.4ns typical propagation delay at 5V, ±8mA symmetrical output drive, and input tolerance up to 7V independent of VCC. It functions as a level-sensitive data latch in portable logic interfaces, enabling voltage-level translation between 5V and 3V systems.
For engineers reviewing the 74V1G77STR datasheet, 74V1G77STR pinout, 74V1G77STR application, or 74V1G77STR equivalent, key selection criteria include latch enable timing (tW = 3.0ns min at 5V), setup/hold times (ts = 2.0ns, th = 1.0ns), ESD-protected I/O, and power-down input protection for mixed-voltage board design.
Technical Context
The 74V1G77STR implements a transparent D-latch controlled by a single Latch Enable (LE) input: Q follows D when LE is HIGH; Q holds D's logic state when LE transitions LOW. Its C2MOS sub-micron silicon gate process enables rail-to-rail input tolerance (–0.5V to +7.0V) and latch stability across –55°C to +125°C.
It features symmetrical output impedance (|IOH| = |IOL| ≥ 8mA at VCC = 4.5V), balanced tPLH/tPHL propagation delays, and 1µA max ICC at 25°C - supporting ultra-low-power operation while maintaining high-speed performance (tPD = 4.4ns typ. at 5V, CL = 15pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - supports dual-supply interface between 3.3V and 5V domains without level shifters |
| tPD (LE→Q) | 4.4ns typical at VCC = 5V, CL = 15pF - enables sub-200MHz latch operation in synchronous logic paths |
| IOL / IOH | ≥8mA at VCC = 4.5V - drives standard TTL loads and multiple CMOS inputs directly |
| VI Absolute Max | –0.5V to +7.0V - allows safe input overvoltage during hot-swap or supply sequencing |
| ICC (Quiescent) | 1µA max at TA = 25°C - minimizes standby power in battery-powered latching circuits |
| ESD Protection | HBM ≥ 2kV - integrated input/output protection eliminates need for external TVS diodes |
Pinout & Package
SOT23-5L package: 5-pin surface-mount, 1.3mm height, 2.8 × 1.5mm footprint, lead pitch 0.95mm, RoHS-compliant, tape-and-reel delivery (74V1G77STR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - D | Data Input | Asynchronous data source; sampled on LE HIGH, latched on LE LOW transition |
| 2 - LE | Latch Enable Input | Active-HIGH control: Q tracks D when HIGH; Q holds value when LOW |
| 3 - GND | Ground Reference | 0V return path for all internal logic and output drivers |
| 4 - Q | True Output | CMOS-compatible output reflecting latched D state; drives capacitive loads ≤50pF |
| 5 - VCC | Positive Supply | Primary power rail; supplies internal logic and output stage; tolerant of slow ramp-up |
Key Features
| Feature | Design Value |
|---|---|
| Input Overvoltage Tolerance | Supports 0–7V input regardless of VCC - enables robust interfacing in mixed-rail systems |
| Power-Down Input Protection | Inputs remain high-impedance and non-destructive when VCC = 0V - prevents backfeeding |
| Symmetrical Output Drive | IOH = IOL ≥ 8mA ensures matched rise/fall times and consistent signal integrity |
| Wide Temperature Range | Operates from –55°C to +125°C - qualified for industrial and automotive under-hood use |
Applications
| Portable Power Sequencing | Industrial Sensor Interface |
|---|---|
Use Scenario: Controlling enable signals for DC-DC converters in handheld devices where supply rails power up asynchronously. IC Role / Device Role / Timing Role: D-latch holds stable enable state during brown-out or reset events, decoupling sequencer timing from supply ramp rates. Use Value: Prevents erratic converter startup by freezing control logic until all rails stabilize - no external RC timing needed. | Use Scenario: Isolating sensor data acquisition timing from noisy PLC backplane clocks in factory automation. IC Role / Device Role / Timing Role: Captures analog-to-digital converter output at precise PLC scan edges using synchronized LE pulses. Use Value: Eliminates metastability risk during clock domain crossing between 24V field bus and 3.3V microcontroller logic. |
| 5V-to-3.3V Level Translation | Configurable Logic State Hold |
Use Scenario: Interfacing legacy 5V microcontrollers to modern 3.3V FPGAs without dedicated level translators. IC Role / Device Role / Timing Role: Acts as bidirectional voltage-tolerant latch: D accepts 5V input, Q drives 3.3V load, LE driven from either domain. Use Value: Reduces BOM count and PCB area versus discrete resistor-divider or MOSFET-based solutions. | Use Scenario: Preserving configuration bits (e.g., boot mode, calibration flags) during system sleep or firmware update cycles. IC Role / Device Role / Timing Role: Stores volatile settings with zero static current draw (1µA max ICC) and retains state through VCC dips ≥100ms. Use Value: Enables reliable low-power retention without backup battery or nonvolatile memory overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G74DCKR | Edge-triggered D flip-flop (not level-sensitive); tPD = 4.5ns at 3.3V; no 7V input tolerance | Requires clock edge instead of level-enable; unsuitable for transparent latch behavior | Select only if synchronous edge-clocked operation is required and input overvoltage is not present |
| NC7SZ74P5X | Single D flip-flop in SC70-5; tPD = 3.5ns at 5V; VI max = VCC + 0.5V (no 7V tolerance) | Lacks power-down input protection and wide-VI capability; lower drive strength (IOL = 4mA) | Prefer for speed-critical edge-triggered designs where supply rails are tightly regulated and isolated |
Compared with SN74LVC1G74DCKR and NC7SZ74P5X, the 74V1G77STR uniquely provides level-sensitive latching, 7V input tolerance, and power-down safety - making it irreplaceable in mixed-voltage, asynchronous, or fault-resilient latch applications.
Availability
74V1G77STR is available at Aetrix Electronics and suitable for portable power sequencing, industrial sensor interface, 5V-to-3.3V level translation, and configurable logic state hold requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for 74V1G77STR 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The 74V series targets high-speed, low-power, mixed-voltage logic applications - specifically engineered for portable, battery-operated, and ruggedized embedded systems needing robust signal integrity and supply flexibility.
FAQ
Can the 74V1G77STR operate with VCC = 2.0V while accepting 5V inputs?
Yes. The device supports VCC as low as 2.0V and tolerates input voltages from –0.5V to +7.0V regardless of supply level. This allows direct connection of 5V signals to D or LE pins even when powered from 2V, enabling true level-agnostic interfacing without external clamping.
What is the minimum LE pulse width required to reliably latch data?
The minimum LE HIGH pulse width is 3.0ns at VCC = 5.0V (–40°C to +125°C). At VCC = 3.3V, it is 4.0ns. These values ensure full internal node settling and avoid metastability; shorter pulses may result in incomplete or indeterminate latching.
Does the 74V1G77STR require external pull-up or pull-down resistors on unused inputs?
No. All inputs feature built-in protection diodes and high-impedance CMOS structure. With power applied, floating inputs are not recommended due to noise sensitivity, but no external resistors are required for functionality or ESD safety - internal design ensures stable biasing and transient immunity.
How does the 74V1G77STR behave when VCC is ramping or momentarily lost?
During VCC ramp-up or drop-out, inputs remain protected (power-down input protection), and outputs enter high-impedance state. The latch retains its last valid state as long as VCC stays above ~1.0V; below that, Q becomes undefined but will not damage connected circuitry or backfeed into other supplies.
74V1G77STR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74V
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 1:1
- Output Type:
- Standard
- Voltage - Supply:
- 2V ~ 5.5V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 4.8ns
- Current - Output High, Low:
- 8mA, 8mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
74V1G77STR FAQ
1.How can I place an order for 74V1G77STR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74V1G77STR 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 74V1G77STR reliable?
The price and inventory of 74V1G77STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74V1G77STR is usually 5 days.
3.What payment methods are accepted for 74V1G77STR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74V1G77STR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74V1G77STR?
74V1G77STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74V1G77STR 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 74V1G77STR?
For technical support, including 74V1G77STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74V1G77STR requirements.
6.How does Aetrix verify that 74V1G77STR is sourced from the original manufacturer or authorized distributors?
All 74V1G77STR 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 74V1G77STR meets industry standards.
7.What is the process for return or replacement of 74V1G77STR?
All 74V1G77STR units undergo pre-shipment inspection (PSI). If there is an issue with 74V1G77STR, 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 74V1G77STR part is unused and in its original packaging.
Return procedure for 74V1G77STR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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