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Nexperia USA Inc. 74HC4538D-Q100,118
- Part No.:
- 74HC4538D-Q100,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC4538D-Q100,118.pdf
- Description:
- IC MULTIVIBRATOR 25NS 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,368
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Product details
Overview
74HC4538D-Q100 from Nexperia is a dual retriggerable-resettable precision monostable multivibrator in SO16 package, used for generating accurate, edge-triggered timing pulses in automotive control logic. It features two independent monostables, each with dual-edge trigger inputs (nA/nB), active-low direct reset (nCD), complementary outputs (nQ/nQ), and external REXT/CEXT timing network. Output pulse width = 0.7 × REXT × CEXT, with ±0.2% typical variation over temperature - deployed in engine control unit (ECU) watchdog timeout circuits.
For engineers reviewing the 74HC4538D-Q100 datasheet, 74HC4538D-Q100 pinout, 74HC4538D-Q100 application, or 74HC4538D-Q100 equivalent, key selection considerations include AEC-Q100 Grade 1 qualification (-40 °C to +125 °C), Schmitt-trigger input tolerance for slow edges, dual-edge triggering capability, precise external-timed pulse generation, and separate reset per channel for fault-recovery timing in safety-critical automotive subsystems.
Technical Context
This device implements two independent CMOS monostable multivibrators using linear design techniques to ensure precise output pulse width control via external REXT and CEXT components. Each channel supports both rising- and falling-edge triggering on dedicated inputs (nA for HIGH-to-LOW, nB for LOW-to-HIGH), with immediate termination of the output pulse upon assertion of the active-low nCD signal.
Schmitt-trigger action at all inputs provides high noise immunity and tolerance to slow input transitions; clamp diodes enable interface to voltages exceeding VCC when used with current-limiting resistors. The circuit operates across 2.0 V to 6.0 V supply and meets AEC-Q100 Grade 1 requirements for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports wide automotive battery voltage variation including cold-crank conditions. |
| Operating Temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood automotive use. |
| Pulse Width Accuracy | ±0.2 % typical over temperature - enables high-reliability timing in safety-critical ECU functions. |
| Propagation Delay | 24 ns to 80 ns (VCC = 4.5–6.0 V) - ensures fast response in real-time control loops. |
| Input Trigger Edge | Rising and falling edge on separate pins (nA, nB) - allows flexible synchronization with diverse signal sources. |
| Reset Response Time | 6 ns to 24 ns (VCC = 4.5–6.0 V) - guarantees rapid fault recovery in watchdog and safety monitor circuits. |
| Output Drive Strength | ±4.0 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to drive TTL loads or subsequent logic stages directly. |
Pinout & Package
74HC4538D-Q100 uses the SOT109-1 (SO16) plastic small outline package: 16-pin, 3.9 mm body width, standard gull-wing lead form compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 (1CEXT, 2CEXT) | External capacitor connection | Ground-referenced timing capacitor nodes; required for pulse width definition. |
| 2, 14 (1REXT/CEXT, 2REXT/CEXT) | External resistor/capacitor node | Connects REXT in series with CEXT to set pulse width: TW = 0.7 × REXT × CEXT. |
| 3, 13 (1CD, 2CD) | Direct reset input | Active-LOW asynchronous reset - terminates output pulse immediately regardless of trigger state. |
| 4, 12 (1B, 2B) | LOW-to-HIGH trigger input | Edge-sensitive input; triggers monostable on rising edge only. |
| 5, 11 (1A, 2A) | HIGH-to-LOW trigger input | Edge-sensitive input; triggers monostable on falling edge only. |
| 6, 10 (1Q, 2Q) | Non-inverted output | Active-HIGH output pulse synchronized to trigger event; complements nQ. |
| 7, 9 (1Q, 2Q) | Inverted output | Active-LOW complementary output; enables differential signaling or NAND-based logic interfacing. |
| 8 | Ground (GND) | 0 V reference plane for all internal circuitry and I/O. |
| 16 | Supply voltage (VCC) | Primary power rail; must be decoupled locally to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Enables parallel timing functions (e.g., dual-channel watchdog + pulse stretcher) without cross-talk or shared timing components. |
| Retriggerable & resettable operation | Allows dynamic pulse extension during ongoing output (retrigger) and forced early termination (reset) - critical for adaptive timing in fault-handling sequences. |
| Schmitt-trigger inputs | Guarantees clean edge detection on noisy or slow-rising signals (e.g., mechanical switch debouncing or sensor wake-up pulses). |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from -40 °C to +125 °C ambient - meets stringent reliability requirements for powertrain and chassis ECUs. |
| CMOS low-power design | ICC ≤ 160 μA max at VCC = 6.0 V - minimizes quiescent current draw in always-on automotive modules. |
Applications
| Engine Control Unit (ECU) Watchdog Timer | Transmission Control Module (TCM) Pulse Stretcher |
|---|---|
Use Scenario: Monitors microcontroller ALIVE signal; triggers system reset if pulse is missed or delayed beyond defined window. IC Role / Device Role / Timing Role: Precision monostable generates fixed-duration timeout pulse triggered by MCU heartbeat signal. Use Value: ±0.2% pulse width stability ensures deterministic fault detection timing across full automotive temperature range. |
Use Scenario: Extends short solenoid activation pulses from TCM logic to meet minimum valve actuation time requirements. IC Role / Device Role / Timing Role: Retriggerable monostable stretches incoming digital control pulses to ≥10 ms duration. Use Value: Dual-edge triggering allows compatibility with both open-drain and push-pull driver outputs in transmission hardware. |
| Body Control Module (BCM) Keyless Entry Debounce | Advanced Driver Assistance System (ADAS) Sensor Wake-Up Sequencer |
Use Scenario: Filters mechanical bounce from door handle switches before enabling RF transmitter activation. IC Role / Device Role / Timing Role: Schmitt-trigger inputs accept slow-switch transitions; monostable output provides clean, glitch-free enable signal. Use Value: Input hysteresis eliminates false triggers from contact chatter, improving user experience and reducing RF interference. |
Use Scenario: Generates precisely timed enable strobes to wake up radar or camera sensors after vehicle ignition. IC Role / Device Role / Timing Role: One-shot initiates sensor power-up sequence; second channel times analog settling before ADC sampling. Use Value: Separate reset inputs allow synchronized abort of wake-up sequence if collision warning interrupt occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC4538PW-Q100 | TSSOP16 package (SOT403-1); identical electrical specs and AEC-Q100 qualification. | Better thermal performance in high-density layouts; smaller footprint but requires finer-pitch assembly. | Select for space-constrained PCBs where thermal dissipation >8.5 mW/K above 91 °C is needed. |
| SN74LV4538AQPWRQ1 | Texas Instruments part; LV logic family (1.65–5.5 V), lower propagation delay (19 ns typ), same pinout. | Higher speed and lower VCC min enable use in 1.8 V domains; not drop-in compatible due to different input thresholds. | Choose when operating below 2.0 V or requiring sub-20 ns timing resolution in ADAS sensor interfaces. |
Compared with 74HC4538PW-Q100, the D-package offers higher thermal mass and easier hand-soldering; versus SN74LV4538AQPWRQ1, the 74HC4538D-Q100 delivers superior noise immunity and wider VCC margin at the cost of slightly longer propagation delays.
Availability
74HC4538D-Q100 is available at Aetrix Electronics and suitable for automotive ECU design, transmission control systems, and body electronics requiring stable component supply with AEC-Q100 compliance and long-term production continuity.
Supply support for 74HC4538D-Q100 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.
The 74HC4538-Q100 belongs to Nexperia's automotive-qualified HC logic family, designed specifically for robust, precision timing functions in harsh-environment electronic control units where reliability and temperature stability are non-negotiable.
FAQ
What is the minimum external timing resistor value supported?
The datasheet specifies REXT minimum as 2 kΩ at VCC = 5.0 V and 10 kΩ at VCC = 2.0 V. Using values below these limits risks unstable timing behavior and increased sensitivity to parasitic capacitance. For reliable operation across -40 °C to +125 °C, Nexperia recommends staying within the 10 kΩ to 1 MΩ range with standard 1% metal-film resistors.
Can both trigger inputs (nA and nB) be used simultaneously on one channel?
No - nA and nB serve distinct edge-detection roles: nA responds only to HIGH-to-LOW transitions, nB only to LOW-to-HIGH. Simultaneous assertion does not cause conflict but results in redundant triggering; the last valid edge determines the output pulse start. This architecture prevents race conditions while enabling flexible interface to either polarity of control signals.
How does the device behave during power-down with large CEXT values?
A large CEXT stores energy that can discharge through input protection diodes when VCC collapses, risking latch-up or damage. Nexperia recommends adding a germanium or Schottky damping diode (DEXT) between nREXT/CEXT and GND, as shown in Figure 10 of the datasheet, to safely bleed stored charge during system shutdown.
Is the 74HC4538D-Q100 pin-compatible with non-automotive 74HC4538 variants?
Yes - the SO16 pinout matches industry-standard 74HC4538 devices (e.g., NXP 74HC4538D, ON Semiconductor MC74HC4538AD). However, the Q100 version includes enhanced ESD protection (HBM >2000 V), tighter parametric screening, and extended temperature validation - making it safe for drop-in replacement only when automotive-grade reliability is required.
74HC4538D-Q100,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 25 ns
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HC4538D-Q100,118 FAQ
1.How can I place an order for 74HC4538D-Q100,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC4538D-Q100,118 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 74HC4538D-Q100,118 reliable?
The price and inventory of 74HC4538D-Q100,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC4538D-Q100,118 is usually 5 days.
3.What payment methods are accepted for 74HC4538D-Q100,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC4538D-Q100,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC4538D-Q100,118?
74HC4538D-Q100,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC4538D-Q100,118 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 74HC4538D-Q100,118?
For technical support, including 74HC4538D-Q100,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC4538D-Q100,118 requirements.
6.How does Aetrix verify that 74HC4538D-Q100,118 is sourced from the original manufacturer or authorized distributors?
All 74HC4538D-Q100,118 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 74HC4538D-Q100,118 meets industry standards.
7.What is the process for return or replacement of 74HC4538D-Q100,118?
All 74HC4538D-Q100,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC4538D-Q100,118, 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 74HC4538D-Q100,118 part is unused and in its original packaging.
Return procedure for 74HC4538D-Q100,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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