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Home > Products > Integrated Circuits (ICs) > Logic > Multivibrators

Nexperia USA Inc. HEF4538BT-Q100J

Name: HEF4538BT-Q100J
Brand: Nexperia USA Inc.
SKU: HEF4538BT-Q100J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HEF4538BT-Q100J

Manufacturer:: Nexperia USA Inc.

Category:: Multivibrators

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: HEF4538BT-Q100J.pdf

Description:: IC MULTIVIBRATOR 40NS 16SO

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Product details

Overview

HEF4538BT-Q100 from Nexperia is a dual retriggerable-resettable monostable multivibrator in SO16 package, delivering precision timing pulses with ±0.2 % temperature stability and 10 μs to infinity pulse width range determined by external R_EXT/C_EXT. It features independent active-LOW reset (nCD), dual-edge trigger inputs (nA for falling edge, nB for rising edge), complementary outputs (nQ/nQ), and operates across 3 V–15 V supply for automotive signal conditioning and pulse shaping.

For engineers reviewing the HEF4538BT-Q100 datasheet, HEF4538BT-Q100 pinout, HEF4538BT-Q100 application, or HEF4538BT-Q100 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, Schmitt-trigger input tolerance for slow edges, LOCMOS-based pulse width accuracy, and dual-monostable independence for synchronized or staggered timing functions in safety-critical vehicle subsystems.

Technical Context

This IC implements two fully independent monostable circuits using LOCMOS linear design techniques, enabling precise R_EXT×C_EXT-determined output pulse widths (t_W) with minimal drift over -40 °C to +125 °C. Each section supports retriggering during an active pulse and immediate termination via dedicated active-LOW nCD.

Inputs incorporate Schmitt-trigger action for robust noise immunity and compatibility with slow-rising/falling signals; propagation delays range from 32 ns (15 V, low C_L) to 460 ns (5 V, high C_L); static current draw is as low as 55 μA at 5 V with one monostable active.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.0 V to 15.0 V - Enables direct interface with 5 V, 10 V, and 12 V automotive rails without level shifting.
Pulse Width Accuracy	±0.2 % over temperature - Ensures stable timing in engine control, ADAS sensor sync, and body electronics under thermal stress.
Output Pulse Range	10 μs to ∞ - Achieved via external R_EXT/C_EXT; supports both short glitch suppression and long-duration timing (e.g., 1.09 s with 100 kΩ/10 μF).
Propagation Delay (nA/nB → nQ)	32 ns to 460 ns - Scales with V_DD and load capacitance; enables sub-100 ns response at 15 V for real-time fault detection.
Input Threshold Hysteresis	Integrated Schmitt trigger - Accepts slow edges down to 0.08 μs/V at 15 V, eliminating need for external conditioning in noisy harness environments.
AEC-Q100 Grade	Grade 1 (−40 °C to +125 °C) - Qualified for powertrain, chassis, and advanced driver assistance systems per automotive reliability standards.
ESD Protection	HBM >2000 V, CDM >1000 V - Withstands assembly handling and in-vehicle electrostatic events without latch-up or parametric shift.

Pinout & Package

HEF4538BT-Q100 uses the SOT109-1 (SO16) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1, 15 (1CEXT, 2CEXT)	External capacitor connection	Internally tied to ground; provides reference node for timing capacitor in each monostable channel.
2, 14 (1REXT/CEXT, 2REXT/CEXT)	External resistor/capacitor connection	Primary timing node: t_W = R_EXT × C_EXT; sets pulse duration independently per channel.
3, 13 (1CD, 2CD)	Direct reset input (active LOW)	Asynchronous termination of ongoing pulse; overrides trigger state immediately upon assertion.
4, 12 (1B, 2B)	Rising-edge trigger input	Triggers monostable on HIGH-to-LOW transition; used for clock-synchronized or event-driven timing initiation.
5, 11 (1A, 2A)	Falling-edge trigger input	Triggers monostable on LOW-to-HIGH transition; supports edge-detection of analog comparator outputs or switch bounce.
6, 10 (1Q, 2Q)	Non-inverted output	Active-HIGH pulse output; drives logic loads, LEDs, or gate drivers directly with 4.2 mA sink capability at 15 V.
7, 9 (1Q, 2Q)	Inverted output	Complementary active-LOW pulse; enables differential signaling or dual-signal generation without external inverters.
8 (VSS)	Ground supply voltage	Reference return path for all internal circuitry; must be low-impedance to maintain timing accuracy and noise immunity.
16 (VDD)	Positive supply voltage	Power rail for LOCMOS core; supports wide-range operation and defines logic thresholds (VIH/VIL scale with VDD).

Key Features

Feature	Design Value
Dual independent monostables	Enables concurrent timing functions (e.g., window detection + timeout) without cross-talk or shared timing components.
Retriggerable & resettable operation	Allows pulse extension during active output (retrigger) or forced early termination (nCD), critical for adaptive fault response.
LOCMOS linear timing architecture	Delivers ±0.2 % pulse width stability over temperature-superior to standard CMOS monostables relying on RC exponential decay.
Schmitt-trigger inputs	Eliminates false triggering from EMI or slow-switching sensors (e.g., Hall effect or thermistor interfaces) without external hysteresis networks.
Automotive-grade qualification	AEC-Q100 Grade 1 compliance ensures reliability in under-hood and cabin modules subject to thermal cycling and vibration.

Applications

Engine Control Unit Timing

ADAS Sensor Pulse Conditioning

Use Scenario: Generating precise dwell time for fuel injector drivers based on crankshaft position sensor edges.

IC Role / Device Role / Timing Role: Dual monostable provides synchronized injection pulse width (via nA/nB) and independent diagnostic timeout (via nCD reset) per cylinder bank.

Use Value: ±0.2 % pulse width stability maintains stoichiometric air-fuel ratio across full engine operating range (-40 °C to +125 °C).

Use Scenario: Converting noisy radar sensor wake-up pulses into clean, jitter-free enable signals for RF front-end power management.

IC Role / Device Role / Timing Role: First monostable cleans input edge with Schmitt trigger; second shapes fixed-duration enable pulse using R_EXT/C_EXT.

Use Value: Eliminates need for microcontroller GPIO debouncing and software timing, reducing latency and MCU load in real-time sensing paths.

Body Control Module Glitch Suppression

Electric Power Steering Timeout Monitoring

Use Scenario: Debouncing mechanical door lock switch inputs exposed to vibration-induced contact bounce.

IC Role / Device Role / Timing Role: Falling-edge triggered monostable (nA) generates 20 ms clean pulse; rising-edge input (nB) allows manual override reset.

Use Value: Hardware-level filtering prevents false lock/unlock commands without firmware intervention or additional passive RC networks.

Use Scenario: Detecting loss of valid torque sensor communication and initiating safe torque reduction within <50 ms.

IC Role / Device Role / Timing Role: One monostable triggered by periodic CAN message edge; nCD reset asserted on valid reception; timeout on nQ triggers fail-safe.

Use Value: Meets ISO 26262 ASIL-B timing requirements with deterministic hardware response, independent of software scheduler jitter.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual monostable multivibrator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LV221A	Single-supply 2 V–5.5 V operation; no AEC-Q100 qualification; higher typical propagation delay (15 ns min at 5 V).	Limited to infotainment or non-safety-critical modules; lacks automotive temperature range and reset flexibility.	Select when cost-sensitive consumer-grade timing suffices and 3 V–15 V operation is unnecessary.
MC14538B	Same functional topology but unqualified for automotive; wider V_DD range (3 V–18 V); ±1 % pulse width variation over temperature.	Acceptable for industrial controls but not certified for automotive deployment per OEM requirements.	Choose only if AEC-Q100 compliance is not mandated and legacy design reuse is prioritized.

Compared with SN74LV221A and MC14538B, the HEF4538BT-Q100 uniquely combines AEC-Q100 Grade 1 qualification, ±0.2 % pulse width stability, and dual independent retrigger/reset capability-making it the sole option for ASIL-B timing-critical automotive subsystems requiring hardware-deterministic behavior.

Availability

HEF4538BT-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor interfaces, body control modules, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HEF4538BT-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 leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components optimized for automotive, industrial, and mobile applications.

The HEF4538B-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to replace legacy 4000-series monostables with enhanced precision, noise immunity, and AEC-Q100 compliance for next-generation vehicle electronics.

FAQ

What is the minimum external timing capacitor value supported?

The datasheet specifies C_EXT ≥ 2000 pF for guaranteed accuracy. Below this value, leakage currents dominate timing error; 2 nF is validated across -40 °C to +125 °C with ±0.2 % variation. Capacitors smaller than 2000 pF may cause pulse width deviation exceeding specification limits due to internal node leakage and stray capacitance effects.

Can unused inputs be left floating?

No. Unused inputs must be tied to V_DD, V_SS, or another driven input to prevent metastability, increased supply current, and unintended triggering. Floating nA/nB pins can couple noise and cause spurious output pulses; floating nCD may result in uncontrolled reset behavior during ESD events or board-level transients.

How does the retrigger function interact with an active output pulse?

Asserting nA or nB during an active output pulse extends t_W by one full R_EXT×C_EXT interval from the retrigger edge. This occurs regardless of remaining pulse time-enabling dynamic pulse lengthening for applications like variable-duty-cycle PWM generation or adaptive timeout extension in fault-handling sequences.

Is the 10 μs minimum pulse width achievable at all supply voltages?

Yes-the 10 μs minimum is specified across the full 3 V–15 V range. At 3 V, timing accuracy degrades slightly (±1.5 % vs. ±0.2 % at 10 V), but functional pulse generation remains valid. The lower limit is constrained by internal propagation delays and transition times, not supply-dependent timing constants.

HEF4538BT-Q100J Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 4000B

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:: 40 ns

Current - Output High, Low:: 3.4mA, 3.4mA

Voltage - Supply:: 3 V ~ 15 V

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

HEF4538BT-Q100J FAQ

1.How can I place an order for HEF4538BT-Q100J through Aetrix?

Please submit a Request for Quotation (RFQ) for HEF4538BT-Q100J 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 HEF4538BT-Q100J reliable?

The price and inventory of HEF4538BT-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4538BT-Q100J is usually 5 days.

3.What payment methods are accepted for HEF4538BT-Q100J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4538BT-Q100J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HEF4538BT-Q100J?

HEF4538BT-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HEF4538BT-Q100J 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 HEF4538BT-Q100J?

For technical support, including HEF4538BT-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4538BT-Q100J requirements.

6.How does Aetrix verify that HEF4538BT-Q100J is sourced from the original manufacturer or authorized distributors?

All HEF4538BT-Q100J 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 HEF4538BT-Q100J meets industry standards.

7.What is the process for return or replacement of HEF4538BT-Q100J?

All HEF4538BT-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with HEF4538BT-Q100J, 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 HEF4538BT-Q100J part is unused and in its original packaging.

Return procedure for HEF4538BT-Q100J:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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