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

NXP Semiconductors HEC4538BT,112

Name: HEC4538BT,112
Brand: NXP Semiconductors
SKU: HEC4538BT,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HEC4538BT,112

Manufacturer:: NXP Semiconductors

Category:: Multivibrators

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

Datasheet:: HEC4538BT,112.pdf

Description:: IC MULTIVIBRATOR 35NS 16SO

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Product details

Overview

HEC4538BT,112 from Nexperia is a dual retriggerable-resettable monostable multivibrator in SO16 package, operating from 3 V to 15 V supply, delivering precise output pulse widths (t_W = R_EXT × C_EXT) from 10 μs to infinity with ±0.2 % temperature stability and Schmitt-triggered inputs for noise immunity. It serves as a timing generator in digital control circuits requiring accurate one-shot pulses.

For engineers reviewing the HEC4538BT,112 datasheet, HEC4538BT,112 pinout, HEC4538BT,112 application, or HEC4538BT,112 equivalent, key selection considerations include its dual independent monostable architecture, active-low reset (nCD), dual-edge triggering (nA/nB), LOCMOS process accuracy, and SO16 thermal performance up to +125 °C ambient.

Technical Context

The HEC4538BT,112 implements two identical monostable multivibrators using LOCMOS technology, enabling precise linear timing control via external R_EXT/C_EXT networks. Each section features separate active-low direct reset (nCD), complementary outputs (nQ/nQ), and dual-input triggering (nA: negative-edge, nB: positive-edge).

Its static operation supports rail-to-rail input thresholds (V_IL/V_IH scaled to V_DD), while dynamic behavior includes propagation delays as low as 40 ns (15 V, CL = 50 pF) and recovery/retrigger times under 10 ns - all specified across -40 °C to +125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3 V to 15 V - Enables direct interface with 5 V, 10 V, and 15 V logic systems without level shifting.
Output Pulse Width Accuracy	±0.2 % over temperature - Ensures stable timing in industrial environments where thermal drift must be minimized.
Pulse Width Range	10 μs to ∞ - Achieved by selecting R_EXT (5 kΩ–∞) and C_EXT (2000 pF–no limit); supports both short delay and long timeout functions.
Propagation Delay (nA/nB → nQ)	60 ns max at 15 V (CL = 50 pF) - Guarantees fast response in high-speed digital sequencing applications.
Input Threshold Type	Schmitt-trigger on nA/nB - Tolerates slow-rising/falling signals (Δt/ΔV down to 0.08 μs/V at 15 V), reducing need for external signal conditioning.
Operating Temperature	-40 °C to +125 °C - Qualified for extended-temperature industrial and automotive-adjacent control modules.
ESD Protection	HBM >2000 V, CDM >1000 V - Provides robust handling during PCB assembly and field operation without additional protection circuitry.

Pinout & Package

HEC4538BT,112 uses the SOT109-1 (SO16) plastic small outline package, 16-pin, 3.9 mm body width, with standard JEDEC MS-012 footprint and 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
1, 15 (1CEXT, 2CEXT)	External capacitor ground node	Must be connected to VSS; provides reference for timing capacitor C_EXT in each monostable section.
2, 14 (1REXT/CEXT, 2REXT/CEXT)	Timing resistor/capacitor junction	Connects external R_EXT and C_EXT; determines t_W = R_EXT × C_EXT with linear precision.
3, 13 (1CD, 2CD)	Active-low direct reset	Asynchronous termination of ongoing output pulse; overrides trigger inputs immediately.
4, 12 (1B, 2B)	Positive-edge trigger input	Triggers monostable on rising edge; immune to noise due to Schmitt action.
5, 11 (1A, 2A)	Negative-edge trigger input	Triggers monostable on falling edge; complements nB for flexible edge detection.
6, 10 (1Q, 2Q)	True output	Active-HIGH pulse output; drives TTL/CMOS loads up to ±2.4 mA at 15 V.
7, 9 (1Q, 2Q)	Complementary output	Active-LOW inverted pulse; enables differential signaling or dual-signal logic paths.
8 (VSS)	Ground supply	Reference for all inputs, outputs, and timing components; must be low-impedance.
16 (VDD)	Power supply	Single-supply rail supporting 3–15 V operation; powers internal LOCMOS circuitry and outputs.

Key Features

Feature	Design Value
Dual independent monostables	Enables two synchronized or isolated timing functions on one die - reduces board space vs. discrete 555-based solutions.
Retriggerable & resettable operation	Allows pulse extension (retrigger) or forced termination (nCD) - critical for fault-clearing or adaptive timing in safety-critical logic.
LOCMOS linear timing design	Delivers ±0.2 % pulse width variation over temperature - superior to standard CMOS multivibrators lacking process-matched timing elements.
Wide V_DD range (3–15 V)	Eliminates need for voltage regulators in mixed-voltage systems; supports legacy 5 V, modern 10 V, and high-headroom 15 V designs.
Schmitt-trigger inputs	Accepts slow or noisy signals (e.g., mechanical switch bounce, sensor outputs) without external debouncing circuitry.

Applications

Industrial Motor Control	Automotive Body Electronics
Use Scenario: Generating fixed-duration enable pulses for stepper motor driver gate control during position correction sequences. IC Role / Device Role / Timing Role: Dual monostable provides independent timing for phase A/B drive pulses with simultaneous reset capability for emergency stop. Use Value: ±0.2 % pulse width stability ensures consistent torque per step across -40 °C to +125 °C ambient, eliminating calibration drift.	Use Scenario: Debouncing door lock/unlock switch inputs and generating timed actuator drive pulses in central body controllers. IC Role / Device Role / Timing Role: One section debounces mechanical switch edges (via Schmitt nA/nB), second generates 500 ms lock solenoid activation pulse. Use Value: Single SO16 IC replaces two discrete 555 timers plus RC networks, reducing BOM count and layout area by 60 %.
Test Equipment Signal Generation	Power Supply Sequencing
Use Scenario: Creating calibrated delay windows for digital pattern generators verifying setup/hold timing margins in ASIC validation. IC Role / Device Role / Timing Role: Precision monostable generates repeatable 100 ns–10 ms pulses with sub-ns jitter, referenced to system clock edge. Use Value: LOCMOS linearity ensures <1 % pulse width error across full V_DD range (5–15 V), enabling voltage-margin testing without recalibration.	Use Scenario: Controlling power-up sequence of multi-rail FPGA systems (1.2 V core, 3.3 V I/O, 12 V analog) with interlocked enable delays. IC Role / Device Role / Timing Role: Dual sections generate staggered EN signals with adjustable R_EXT/C_EXT values; nCD synchronizes resets during brown-out recovery. Use Value: Active-low reset allows hardware-level coordination of all rails during fault conditions - no firmware dependency required.

Industrial Motor Control

Automotive Body Electronics

Use Scenario: Generating fixed-duration enable pulses for stepper motor driver gate control during position correction sequences.

IC Role / Device Role / Timing Role: Dual monostable provides independent timing for phase A/B drive pulses with simultaneous reset capability for emergency stop.

Use Value: ±0.2 % pulse width stability ensures consistent torque per step across -40 °C to +125 °C ambient, eliminating calibration drift.

Use Scenario: Debouncing door lock/unlock switch inputs and generating timed actuator drive pulses in central body controllers.

IC Role / Device Role / Timing Role: One section debounces mechanical switch edges (via Schmitt nA/nB), second generates 500 ms lock solenoid activation pulse.

Use Value: Single SO16 IC replaces two discrete 555 timers plus RC networks, reducing BOM count and layout area by 60 %.

Test Equipment Signal Generation

Power Supply Sequencing

Use Scenario: Creating calibrated delay windows for digital pattern generators verifying setup/hold timing margins in ASIC validation.

IC Role / Device Role / Timing Role: Precision monostable generates repeatable 100 ns–10 ms pulses with sub-ns jitter, referenced to system clock edge.

Use Value: LOCMOS linearity ensures <1 % pulse width error across full V_DD range (5–15 V), enabling voltage-margin testing without recalibration.

Use Scenario: Controlling power-up sequence of multi-rail FPGA systems (1.2 V core, 3.3 V I/O, 12 V analog) with interlocked enable delays.

IC Role / Device Role / Timing Role: Dual sections generate staggered EN signals with adjustable R_EXT/C_EXT values; nCD synchronizes resets during brown-out recovery.

Use Value: Active-low reset allows hardware-level coordination of all rails during fault conditions - no firmware dependency required.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS221N	TTL logic family; fixed 5 V only; no Schmitt inputs; higher power consumption (16 mW typical); no retriggerable mode.	Limited to 5 V systems; requires external RC network for timing; unsuitable for slow/noisy inputs or wide-temp operation.	Select only for legacy 5 V TTL designs where LOCMOS advantages are unnecessary.
CD4098BE	CMOS family; 3–18 V range; non-retriggerable; single monostable per package; no dedicated reset pin.	Requires two packages for dual timing; lacks nCD for pulse termination; timing accuracy degrades above 85 °C.	Use when cost is primary constraint and retrigger/reset functionality is not required.

Compared with SN74LS221N and CD4098BE, the HEC4538BT,112 delivers superior temperature stability (±0.2 % vs. ±5 %), dual retriggerable operation in one SO16 package, and guaranteed Schmitt-trigger noise immunity - making it optimal for new industrial and automotive-adjacent designs requiring precision and flexibility.

Availability

HEC4538BT,112 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, test equipment signal generation, and power supply sequencing requiring stable component supply across extended temperature ranges.

Supply support for HEC4538BT,112 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for industrial, automotive, and consumer applications.

The HEF4538B product line delivers precision timing ICs based on LOCMOS technology, designed specifically for applications demanding stable, retriggerable monostable behavior across wide voltage and temperature ranges.

FAQ

What is the maximum recommended external timing resistor value for HEC4538BT,112?

The maximum permissible R_EXT depends on C_EXT leakage and device input leakage but is typically limited to ~10 MΩ for maintaining ±0.2 % pulse width accuracy. At 15 V supply and 125 °C, input leakage reaches ±1.0 μA (Table 9), so R_EXT should be kept ≤1 MΩ when using high-leakage capacitors like electrolytics. For precision timing, use film or ceramic C_EXT with R_EXT ≤100 kΩ.

Can HEC4538BT,112 operate reliably at 3.3 V supply?

Yes - HEC4538BT,112 is fully specified from 3 V to 15 V. At 3.3 V, V_IH = 2.3 V min and V_IL = 1.0 V max (Table 6), ensuring compatibility with 3.3 V logic families. Propagation delay increases to ~440 ns (Table 8), and output drive strength reduces to ±0.36 mA (I_OL/I_OH), which remains sufficient for CMOS loads.

How does the nCD pin function during an active output pulse?

The nCD pin is an asynchronous active-low direct reset: asserting nCD LOW immediately forces both nQ outputs LOW and nQ outputs HIGH, terminating the current pulse regardless of trigger state or timing capacitor voltage. The monostable remains in reset until nCD returns HIGH, after which it accepts new triggers - no minimum nCD pulse width is required beyond 10 ns (Table 8).

Is HEC4538BT,112 pin-compatible with older HEF4538B variants?

Yes - HEC4538BT,112 shares identical pinout, electrical characteristics, and functional behavior with all HEF4538B variants in SO16 (SOT109-1) package, including HEF4538BT. The 'C' prefix denotes Nexperia's updated manufacturing and qualification, with no changes to pin assignment, timing, or logic function.

What is the minimum C_EXT value supported by HEC4538BT,112?

The datasheet specifies C_EXT ≥ 2000 pF for stable operation. Below this, timing accuracy degrades due to input capacitance (C_I = 7.5 pF) and leakage effects. At 2000 pF and 100 kΩ R_EXT, t_W = 200 μs - verified in Table 8 (213–235 μs at 10 V). For shorter pulses, use the 10 μs minimum spec with appropriate R_EXT/C_EXT scaling.

HEC4538BT,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 4000B

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

Packaging:: Tube

Product Status:: Active

Logic Type:: Monostable

Independent Circuits:: 2

Schmitt Trigger Input:: Yes

Propagation Delay:: 35 ns

Current - Output High, Low:: -

Voltage - Supply:: 4.5 V ~ 15.5 V

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

HEC4538BT,112 FAQ

1.How can I place an order for HEC4538BT,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for HEC4538BT,112 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 HEC4538BT,112 reliable?

The price and inventory of HEC4538BT,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEC4538BT,112 is usually 5 days.

3.What payment methods are accepted for HEC4538BT,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEC4538BT,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HEC4538BT,112?

HEC4538BT,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HEC4538BT,112 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 HEC4538BT,112?

For technical support, including HEC4538BT,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEC4538BT,112 requirements.

6.How does Aetrix verify that HEC4538BT,112 is sourced from the original manufacturer or authorized distributors?

All HEC4538BT,112 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 HEC4538BT,112 meets industry standards.

7.What is the process for return or replacement of HEC4538BT,112?

All HEC4538BT,112 units undergo pre-shipment inspection (PSI). If there is an issue with HEC4538BT,112, 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 HEC4538BT,112 part is unused and in its original packaging.

Return procedure for HEC4538BT,112:

1.Submit a request within 90 days.

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

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