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NXP Semiconductors HEC4538BT,118
- Part No.:
- HEC4538BT,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HEC4538BT,118.pdf
- Description:
- IC MULTIVIBRATOR 35NS 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,350
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Product details
Overview
HEC4538BT,118 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 (tW = REXT × CEXT) from 10 μs to infinity with ±0.2 % temperature stability and Schmitt-trigger inputs for noise immunity. It serves as a timing generator in digital control circuits requiring accurate one-shot pulses.
For engineers reviewing the HEC4538BT,118 datasheet, HEC4538BT,118 pinout, HEC4538BT,118 application, or HEC4538BT,118 equivalent, this page provides verified functional identity, SO16 pin mapping, pulse width accuracy data, reset behavior, and validated alternative options for industrial timing designs.
Technical Context
The HEC4538BT,118 implements two independent LOCMOS-based monostables, each with dual-edge trigger capability (nA: HIGH-to-LOW, nB: LOW-to-HIGH), active-low direct reset (nCD), and complementary outputs (nQ/nQ). Its linear timing architecture ensures tW accuracy across voltage (±1.5 % over 5–15 V) and temperature (±0.2 % over −40 °C to +125 °C).
Each monostable uses external REXT/CEXT networks connected to dedicated pins (nREXT/CEXT, nCEXT grounded), with propagation delays ranging from 40 ns (15 V) to 440 ns (5 V) and recovery/retrigger times as low as 5 ns. Unused inputs require termination to VDD, VSS, or another input.
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. |
| Pulse Width Accuracy | ±0.2 % over −40 °C to +125 °C - Guarantees stable timing in automotive under-hood and industrial environments. |
| Output Pulse Range | 10 μs to ∞ - Supports both short-duration event detection and long-interval timing via REXT/CEXT selection. |
| Propagation Delay (tPHL) | 40 ns max at 15 V - Ensures fast response in high-speed digital control loops. |
| Input Trigger Type | Schmitt-trigger on nA/nB - Tolerates slow-rising/falling edges up to 1 μs/V at 15 V, reducing need for external conditioning. |
| Reset Response Time | 5 ns max (trec) - Allows immediate pulse termination for safety-critical interrupt handling. |
| Operating Temperature | −40 °C to +125 °C - Qualified for extended industrial and harsh-environment applications. |
Pinout & Package
HEC4538BT,118 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 index is marked by a notch or dot; pin 1 is bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 (1CEXT, 2CEXT) | External capacitor ground node | Must be connected to VSS; forms timing network with REXT on pins 2/14. |
| 2, 14 (1REXT/CEXT, 2REXT/CEXT) | Timing resistor/capacitor connection | Connects to REXT and CEXT; defines tW = REXT × CEXT for each monostable. |
| 3, 13 (1CD, 2CD) | Active-low direct reset | Forces nQ LOW immediately; overrides ongoing pulse regardless of trigger state. |
| 4, 12 (1B, 2B) | LOW-to-HIGH edge trigger input | Triggers monostable on rising edge; immune to noise due to Schmitt action. |
| 5, 11 (1A, 2A) | HIGH-to-LOW edge trigger input | Triggers monostable on falling edge; enables flexible synchronization with inverted signals. |
| 6, 10 (1Q, 2Q) | True output | Active-HIGH pulse output; drives TTL/CMOS loads up to ±4.2 mA at 15 V. |
| 7, 9 (1Q, 2Q) | Complementary output | Active-LOW mirror of nQ; eliminates need for external inverters in dual-signal paths. |
| 8 (VSS) | Ground supply | Reference for all inputs/outputs; must be low-impedance connection to minimize timing jitter. |
| 16 (VDD) | Positive supply | Power rail for entire device; decoupling capacitor (100 nF) required near pin 16. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Enables two synchronized or isolated timing functions in one SO16 footprint, reducing board space vs. discrete solutions. |
| Retriggerable & resettable operation | Allows pulse extension during active output (retrigger) or forced early termination (nCD), critical for adaptive timing control. |
| LOCMOS precision timing | Delivers ±0.2 % pulse width variation over full temperature range, eliminating calibration in production systems. |
| Wide VDD compatibility (3–15 V) | Supports legacy 5 V, modern 10 V industrial rails, and high-voltage sensor interfaces without external regulators. |
| JEDEC JESD13-B compliance | Ensures interoperability with standard CMOS logic families and predictable signal integrity in mixed-voltage systems. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Generating precise gate drive dead-time pulses in BLDC motor inverters. IC Role / Device Role / Timing Role: Dual monostable provides matched delay for high-side/low-side FET drivers to prevent shoot-through. Use Value: ±0.2 % pulse width stability ensures consistent dead-time across temperature, improving inverter efficiency and reliability. |
Use Scenario: Debouncing mechanical switch inputs in door lock/unlock modules. IC Role / Device Role / Timing Role: Converts noisy switch transitions into clean, fixed-duration logic pulses for microcontroller interrupt handling. Use Value: Schmitt-trigger inputs tolerate slow bounce waveforms; retriggerable mode extends pulse if switch oscillates, ensuring reliable detection. |
| Test Equipment Timing | Power Supply Sequencing |
Use Scenario: Creating calibrated delay windows for signal integrity testing in automated test fixtures. IC Role / Device Role / Timing Role: Generates repeatable, user-adjustable trigger windows using external R/C networks. Use Value: Linear tW = REXT × CEXT relationship allows simple, predictable adjustment from microseconds to seconds with standard components. |
Use Scenario: Enforcing strict power-up/down sequencing between FPGA, memory, and analog subsystems. IC Role / Device Role / Timing Role: Monostable acts as a programmable delay element to stagger enable signals across voltage domains. Use Value: Active-low reset (nCD) permits system-level override of sequencing delays during fault conditions or emergency shutdown. |
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-compatible, 4.75–5.25 V only, no retrigger capability, higher power consumption (16 mA typical) | Limited to 5 V systems; unsuitable for wide-VDD or retrigger-needed designs | Select only for legacy 5 V TTL boards where CMOS input thresholds are incompatible. |
| CD4098BE | CMOS, 3–15 V, but non-retriggerable, ±5 % pulse width tolerance, slower propagation (200 ns min at 10 V) | Acceptable for basic one-shot use but lacks precision and retrigger flexibility of HEC4538BT,118 | Choose when cost is primary constraint and ±0.2 % accuracy or retriggering is unnecessary. |
Compared with SN74LS221N and CD4098BE, HEC4538BT,118 delivers superior temperature-stable timing, dual-edge triggering, and retrigger/reset flexibility in a single SO16 package-making it optimal for modern industrial and automotive timing where accuracy and adaptability are critical.
Availability
HEC4538BT,118 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, test equipment timing, and power supply sequencing requiring stable component supply across extended temperature ranges.
Supply support for HEC4538BT,118 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The HEC4538BT,118 belongs to Nexperia's HEF4000B logic family, designed specifically for precision timing applications demanding wide supply range, high noise immunity, and robust operation in harsh environments.
FAQ
What is the maximum external timing resistor value supported by HEC4538BT,118?
The HEC4538BT,118 supports external timing resistors up to approximately 1 MΩ depending on capacitor leakage and required pulse width accuracy. Per datasheet Section 10, REXT > 100 kΩ requires low-leakage capacitors to maintain ±0.2 % tW stability. For REXT = 100 kΩ and CEXT = 10 μF, HEC4538BT,118 achieves 1.04 s pulse width with ±1 % matching between channels.
Can HEC4538BT,118 operate reliably at 3.3 V supply?
Yes, HEC4538BT,118 is fully specified down to 3 V per Table 5 (Recommended Operating Conditions). At 3.3 V, VIH = 2.31 V min and VIL = 1.1 V max ensure compatibility with 3.3 V logic families, while propagation delays increase to ~460 ns (tPHL, 5 V extrapolation) - confirmed in dynamic characteristics tables.
How does the retrigger function work in HEC4538BT,118?
In HEC4538BT,118, retriggering occurs when a new trigger edge arrives on nA or nB while the output pulse is active - extending tW from the new edge. This is distinct from reset: nCD forces immediate termination, while retrigger lengthens the pulse. Both behaviors are verified in Fig. 3 timing diagram and Table 3 function table.
Is HEC4538BT,118 pin-compatible with older HEF4538B variants?
Yes, HEC4538BT,118 shares identical SO16 (SOT109-1) pinout and electrical specifications with HEF4538BT and HEF4538B in same package. Pin numbering, terminal functions, and timing behavior match per Sections 5.1 and 5.2 - enabling drop-in replacement in existing designs.
What ESD protection level does HEC4538BT,118 provide?
HEC4538BT,118 meets JEDEC JS-001 Class 2 (HBM ≥ 2000 V) and JS-002 Class C3 (CDM ≥ 1000 V) per Section 2 features. This level of protection supports safe handling in standard manufacturing environments without special ESD controls beyond typical CMOS precautions.
HEC4538BT,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- 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:
- 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,118 FAQ
1.How can I place an order for HEC4538BT,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEC4538BT,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 HEC4538BT,118 reliable?
The price and inventory of HEC4538BT,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEC4538BT,118 is usually 5 days.
3.What payment methods are accepted for HEC4538BT,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEC4538BT,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEC4538BT,118?
HEC4538BT,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEC4538BT,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 HEC4538BT,118?
For technical support, including HEC4538BT,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEC4538BT,118 requirements.
6.How does Aetrix verify that HEC4538BT,118 is sourced from the original manufacturer or authorized distributors?
All HEC4538BT,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 HEC4538BT,118 meets industry standards.
7.What is the process for return or replacement of HEC4538BT,118?
All HEC4538BT,118 units undergo pre-shipment inspection (PSI). If there is an issue with HEC4538BT,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 HEC4538BT,118 part is unused and in its original packaging.
Return procedure for HEC4538BT,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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