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NXP Semiconductors HEF4538BP,652
- Part No.:
- HEF4538BP,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Multivibrators
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
HEF4538BP,652.pdf
- Description:
- IC MULTIVIBRATOR 40NS 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,946
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Product details
Overview
HEF4538BP,652 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 from 10 μs to infinity via external REXT and CEXT components, with ±0.2 % pulse width variation over temperature and ±1.5 % over supply voltage - used in timing control, pulse shaping, and debounce circuits for industrial control panels.
For engineers reviewing the HEF4538BP,652 datasheet, HEF4538BP,652 pinout, HEF4538BP,652 application, or HEF4538BP,652 equivalent, key selection considerations include dual independent monostable operation, Schmitt-triggered inputs tolerant of slow edges, active-low direct reset, LOCMOS precision timing, and SO16 packaging compatible with automated assembly.
Technical Context
The HEF4538BP,652 implements two identical monostable multivibrators using LOCMOS technology, each with dual-edge trigger capability (nA: HIGH-to-LOW, nB: LOW-to-HIGH), an overriding active-LOW direct reset (nCD), and complementary outputs (nQ/nQ). Pulse width tW = REXT × CEXT is linearly controlled by external passive components.
Each section features Schmitt-trigger inputs for noise immunity, operates statically across -40 °C to +125 °C, and supports 5 V/10 V/15 V parametric ratings. Unused inputs must be tied to VDD, VSS, or another input to prevent floating states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 15 V - enables interoperability across legacy 5 V, industrial 10 V, and high-voltage 15 V logic systems without level-shifting. |
| Pulse Width Range | 10 μs to ∞ - set by external REXT and CEXT; supports both short timing intervals and long-duration one-shots. |
| Pulse Width Accuracy | ±0.2 % over temperature - ensures stable timing in thermal environments like motor drives or power supplies. |
| Propagation Delay | 60 ns (typ) at 15 V - guarantees fast response for real-time edge detection and retriggering in digital control loops. |
| Input Thresholds | VIL ≤ 4.0 V, VIH ≥ 11.0 V at 15 V - wide hysteresis from Schmitt-trigger inputs rejects noise on slow-rising signals. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood, factory-floor, and power-conversion applications. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - robust handling during PCB assembly and field service. |
Pinout & Package
HEF4538BP,652 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width - suitable for surface-mount reflow and wave soldering in high-volume manufacturing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 (1CEXT, 2CEXT) | External capacitor ground node | Must be connected to VSS (ground); provides reference for timing capacitor CEXT. |
| 2, 14 (1REXT/CEXT, 2REXT/CEXT) | Timing resistor/capacitor node | Connects external REXT and CEXT to define pulse width tW = REXT × CEXT per channel. |
| 3, 13 (1CD, 2CD) | Direct reset input | Active-LOW signal terminates output pulse immediately - critical for emergency stop or fault recovery. |
| 4, 12 (1B, 2B) | Positive-edge trigger input | Triggers monostable on LOW-to-HIGH transition - used with clean clock or microcontroller GPIO. |
| 5, 11 (1A, 2A) | Negative-edge trigger input | Triggers monostable on HIGH-to-LOW transition - ideal for switch debouncing or analog comparator outputs. |
| 6, 10 (1Q, 2Q) | Non-inverted output | Active-HIGH output pulse with standardized drive strength (IOL = 4.2 mA at 15 V). |
| 7, 9 (1Q, 2Q) | Inverted output | Complementary active-LOW output - eliminates need for external inverters in dual-signal logic. |
| 8 (VSS) | Ground supply | Reference for all inputs, outputs, and timing components; must be low-impedance. |
| 16 (VDD) | Power supply | Accepts 3–15 V; powers both monostables and internal logic - decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Enables simultaneous timing functions (e.g., delay + timeout) without inter-channel crosstalk or shared timing components. |
| Retriggerable & resettable operation | Allows pulse extension via new triggers before timeout, and immediate termination via nCD - essential for adaptive timing in safety-critical systems. |
| Schmitt-trigger inputs | Provides >1 V hysteresis at 15 V, enabling reliable triggering from noisy mechanical switches, slow RC networks, or unconditioned sensor outputs. |
| LOCMOS precision timing | Guarantees ±0.2 % pulse width stability over -40 °C to +125 °C - superior to standard CMOS for industrial-grade accuracy. |
| Wide 3–15 V supply range | Eliminates need for dedicated voltage regulators when interfacing with mixed-supply systems (e.g., 5 V MCU + 12 V actuator drivers). |
Applications
| Industrial Timer Module | Microcontroller Debounce Interface |
|---|---|
|
Use Scenario: Generating fixed-duration enable pulses for solenoid valves in PLC-controlled assembly lines. IC Role / Device Role / Timing Role: Dual monostable provides independent on-delay and off-delay timing, synchronized to 24 V control signals. Use Value: Eliminates software timing overhead and ensures deterministic response even during MCU interrupt latency spikes. |
Use Scenario: Cleaning mechanical switch bounce in human-machine interface (HMI) pushbuttons. IC Role / Device Role / Timing Role: Each monostable conditions one switch input using nA negative-edge trigger and 20 ms pulse width. Use Value: Provides hardware-level debounce with guaranteed 20 ms minimum contact stabilization - no firmware polling or timer resources consumed. |
| Power Supply Sequencing Controller | Test Equipment Pulse Generator |
|
Use Scenario: Enforcing strict power-up order between FPGA core, I/O bank, and memory rails in telecom baseband boards. IC Role / Device Role / Timing Role: First monostable delays enable to I/O bank; second triggers after first times out to sequence memory rail. Use Value: Achieves sub-microsecond jitter-free sequencing without FPGA configuration dependencies or external clocks. |
Use Scenario: Producing calibrated test pulses for validating oscilloscope rise time measurements. IC Role / Device Role / Timing Role: Driven by function generator edge, generates repeatable 100 ns–10 ms pulses via precision REXT/CEXT selection. Use Value: Delivers traceable, temperature-stable pulse widths (±0.2 %) directly traceable to passive component tolerances - no calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4538BE | Same dual monostable architecture but TI-manufactured; wider propagation delay spread (±30 % vs ±15 % typ), no LOCMOS precision. | Limited to commercial temperature range (-55 °C to +125 °C), lacks ±0.2 % pulse width stability over temp. | Prefer HEF4538BP,652 for industrial temperature stability and tighter timing tolerance; CD4538BE acceptable for cost-sensitive non-critical timing. |
| 74HC4538D | High-speed CMOS variant; faster propagation (20 ns typ at 5 V) but narrower supply range (2–6 V) and no 15 V operation. | Not suitable for 12 V/15 V systems; lacks direct reset override and Schmitt-trigger input hysteresis. | Select HEF4538BP,652 when 3–15 V operation, reset control, or noise-immune triggering is required; 74HC4538D only for 5 V high-speed designs. |
Compared with CD4538BE and 74HC4538D, the HEF4538BP,652 uniquely combines extended supply voltage (3–15 V), ±0.2 % pulse width stability, active-LOW direct reset, and Schmitt-trigger inputs - making it the only option qualified for precision timing in harsh industrial environments.
Availability
HEF4538BP,652 is available at Aetrix Electronics and suitable for industrial timer modules, microcontroller debounce interfaces, power supply sequencing controllers, and test equipment pulse generators requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF4538BP,652 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 high-volume, high-reliability logic, analog, and discrete devices - with leadership in automotive-qualified and industrial-grade components.
The HEF4538BP,652 belongs to Nexperia's legacy HEF4000B logic family, designed specifically for precision timing applications demanding wide supply range, temperature stability, and robust noise immunity in industrial automation and power systems.
FAQ
What is the minimum pulse width achievable with HEF4538BP,652?
The HEF4538BP,652 supports a minimum pulse width of 10 μs, verified at 15 V supply with REXT = 10 kΩ and CEXT = 1 nF. This value is limited by internal propagation delays and is consistent across both monostables. For shorter durations, external logic or faster ICs are required - the HEF4538BP,652 is not specified below 10 μs.
Can HEF4538BP,652 operate reliably at 3.3 V supply?
Yes, HEF4538BP,652 is fully specified down to 3 V per its recommended operating conditions. At 3.3 V, VIH is ~2.3 V and VIL is ~1.0 V, providing adequate noise margin. Propagation delay increases to ~440 ns (max), and output drive reduces - but all static and dynamic parameters remain guaranteed per datasheet Table 5 and Table 8.
How does the direct reset (nCD) function interact with ongoing output pulses in HEF4538BP,652?
A LOW pulse on nCD immediately forces both nQ outputs LOW and nQ outputs HIGH, terminating any active output pulse regardless of remaining timing interval. The reset is asynchronous and overrides all trigger inputs. After nCD returns HIGH, the monostable remains in quiescent state until next valid trigger - no auto-retrigger occurs.
What external component tolerances are recommended for precision timing with HEF4538BP,652?
For ±0.5 % total pulse width accuracy, use 0.1 % metal-film resistors for REXT and X7R or C0G ceramic capacitors with ±1 % tolerance for CEXT. Leakage current of CEXT must be <1 nA to avoid drift; film or NP0/C0G types meet this. The HEF4538BP,652 itself contributes only ±0.2 % variation over temperature.
Is HEF4538BP,652 pin-compatible with older HEF4538P variants?
No - HEF4538BP,652 uses SO16 (SOT109-1) packaging, while legacy HEF4538P was in DIP-16 (SOT38-4). Pin functions are identical per datasheet Table 2, but physical layout, thermal characteristics, and reflow profiles differ. PCB redesign is required; no drop-in replacement exists between these packages.
HEF4538BP,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
HEF4538BP,652 FAQ
1.How can I place an order for HEF4538BP,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4538BP,652 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 HEF4538BP,652 reliable?
The price and inventory of HEF4538BP,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4538BP,652 is usually 5 days.
3.What payment methods are accepted for HEF4538BP,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4538BP,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4538BP,652?
HEF4538BP,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4538BP,652 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 HEF4538BP,652?
For technical support, including HEF4538BP,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4538BP,652 requirements.
6.How does Aetrix verify that HEF4538BP,652 is sourced from the original manufacturer or authorized distributors?
All HEF4538BP,652 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 HEF4538BP,652 meets industry standards.
7.What is the process for return or replacement of HEF4538BP,652?
All HEF4538BP,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF4538BP,652, 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 HEF4538BP,652 part is unused and in its original packaging.
Return procedure for HEF4538BP,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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