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Texas Instruments CD14538BE-NG
- Part No.:
- CD14538BE-NG
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD14538BE-NG.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:2,751
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Product details
Overview
CD14538BE-NG from Texas Instruments is a dual precision monostable multivibrator IC with independent trigger inputs, reset capability, and complementary Q/Q̅ outputs per section. It operates over -55°C to +125°C, supports 3V–18V supply, and features TTL/CMOS-compatible inputs. It is used in pulse shaping, timing control, and debouncing circuits in industrial instrumentation.
For engineers reviewing the CD14538BE-NG datasheet, CD14538BE-NG pinout, CD14538BE-NG application, or CD14538BE-NG equivalent, key selection criteria include its dual-monostable architecture, wide VDD range, temperature-rated PDIP package, and compatibility with legacy CD4098B/CD4538B designs.
Technical Context
The CD14538BE-NG implements two independent retriggerable monostable multivibrators, each with separate A/B trigger inputs, active-low reset (R), and complementary outputs (Q, Q̅). Timing is set externally via REXT and CEXT, supporting pulse widths from microseconds to seconds.
It uses standard CMOS silicon-gate technology, ensuring low power consumption (<100 µA typical IDD at 5V), high noise immunity, and rail-to-rail output swing. Input thresholds are referenced to VDD/2, enabling robust operation across the full supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual retriggerable monostable multivibrator with independent timing per channel |
| Supply Voltage Range | 3V to 18V - enables direct interface with 3.3V, 5V, and 12V logic systems without level shifting |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and harsh-environment industrial use |
| Package Type | 16-pin PDIP (N) - through-hole mounting compatible with legacy prototyping and high-reliability board assembly |
| Input Compatibility | TTL- and CMOS-level compatible - accepts standard logic families without external biasing |
| Output Drive | ±4.2 mA at 5V - sufficient to directly drive LEDs, small relays, or subsequent CMOS/TTL inputs |
| Propagation Delay | 100 ns typical at 5V - supports precise timing in sub-microsecond applications |
Pinout & Package
CD14538BE-NG is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 7.62 mm lead pitch, 19.3 mm body length, with standard DIP footprint and through-hole soldering profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Section 1 trigger inputs (A1, B1), reset (R1), output Q1 | A1/B1 are edge-triggered; R1 is active-low asynchronous reset for Section 1 |
| 5, 6, 7, 8 | Section 1 complementary output Q̅1, VSS, Section 2 trigger A2, B2 | Q̅1 mirrors Q1; VSS is ground reference for both sections |
| 9, 10, 11, 12 | Section 2 reset (R2), output Q2, Q̅2, VDD | R2 independently resets Section 2; VDD powers both sections |
| 13, 14, 15, 16 | Section 2 external timing components (C2, R2), Section 1 timing (C1, R1) | Each section uses dedicated REXT/CEXT pins - no shared timing network required |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable operation | Allows pulse extension during active output - essential for variable-duration timing windows |
| Independent timing networks | Enables asymmetric pulse widths per section without component interaction or crosstalk |
| Complementary outputs | Provides simultaneous true and inverted logic states - eliminates need for external inverters |
| Wide supply voltage range | Supports single-supply operation across multiple system voltage domains without regulation |
| High ESD tolerance | ≥2 kV HBM - reduces susceptibility to handling damage in manual assembly environments |
Applications
| Industrial Timer Module | Power Supply Sequencing |
|---|---|
Use Scenario: Generating fixed-delay turn-on pulses for motor starters in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Dual monostable provides isolated start-up delays for primary and auxiliary motor windings. Use Value: Eliminates need for discrete RC timers and comparators, reducing BOM count and improving thermal stability of timing intervals. | Use Scenario: Controlling staggered enable sequencing of multi-rail DC/DC converters in telecom rectifiers. IC Role / Device Role / Timing Role: Each section generates precise, non-overlapping enable pulses for 3.3V and 12V regulator ICs. Use Value: Prevents inrush current stacking by enforcing minimum inter-enable delay, verified across -40°C to +85°C operating range. |
| Instrumentation Signal Conditioning | Legacy System Upgrade |
Use Scenario: Debouncing mechanical switch inputs in handheld test equipment with battery-powered operation. IC Role / Device Role / Timing Role: Converts noisy switch closures into clean, jitter-free digital pulses using retriggerable monostable action. Use Value: Achieves >10 ms rejection of contact bounce while consuming <50 µA quiescent current at 3.3V supply. | Use Scenario: Replacing obsolete CD4538B in field-deployed avionics maintenance tools requiring long-term component availability. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement preserving existing PCB layout and firmware logic. Use Value: Maintains original timing behavior while adding extended temperature support (-55°C to +125°C) and RoHS compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4098BNE | Same pinout and function but rated only to -40°C to +85°C; no military-grade temp option | Limited to commercial/industrial ambient environments; not suitable for extended temperature deployments | Select when cost sensitivity outweighs extended temperature requirement and legacy design reuse is critical |
| MC14538BD | Identical electrical specs and pinout; manufactured by ON Semiconductor; same -55°C to +125°C rating | Direct second-source alternative with identical qualification and reliability data | Preferred for dual-sourcing strategies where TI and ON Semi supply chain diversification is required |
Compared with CD4098BNE and MC14538BD, the CD14538BE-NG offers guaranteed military-temperature operation and TI's long-term product continuity commitment, making it optimal for aerospace, defense, and infrastructure systems where lifecycle assurance is mandatory.
Availability
CD14538BE-NG is available at Aetrix Electronics and suitable for industrial timer modules, power supply sequencing circuits, instrumentation signal conditioning, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for CD14538BE-NG 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and aerospace markets.
The CD14538B series was designed to provide radiation-tolerant, temperature-extended timing solutions for mission-critical systems where legacy CMOS logic compatibility and long-term manufacturability are essential.
FAQ
What is the maximum operating supply voltage for CD14538BE-NG?
The CD14538BE-NG supports a maximum supply voltage of 18 V. This allows direct integration into 12 V and 15 V industrial control systems without external regulators. Operation above 18 V risks permanent damage to the internal CMOS structure, and the device is not characterized beyond this limit per the official TI datasheet SCHS093C.
Is CD14538BE-NG pin-compatible with CD4538B?
Yes, CD14538BE-NG is pin-compatible with CD4538B and functionally interchangeable. However, CD4538B is not recommended for new designs due to obsolescence status, while CD14538BE-NG maintains active production, RoHS compliance, and extended temperature qualification (-55°C to +125°C).
Does CD14538BE-NG support retriggerable monostable operation?
Yes, CD14538BE-NG supports retriggerable operation on both monostable sections. When a new trigger occurs during an active output pulse, the output pulse width is extended from that point - a key feature confirmed in the functional description and timing diagrams of the CD14538BE-NG datasheet.
What is the typical propagation delay of CD14538BE-NG at 5 V supply?
The typical propagation delay from trigger input to Q output for CD14538BE-NG is 100 ns at VDD = 5 V and TA = 25°C. This value is specified in the "Switching Characteristics" table of the TI datasheet SCHS093C and remains stable across the full operating temperature range.
Can CD14538BE-NG be used with a single external resistor and capacitor for both sections?
No - CD14538BE-NG requires separate external R and C components for each section (pins 15–16 for Section 1; pins 13–14 for Section 2). The datasheet explicitly defines independent timing networks; sharing components would cause coupling and unpredictable pulse width interaction between sections.
CD14538BE-NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 100 ns
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage - Supply:
- 3 V ~ 18 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD14538BE-NG FAQ
1.How can I place an order for CD14538BE-NG through Aetrix?
Please submit a Request for Quotation (RFQ) for CD14538BE-NG 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 CD14538BE-NG reliable?
The price and inventory of CD14538BE-NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD14538BE-NG is usually 5 days.
3.What payment methods are accepted for CD14538BE-NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD14538BE-NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD14538BE-NG?
CD14538BE-NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD14538BE-NG 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 CD14538BE-NG?
For technical support, including CD14538BE-NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD14538BE-NG requirements.
6.How does Aetrix verify that CD14538BE-NG is sourced from the original manufacturer or authorized distributors?
All CD14538BE-NG 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 CD14538BE-NG meets industry standards.
7.What is the process for return or replacement of CD14538BE-NG?
All CD14538BE-NG units undergo pre-shipment inspection (PSI). If there is an issue with CD14538BE-NG, 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 CD14538BE-NG part is unused and in its original packaging.
Return procedure for CD14538BE-NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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