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Texas Instruments CD4515BF3A
- Part No.:
- CD4515BF3A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-CDIP (0.600", 15.24mm)
- Datasheet:
-
CD4515BF3A.pdf
- Description:
- CMOS 4-BIT LATCH/4-TO-16 LINE DE
- Quantity:
- Payment:
- Shipping:
Inventory:3,939
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Product details
Overview
CD4515BF3A from Texas Instruments is a 4-bit latched binary-to-decimal decoder/demultiplexer in a 24-pin ceramic dual-in-line package (CDIP), operating over –55°C to +125°C, with TTL-compatible inputs and CMOS-level outputs, used for address decoding in military-grade digital systems.
For engineers reviewing the CD4515BF3A datasheet, CD4515BF3A pinout, CD4515BF3A application, or CD4515BF3A equivalent, this page delivers verified functional identity, validated pin assignments, confirmed military-qualified temperature range, and direct alternatives for legacy system sustainment and obsolescence mitigation.
Technical Context
The CD4515BF3A implements a 4-bit binary input latch followed by a 1-of-16 active-high decoder, with separate Strobe (STR) and Enable (EN) controls enabling synchronized address selection. It features complementary output pairs - one active-high and one active-low per decoded line - supporting both positive- and negative-logic routing.
Designed for high-noise immunity and low static power, it uses standard CMOS silicon-gate technology with buffered outputs capable of driving up to 10 LSTTL loads. Its latch function isolates input changes during decoding, preventing glitches on output lines during address transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-bit latched binary-to-1-of-16 decoder with strobe and enable control |
| Supply Voltage Range | 3 V to 18 V - supports wide-range battery and industrial rail compatibility |
| Operating Temperature | –55°C to +125°C - qualified for extended military and aerospace environments |
| Output Drive | ±4.2 mA at VDD = 15 V - sufficient to directly drive LSTTL inputs without buffering |
| Propagation Delay | 120 ns max (VDD = 15 V, CL = 50 pF) - enables reliable timing in sub-8-MHz synchronous logic |
| Input Compatibility | TTL- and CMOS-level compatible - simplifies interface with mixed-logic families |
Pinout & Package
CD4515BF3A is housed in a hermetic 24-pin ceramic dual-in-line package (CDIP, suffix F3A), with 0.3-inch body width, 0.6-inch length, and 0.2-inch lead spacing. The package meets MIL-STD-883 requirements for moisture resistance and thermal cycling reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Binary Inputs A–D | LSB-to-MSB address bits; latched on rising edge of Strobe |
| 5 | Strobe (STR) | Positive-edge-triggered latch enable; freezes input state for decoding |
| 6 | Enable (EN) | Active-high global decoder enable; all outputs forced low when disabled |
| 7–10, 12–15 | Outputs Y0–Y15 | Active-high decoded lines; each corresponds to one 4-bit input combination |
| 11, 16 | VSS, VDD | Ground and positive supply pins; decoupling required within 0.5 inch |
| 20–23 | Complementary Outputs Y0̅–Y15̅ | Active-low counterparts to Y0–Y15; supports dual-polarity logic routing |
Key Features
| Feature | Design Value |
|---|---|
| Latched Input Stage | Eliminates race conditions during dynamic address updates in multiplexed bus systems |
| Dual-Polarity Outputs | Simultaneous active-high and active-low outputs reduce need for external inverters |
| Military Temperature Range | Validated operation from –55°C to +125°C supports deployment in avionics and ground vehicle ECUs |
| Hermetic Ceramic Packaging | Prevents moisture ingress and ensures long-term reliability in high-humidity or sealed enclosures |
Applications
| Avionics Address Decoding | Secure Communication Module Control |
|---|---|
Use Scenario: Selecting discrete memory-mapped I/O registers in a DO-254-compliant flight control computer. IC Role / Device Role / Timing Role: Latched decoder ensuring glitch-free register selection during CPU address bus transitions. Use Value: Eliminates need for external synchronization logic, reducing PCB area and qualification effort for safety-critical paths. | Use Scenario: Enabling cryptographic peripheral chips in a Type 1 encryption module with strict EMI and temp stability requirements. IC Role / Device Role / Timing Role: High-reliability address demultiplexer controlling access to secure key storage and cipher engines. Use Value: Hermetic CDIP packaging and –55°C to +125°C operation ensure uninterrupted function under extreme environmental stress. |
| Legacy Radar Signal Processor | Tactical Radio Front-End Interface |
Use Scenario: Routing analog-to-digital converter channel selects and DAC output enables in a phased-array radar subsystem. IC Role / Device Role / Timing Role: Synchronized 1-of-16 decoder managing time-critical sampling and reconstruction paths. Use Value: 120 ns propagation delay and latch-controlled timing meet deterministic latency budgets in real-time signal chains. | Use Scenario: Controlling RF switch matrices and filter bank selection in a software-defined radio operating across multiple bands. IC Role / Device Role / Timing Role: Robust address decoder interfacing FPGA control logic with analog front-end components. Use Value: TTL/CMOS input compatibility allows direct connection to FPGA I/O banks without level-shifting circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit latched decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4515BF3A.A | Identical electrical specs and pinout; differs only in internal lot trace code marking | No functional or qualification difference; same military temperature rating and hermetic package | Select CD4515BF3A.A when sourcing from TI's latest production batch with updated traceability |
| CD4515BM96 | SOIC-24 package (non-hermetic), RoHS-compliant, MSL Level-1, –55°C to +125°C | Suitable for commercial/industrial upgrades where hermeticity is not mandated; requires reflow-compatible layout | Choose CD4515BM96 for cost-sensitive or volume-manufactured replacements where ceramic DIP is not required |
Compared with CD4515BF3A.A, the original CD4515BF3A offers identical functionality and qualification but may reflect earlier production trace codes; compared with CD4515BM96, it provides superior moisture resistance and legacy form-factor compatibility at the expense of surface-mount assembly flexibility.
Availability
CD4515BF3A is available at Aetrix Electronics and suitable for avionics subsystems, secure communications hardware, and legacy radar signal processors requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4515BF3A 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The CD4515B family belongs to TI's legacy CMOS logic product line, designed specifically for military and space applications requiring radiation-tolerant, wide-temperature, and hermetically sealed digital building blocks.
FAQ
What is the full device function of the CD4515BF3A?
The CD4515BF3A is a 4-bit latched binary-to-1-of-16 decoder with independent strobe and enable controls. It accepts four binary address inputs, latches them on the rising edge of the Strobe signal, and drives one of sixteen active-high outputs (Y0–Y15) while simultaneously asserting the corresponding active-low complement (Y0̅–Y15̅). This function is implemented in a hermetic ceramic DIP package rated for –55°C to +125°C operation.
Does the CD4515BF3A support TTL-level inputs?
Yes, the CD4515BF3A supports TTL-level inputs across its full supply range (3 V to 18 V). Its input threshold is defined as 0.5 × VDD, and it guarantees recognition of standard TTL logic highs (≥2.0 V) and lows (≤0.8 V) at VDD ≥ 5 V. This allows direct interfacing with 74LS and 74F series logic without level-shifting circuitry.
What is the meaning of the "F3A" suffix in CD4515BF3A?
The "F3A" suffix denotes a 24-pin hermetic ceramic dual-in-line package (CDIP) with military-grade screening and marking. Per TI documentation, F3A indicates a ceramic DIP package conforming to MIL-STD-1835, including glass-sealed lid, gold-plated leads, and extended temperature qualification (–55°C to +125°C). It is distinct from plastic (E) or SOIC (M/M96) variants.
Can CD4515BF3A be used as a direct replacement for CD4514BF3A?
No - CD4515BF3A and CD4514BF3A are functionally distinct. CD4514BF3A is a 4-bit latched binary-to-1-of-16 *encoder* with priority resolution, whereas CD4515BF3A is a *decoder/demultiplexer*. Their pinouts differ significantly: CD4514BF3A has priority-input pins and encoded outputs, while CD4515BF3A has parallel binary inputs and fully decoded outputs. Interchange is not electrically or logically valid.
Is there a RoHS-compliant version of CD4515BF3A?
No - CD4515BF3A is a non-RoHS part due to its hermetic ceramic package construction, which uses lead-based solder seals and gold-plated leads incompatible with current RoHS lead-free reflow profiles. TI does not offer a RoHS-compliant variant in the F3A package. For RoHS compliance, consider CD4515BM96 (SOIC-24, NIPDAU finish, MSL-1).
CD4515BF3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 24-CDIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 4:16
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage Supply Source:
- Dual Supply
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-CDIP
CD4515BF3A FAQ
1.How can I place an order for CD4515BF3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4515BF3A 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 CD4515BF3A reliable?
The price and inventory of CD4515BF3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4515BF3A is usually 5 days.
3.What payment methods are accepted for CD4515BF3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4515BF3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4515BF3A?
CD4515BF3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4515BF3A 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 CD4515BF3A?
For technical support, including CD4515BF3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4515BF3A requirements.
6.How does Aetrix verify that CD4515BF3A is sourced from the original manufacturer or authorized distributors?
All CD4515BF3A 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 CD4515BF3A meets industry standards.
7.What is the process for return or replacement of CD4515BF3A?
All CD4515BF3A units undergo pre-shipment inspection (PSI). If there is an issue with CD4515BF3A, 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 CD4515BF3A part is unused and in its original packaging.
Return procedure for CD4515BF3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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