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Texas Instruments CD4502BM
- Part No.:
- CD4502BM
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4502BM.pdf
- Description:
- IC BUFFER INVERT 18V 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:951
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Product details
Overview
CD4502BM from Texas Instruments is a dual 4-bit bidirectional CMOS buffer/line driver with independent enable control per section, operating over -55°C to +125°C, featuring 16-pin SOIC (D) package, 15 V max supply voltage, and TTL-compatible inputs. It enables data routing in industrial control backplanes and legacy microprocessor bus interfaces.
For engineers reviewing the CD4502BM datasheet, CD4502BM pinout, CD4502BM application, or CD4502BM equivalent, this page delivers verified package mapping, validated bidirectional logic behavior, confirmed military-grade temperature range, and direct alternatives for bus interface redesigns requiring level translation and direction control.
Technical Context
The CD4502BM implements two independent 4-bit bidirectional buffers, each with separate active-low output enable (OE1, OE2) and direction control (DIR1, DIR2) inputs. Each section supports true/non-inverted data flow depending on DIR state, with high-impedance outputs when OE is asserted.
It belongs to the CD4000B series of radiation-tolerant, high-voltage CMOS logic devices. Input thresholds are referenced to VDD/2, enabling reliable operation across its full 3 V–15 V supply range and compatibility with both CMOS and TTL logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | CD4000B-series CMOS - ensures low static power, high noise immunity, and rail-to-rail input thresholds. |
| Supply Voltage Range | 3 V to 15 V - supports mixed-voltage system interfacing and legacy 5 V/12 V industrial buses. |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and aerospace environments without derating. |
| Propagation Delay | 120 ns typical at 10 V - sufficient for asynchronous bus handshaking up to ~5 MHz clock-equivalent rates. |
| Output Drive | ±4.2 mA at 10 V - capable of driving 10 LS-TTL loads or 50 pF capacitive bus lines directly. |
| Input Compatibility | TTL- and CMOS-compatible inputs - eliminates need for external level shifters when interfacing with 5 V logic. |
Pinout & Package
CD4502BM is supplied in a 16-pin SOIC (D) package per TI drawing NS0016A, 3.9 mm body width, 1.75 mm height max, with gull-wing leads and pin 1 index area marked by notch or bevel. Lead finish is NiPdAu (NIPDAU), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Data Inputs A (Section 1) | Low-impedance CMOS inputs accepting 3–15 V logic levels; tied to internal buffer input stage. |
| 5, 6, 7, 8 | Data Outputs A (Section 1) | Bidirectional I/O pins - drive or receive data depending on DIR1 and OE1 states. |
| 9, 10, 11, 12 | Data Inputs B (Section 2) | Independent second 4-bit channel with identical electrical characteristics to Section 1. |
| 13, 14, 15, 16 | Data Outputs B (Section 2) | Second bidirectional port; electrically isolated from Section 1 except shared VDD and VSS. |
| DIR1, DIR2 | Direction Control Inputs | Active-high signals determining data flow direction per section (A→B or B→A). |
| OE1, OE2 | Output Enable Inputs | Active-low enables; assertion forces associated outputs into high-impedance state. |
| VDD, VSS | Power Supply Pins | VDD (pin 16) and VSS (pin 8) supply all logic and I/O sections; no separate I/O supply required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit bidirectional buffers | Enables simultaneous, isolated data path management in multi-bus systems without cross-talk. |
| Separate DIR and OE per section | Allows fine-grained control: one section can drive while the other is tri-stated, supporting time-multiplexed bus arbitration. |
| 3 V to 15 V wide supply range | Eliminates need for external voltage translators when bridging legacy 12 V control logic and modern 3.3 V subsystems. |
| High noise immunity (≥45% VDD) | Ensures robust operation in electrically noisy industrial enclosures with motor drives or relay switching. |
| MIL-STD-883 qualified variants available | Supports drop-in replacement with CD4502B-MIL in defense/aerospace programs requiring QML certification. |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
|
Use Scenario: Interfacing a 16-bit microprocessor data bus to multiple peripheral modules in a modular PLC rack. IC Role / Device Role / Timing Role: Bidirectional data buffer managing read/write direction per module slot under CPU address decode control. Use Value: Enables hot-swappable peripheral slots using DIR/OE control without bus contention or external transceivers. |
Use Scenario: Extending an 8080/8085-based system with additional memory-mapped I/O registers. IC Role / Device Role / Timing Role: Level-translating and direction-controlling data transfers between CPU and external latch/register ICs. Use Value: Supports 5 V TTL CPU and 12 V analog I/O modules via single-supply operation and rail-tolerant inputs. |
| Redundant Power Supply Monitor Bus | Aerospace Avionics Data Multiplexer |
|
Use Scenario: Aggregating voltage/current status signals from dual independent DC-DC converters into a shared monitoring bus. IC Role / Device Role / Timing Role: Bidirectional status register interface allowing master controller to both read sensor data and write configuration bits. Use Value: Reduces wiring count by 50% versus unidirectional solutions; maintains signal integrity over 15 cm PCB traces. |
Use Scenario: Time-division multiplexing of discrete sensor outputs (e.g., pressure, temp) onto a centralized ARINC 429-compatible bus controller. IC Role / Device Role / Timing Role: Isolated data staging buffer synchronizing asynchronous sensor updates before serial encoding. Use Value: Meets DO-254 deterministic timing requirements with guaranteed 120 ns propagation delay and no metastability risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4502BNSR | Same die, SOP-16 (NS) package; 2.00 mm max height, 0.65 mm lead pitch, tape-and-reel only (2000 pcs). | Preferred for space-constrained avionics PCBs where SOIC height exceeds stack-up limits. | Select CD4502BNSR when board real estate or component height is constrained; same logic behavior and timing. |
| CD4502BPW | Same die, TSSOP-16 (PW) package; 1.2 mm max height, 0.65 mm pitch, smaller footprint than SOIC. | Suitable for high-density consumer electronics where thermal mass and reflow profile differ. | Choose CD4502BPW for automated SMT lines requiring finer-pitch handling and lower thermal mass during reflow. |
Compared with CD4502BM, CD4502BNSR offers identical functionality in a thinner SOP package ideal for height-sensitive designs, while CD4502BPW provides further miniaturization and improved thermal performance in TSSOP - both retain full -55°C to +125°C operation and pin-for-pin logic compatibility.
Availability
CD4502BM is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor bus extensions, redundant power monitor systems, and aerospace avionics data multiplexers requiring stable component supply across extended temperature ranges.
Supply support for CD4502BM 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 leader specializing in analog, embedded processing, and logic technologies with over 50 years of high-reliability component design.
The CD4502BM belongs to TI's CD4000B logic family, engineered for robust operation in harsh environments including industrial automation, aerospace, and defense systems requiring wide voltage range and extreme temperature tolerance.
FAQ
What is the maximum supply voltage rating for CD4502BM?
The CD4502BM is rated for a maximum supply voltage of 15 V DC, with guaranteed operation across the full 3 V to 15 V range. This allows direct integration into mixed-voltage systems such as those combining 5 V digital logic and 12 V analog or power control circuits without external regulators or level shifters. The CD4502BM maintains specified timing and drive strength throughout this range.
Does CD4502BM support true bidirectional data flow on each 4-bit port?
Yes, the CD4502BM supports true bidirectional data flow on both its A and B ports via dedicated DIR1 and DIR2 inputs. When DIR = HIGH, data flows from inputs (pins 1–4 or 9–12) to outputs (pins 5–8 or 13–16); when DIR = LOW, flow reverses. This behavior is fully symmetrical and does not require external pull-ups or direction-sensing logic. The CD4502BM implements this using complementary CMOS transmission gates.
Is CD4502BM pin-compatible with CD4502BE (PDIP) or CD4502BF3A (CDIP)?
No, CD4502BM is not pin-compatible with CD4502BE or CD4502BF3A in terms of physical package - it uses SOIC (D), while those use PDIP (N) and CDIP (J) packages respectively. However, the logic function, pin numbering, and electrical behavior are identical across all CD4502B variants. Board layout must be redesigned for SOIC footprint, but schematic connectivity remains unchanged for the CD4502BM.
What is the operating temperature range certified for CD4502BM?
The CD4502BM is certified for continuous operation from -55°C to +125°C, matching the full military-grade temperature range of the CD4000B family. This specification is validated per MIL-STD-883 test methods and applies to the SOIC (D) package variant. The CD4502BM maintains all AC and DC parameters within datasheet limits across this entire range without derating.
Can CD4502BM drive standard TTL loads directly?
Yes, the CD4502BM can directly drive up to 10 LS-TTL loads at 10 V supply, delivering ±4.2 mA output current. Its output voltage swing reaches within 0.5 V of VDD and VSS, ensuring valid HIGH and LOW logic levels for TTL inputs. No external pull-up resistors or buffer stages are needed when interfacing with standard 5 V TTL devices, simplifying design for the CD4502BM.
CD4502BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 3.4mA, 20.4mA
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD4502BM FAQ
1.How can I place an order for CD4502BM through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4502BM 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 CD4502BM reliable?
The price and inventory of CD4502BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4502BM is usually 5 days.
3.What payment methods are accepted for CD4502BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4502BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4502BM?
CD4502BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4502BM 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 CD4502BM?
For technical support, including CD4502BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4502BM requirements.
6.How does Aetrix verify that CD4502BM is sourced from the original manufacturer or authorized distributors?
All CD4502BM 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 CD4502BM meets industry standards.
7.What is the process for return or replacement of CD4502BM?
All CD4502BM units undergo pre-shipment inspection (PSI). If there is an issue with CD4502BM, 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 CD4502BM part is unused and in its original packaging.
Return procedure for CD4502BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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