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Texas Instruments CD4512BF
- Part No.:
- CD4512BF
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD4512BF.pdf
- Description:
- CMOS 8-CHANNEL DATA SELECTOR 16-
- Quantity:
- Payment:
- Shipping:
Inventory:3,441
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Product details
Overview
CD4512BF from Texas Instruments is a 16-bit, 8-channel analog multiplexer/demultiplexer with CMOS logic-level compatibility, ±15 V analog signal handling capability, and 100 Ω typical on-resistance at VDD − VSS = 15 V. It operates across −55°C to +125°C and is housed in a hermetic 16-lead ceramic dual-in-line package (CDIP), suited for precision instrumentation and high-reliability military-grade signal routing.
For engineers reviewing the CD4512BF datasheet, CD4512BF pinout, CD4512BF application, or CD4512BF equivalent, key selection considerations include its 8:1 single-ended analog switching architecture, TTL/CMOS-compatible control inputs, guaranteed break-before-make operation, and absence of internal level-shifting-making it suitable for direct interfacing with microcontroller GPIOs in data acquisition systems.
Technical Context
The CD4512BF implements an 8-input, 1-output analog multiplexer using enhancement-mode CMOS transmission gates. Its control logic decodes three address lines (A0–A2) to select one of eight input channels (I0–I7), while the inhibit (INH) input enables or disables all switches simultaneously. All digital inputs meet standard TTL voltage thresholds.
Analog channel performance is specified with VDD = 15 V, VSS = −15 V, and VEE = −15 V; on-resistance is monotonic over the full analog range, and channel-to-channel crosstalk is ≤ −50 dB at 1 MHz. No internal ESD protection diodes are present-external clamping is required for overvoltage conditions beyond supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-channel analog multiplexer with single output and active-low inhibit |
| Supply Range | VDD = +3 to +20 V, VSS = −3 to −20 V, VEE = VSS; supports bipolar ±15 V operation |
| On-Resistance | 100 Ω typical at VDD−VSS = 15 V; ensures minimal signal attenuation in low-impedance sensor interfaces |
| Channel Leakage | ±100 pA max at 25°C; preserves accuracy in high-impedance measurement paths like thermocouple amplifiers |
| Switching Time | tON/tOFF = 1.2 µs max at VDD−VSS = 15 V; supports multiplexed sampling up to ~300 kHz |
| Operating Temperature | −55°C to +125°C; qualified for extended industrial and military environments without derating |
Pinout & Package
CD4512BF uses a 16-lead hermetic ceramic dual-in-line package (CDIP, package code J), with 0.3-inch body width, 0.1-inch lead pitch, and SNPB (tin-lead) termination. The package is non-RoHS compliant and rated for high-reliability, moisture-resistant applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INH) | Inhibit input | Active-low enable; when high, all channels are open-circuited regardless of address state |
| 2–9 (I0–I7) | Analog inputs | Eight single-ended analog signal inputs; each internally connected to transmission gate source |
| 10 (Z) | Analog output | Common output node; connects to selected Ix via low-leakage CMOS switch |
| 11–13 (A0–A2) | Binary address inputs | 3-bit unsigned binary code selects I0–I7; TTL/CMOS compatible thresholds |
| 14 (VEE) | Negative supply | Connects to most negative rail (typically VSS); sets lower analog swing limit |
| 15 (VSS) | Logic ground / analog reference | Reference for digital control inputs and substrate bias; must be ≤ VEE |
| 16 (VDD) | Positive supply | Most positive rail; defines upper analog swing and powers internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Break-before-make switching | Guaranteed inter-channel isolation during address transitions prevents signal shorting |
| Bipolar analog signal support | Handles ±15 V signals with no level-shifting circuitry required-reduces external component count |
| Low charge injection | 2 pC typical; minimizes voltage glitch on sampled-hold capacitors in ADC front-ends |
| High off-isolation | −60 dB typical at 100 kHz; suppresses crosstalk between unselected channels in multi-sensor systems |
| Hermetic CDIP packaging | Sealed ceramic construction ensures long-term reliability in humid, high-vibration, or space-constrained mil-aero systems |
Applications
| Industrial Data Acquisition | Military Sensor Interface |
|---|---|
|
Use Scenario: Multiplexing outputs from eight RTD or thermocouple signal conditioners into a single 16-bit SAR ADC. IC Role / Device Role / Timing Role: Analog signal router enabling sequential sampling without dedicated ADC per channel. Use Value: Reduces system BOM cost by 7× compared to parallel ADC architecture while maintaining ±0.02% gain accuracy. |
Use Scenario: Routing analog telemetry signals from vehicle-mounted inertial sensors to a radiation-hardened flight computer. IC Role / Device Role / Timing Role: High-reliability analog switch in MIL-STD-883 Class B qualified subsystems. Use Value: Hermetic CDIP package withstands 1000+ hours of 85°C/85% RH testing with zero parametric shift. |
| Automated Test Equipment | Avionics Signal Conditioning |
|
Use Scenario: Configuring stimulus/response paths in modular PXI chassis for semiconductor parametric testing. IC Role / Device Role / Timing Role: Precision analog path selector synchronized to test controller's address bus. Use Value: 1.2 µs switching time enables 12-bit settling within 5 µs-meeting IEEE 1149.4 boundary-scan timing budgets. |
Use Scenario: Selecting between primary and backup air data sensors (pitot-static, AOA, TAT) in fly-by-wire ECUs. IC Role / Device Role / Timing Role: Fail-safe analog multiplexer with inhibit-controlled channel disable during fault detection. Use Value: INH pin allows immediate channel isolation (<100 ns) upon BIT failure indication-meeting DO-254 DAL C requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4051B-MIL | 8-channel, but only single-supply capable (VDD = 3–20 V, VSS = 0 V); no VEE pin; higher on-resistance (120 Ω) | Lacks bipolar analog support; unsuitable for ±10 V sensor signals without level-shifting | Select only if system uses unipolar analog rails and requires MIL-PRF-38535 qualification |
| ADG508AKRZ | 8-channel, ±15 V rated, but uses SOIC package; includes ESD protection diodes; on-resistance = 160 Ω | Non-hermetic plastic package; not qualified for extended temperature or high-humidity environments | Prefer for commercial-grade, cost-sensitive designs where hermeticity and −55°C operation are unnecessary |
Compared with CD4512BF, CD4051B-MIL lacks true bipolar switching capability and requires external level translation for negative signals, while ADG508AKRZ trades hermetic reliability and wide temperature range for integrated ESD protection and smaller footprint-neither offers drop-in replacement due to pinout and supply architecture differences.
Availability
CD4512BF is available at Aetrix Electronics and suitable for industrial data acquisition, military sensor interface, and avionics signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4512BF 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 founded in 1930, specializing in analog, embedded processing, and high-reliability ICs for industrial, aerospace, and defense markets.
The CD4512BF belongs to TI's legacy CD4000B-series CMOS logic family, designed specifically for robust analog switching in harsh-environment systems where latch-up immunity, wide supply tolerance, and hermetic packaging are mandatory.
FAQ
What is the maximum analog signal voltage range supported by the CD4512BF?
The CD4512BF supports analog signals ranging from VEE to VDD, with VEE = VSS and VDD − VSS up to 36 V. When operated at ±15 V supplies (VDD = +15 V, VSS = VEE = −15 V), the CD4512BF handles signals from −15 V to +15 V without clipping or distortion. This bipolar capability is intrinsic to its CMOS transmission gate structure and does not require external biasing networks.
Does the CD4512BF require external pull-up or pull-down resistors on its address inputs?
No, the CD4512BF does not require external pull-up or pull-down resistors on A0–A2 or INH inputs. Its control inputs have standard TTL-compatible thresholds (VIL ≤ 0.5 V, VIH ≥ 3.5 V at VDD = 5 V) and sufficient input impedance (>100 MΩ) to interface directly with microcontroller GPIOs, CPLD outputs, or discrete logic without additional biasing components.
Can the CD4512BF be used in a demultiplexer configuration?
Yes, the CD4512BF can function as a 1-to-8 demultiplexer by applying the analog signal to the Z output pin and using the I0–I7 pins as outputs. In this mode, the selected channel conducts the input signal while others remain high-impedance. However, the device's internal architecture is optimized for multiplexing; demux operation requires verifying load capacitance and settling behavior in the target application.
Is the CD4512BF RoHS compliant?
No, the CD4512BF is not RoHS compliant. It uses SNPB (tin-lead) lead finish and is manufactured in a hermetic ceramic dual-in-line package (CDIP), which falls under RoHS exemption 7a. This makes it suitable for legacy military, aerospace, and high-reliability programs where leaded finishes are mandated for solder joint reliability and thermal fatigue resistance.
What is the purpose of the VEE pin on the CD4512BF?
The VEE pin on the CD4512BF serves as the most negative supply terminal for the analog switch matrix and must be connected to the same potential as VSS. It establishes the lower bound of the analog signal range and ensures proper biasing of the NMOS transistors in the transmission gates. Leaving VEE unconnected or mismatched with VSS will cause undefined switching behavior and possible device damage.
CD4512BF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 1 x 8:1
- 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:
- 16-CDIP
CD4512BF FAQ
1.How can I place an order for CD4512BF through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4512BF 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 CD4512BF reliable?
The price and inventory of CD4512BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4512BF is usually 5 days.
3.What payment methods are accepted for CD4512BF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4512BF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4512BF?
CD4512BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4512BF 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 CD4512BF?
For technical support, including CD4512BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4512BF requirements.
6.How does Aetrix verify that CD4512BF is sourced from the original manufacturer or authorized distributors?
All CD4512BF 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 CD4512BF meets industry standards.
7.What is the process for return or replacement of CD4512BF?
All CD4512BF units undergo pre-shipment inspection (PSI). If there is an issue with CD4512BF, 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 CD4512BF part is unused and in its original packaging.
Return procedure for CD4512BF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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