CD4503BE - 6-Channel 3-18V Tri-State Buffer | Texas Instruments
料号： CD4503BE ✓ 量产中CD4503BE 概述
A logic buffer or buffer amplifier is a digital IC that provides buffering, isolation, or current drive between circuit sections. The CD4503BE belongs to the CMOS logic family, whose hierarchy is tri-state buffer, non-inverting buffer, digital logic IC, and semiconductor. Unlike a simple inverter, this device preserves input logic polarity while adding three-state output control. It is useful where multiple logic devices must share a data path without driving each other simultaneously.
The six outputs use push-pull drive and can be disabled independently in two groups: one control disables four buffers, while the other disables the remaining two. This grouped control enables a four-channel data bus and a two-channel control or status bus to be isolated together. A 16-pin CD4503BE is useful when a design needs more conventional digital voltage levels than low-voltage CMOS families provide.
The CD4503B operates from 3 V to 18 V and is specified with 5 V, 10 V, and 15 V parametric ratings. The manufacturer reports a maximum input current of 1 µA at 18 V across the full package-temperature range and 100 nA at 18 V and 25°C. These leakage characteristics are important when the disabled outputs connect to a shared bus because they influence how quickly a released node can be driven by another device.
Typical uses include multiplexed control signals, address or data-bus isolation, interface buffering between independently timed logic sections, and general-purpose tristate fanout. The device is particularly appropriate when several outputs need to share a conductor but must not contend when inactive. It can also buffer control signals entering a wider or longer system-level bus while preserving non-inverting logic behavior.
Designers should account for the truth table and polarity of both disable inputs, including their effect on output state and output polarity. Disable-control inputs should not be left floating, and external pull-up or pull-down resistors may be required where a control can enter an undefined state during power-up. When two devices drive the same shared line, only one group should be enabled at a time to prevent shoot-through current and an undefined voltage.
This page combines manufacturer specifications, distributor availability, verified pin-compatible cross-references, package details, and practical selection guidance. It also distinguishes true same-package drop-in options from functional substitutes, helping engineers evaluate CD4503BE replacements without assuming that equivalent logic functions always share the same footprint.
直接替换替代料： CD4503BE ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
CD4503BC
✅ 直接替换📋 参考替代料（不在目录中）
MC14503
✅ 直接替换📋 参考替代料（不在目录中）
MM80C97
✅ 直接替换📋 参考替代料（不在目录中）
340097
✅ 直接替换📋 参考替代料（不在目录中）
CD4503BE 最大额定值与电气特性
| Device Type | Hex non-inverting buffer with 3-state outputs |
| Logic Level | CMOS |
| Number of Channels | 6 channels |
| Number of Elements | 2 elements with 3 bits per element |
| Output Polarity | Non-inverting |
| 输出类型 | Push-pull, 3-state |
| Supply Voltage Range | 3 V to 18 V |
| Parametric Voltage Ratings | 5 V, 10 V, and 15 V |
| Disable Control 1 | Controls 4 buffers |
| Disable Control 2 | Controls 2 buffers |
| Maximum Input Current | 1 µA at 18 V over the full package-temperature range |
| Input Current at Room Temperature | 100 nA at 18 V and 25°C |
| 封装 | 16-lead dual-in-line plastic package (E suffix) |
| 引脚数量 | 16 pins |
| 安装类型 | Through-hole |
| JEDEC Qualification | Meets JEDEC Tentative Standard No. 13B requirements for B-series CMOS devices |
CD4503BE 引脚配置
| 引脚 1 | A IN — Non-inverting buffer A input |
| 引脚 2 | A OUT — Non-inverting buffer A output |
| 引脚 3 | B IN — Non-inverting buffer B input |
| 引脚 4 | B OUT — Non-inverting buffer B output |
| 引脚 5 | C IN — Non-inverting buffer C input |
| 引脚 6 | C OUT — Non-inverting buffer C output |
| 引脚 7 | D IN — Non-inverting buffer D input |
| 引脚 8 | D OUT — Non-inverting buffer D output |
| 引脚 9 | E IN — Non-inverting buffer E input |
| 引脚 10 | E OUT — Non-inverting buffer E output |
| 引脚 11 | F IN — Non-inverting buffer F input |
| 引脚 12 | F OUT — Non-inverting buffer F output |
| 引脚 13 | DISABLE 1 — Disable control for four buffers |
| 引脚 14 | DISABLE 2 — Disable control for two buffers |
| 引脚 15 | VDD — Positive supply terminal |
| 引脚 16 | VSS — Ground or negative supply terminal |
典型应用
CD4503BE 适用于 6 应用s: Shared Data-Bus Isolation, Multiplexed Control-Signal Interface, Industrial Logic-Level Interfacing, Digital Test and Measurement Equipment, Retrofit and Legacy System Upgrade, Processor and Microcontroller Port Expansion.
Shared Data-Bus Isolation
The CD4503BE fits shared data-bus isolation because it provides six non-inverting buffers with three-state outputs and a 3 V to 18 V operating range. Two disable inputs allow four channels and two channels to be controlled separately, so an enabled group can drive a common conductor while the other group presents high impedance. This arrangement reduces output contention when several logic sections share a bus. The main design consideration is ensuring that only one group is enabled during each bus ownership interval. Disable inputs should also remain at defined logic states, and propagation-delay and output-current data should be checked against the bus requirements in the system timing budget.
推荐
Multiplexed Control-Signal Interface
CD4503BE is appropriate for multiplexed control-signal interfaces because its non-inverting push-pull outputs preserve control polarity while adding three-state capability. The device can isolate four channels through one disable input and two additional channels through the second, enabling a compact grouped-bus arrangement across a 3 V to 18 V system. Compared with driving shared nodes directly, the controlled high-impedance state reduces contention between competing logic sections. Engineers should account for the disable truth table and allow adequate timing margin between changing enable ownership and changing data. The manufacturer-reported input leakage of 1 µA at 18 V should be included when analyzing lightly loaded control nodes.
推荐
Industrial Logic-Level Interfacing
The CD4503BE can interface older industrial logic sections with a 3 V to 18 V supply environment while providing buffered push-pull drive. Its six non-inverting channels help maintain signal polarity and reduce loading on the driving logic, while three-state outputs support systems that need controlled isolation. The broad 3 V to 18 V range is useful in equipment where several historical CMOS voltage levels must coexist. Before using the part in an industrial system, verify the required operating temperature, noise immunity, timing, and output-current limits from the current manufacturer datasheet. Disable pins must be actively managed so that a control line cannot float during reset, power-up, or a firmware fault.
推荐
Digital Test and Measurement Equipment
CD4503BE is suitable in digital test and measurement equipment where multiple control or status lines must be buffered, isolated, or connected selectively. Its six three-state outputs permit test buses to be released while another instrument or circuit owns the same conductive path. The non-inverting arrangement preserves the intended control-command polarity, and the 3 V to 18 V supply range supports legacy and mixed-voltage logic assemblies. The primary engineering task is verifying that disable transitions occur outside the measurement window and that the selected package remains available. Timing behavior should be compared with the instrument’s control sequence, while disabled outputs should not be relied upon as active logic levels because their state is intended for high-impedance bus release.
推荐
Retrofit and Legacy System Upgrade
The CD4503BE is well matched to retrofit and legacy-system upgrades that retain 16-pin through-hole CMOS logic footprints. It provides a six-channel, non-inverting tri-state buffer operating from 3 V to 18 V, allowing existing board architectures to buffer or isolate signals without changing the logic polarity. The E-package form also supports repair workflows and hand-soldered prototype assemblies. Engineers should still compare the replacement part’s temperature grade and electrical limits rather than assuming every CD4503-family code is equivalent. A like-for-like substitution should preserve the supply pins, six data paths, disable-control truth table, and physical pin numbering. Bill-of-material changes should also account for lifecycle notices and any changes in sourcing channel.
推荐
Processor and Microcontroller Port Expansion
CD4503BE can provide grouped three-state buffering between a microcontroller or processor interface and external logic. Six non-inverting channels are available, with one disable input controlling four channels and another controlling two, which suits ports divided into differently timed functional groups. The output buffers isolate the controller from heavier external loading while retaining a simple 3 V to 18 V CMOS interface. Firmware must guarantee that conflicting groups are never enabled simultaneously, and the disable inputs should have defined states during reset. Engineers should also verify timing against the host clock and account for the manufacturer-reported maximum input current of 1 µA at 18 V when the circuit includes high-impedance control states.
推荐
推荐产品汇总
工程参考数据： CD4503BE ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CD4503BC | MC14503 | MM80C97 | 340097 |
|---|---|---|---|---|---|
| Package | 16-PDIP | 16-PDIP | 16-PDIP | 16-PDIP | 16-PDIP |
| Brand | Texas Instruments | Motorola | Motorola | Motorola | Motorola |
| Function | Hex non-inverting buffer with three-state outputs | Hex non-inverting buffer with three-state outputs | Industry-compatible CD4503 type | Industry-compatible CD4503 type | Industry-compatible CD4503 type |
关键差异点
- Manufacturer-documented industry pin compatibility （对比 MC14503)
- Two grouped tri-state disable controls （对比 CD4503BC)
- Wide legacy CMOS supply range （对比 340097)
设计说明
Do not enable multiple CD4503BE output groups simultaneously when they connect to the same conductor. Although the outputs are three-state and intended for bus sharing, two actively driven outputs can create shoot-through current and an undefined bus voltage. Define ownership in reset and firmware logic, give the disable inputs stable levels during power-up, and confirm the disable polarity and timing from the manufacturer truth table before laying out the control signals.
Treat the six data inputs as ordinary CMOS logic inputs and do not allow a disabled output’s prior data value to be interpreted as an active command. The three-state condition releases the physical bus rather than forcing a guaranteed logic state. If downstream circuitry cannot tolerate high impedance, add a suitable pull-up or pull-down outside the device. Also avoid relying on disabled outputs as system reset or fault indications; use a dedicated latched signal where a defined inactive state is required.
Place the CD4503BE in the conventional 16-pin DIP orientation and route each data input directly to its corresponding buffer input. Keep disable traces away from high-current switching nodes, and place any bus pull-up or pull-down components close to the shared node. Since the device is a through-hole logic part rather than a high-speed serial device, ordinary short digital traces are generally sufficient, but timing still depends on the complete source, load, and remote-bus implementation.
合规信息
The supplied manufacturer and distributor data identifies JEDEC Tentative Standard No. 13B compatibility but does not provide explicit RoHS, REACH, halogen-free, lead-free, or conflict-minerals declarations for CD4503BE. AEC-Q100 is not applicable to this general-purpose CMOS logic device.
