CD4503BF - 6-Channel 3-State CMOS Buffer | Texas Instruments
N.º de pieza: CD4503BF ✓ ActivoCD4503BF Descripción general
A CMOS buffer is a digital logic IC that reproduces an input signal at its output while providing electrical buffering and increased drive capability. The CD4503BF belongs to the broader CMOS buffer family, which falls within logic ICs, interface ICs, digital semiconductors, and discrete or integrated circuit signal-conditioning products. Its three-state outputs allow each channel to present a normal logic level or enter a high-impedance state, making the device useful where multiple drivers share a bus.
The principal features include six non-inverting channels, three-state output control, two disable inputs, operation across a 3 V to 18 V supply range, and one TTL-load output-drive capability. One disable control governs four buffers, while the other controls the remaining two buffers. According to the Texas Instruments CD4503B product data, the device is pin compatible with the MM80C97, MC14503, and 340097 industry types and supports 5 V, 10 V, and 15 V parametric ratings.
The maximum input current is specified as 1 µA at 18 V over the full package-temperature range and 100 nA at 18 V and 25°C. These low leakage characteristics help reduce static-current demand in high-impedance states. The CD4503BF uses the CD4503B logic architecture but is offered in a military-style 16-CDIP package, making it relevant to legacy control, instrumentation, industrial, and defense-related systems that require a through-hole ceramic package.
Typical uses include bus-interface isolation, multi-driver data buses, address or control-line buffering, test-equipment input conditioning, and legacy computer or industrial-control systems. Because three-state outputs share a common signal path, the system must guarantee that only one enabled driver actively sources or sinks current at a time. Disabled channels should be treated as high-impedance nodes rather than additional pull-up or pull-down devices.
The principal design consideration is ensuring correct enable polarity, adequate input levels at every supply voltage, and safe bus contention. Decode the two disable inputs separately because they control different groups of channels. Validate output leakage, source current, sink current, and propagation behavior against the actual bus load before treating the CD4503BF as a direct substitute for a lower-voltage modern logic device.
This page consolidates verified manufacturer and distributor information, documented pin-compatible industry references, practical bus-buffer design guidance, and a parameter comparison intended to clarify replacement decisions. It separates verified electrical facts from unavailable details and avoids treating merely similar functions as guaranteed drop-in replacements.
Alternativas directas para CD4503BF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
CD4503B-MIL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MM80C97
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC14503
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
340097
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CD4503BF Valores máximos y características eléctricas
| Product Type | Hex non-inverting CMOS buffer with three-state outputs |
| Number of Channels | 6 channels |
| Elements | 2 elements, 4 bits per element |
| Supply Voltage Range | 3 V to 18 V |
| Parametric Voltage Ratings | 5 V, 10 V, and 15 V |
| Configuración de salida | Non-inverting, three-state |
| Output Disable Controls | 2 independent controls |
| Disable Control 1 Coverage | 4 buffers |
| Disable Control 2 Coverage | 2 buffers |
| Maximum Input Current | 1 µA at 18 V over the full package-temperature range |
| Input Current at 25°C | 100 nA at 18 V |
| Output Drive Capability | 1 TTL-load output-drive capability |
| Pin Compatibility | Compatible with MM80C97, MC14503, and 340097 industry types |
| Encapsulado | 16-pin CDIP (J) |
| Tipo de montaje | Through-hole |
| Estado RoHS | Non-compliant |
| AEC-Q100 Qualification | Not applicable |
Configuración de pines de CD4503BF
| Pin 1 | 1A — Data input for buffer channel 1 |
| Pin 2 | 2A — Data input for buffer channel 2 |
| Pin 3 | 3A — Data input for buffer channel 3 |
| Pin 4 | 4A — Data input for buffer channel 4 |
| Pin 5 | 5A — Data input for buffer channel 5 |
| Pin 6 | 6A — Data input for buffer channel 6 |
| Pin 7 | GND — Ground reference |
| Pin 8 | 6Y — Three-state output for buffer channel 6 |
| Pin 9 | 5Y — Three-state output for buffer channel 5 |
| Pin 10 | 4Y — Three-state output for buffer channel 4 |
| Pin 11 | 3Y — Three-state output for buffer channel 3 |
| Pin 12 | 2Y — Three-state output for buffer channel 2 |
| Pin 13 | 1Y — Three-state output for buffer channel 1 |
| Pin 14 | LE1 — Output-disable control for four buffers |
| Pin 15 | LE2 — Output-disable control for two buffers |
| Pin 16 | VCC — Positive supply voltage |
Aplicaciones típicas
CD4503BF es adecuado para 6 aplicacións: Legacy Multi-Driver Data Bus, Address-Line Buffering, Industrial Control Signal Conditioning, Test and Measurement Input Buffering, Defense and Military Electronic Modules, Vintage Computer Interface Boards.
Legacy Multi-Driver Data Bus
The CD4503BF fits legacy systems in which several logic nodes must connect to a shared data bus without driving it simultaneously. Its six non-inverting channels and three-state outputs allow selected drivers to be enabled while the others assume a high-impedance state. Two disable inputs provide separate control over groups of four and two channels, simplifying partitioning of address, data, or control paths. The documented 3 V to 18 V supply range also supports older equipment operating at 5 V, 10 V, or 15 V. During implementation, designers must guarantee exclusive enable control and verify source current, sink current, and propagation delay against the bus loading before enabling multiple board assemblies.
Recomendado
Address-Line Buffering
The CD4503BF can buffer address lines in legacy processor and memory-interface systems where a driver must remain isolated from a shared bus during an inactive interval. Each of its six non-inverting channels can be placed in the high-impedance state through the two disable controls. Its 3 V to 18 V operating range accommodates legacy voltage levels commonly found in industrial and defense electronics. The main design consideration is timing: disable and enable transitions must not overlap with another device’s active output, and the selected channel must preserve valid address levels over the required bus capacitance and temperature range.
Recomendado
Industrial Control Signal Conditioning
The CD4503BF is appropriate for older industrial-control systems that need buffered control signals and bus isolation rather than modern high-speed logic. Six channels provide flexible grouping, while two disable inputs allow four outputs and two outputs to be controlled independently. The 16-CDIP package supports through-hole construction and repair workflows commonly encountered in legacy production equipment. Designers should evaluate the undocumented-for-this-output maximum propagation delay and output-current limits against the actual control network. Pull-up and pull-down components may be required only when the system specification requires a defined bus level during the high-impedance interval.
Recomendado
Test and Measurement Input Buffering
The CD4503BF can isolate or distribute low-frequency digital control and measurement signals in legacy test equipment. Its non-inverting channels preserve logic polarity, and the three-state outputs make it possible to connect several instrument or fixture nodes to a common measurement-control bus while preventing contention. Operation from 3 V to 18 V supports vintage test-system logic levels. An instrument designer must still verify input leakage, output drive, and switching behavior at the intended clock or update rate. Grounding and supply-decoupling practices remain important because a high-impedance measurement node can be affected by leakage and capacitive coupling even when the CD4503BF itself is operating correctly.
Recomendado
Defense and Military Electronic Modules
The CD4503BF is relevant to military electronic modules that specifically depend on the CD4503B architecture and a 16-CDIP package. The verified manufacturer listing identifies CD4503BF as the military ordering option of a 6-channel, 3 V to 18 V buffer. The two independently grouped disable controls support partitioned bus ownership and controlled isolation within a larger module. However, the part is not identified as AEC-Q100 automotive qualified and the supplied data does not establish a complete military qualification matrix. Procurement should therefore require traceability, date-code, inspection, and certificate documentation appropriate to the applicable defense program.
Recomendado
Vintage Computer Interface Boards
The CD4503BF is well suited to vintage computer interface boards requiring a through-hole CMOS buffer with selectable high-impedance outputs. Its six channels can buffer control, address, or acknowledgment signals where multiple interface sections may share a bus. The 3 V to 18 V range covers many legacy logic domains, and the manufacturer-documented compatibility with MC14503 and related industry types supports repair sourcing. Designers restoring older equipment must pay close attention to signal direction, disable polarity, and bus contention. They should also compare the exact replacement’s propagation delay and output-current ratings with the original system timing and loading, because functional equivalence alone does not guarantee timing equivalence.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CD4503BF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CD4503B-MIL | MM80C97 | MC14503 | 340097 |
|---|---|---|---|---|---|
| Package | 16-CDIP (J) | 16-CDIP (J) | 16-pin DIP | 16-pin DIP | 16-pin DIP |
| Brand | Texas Instruments | Texas Instruments | Motorola | Motorola | Motorola |
| Function | Hex non-inverting buffer with three-state outputs | Hex non-inverting buffer with three-state outputs | Pin-compatible industry type | Pin-compatible industry type | Pin-compatible industry type |
| Number of Channels | 6 channels | 6 channels | 6 channels | 6 channels | 6 channels |
| Documented Pin Compatibility | MM80C97, MC14503, and 340097 | MM80C97, MC14503, and 340097 | Industry type listed as compatible with CD4503B | Industry type listed as compatible with CD4503B | Industry type listed as compatible with CD4503B |
Diferenciadores clave
- Military CDIP ordering option within the CD4503B family (frente a CD4503BE)
- Manufacturer-documented compatibility with three industry buffer families (frente a MC14503)
- Two grouped disable controls support segmented bus ownership (frente a 340097)
- Specified low input leakage across the full temperature range (frente a MM80C97)
Notas de diseño
Do not allow two enabled outputs to drive the same bus node. The CD4503BF has separate disable controls for groups of four and two buffers, so system logic must enforce non-overlapping ownership whenever separate drivers share a conductor. Treat every disabled output as a high-impedance node and add pull-up or pull-down components only when the interface specification requires a defined inactive level.
Operate the CD4503BF only within its documented 3 V to 18 V supply range, and do not infer 5 V-only compatibility from the industry cross-reference. Decouple the supply near the device with conventional ceramic bypass capacitance and maintain a low-impedance ground return. Because input leakage reaches 1 µA at 18 V over the full package-temperature range, verify that leakage does not disturb high-impedance nodes used for level sensing or wired bus termination.
Preserve the exact 16-CDIP pin assignment and maintain clearance around adjacent through-hole leads. Route high-impedance bus traces away from clock, switching-node, and high-current return paths to reduce capacitive coupling. If outputs are disabled for long intervals, include any required passive bias network close to the receiver or bus node so that leakage and induced noise cannot move the shared line outside its valid logic threshold.
A functionally similar buffer is not automatically a qualified substitute. Before replacing CD4503BF, compare supply range, temperature grade, propagation delay, source current, sink current, input leakage, disable polarity, and package construction. The manufacturer explicitly lists MM80C97, MC14503, and 340097 as pin-compatible industry types, but procurement should still obtain the exact suffix and data sheet for the sourced device.
Información de cumplimiento
The verified distributor listing explicitly identifies CD4503BF as RoHS non-compliant. No supplied evidence established REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable to the documented legacy military buffer function.
