MC14407L - Full-Duplex 8-Bit PCM Codec | Motorola
MPN： MC14407L ✗ 停產MC14407L 概覽
A PCM codec is a semiconductor interface IC that performs the digital conversion required by pulse-code-modulation communication systems. In the hierarchy of electronic components, a codec belongs to the interface IC and telecom-interface categories, between general-purpose integrated circuits and complete voice-processing subsystems. Companded PCM reduces the number of bits required to represent selected voice-amplitude ranges while retaining a representation suitable for transmission over digital communication links.
The MC14407L supports both A-law and mu-law operation, allowing it to match common digital telephony signaling conventions. Its full-duplex architecture supports simultaneous transmit and receive signal paths, making it suitable for channel interfaces, terminal adapters, and telecommunications equipment that exchange PCM data with a line interface or digital switching system. The 24-pin CDIP package also provides a through-hole construction for systems assembled with conventional axial or DIP-compatible processes.
Operation across -40°C to +85°C supports industrial-temperature telecommunications equipment, although the available evidence does not specify a modern automotive qualification. The MC14407L is a legacy Motorola Semiconductor device rather than a contemporary lead-free-focused component. Consequently, engineers should confirm current availability, original construction details, obsolete-material conditions, and revision-specific timing or electrical limits against the manufacturer datasheet and the authorized distributor documentation before committing a new design.
Typical uses include PCM switching interfaces, digital telephone terminal equipment, voice-channel converters, telecommunications multiplexers, and embedded systems that need an A-law or mu-law PCM codec. System-level implementation also depends on the connected line-interface or DSP device, clocking arrangement, signal framing, and board-level decoupling specified in the original design documentation.
The principal design consideration is that MC14407L is a legacy through-hole codec, so a modern replacement cannot be selected from package size alone. The replacement should be verified for pin-to-pin behavior, clock mode, companding law, power requirements, timing margins, and channel direction. This page synthesizes the verified distributor and datasheet references, sourcing information, and cautious replacement guidance that are not consolidated in a single manufacturer product page.
直接替換替代品，適用於 MC14407L — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品MC14407L 規格
| Device Type | Full-duplex PCM codec |
| 解析度 | 8 bit |
| Companding | A-law and mu-law |
| Duplex Mode | Full duplex |
| Signal Type | Companded PCM |
| 封裝 | 24-pin CDIP |
| Package Type | Ceramic DIP |
| 安裝類型 | Through-hole |
| 腳位數 | 24 pins |
| 工作溫度範圍 | -40°C to +85°C |
| Application Category | Telecommunication interface IC |
| Manufacturer | Motorola Semiconductor |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
MC14407L ceramic dip 腳位配置指南
MC14407L（ceramic dip 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MC14407L.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC14407L 適用於 6 應用s: Digital Telephony Terminal Interfaces, Telecommunications Channel Converters, PCM Switching Interface Equipment, Voice Multiplexer Backplanes, Legacy Voice Processing Systems, Digital Voice Test Equipment.
Digital Telephony Terminal Interfaces
The MC14407L fits digital telephone terminal equipment that must exchange 8-bit companded PCM voice samples. Its verified support for A-law and mu-law provides compatibility with common digital telephony signaling conventions, while the full-duplex architecture supports separate transmit and receive paths. The 24-pin CDIP package supports through-hole assembly in established equipment. Exact clock, framing, and control details must be taken from the original datasheet, and original-stock traceability is essential because the available data does not establish ongoing production status.
Telecommunications Channel Converters
MC14407L is suitable for a channel-converter subsystem that translates between an external PCM stream and the voice-processing section of a telecommunications system. The device provides the core 8-bit companded PCM conversion function identified in the manufacturer documentation, with A-law and mu-law support allowing deployment in systems using either convention. Full-duplex operation reduces the need for separate unidirectional codec paths. Board-level implementation must preserve the original timing, clocking, grounding, and decoupling arrangement because those details are not included in the supplied search records.
PCM Switching Interface Equipment
The MC14407L can be used in legacy PCM switching and multiplexing equipment where a channel needs an 8-bit companded PCM interface. Its full-duplex PCM codec function supports bidirectional traffic through one codec position, while A-law and mu-law operation increases compatibility with different digital telephony systems. The -40°C to +85°C operating range is suitable for many industrial environments. However, the ceramic DIP package is physically large compared with modern surface-mount codecs, and a new design should weigh redesign cost against device availability and lifecycle uncertainty.
Voice Multiplexer Backplanes
In a voice multiplexer backplane, MC14407L can provide the PCM-side conversion required between voice channels and a digital transport or switching path. The verified 8-bit resolution and support for A-law and mu-law align with legacy digital voice-processing architectures, and full-duplex operation suits bidirectional channel traffic. Because the device is a through-hole CDIP-24 part, designers must account for connector density and board insertion requirements. Signal-integrity decisions, including clock routing and return paths, should follow the original reference design rather than assumptions based on modern codec layouts.
Legacy Voice Processing Systems
MC14407L is appropriate for maintenance and expansion of legacy voice-processing systems that already standardize on an 8-bit A-law or mu-law PCM codec. Using the documented device can preserve the established interface behavior while avoiding a high-risk board-level conversion. Its industrial temperature range of -40°C to +85°C supports controlled indoor equipment, but it does not by itself establish compliance with automotive, medical, or safety-critical requirements. Procurement teams should request original manufacturer stock, change-history evidence, and inspection records before using it in long-lived systems.
Digital Voice Test Equipment
MC14407L can be incorporated into specialized digital voice test equipment that needs a standardized companded PCM endpoint. Its 8-bit A-law and mu-law support allows the test system to exercise equipment connected through legacy PCM interfaces, while full-duplex behavior supports loopback and bidirectional test arrangements. The through-hole CDIP-24 package simplifies retrofitting into older instrument chassis. Designers must still validate signal timing, clock relationships, framing, and logic levels against the manufacturer datasheet and should avoid treating the codec as a complete line-interface solution by itself.
工程參考資料，適用於 MC14407L — 比較、設計指引及合規資訊。
選型指南
主要差異化特點
- Combined A-law and mu-law support (對比Generic 8-bit PCM codec)
- Full-duplex signal handling (對比Simplex PCM interface device)
- Established 24-pin CDIP construction (對比Modern surface-mount codec)
設計說明
Do not approve a substitute from package appearance alone. The verified MC14407L record establishes a 24-pin CDIP package, 8-bit resolution, A-law and mu-law support, and full-duplex operation, but it does not provide a complete pinout or electrical table. Before replacing the device, compare power pins, clock inputs, frame timing, control inputs, PCM data buses, analog-side connections, logic thresholds, absolute maximum ratings, and package pin numbering against the manufacturer datasheet.
Confirm the original supply-voltage range and pin sequence before board rework because those values are not included in the verified records. Use the manufacturer datasheet for decoupling and power-up requirements rather than copying values from a modern codec. For a legacy through-hole repair, inspect the socket and board for oxidation, cracked joints, and electrostatic-damage risk; a newly soldered MC14407L can still fail if the original system rail sequence or grounding practice was abnormal.
Clock and PCM data routing should follow the original reference layout as closely as possible. Keep clock and data paths short, maintain a continuous return path, and avoid routing sensitive voice-side connections beside high-energy switching nodes. Because the supplied data does not specify operating frequency, logic levels, or timing margins, do not derive new timing limits or rise-time requirements from general PCM assumptions; extract them from the applicable Motorola datasheet.
Procurement requires special attention because MC14407L is a legacy Motorola Semiconductor product and the verified results mix distributor inventory, archived stock figures, and general search snippets. Request the manufacturer part marking, date code, packaging condition, and traceability documentation. Confirm electrical performance after installation, especially if the offered unit is recovered stock. Treat a marketplace listing as an acquisition lead rather than proof of lifecycle status or future production availability.
合規資訊
The supplied search records do not provide authoritative RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 qualification is not stated and is therefore recorded as not_qualified.
