112 - Mini Screw Incandescent Lamp 1.2V 264mW | CEC Industries
부품 번호: 112 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.55 | $15.50 |
| 100 | $1.18 | $118.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.74 | $740.00 |
112 개요
An incandescent lamp is a heritage lighting technology in which a tungsten filament is heated to incandescence by an electrical current, producing visible light through black-body radiation. Within the broader optoelectronics hierarchy, incandescent lamps sit alongside LEDs, neon lamps, and electroluminescent devices as direct-radiant point sources, distinguished from solid-state emitters by their warm correlated color temperature (~2700 K), high color rendering index (CRI ~100), and instantaneous warm-up. They remain preferred where broadband spectrum or electromagnetic compatibility with legacy equipment is required.
Key features of the 112 include its 1.2 V nominal operating voltage (designed for a single Ni-Cd or Ni-MH cell), 220 mA nominal lamp current, 264 mW power dissipation, a typical service life in the hundreds of hours, and a miniature Edison screw base for tool-free socket replacement. The bulb envelope is constructed of hard glass, providing resistance to thermal shock and mechanical handling in industrial environments.
From a design standpoint, the 112 operates as a purely resistive load. Its cold-to-hot filament resistance ratio of approximately 1:14 means that inrush current at switch-on is substantially higher than steady-state current, an important consideration for the driver circuit and any series-dropping components. The lamp's broadband emission spectrum makes it suitable for applications that require accurate color rendering or where the warm-up characteristic is functionally useful.
Typical applications include aircraft cockpit instrumentation, marine panel indicators, telecommunications equipment status panels, vintage radio dial lamps, and process-control annunciators. Designers should size the supply voltage and current-limiting network around the published V-I characteristic, derate for vibration, and provide adequate ventilation to maintain the rated filament temperature.
When designing with this lamp, allow at least 10% voltage headroom below the maximum rating and confirm that the supply can deliver the inrush current without sagging. Long-term reliability is dominated by filament evaporation; gentle inrush limiting (NTC thermistor or soft-start) extends service life.
This page synthesizes distributor pricing, lamp characteristic data, and drop-in alternatives not found in the manufacturer's datasheet alone.
드롭인 대체품: 112 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: 112 (동일 폼 팩터 및 풋프린트) — 차이점: Mounting Type, RoHS Status, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
CM112
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
E112
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
112A
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7382BCPZ
✅ 드롭인✓ 재고 있음
$7.5 / 개
데이터시트 보기 →ADPA1113
✅ 드롭인✓ 재고 있음
$540 / 개
데이터시트 보기 →112 사양
| Lamp Type | Incandescent |
| Manufacturer | CEC Industries |
| Part Number | 112 |
| Nominal Voltage | 1.2 V |
| Nominal Power | 264 mW |
| Nominal Current | 220 mA (calculated: 264 mW / 1.2 V) |
| Base Type | Miniature Screw (E5) |
| Bulb Style | T-1 3/4 |
| Filament Type | Vacuum tungsten |
| Lens Color | Clear |
| 실장 유형 | Socket (miniature screw) |
| RoHS 상태 | Compliant (Exemption 6c - lead in glass) |
| Lead-Free | No (contains lead in glass envelope) |
112 핀 구성
| 핀 1 | Shell (Neutral) — Miniature Edison screw threaded shell - one of two electrical contacts; polarity-insensitive |
| 핀 2 | Foot Contact (Hot) — Center foot contact at base of lamp - one of two electrical contacts; polarity-insensitive |
일반적인 애플리케이션
112 적합 용도: 6 애플리케이션s: Aircraft Cockpit Indicator Lighting, Marine and Process-Control Panel Indicators, Telecommunications Equipment Status Panels, Medical Instrument Status Indicators, Vintage Radio and Audio Dial Lamps, Test and Measurement Panel Indicators.
Aircraft Cockpit Indicator Lighting
The CEC 112's miniature Edison screw base and 1.2 V rating suit legacy aircraft electrical buses that feed 1.2 V indicator lamps directly from onboard Ni-Cd battery packs. The broadband continuous spectrum of the tungsten filament renders cockpit instrument markings with CRI ~100, which is critical for accurate color-coded warning flag interpretation under low-light NVG-compatible conditions. With service life rated in hundreds of hours at nominal voltage, the 112 provides a familiar warm 2700 K illumination that pilots and maintainers recognize across multiple airframe generations, and the E5 socket allows tool-free field replacement. Engineers should add an NTC inrush limiter to extend filament life during cold-start transients at high altitude.
추천
Marine and Process-Control Panel Indicators
Marine engine rooms and process-control panels frequently specify the 112 for status annunciators because its 1.2 V rating pairs naturally with shipboard 1.2 V Ni-Cd backup battery systems, ensuring indicator illumination continues during primary power failure. The hard-glass T-1 3/4 envelope tolerates salt-air, humidity, and vibration better than plastic-encapsulated alternatives. With ~220 mA nominal current and broadband emission, the lamp draws negligible power from the backup bus while providing unambiguous status indication. The miniature Edison screw base enables rapid field replacement without tools, and the lamp's broadband spectrum avoids the color-shifting that can occur with aged phosphor-converted LEDs in similar panel installations.
추천
Telecommunications Equipment Status Panels
Central-office telecommunications equipment commonly uses 1.2 V Ni-Cd battery plants as backup for status indicator lamps, and the CEC 112 is a long-standing industry standard for this role. Its 220 mA nominal draw is acceptable for parallel-fed panel arrays, and the E5 miniature Edison screw base allows rapid replacement during routine maintenance windows. The broadband emission is preferred over LEDs in legacy telecom installations because it preserves the warm chromatic signature that technicians associate with 'system OK' indicators, and the lamp's instant-on characteristic with no driver electronics makes it immune to the EMI concerns that affect switching-LED alternatives in RF-sensitive environments.
추천
Medical Instrument Status Indicators
Legacy medical instruments including patient monitors, infusion pumps, and defibrillators often rely on 1.2 V indicator lamps like the CEC 112 to display system status, alarm conditions, and battery-charge state. The lamp's broadband continuous spectrum enables accurate color discrimination for alarm prioritization, which is essential in clinical environments. Its purely resistive load characteristic means there is no switching noise to interfere with sensitive analog signal chains inside the instrument, and the E5 screw base allows biomedical technicians to perform field replacements without specialized equipment. Designers should validate that the lamp meets IEC 60601-1 EMI/EMC requirements for the specific instrument category.
추천
Vintage Radio and Audio Dial Lamps
Restoration of vintage tube radios and high-end audio equipment commonly specifies the CEC 112 as a direct replacement for original dial lamps. The 1.2 V rating matches the filament voltage of many tube-radio dial circuits, and the warm 2700 K correlated color temperature preserves the authentic visual character of vintage equipment when illuminated. The broadband emission also avoids the spectral gaps of LED replacements that can make vintage dial markings appear in false colors. Enthusiast restorers value the 112 specifically because its miniature Edison screw base matches original equipment sockets, eliminating the need for mechanical modification.
추천
Test and Measurement Panel Indicators
Bench-top test instruments and laboratory power supplies frequently use 1.2 V miniature screw-base indicator lamps like the CEC 112 for power-on, range-select, and fault-status indication. The lamp's purely resistive load means it does not inject switching noise into sensitive measurement circuits, an important consideration in precision instrumentation where microvolt-level measurements must coexist with front-panel indicators. The E5 miniature Edison screw base is widely supported by panel-mount lampholders from multiple vendors, giving instrument designers flexibility in mechanical layout. The 112's instant-on characteristic provides immediate visual feedback without the driver-delay of LED alternatives.
추천
추천 제품 요약
엔지니어링 참조 데이터: 112 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | CM112 | E112 | 112A | 7382 | 113 |
|---|---|---|---|---|---|---|
| Brand | CEC Industries | Chicago Miniature | Lumination | CEC Industries | CEC Industries | CEC Industries |
| Package / Base | T-1 3/4 Miniature Screw (E5) | T-1 3/4 Miniature Screw (E5) - same | T-1 3/4 Miniature Screw (E5) - same | T-1 3/4 Miniature Screw (E5) - same | T-1 3/4 Miniature Screw (E5) - same | T-1 3/4 Miniature Screw (E5) - same |
| Nominal Voltage | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 2.5 V | 2.5 V |
| Filament Type | Vacuum Tungsten | Vacuum Tungsten | Vacuum Tungsten | Vacuum Tungsten (aviation grade) | Vacuum Tungsten | Vacuum Tungsten |
| Lens Color | Clear | Clear | Clear | Clear | Clear | Clear |
| Application Grade | Standard | Standard | Standard (tight tolerance) | Aviation/High-reliability | Standard (2.5 V) | Standard (2.5 V) |
주요 차별점
- Industry-standard 1.2 V rating for Ni-Cd single-cell backup systems (vs 7382)
- Standard grade vs aviation-grade reliability tier (vs 112A)
- Drop-in compatibility with CM112 cross-manufacturer equivalent (vs CM112)
설계 노트
Estimated: The CEC 112 cold filament resistance is approximately 1/14 of its hot operating resistance, so inrush current at switch-on is ~14x the steady-state 220 mA, i.e. about 3 A peak. If the supply cannot deliver this without sagging, the lamp will appear dim and may never reach full incandescence. Add an NTC thermistor (e.g. 10 ohm cold resistance) in series with the lamp, or use a soft-start circuit, to limit inrush and extend filament life.
The T-1 3/4 glass envelope reaches roughly 80-120 C in steady-state operation at nominal 1.2 V. In enclosed panel fixtures, ensure adequate ventilation around the lampholder. Adjacent heat-sensitive components (plastic lenses, electrolytic capacitors, LEDs) should be mounted at least 15 mm away from the bulb envelope to prevent accelerated aging or thermal damage. In enclosed fixtures, derate the supply voltage by 5-10% to compensate for reduced convective cooling.
The 112 is a purely resistive load and does not require polarity-aware drivers. It will operate identically on AC or DC, making it convenient for retrofits into legacy AC-supplied indicator circuits. However, when used in battery-backed systems, the lamp draws continuous 220 mA which can rapidly deplete small Ni-Cd cells - for always-on indicators, consider a duty-cycled PWM driver or a more efficient LED alternative.
When designing a panel layout around the E5 miniature Edison screw base, allow at least 12 mm of clearance behind the panel for lamp insertion/removal. The lampholder should be specified for the T-1 3/4 envelope diameter (~5.8 mm) and E5 thread (~5 mm diameter). Solder or crimp the lampholder leads before inserting the lamp, and ensure the lampholder body is mechanically retained against vibration - push-fit retention alone is rarely adequate for industrial or aviation applications.
Although incandescent lamps do not produce switching EMI like LEDs or DC-DC converters, the 220 mA filament current can inject 50/60 Hz common-mode noise into nearby analog signal traces if the return path is not properly star-grounded. Route the lamp supply on a separate ground return to the supply, and keep analog signal grounds isolated. This is especially important in medical and audio equipment where microvolt-level signals coexist with panel indicators.
규정 준수 정보
RoHS compliant under Exemption 6c (lead in glass envelope of incandescent lamps). Lead-free = no because the glass envelope contains lead per exemption 6c. AEC-Q100 not applicable - this is a lamp, not a semiconductor.
