A1391SEHLT-T - Micropower Linear Hall Effect Sensor | Allegro
部品番号: A1391SEHLT-T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.35 | $135.00 |
| 500 | $1.12 | $560.00 |
| 1,000 | $0.95 | $950.00 |
| 3,000 | $0.78 | $2,340.00 |
A1391SEHLT-T 概要
A linear Hall effect sensor is a type of magnetic position sensor that converts the flux density of an applied magnetic field into a proportional analog voltage. Hall-effect sensors belong to the broader category of magnetic sensors, which sit within the transducer family alongside temperature, pressure, and current sensors. The Act as contactless replacements for mechanical potentiometers and reed switches, delivering higher reliability, finer resolution, and immunity to mechanical wear.
Key features of the A1391SEHLT-T include 3.1 V minimum supply voltage, micropower consumption for battery-operated designs, integrated temperature compensation circuitry that reduces the intrinsic sensitivity drift of the Hall element, and a low-noise small-signal high-gain amplifier on the same BiCMOS die. The device also offers a tri-state (high-impedance) output for wire-ORed multiplexed ADC sampling, plus an enable/sleep pin for power gating in duty-cycled systems.
The BiCMOS monolithic architecture integrates the Hall element, chopper-stabilized amplifier, and temperature-compensation network on a single die, achieving low offset, low noise, and a stable quiescent output voltage (VREF) at zero field. The user-selectable sleep mode enables system designers to drop quiescent current during idle windows, an absolute measure in efficiency-critical designs.
Typical applications include cellular phones, digital still cameras, portable tools, white-goods position feedback, and battery-operated consumer electronics where contactless rotary or linear position sensing is required. The wide supply range down to 3 V and microamp-level sleep current suit coin-cell and lithium-polymer powered products.
When designing with this device, place a 1 nF to 100 nF bypass capacitor close to the supply pin and keep the high-current switching traces away from the Hall element to avoid magnetic and electrical crosstalk. Verify the magnetic circuit produces the rated field range at the IC location; the A1391SEHLT-T is sensitive to stray fields from nearby motors or inductors.
This page synthesizes Allegro datasheet specifications, distributor stock and pricing, same-family drop-in alternatives (A1392/A1393/A1395 in identical DFN-6), and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: A1391SEHLT-T — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
A1392SEHLT-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
A1393SEHLT-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
A1395SEHLT-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
A1391SEHLT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
A1391SEHLX-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
A1391SEHLT-T 最大定格＆電気的特性
| センサタイプ | Linear Hall Effect Sensor (single axis) |
| Family | A139x (A1391 / A1392 / A1393 / A1395) |
| 出力タイプ | Analog voltage (tri-state capable) |
| Typical Sensitivity | 2.5 mV/G |
| Supply Voltage Range | 3.1 V to 6.5 V |
| 動作温度 | -20C to +85C |
| パッケージ | 6-pin MLP/DFN (2 x 3 mm), 0.75 mm height |
| 実装タイプ | Surface Mount |
| Lead Finish | Lead-free (Matte Tin) |
| MSLレベル | MSL 1 |
| RoHS ステータス | Compliant |
| Process Technology | BiCMOS monolithic |
| Tri-State Output | Yes (high-impedance sleep state) |
| Sleep Mode | User-selectable via SLEEP pin |
A1391SEHLT-T ピン構成
| ピン 1 | VCC — Supply voltage (3.1 V to 6.5 V) |
| ピン 2 | VOUT — Analog output voltage proportional to applied magnetic field (tri-state capable) |
| ピン 3 | GND — Ground reference |
| ピン 4 | NC — Not connected (per datasheet) |
| ピン 5 | SLEEP — Sleep-mode control input (active-low places device in high-impedance output / sleep state) |
| ピン 6 | NC — Not connected (per datasheet) |
主な用途
A1391SEHLT-T の用途: 6 件s: Cellular Phone Slide / Position Sensing, Digital Still Camera Lens Position Feedback, Portable Cordless Power Tool Trigger Sensing, White Goods / Appliance Knob Position Sensing, Battery-Operated Consumer Position Sensing, Security / Door Position Sensing.
Cellular Phone Slide / Position Sensing
The A1391SEHLT-T's micropower active current and 3.1 V minimum supply make it ideal for cellular phone slide, clamshell, and rotary-knob position feedback, where a small rare-earth magnet on the moving element and the A1391SEHLT-T on the fixed chassis generate an analog voltage proportional to slider position. With 2.5 mV/G typical sensitivity and a 6-pin MLP/DFN (2 x 3 mm) package, it fits behind the display panel. The tri-state output and user-selectable sleep pin let the phone's MCU duty-cycle the sensor, dropping average current to microamp levels during inactivity, an essential measure for talk-time and standby-time budgets on lithium-ion powered handsets.
おすすめ
Digital Still Camera Lens Position Feedback
In digital-still-camera lens barrels, the A1391SEHLT-T provides contactless linear feedback of focus or zoom ring rotation, replacing mechanical potentiometers that wear out under repeated use. Its BiCMOS chopper-stabilized front-end and integrated temperature compensation keep the output stable across the -20C to +85C operating range, which matches typical consumer-camera thermal environments. With 2.5 mV/G sensitivity and a 1.4 mm-thin DFN-6 footprint, the IC fits inside narrow IDCs and tracks assembly.
おすすめ
Portable Cordless Power Tool Trigger Sensing
The A1391SEHLT-T is well-suited for trigger-position detection in portable cordless power tools, where its 3 V low-voltage operation directly accepts a single-cell Li-ion or Li-polymer battery rail without additional regulation. Its micropower quiescent current and user-selectable sleep mode minimize standby drain during tool inactivity, while the analog ratiometric output provides smooth, contactless trigger-position information to the motor-control MCU. The 6-pin MLP/DFN (2 x 3 mm) package withstands the high-vibration, high-temperature environment inside a tool handle.
おすすめ
White Goods / Appliance Knob Position Sensing
The A1391SEHLT-T provides contactless rotation feedback on washing-machine, dishwasher, and oven selector knobs, replacing mechanical encoders that wear out and accumulate contamination. Its Hall-based sensing is sealed, magnetically immune to moisture, and operates from a 3.1 V to 6.5 V supply that can be derived directly from the appliance's 5 V standby rail. The 2.5 mV/G typical sensitivity yields fine angular resolution when paired with a diametrically-magnetized disk magnet on the knob shaft.
おすすめ
Battery-Operated Consumer Position Sensing
The A1391SEHLT-T is engineered for battery-operated consumer products where the SLEEP pin enables aggressive power-gating to extend battery life, reducing average current draw during idle intervals to the single-microamp range. Its 6-pin MLP/DFN (2 x 3 mm, 0.75 mm) leadless package fits inside slim-form-factor enclosures typical of portable IoT and consumer devices. With an operating temperature range of -20C to +85C and lead-free matte-tin finish, it survives hand-held and wearable thermal and reflow stress.
おすすめ
Security / Door Position Sensing
The A1391SEHLT-T serves as a contactless door / window position sensor in security systems, where its low quiescent current and user-selectable sleep mode allow years of operation from a coin-cell battery. A magnet on the door and the A1391SEHLT-T on the frame produce a binary open/closed indication via the analog output threshold. The DFN-6 (2 x 3 mm) package installs inside narrow frame channels with no mechanical protrusion.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: A1391SEHLT-T — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | A1392SEHLT-T | A1393SEHLT-T | A1395SEHLT-T | A1391SEHLT |
|---|---|---|---|---|---|
| Package | 6-MLP/DFN (2x3 mm) | 6-MLP/DFN (2x3 mm) - same | 6-MLP/DFN (2x3 mm) - same | 6-MLP/DFN (2x3 mm) - same | 6-MLP/DFN (2x3 mm) - same |
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Supply Voltage Range | 3.1 V to 6.5 V | 3.1 V to 6.5 V | 3.1 V to 6.5 V | 3.1 V to 6.5 V | 3.1 V to 6.5 V |
| Sleep Pin | Yes (user-selectable) | Yes | Yes | Yes | Yes (same die) |
| Tri-State Output | Yes | Yes | Yes | Yes | Yes (same die) |
| Operating Temperature | -20C to +85C | -20C to +85C | -20C to +85C | -20C to +85C | -20C to +85C |
| Mounting / Reel | Tape & Reel (-T) | Tape & Reel | Tape & Reel | Tape & Reel | Tube (non-reel) |
主な差別化要因
- User-selectable sleep mode with tri-state output （vs A1392SEHLT-T)
- Micropower 3 V operation - direct Li-ion compatibility （vs Honeywell SS49E)
- Smallest package in A139x family (DFN-6 2x3 mm) （vs A1395SEHLT-T)
設計ノート
The A1391SEHLT-T supports user-selectable sleep mode via the SLEEP pin; tie this pin HIGH through a 100 kohm pull-up to VCC for always-active operation, or drive it LOW from the host MCU to enter the high-impedance output / low-Icquiescent state. Decouple VCC with a 100 nF X7R ceramic capacitor placed within 2 mm of the supply pin to suppress switching-noise injection into the chopper-stabilized Hall front-end. Estimated: with a 100 kohm pull-up and SLEEP toggled at 1 Hz with 10 ms active windows, average current is dominated by the active-mode ICC figure (refer to the A139x datasheet for the exact number).
Keep the A1391SEHLT-T's Hall element at least 5 mm away from any switching power inductors, motor windings, or current-carrying traces carrying more than ~100 mA to avoid stray-field interference that can corrupt the analog output. Use a 4-layer PCB with a dedicated ground plane beneath the IC, and route the VOUT trace as a differential-style guarded trace with ground on adjacent layers to minimize capacitive coupling from high-impedance analog output to the A208 and the host MCU's ADC inputs. Do not route high-frequency switching signals under the PCB.
The SLEEP pin is a logic-level input - do not leave it floating; an undriven SLEEP pin can drift into the linear region and cause undefined output behavior. Confirm that the magnet orientation and air gap match the sensitivity grade of the device in use; selecting the wrong A139x sensitivity variant for the available magnetic circuit will produce an output that saturates against the rails or remains near VREF. The 6-MLP/DFN package has an exposed thermal pad - while the A1391SEHLT-T is thermally low-power, do not allow the pad to float; tie it to GND for mechanical stability and to provide a low-impedance ground reference for the chopper-stabilized front-end.
コンプライアンス情報
RoHS compliant and lead-free per Allegro product marking and findic.us datasheet excerpt. Not qualified for automotive AEC-Q100 - select a different part for automotive applications.
