TLV431AE5TA - 1.24V Adj Shunt Reference ±1% | Diodes Inc
Артикул: TLV431AE5TA ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0.45 | $0,45 |
| 10 | $0.4 | $4,00 |
| 100 | $0.32 | $32,00 |
| 500 | $0.26 | $130,00 |
| 1.000 | $0.22 | $220,00 |
| 3.000 | $0.18 | $540,00 |
TLV431AE5TA Обзор
A shunt voltage reference is a three-terminal non-isolated regulator that maintains a fixed voltage between its reference and anode pins whenever the cathode-to-anode voltage exceeds the programmed output. It belongs to the broader family of voltage references (sub-category of power management ICs), which also includes series references, buried-zener references, and bandgap references. TLV-style parts sit at the low-voltage end, optimized for rails common in battery-powered and 3.3 V/5 V logic systems where classic 2.5 V/5 V TL431 references have insufficient headroom. The TLV431 is the lower-VREF counterpart to the TL431, sharing the same basic two-resistor feedback topology.
Key features include ±1% voltage tolerance at 25°C, ±2.0% accuracy over the entire industrial temperature range to 85°C, low cathode saturation voltage for efficient low-dropout operation, and low dynamic impedance. The TLV431A series is offered in several accuracy grades (A/B), while the TLV431E5 suffix in this part indicates the SC-74A / SOT-753 tape-and-reel packaging variant.
Architecturally the device uses a bandgap-style cell plus a feedback amplifier that compares the divided output against the internal 1.24 V reference, then modulates cathode current to hold the programmed node stable. Because it is a shunt part, the user must provide a series resistor from the supply, and the cathode current must remain above the regulator's minimum operating point across all load conditions.
Typical applications include secondary-side regulation in isolated switch-mode power supplies (as the error-amplifier reference), adjustable precision clamp circuits, low-voltage adjustable zener replacements, and portable/battery-powered equipment rails. It is also commonly used as a comparator with reference in battery chargers and monitors.
When designing, always size the series resistor so the cathode current stays above the minimum regulation point (typically ~80 µA for TLV431) but below the 15 mA absolute maximum; use 1% divider resistors to preserve VOUT accuracy, and bypass noisy nodes with a small capacitor if oscillation is observed.
This page synthesizes distributor pricing, drop-in alternates, and practical design notes not found in the manufacturer datasheet alone.
Аналоги без доработки для TLV431AE5TA — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с TLV431AE5TA (тот же форм-фактор и посадочное место) — отличается по Package, Reference Type.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
TLV431AILT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TLV431AINT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TLV431AINX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TL431ACDBVR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TL432BSA-7
✅ Прямая замена✓ В наличии
$0.11 / шт.
Открыть даташит →TLV431AE5TA Максимальные параметры и электрические характеристики
| Reference Type | Shunt, Adjustable |
| Output Voltage (Nominal) | 1.24 V |
| Диапазон выходного напряжения | 1.24 V to 18 V (programmable) |
| Initial Accuracy (TLV431A) | ±1% at 25°C |
| Accuracy Over Temperature | ±2.0% to 85°C industrial range |
| Maximum Cathode Voltage (VKA max) | 18 V |
| Maximum Cathode Current (IKA) | 15 mA (Diodes datasheet; up to 20 mA on Zetex datasheet) |
| Диапазон рабочих температур | -40°C to +85°C (industrial) |
| Корпус | SOT-25 (SC-74A, SOT-753) |
| Тип монтажа | Surface Mount |
| Количество выводов | 5 |
| Статус RoHS | Compliant |
| Lead-Free / Halogen-Free | Lead-free (per Diodes product page) |
| Datasheet Pages | 16 (Zetex / Diodes Inc. datasheet) |
Конфигурация выводов TLV431AE5TA
| Контакт 1 | REF — Reference input (connects to resistor divider) |
| Контакт 2 | A — Anode (ground reference) |
| Контакт 3 | NC — Not connected (per datasheet) |
| Контакт 4 | K — Cathode (VKA, regulated output / clamp) |
| Контакт 5 | A — Anode (ground reference, tied to pin 2) |
Типичное применение
TLV431AE5TA подходит для 6 применениеs: Secondary-Side SMPS Regulation, Portable / Battery-Powered Equipment, Adjustable Precision Zener Replacement, Comparator-With-Reference in Battery Chargers, Low-Voltage Reference for ADC/DAC Front Ends, Industrial Control Loop Setpoint.
Secondary-Side SMPS Regulation
The TLV431AE5TA's 1.24 V reference and 18 V maximum cathode voltage make it ideal for secondary-side regulation in isolated switch-mode power supplies (SMPS). Used as an error-amplifier reference in the optocoupler feedback path, it compares the divided output against VREF and drives the TL431-style feedback loop. With ±1% initial accuracy and ±2% industrial temperature drift, it supports 5 V/12 V rails typical of AC-DC adapters and DC-DC bricks.
Рекомендуется
Portable / Battery-Powered Equipment
The 1.24 V nominal reference of the TLV431AE5TA is well below the voltage of a single Li-ion cell (3.0-4.2 V), enabling sub-2.5 V rails from a single-cell battery. Used as a programmable low-voltage reference in portable medical, IoT sensor nodes, and wearable devices, it draws negligible cathode current at light loads. Its small SOT-25 footprint (2.9 mm x 1.6 mm) is suited for compact handheld enclosures where board area is constrained.
Рекомендуется
Adjustable Precision Zener Replacement
The TLV431AE5TA replaces legacy 1N47xx-series zener diodes in voltage-clamp and precision-shunt applications. Zeners drift considerably with current and temperature, while the TLV431AE5TA delivers a flat voltage-vs-current characteristic with ±1% initial accuracy. Used as a programmable sub-18 V clamp on RS-485 transceivers and op-amp supply pins, it provides quieter, more stable protection than a raw zener.
Рекомендуется
Comparator-With-Reference in Battery Chargers
In single- and multi-cell Li-ion charger circuits, the TLV431AE5TA acts as a low-cost precision comparator-with-reference, sensing battery voltage through a divider and driving a charge-enable transistor. With its 1.24 V reference point, designers can set any cell-voltage threshold from 3.0 V to 4.2 V by resistor selection. Its 15 mA cathode sink drives discrete MOSFET gates or BJT bases directly without an additional buffer stage.
Рекомендуется
Low-Voltage Reference for ADC/DAC Front Ends
Precision ADCs and DACs often require a sub-2.5 V reference that cannot be supplied by a TL431 (VREF 2.495 V). The TLV431AE5TA, programmed to 1.25 V or 2.048 V by two external resistors, supplies a quiet ratiometric reference for 16-bit SAR ADCs and audio DACs operating from 3.3 V rails. Its low dynamic impedance holds the reference stable during ADC conversion bursts.
Рекомендуется
Industrial Control Loop Setpoint
In 24 V industrial PLCs and process-control loops, the TLV431AE5TA supplies an adjustable precision reference for analog setpoint potentiometers, setpoint calibrators, and 4-20 mA loop excitation. Its 18 V max cathode voltage covers the 15 V regulated rail common in industrial sensors, while the 1.24 V baseline allows sub-5 V analog setpoints without resorting to a separate low-voltage reference.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для TLV431AE5TA — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | TLV431AILT | TLV431AINT | TLV431AINX | TL431ACDBVR | TL432BSA-7 |
|---|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Texas Instruments | Diodes Incorporated |
| Package | SOT-25 (SC-74A, SOT-753) - 5 pins | SOT-25 - same | SOT-25 - same | SOT-25 - same | SOT-23-5 - 5-pin SMD (footprint-compatible) | SOT-23-5 - 5-pin SMD (footprint-compatible) |
| Reference Voltage (VREF) | 1.24 V | 1.24 V | 1.24 V | 1.24 V | 2.495 V (rescale divider) | 1.24 V (typical TL432) |
| Initial Accuracy | ±1% (TLV431A grade) | ±1% (TLV431A grade) | ±1% (TLV431A grade) | ±1% (TLV431A grade) | ±1% (TL431A grade) | ±1% (TL432B grade) |
| Max Cathode Voltage (VKA) | 18 V | 18 V | 18 V | 18 V | 36 V | 18 V |
| Max Cathode Current | 15 mA | 15 mA | 15 mA | 15 mA | 100 mA | 100 mA |
| Operating Temperature | -40°C to +85°C (industrial) | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +125°C (automotive Q1) | -40°C to +125°C |
| Unit Price (qty 1, USD) | $0.45 | ~$0.45 (same die, packaging variant) | ~$0.45 (same die, packaging variant) | ~$0.45 (same die, packaging variant) | ~$0.18 (cross-brand reference) | ~$0.20 (same-brand TL432) |
Ключевые отличия
- Five-pin SOT-25 with explicit REF pin simplifies PCB layout (против TL431ACDBVR)
- 1.24 V VREF enables sub-2.5 V precision rails (против TL431ACDBVR)
- Diodes-sourced, broad secondary-market availability (против TLV431AILT)
Заметки по проектированию
Estimated: when designing with the TLV431AE5TA, the most common pitfall is letting the cathode current drop below the minimum regulation point (~80 µA for TLV431) at light load, which causes output voltage droop and oscillation. Size the series resistor RS so IKA(min) = (VIN - VOUT)/RS > 80 µA under maximum VOUT and minimum load, AND IKA(max) = (VIN - VOUT)/RS < 15 mA under minimum VOUT and full load. Always include a small (100 nF to 1 µF) capacitor on the cathode if the load is dynamic or the source is inductive.
Keep the TLV431AE5TA divider-resistor loop tight and short. Use 1% tolerance resistors for R1/R2 to preserve the ±1% reference accuracy. Place the TLV431AE5TA close to the load it regulates; long traces add inductance that can couple noise into the reference node. Use a ground plane under the device to keep thermal resistance low (SOT-25 has limited power dissipation - typically 250 mW at 25°C derating).
The TLV431AE5TA SOT-25 package has a typical power dissipation of 250 mW at 25°C, derated linearly to zero at +150°C. The dominant thermal source is the cathode current times VKA. Estimated: at VKA = 5 V and IKA = 10 mA, Pdiss = 50 mW; at VKA = 15 V and IKA = 15 mA, Pdiss = 225 mW - approaching the 250 mW limit. For continuous operation above 5 mA at high VKA, ensure adequate copper pour or use a larger DPAK reference part.
Информация о соответствии
RoHS compliant and lead-free per Diodes Incorporated product page. Halogen-free status not explicitly stated in the verified web data; consult the latest manufacturer datasheet revision. Not AEC-Q100 qualified - the TLV431 series is industrial-grade, not automotive-grade. Conflict-mineral compliance per Diodes Incorporated corporate policy.
