INA139NA/3K-Q1 - High-Side Current Shunt Monitor 40V SOT-23-5 | TI
N.º de pieza: INA139NA/3K-Q1 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.45 | $0,45 |
| 10 | $0.41 | $4,10 |
| 100 | $0.36 | $36,00 |
| 500 | $0.33 | $165,00 |
| 1.000 | $0.3 | $300,00 |
| 3.000 | $0.28 | $840,00 |
INA139NA/3K-Q1 Descripción general
A current shunt monitor, also called a current sense amplifier, is a specialized instrumentation amplifier that measures the voltage drop across a shunt resistor placed in series with a load, typically on the high side of the supply rail. Unlike general-purpose op amps, current shunt monitors tolerate large input common-mode voltages far above their own supply pin, making them the standard building block within the power management and current sensing hierarchy of modern electronic systems.
Key features include a wide 2.7V to 40V common-mode range, a 440kHz bandwidth for fast transient monitoring, ultra-low 60uA typical quiescent current, single-resistor gain setting, and a complete unipolar high-side measurement circuit requiring no external amplifier. The output is a current signal converted to voltage by a single external resistor (RL), allowing easy gain scaling from 1 V/V up to over 100 V/V.
The INA139 architecture uses an internal op amp driving an output transistor that mirrors shunt current through RL, producing VOUT = IS x RL where IS is proportional to the shunt drop. This two-resistor gain configuration (shunt + RL) gives designers direct control of transimpedance gain without precision resistor networks.
Typical applications include battery chargers, automotive power monitoring, server and telecom DC power supplies, overcurrent protection circuits, and portable equipment current telemetry, where the tiny SOT-23-5 footprint and 60uA consumption minimize board area and drain.
Design tip: set gain so the maximum expected shunt voltage (typically 50-100mV) maps to the ADC input range, and keep RL under about 10k ohms to preserve bandwidth and output drive.
Alternativas directas para INA139NA/3K-Q1 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con INA139NA/3K-Q1 (mismo factor de forma y huella) — difiere en Gain Setting, Output Type, Package, Quiescent Current, Operating Temperature Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
INA169NA/3K
✅ Sustitución directa✓ En stock
$0.32 / unidad
Ver hoja de datos →INA139NA/250
✅ Sustitución directa✓ En stock
$0.55 / unidad
Ver hoja de datos →INA139AQDBVRQ1
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
INA138NA/3K
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
INA168NA/3K
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
INA139NA/3K-Q1 Especificaciones
| Función | High-Side Current Shunt Monitor |
| Input Common-Mode Voltage Range | 2.7 V to 40 V |
| Supply Voltage Range | 2.7 V to 40 V |
| Bandwidth | 440 kHz |
| Corriente en reposo | 60 uA (typ) |
| Tipo de salida | Current output, converted to voltage via external resistor RL |
| Gain Setting | Single external resistor (transimpedance via RL) |
| Measurement Type | Unipolar, high-side |
| Supply and Common-Mode Independence | Yes, independent voltages |
| Rango de temperatura de funcionamiento | -40C to +125C |
| Encapsulado | SOT-23 (DBV), 5 pins |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Packaging | Tape and Reel (/3K, 3000 units) |
Configuración de pines de INA139NA/3K-Q1
| Pin 1 | OUT — Current output; connect resistor RL to ground to convert output current to voltage |
| Pin 2 | GND — Ground reference |
| Pin 3 | IN- — Inverting input; connect to load side of shunt resistor |
| Pin 4 | IN+ — Non-inverting input; connect to supply side of shunt resistor |
| Pin 5 | V+ — Power supply, 2.7V to 40V, independent of common-mode voltage |
Aplicaciones típicas
INA139NA/3K-Q1 es adecuado para 6 aplicacións: Battery Charger Current Monitoring, Automotive Power Rail Monitoring, Server and Telecom DC Power Supplies, Overcurrent Protection and Fault Detection, Portable and Wearable Device Current Telemetry, Industrial 24V Control Panel Monitoring.
Battery Charger Current Monitoring
The INA139's 60uA quiescent current and 2.7V-40V common-mode range make it ideal for high-side charge-current sensing in 1S-10S lithium battery systems. Placed above the shunt on the charger input, its 440kHz bandwidth captures switching-ripple and transient charge currents, while the current-output architecture lets RL scale the signal directly into a charger MCU ADC range without a separate amplifier stage.
Recomendado
Automotive Power Rail Monitoring
In 12V and 24V automotive buses, the INA139 monitors high-side load current for body control modules, infotainment, and e-call systems. The -40C to +125C temperature rating covers under-hood and passenger-compartment zones, and the 40V common-mode ceiling tolerates load-dump clamped transients on clamped rails. Its 60uA draw minimizes quiescent drain - critical for always-connected battery-current telemetry in vehicles parked for extended periods.
Recomendado
Server and Telecom DC Power Supplies
Telecom -48V-derived and server 12V distribution rails need continuous current telemetry for power budgeting and fault detection. The INA139 measures shunt drop on the high side of these rails with its supply pin powered independently from a local 3.3V or 5V rail - a direct use of its independent supply/common-mode feature. The 440kHz bandwidth supports fast overcurrent comparator loops protecting hot-swap paths and DC-DC front ends.
Recomendado
Overcurrent Protection and Fault Detection
Because the INA139 responds within microseconds across a 440kHz band, its output can drive a comparator directly for hardware overcurrent latching - faster than polled digital monitors. A shunt of 10-50mOhm and RL scaled for the comparator threshold create a simple, two-resistor protection circuit for motor drives, LED strings, and USB port protection, with the SOT-23-5 footprint occupying minimal board area near the protection point.
Recomendado
Portable and Wearable Device Current Telemetry
In battery-powered portable devices, the INA139's 60uA consumption and 2.7V minimum supply let it monitor load current even during low-battery conditions. Engineers use the ground-referenced output to feed power-management ICs or fuel-gauge MCUs, profiling system sleep versus active current. The tiny SOT-23-5 package fits wearable and IoT PCBs where every square millimeter and every microamp of monitor overhead matters to runtime.
Recomendado
Industrial 24V Control Panel Monitoring
Industrial PLC and control panels running 24V (nominal, up to 40V worst case) benefit from the INA139's common-mode ceiling for load-current supervision of actuators, solenoids, and sensor clusters. The analog output integrates easily with isolation amplifiers or ADC front ends, and the wide -40C to +125C range suits sealed cabinets without forced cooling. Single-resistor gain setting simplifies BOM standardization across multiple panel variants.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para INA139NA/3K-Q1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | INA169NA/3K | INA139NA/250 | INA139AQDBVRQ1 |
|---|---|---|---|---|
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Common-Mode Voltage Range | 2.7V to 40V | 2.7V to 60V | 2.7V to 40V | 2.7V to 40V |
| Output Type | Current output (via RL) | Current output (via RL) | Current output (via RL) | Current output (via RL) |
| Temperature Range | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Automotive Grade | AEC-Q1 suffix (verify Q1 documentation) | No (standard grade) | No (standard grade) | Yes (AEC-Q100, A-grade) |
| Reel Quantity | 3000 | 3000 | 250 | 3000 |
Diferenciadores clave
- Lowest-cost option within the TI current monitor family (frente a INA240A1QPWRQ1)
- 40V common-mode headroom for 24V industrial rails (frente a INA139NA/250)
- 60V upgrade path without redesign (frente a INA169NA/3K)
Notas de diseño
Use Kelvin (4-wire) connections at the shunt resistor: route the IN+ and IN- traces directly from the shunt pads, not from shared power copper, or shunt trace resistance adds gain error. Keep the shunt drop in the 50-100mV range at full load to balance accuracy against power loss. Place the INA139 within a few millimeters of the shunt to minimize differential noise pickup on the high-impedance inputs.
The output is a current source into RL; choose RL so that VOUT = IS(max) x RL stays within the linear range (below roughly V+ - 1V, and within the ADC input range). Excessively large RL (above about 10k) reduces bandwidth and output compliance. Add a small capacitor across RL (100pF-1nF) to filter noise when feeding an ADC, accepting a bandwidth trade-off per the datasheet bandwidth equation.
The INA139 is unipolar: it cannot measure reverse (discharge vs charge direction) current - the output saturates at ground. If bidirectional sensing is needed, use INA240 or INA219 instead. Also remember common-mode and supply are independent but each must stay within 2.7V-40V; powering V+ below the shunt-side rail is allowed but do not let IN+/IN- fall below 2.7V during startup sequencing.
Información de cumplimiento
RoHS compliance and lead-free status per TI product page for INA139NA/3K. The -Q1 suffix in the target MPN suggests automotive intent, but AEC-Q100 qualification was not confirmed in the provided web data - the verified TI page lists standard INA139NA/3K; verify Q1 documentation or use INA139AQDBVRQ1 for confirmed AEC-Q100.
