My Inquiry
My Account
Diodes Incorporated AH374-SA-7
- Part No.:
- AH374-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH374-SA-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,548
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AH374-SA-7 from Diodes Incorporated is a bipolar Hall-effect latched sensor in SOT23 package, designed for electronic commutation in brushless DC motors and speed sensing. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical operate/release points, and functions across –40°C to +125°C.
For engineers reviewing the AH374-SA-7 datasheet, AH374-SA-7 pinout, AH374-SA-7 application, or AH374-SA-7 equivalent, this page provides verified magnetic thresholds, open-drain output behavior, thermal derating curves, package-specific marking codes (YJ), and direct replacement guidance versus AH3774.
Technical Context
The AH374-SA-7 integrates a Hall plate, chopper-stabilized amplifier, Schmitt trigger with hysteresis (60G typical), and band-gap-regulated internal supply. Its latch operation requires magnetic polarity reversal-South pole activates output (low), North pole releases it.
It uses an open-drain output stage capable of sinking 25mA at VOUT ≤ 400mV (IOUT = 20mA), with supply current under 4mA at 12V. Magnetic sensitivity is specified across 2.5V–20V supply and remains stable over –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 20V - Enables direct use with 3.3V, 5V, 12V, and 24V motor control rails without external regulation. |
| Output Type | Open-drain - Requires external pull-up; supports wired-OR logic and level translation up to 28V transient. |
| Output Sink Current | 25mA - Directly drives small relays, LEDs, or logic inputs without buffer transistors. |
| Operate Point (BOP) | 5–60G (typ. 30G) - Detects weak magnetic fields from small ferrite or NdFeB magnets at air gaps up to 2mm. |
| Release Point (BRP) | –60 to –5G (typ. –30G) - Provides 60G hysteresis to reject mechanical vibration and EMI-induced false triggers. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive BLDC fans and industrial motor controllers. |
| Power Dissipation (SOT23) | 230mW @ 25°C, derates to 0mW at 150°C - Limits continuous sink current to ~18mA at 105°C ambient. |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 2.4mm × 1.3mm footprint, gull-wing leads, YJ top-side marking. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 2.2–20V; internal band-gap regulator stabilizes bias for Hall plate and comparator across voltage/temp variation. |
| 2 (GND) | Reference ground | Common return for supply and output; must be low-impedance path to minimize noise coupling into Hall sensing node. |
| 3 (OUT) | Open-drain output | Sinks up to 25mA when active; requires external pull-up (10kΩ–100kΩ) to define logic-high level and improve noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires opposite-polarity magnetic field to toggle state - eliminates need for external timing or debouncing circuitry in rotor position detection. |
| Wide supply range (2.2–20V) | Eliminates dedicated LDO for sensor bias in multi-rail systems - simplifies power architecture in BLDC inverters and fan modules. |
| 25mA output sink capability | Directly interfaces with standard microcontroller GPIOs (configured as input with pull-up) or drives indicator LEDs without added components. |
| 60G magnetic hysteresis | Rejects bounce from mechanical vibration in rotating assemblies - ensures single, clean edge per magnet passage in RPM counting applications. |
| –40°C to +125°C operation | Validated for placement near motor windings or in engine compartments - no derating required up to 125°C ambient. |
Applications
| BLDC Motor Commutation | Brushless Fan Control |
|---|---|
|
Use Scenario: Rotor position feedback for 3-phase inverter gate timing in 24V DC fans used in telecom power supplies. IC Role / Device Role / Timing Role: Hall latch providing synchronized edge-triggered signals to MCU timer capture inputs for precise 120° electrical phase alignment. Use Value: Enables sensor-based trapezoidal commutation with <1° electrical angle jitter, supporting >30,000 RPM operation at full load. |
Use Scenario: Speed monitoring and closed-loop RPM control in automotive HVAC blower modules. IC Role / Device Role / Timing Role: Magnetic revolution counter feeding pulse-width modulated (PWM) fan drive via microcontroller interrupt service routine. Use Value: Delivers repeatable 1% speed accuracy across temperature, enabling ASHRAE-compliant airflow regulation without calibration. |
| Rotational Speed Measurement | Position Detection in Actuators |
|
Use Scenario: Tachometer signal generation for industrial pump motors operating in dusty, high-vibration environments. IC Role / Device Role / Timing Role: Edge-detecting latch converting gear tooth passage into clean digital pulses for frequency-to-voltage conversion. Use Value: 60G hysteresis prevents double-counting during mechanical resonance; supports reliable measurement down to 10 RPM. |
Use Scenario: End-of-travel detection in linear solenoid actuators used in fuel injector test benches. IC Role / Device Role / Timing Role: Proximity switch confirming plunger extension/retraction using embedded permanent magnet on moving armature. Use Value: Bipolar latch holds state through brief magnetic field dropouts during actuator acceleration/deceleration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3774 | Successor part; identical pinout, same BOP/BRP specs, improved ESD rating (±4kV HBM vs. ±2kV), lower IDD (1.5mA typ. vs. 2mA). | Drop-in replacement for new designs; supports higher reliability in automated assembly lines with static-prone handling. | Select AH3774 for production ramp; AH374-SA-7 remains viable for legacy BOM continuity where obsolescence risk is managed. |
| AL374Q | AEC-Q100 Grade 1 qualified (–40°C to +125°C), same magnetic specs, but rated for 30mA sink and includes reverse-polarity protection. | Required for automotive powertrain or chassis applications needing PPAP documentation and IATF 16949 traceability. | Choose AL374Q only when AEC-Q100 compliance is contractually mandated; otherwise AH374-SA-7 offers cost advantage for industrial use. |
Compared with AH3774 and AL374Q, the AH374-SA-7 provides identical functional performance in non-automotive contexts but lacks enhanced ESD robustness and formal automotive qualification-making it optimal for cost-sensitive industrial motor control where legacy design validation exists.
Availability
AH374-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, rotational speed measurement, and position detection applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for AH374-SA-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.
The AH374 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust rotor position sensing and speed feedback in cost-constrained, high-volume motor control systems.
FAQ
Is AH374-SA-7 still in production?
No-AH374-SA-7 is officially obsolete per Diodes' DS39163 Rev. 4 (May 2023). It remains available through Aetrix Electronics' legacy inventory and authorized franchised stock, with full traceability and date-code visibility. New designs should migrate to AH3774.
What is the correct pull-up resistor value for AH374-SA-7's open-drain output?
Diodes recommends 10kΩ to 100kΩ. A 10kΩ pull-up to 12V yields ~1.2mA quiescent current and fast rise time (<100ns); 47kΩ balances speed and power in battery-powered fans. Values below 4.7kΩ risk exceeding 25mA sink limit during output low.
How does magnetic orientation affect AH374-SA-7 activation in SOT23 package?
For AH374-SA-7 (SOT23), the South pole must approach the part-marking side to activate output. The device detects field perpendicular to the package surface; mounting orientation must align magnet polarity with the die's sensitive axis shown in the functional block diagram.
Can AH374-SA-7 operate reliably at 2.2V supply?
Yes-it switches output above 2.2V, but magnetic characteristics (BOP/BRP) stabilize only above 2.5V. For accurate commutation timing, maintain VDD ≥ 2.5V; 2.2V is valid only for basic presence detection where threshold tolerance is acceptable.
AH374-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 5mT Trip, -5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH374-SA-7 FAQ
1.How can I place an order for AH374-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH374-SA-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AH374-SA-7 reliable?
The price and inventory of AH374-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH374-SA-7 is usually 5 days.
3.What payment methods are accepted for AH374-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH374-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH374-SA-7?
AH374-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH374-SA-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AH374-SA-7?
For technical support, including AH374-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH374-SA-7 requirements.
6.How does Aetrix verify that AH374-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH374-SA-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH374-SA-7 meets industry standards.
7.What is the process for return or replacement of AH374-SA-7?
All AH374-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH374-SA-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AH374-SA-7 part is unused and in its original packaging.
Return procedure for AH374-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AH374-SA-7 Tags
-
TCS40DLR,LF
Toshiba Semiconductor and Storage
-
DRV5032FBDBZR
Texas Instruments
-
DRV5032FADBZR
Texas Instruments
-
AH1912-FA-7
Diodes Incorporated
-
AH1913-W-7
Diodes Incorporated
-
AH1911-W-7
Diodes Incorporated
-
TLI49631MXTSA1
Infineon Technologies
-
SM453R
Honeywell Sensing and Productivity Solutions
-
MLX90248ESE-EBA-000-RE
Melexis Technologies NV
-
MLX92213ELD-AAA-000-RE
Melexis Technologies NV
-
TLE4913HTSA1
Infineon Technologies
-
US5781ESE-AAA-000-RE
Melexis Technologies NV
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
