My Inquiry
My Account
Diodes Incorporated AH3774-SA-7
- Part No.:
- AH3774-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3774-SA-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,618
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AH3774-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall-effect latch IC designed for brushless DC motor commutation and position sensing in industrial and consumer appliances. It operates from 3.0V to 28V, features ±40G typical operate/release points (Bop/Brp), delivers 60mA continuous output current, and uses chopper-stabilized architecture for thermal stability across –40°C to +125°C.
For engineers reviewing the AH3774-SA-7 datasheet, AH3774-SA-7 pinout, AH3774-SA-7 application, or AH3774-SA-7 equivalent, this device supports robust magnetic sensing in high-noise, wide-voltage environments - especially where reverse-battery protection, open-drain switching, and precise latching polarity are required.
Technical Context
The AH3774-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation and an internal bandgap regulator, enabling stable operation over temperature and supply voltage. Its bipolar latch behavior requires South Pole activation (to part marking side) and North Pole deactivation, with hysteresis of 80G typical.
It integrates reverse-blocking diode and Zener clamp on VDD, plus output overcurrent limiting (30–55mA) and ESD protection (6kV HBM). The single open-drain output switches low when B > Bop (+40G typ.) and remains latched until B reverses below Brp (–40G typ.), with 10µs startup time and 800kHz chopping frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct connection to 12V/24V industrial rails without external regulation. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and motor-control environments. |
| Bipolar Switch Points | Bop = +40G, Brp = –40G (typ.) - enables reliable latching with strong hysteresis (80G) against noise-induced toggling. |
| Output Type | Open-drain, 60mA continuous - compatible with standard pull-up resistors and logic-level interfacing. |
| Startup Time | 10µs (typ.) - ensures rapid system readiness after power-on at ≥3V. |
| Chopping Frequency | 800kHz - suppresses low-frequency drift and enhances immunity to mechanical stress and thermal gradients. |
| ESD Rating | 6kV HBM - meets IEC 61000-4-2 level for handling and board-level robustness. |
Pinout & Package
Package: SOT23 (3-pin, surface-mount, JEDEC TO-236AB compliant). Dimensions: 2.4mm × 1.3mm × 1.0mm (L×W×H); thermal resistance θJA ≈ 220°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 3.0–28V; includes integrated reverse-blocking diode and 28V Zener clamp for fault tolerance. |
| 2 - GND | Ground reference | Common return for internal regulator, Hall element, and output stage; must be low-impedance for noise immunity. |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA; requires external pull-up; switches low when South Pole field exceeds Bop (+40G). |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces offset drift to <±0.1mV/°C, enabling stable switching thresholds across full temperature range. |
| Integrated supply protection | Reverse-blocking diode + 28V Zener clamp prevents damage during battery reversal or load-dump transients. |
| High magnetic sensitivity | ±40G operate/release points allow use with low-strength magnets or increased air gaps in motor rotor sensing. |
| Robust output stage | 60mA continuous sink current with internal current limit protects against short-circuit and capacitive loading. |
| RF noise immunity | Validated per IEC 61000-4-3 (10V/m, 80MHz–1GHz) - maintains latching integrity in noisy motor-drive environments. |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor pole position in 3-phase BLDC fans and pumps used in HVAC and white goods. IC Role / Device Role / Timing Role: Bipolar latch providing synchronized commutation signals to gate driver ICs via open-drain outputs. Use Value: Enables precise 6-step commutation without external signal conditioning; ±40G sensitivity accommodates magnet aging and mechanical tolerance. |
Use Scenario: Counting gear teeth or rotating shaft pulses in smart meters and flow sensors. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean digital pulses for microcontroller timer capture. Use Value: 10µs startup and 3.75µs propagation delay ensure accurate high-speed RPM calculation up to 100k RPM. |
| Linear Position Sensing | Contactless Angular Indexing |
|
Use Scenario: Monitoring slide rail or valve stem position in kitchen appliances and robotic vacuum cleaners. IC Role / Device Role / Timing Role: Latching Hall switch detecting discrete linear travel endpoints with hysteresis-based bounce suppression. Use Value: 80G hysteresis eliminates false triggers from vibration; 28V operation allows direct integration into 24V control subsystems. |
Use Scenario: Detecting angular index marks on rotating dials in coffee machines and washing machine control panels. IC Role / Device Role / Timing Role: South/North polarity-sensitive latch identifying home position or mode-selection detents. Use Value: Polarity-specific activation (South-to-marking-side) prevents misalignment errors during assembly and field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724-SA-7 | Successor device with identical pinout, same 3–28V range, but improved Bop/Brp tolerance (±35G min) and lower IDD (2.5mA typ. vs. 3mA). | Designed for new designs requiring extended lifecycle support; AH3774 is not recommended for new designs. | Select AH3724-SA-7 for all new projects; AH3774-SA-7 remains viable for legacy BOM continuity and drop-in replacement. |
| US1881LUA-AAA-000 | Lower voltage range (2.5–24V), ±30G Bop/Brp, no reverse-battery protection, 50mA output current. | Lacks integrated Zener clamp and reverse diode; requires external protection circuitry in automotive or industrial 24V systems. | Use only where cost sensitivity outweighs protection requirements and supply voltage stays ≤24V with stable polarity. |
Compared with AH3774-SA-7, AH3724-SA-7 offers tighter magnetic specs and longer-term availability, while US1881LUA-AAA-000 sacrifices protection and sensitivity for lower unit cost - making AH3774-SA-7 the optimal choice for ruggedized 24V appliance motor control where reliability is prioritized over minimal BOM cost.
Availability
AH3774-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and contactless position sensing requiring stable component supply across industrial, home appliance, and personal care product lifecycles.
Supply support for AH3774-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, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial and consumer markets.
The AH3774 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, wide-voltage magnetic position detection in cost-sensitive, high-volume motor and appliance applications.
FAQ
What is the magnetic polarity requirement for AH3774-SA-7 activation?
The AH3774-SA-7 (SOT23 package) requires the South Pole applied to the part marking side to turn the output ON; North Pole on the same side turns it OFF. This polarity behavior is fixed by die orientation and cannot be reversed via configuration. Confirm magnet placement using the top-view pin 1 indicator and package marking surface.
Does AH3774-SA-7 require an external capacitor on VDD?
Yes - a 10nF to 100nF ceramic decoupling capacitor (CIN) is required between VDD and GND, placed as close as possible to the pins. This stabilizes the internal bandgap regulator, improves noise immunity, and ensures reliable startup within the specified 10µs timing. Omitting CIN risks erratic switching or failure to latch.
Can AH3774-SA-7 drive a 10kΩ pull-up resistor directly?
Yes - with VDD = 12V and IOUT = 20mA, VOUT_ON is guaranteed ≤0.4V, yielding >1.16mA sink current into a 10kΩ pull-up. This provides sufficient noise margin for 3.3V or 5V logic interfaces. For faster rise times, reduce RL to 4.7kΩ or lower, ensuring total sink current stays within 60mA absolute max rating.
Is AH3774-SA-7 qualified for automotive applications?
No - AH3774-SA-7 is not AEC-Q100 qualified. While it operates from –40°C to +125°C and includes robust protections, Diodes explicitly states that automotive-grade versions require separate qualification (e.g., PPAP, IATF 16949 manufacturing). Use AH3724-QA-7 or AH3774-QA-7 variants if automotive compliance is mandatory.
AH3774-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:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 60mA
- 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
AH3774-SA-7 FAQ
1.How can I place an order for AH3774-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3774-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 AH3774-SA-7 reliable?
The price and inventory of AH3774-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 AH3774-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3774-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3774-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3774-SA-7?
AH3774-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3774-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 AH3774-SA-7?
For technical support, including AH3774-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3774-SA-7 requirements.
6.How does Aetrix verify that AH3774-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3774-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 AH3774-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3774-SA-7?
All AH3774-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3774-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 AH3774-SA-7 part is unused and in its original packaging.
Return procedure for AH3774-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AH3774-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…
