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Diodes Incorporated AH1894-Z-7
- Part No.:
- AH1894-Z-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-553
- Datasheet:
-
AH1894-Z-7.pdf
- Description:
- MAGNETIC SWITCH OMNIPOLAR SOT553
- Quantity:
- Payment:
- Shipping:
Inventory:2,989
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Product details
Overview
AH1894-Z-7 from Diodes Incorporated is a programmable, high-sensitivity, micropower omnipolar Hall-effect switch IC in SOT553 package, operating from 1.6V to 3.6V with average supply current of 8µW at 1.85V. It features user-selectable magnetic sensitivity bands via BSEL pin, chopper-stabilized architecture for thermal stability, and integrated pull-up/pull-down capability-designed for cover-detect and position-sensing in portable electronics.
For engineers reviewing the AH1894-Z-7 datasheet, AH1894-Z-7 pinout, AH1894-Z-7 application, or AH1894-Z-7 equivalent, this device supports low-power, space-constrained designs requiring flexible magnetic threshold selection without external components, stable operation across -40°C to +85°C, and robust ESD immunity (8kV HBM on VDD/GND/OUTPUT).
Technical Context
The AH1894-Z-7 implements a hibernating clocking system that alternates between ultra-low-power sleep mode (IDD(avg) = 4.3–13 µA) and brief awake periods (Tawake = 50–100 µs), enabling micropower operation. Its chopper-stabilized core delivers <±0.5 mT/°C switch-point drift and eliminates offset voltage drift over temperature and stress.
Omnipolar detection allows activation by either north or south magnetic pole; band selection (Low Band: ±15–45 G, High Band: ±25–55 G) is controlled by BSEL logic level (0–0.5 V for Low, 1.4–3.6 V for High), with internal 50 kΩ pull-down active only during awake time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6 V to 3.6 V - enables direct interface with Li-ion battery and 1.8/3.3 V logic rails without regulation |
| Average Supply Current | 4.3–13 µA at VDD = 1.85–3.6 V - supports multi-year battery life in always-on sensing applications |
| Magnetic Sensitivity (Low Band) | Bop = ±15–45 G, Brp = ±10–35 G - suitable for weak-field detection in thin-cover or low-magnet assemblies |
| Magnetic Sensitivity (High Band) | Bop = ±25–55 G, Brp = ±20–45 G - provides noise margin in high-interference or mechanically variable environments |
| Output Type | Open-drain, sink-only (VOL = 0.2 V @ 1 mA) - compatible with standard CMOS inputs and allows wired-OR configuration |
| ESD Rating | 8 kV HBM on VDD, GND, OUTPUT - ensures robustness during board handling and end-user assembly |
| Operating Temperature | -40°C to +85°C - validated for consumer and industrial portable equipment environments |
Pinout & Package
SOT553 package: 1.2 mm × 1.6 mm × 0.6 mm, 5-pin low-profile surface-mount housing with exposed thermal pad (not electrically connected); pin 2 is NC (no internal connection), allowing flexibility in PCB layout routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input - accepts 1.6–3.6 V; decoupling capacitor (100 nF recommended) required for noise immunity |
| 2 | NC | No internal connection - may be left floating or tied to GND for mechanical stability |
| 3 | BSEL | Band select control - logic-low (≤0.5 V) selects Low Band; logic-high (≥1.4 V) selects High Band; internal 50 kΩ pull-down active only during awake phase |
| 4 | GND | Ground reference - must be connected to system ground plane for stable switching thresholds and ESD path |
| 5 | OUTPUT | Open-drain output - sinks up to 3.5 mA; pulled low when B > Bop, released when B < Brp; requires external pull-up for high-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic detection | Responds to either N- or S-pole field - eliminates magnet orientation constraints in mechanical assembly |
| Programmable sensitivity bands | Two discrete Bop/Brp ranges selectable via single logic pin - enables firmware-driven calibration without hardware change |
| Chopper-stabilized architecture | Reduces thermal drift to <±0.5 mT/°C and offsets induced by mechanical stress - ensures consistent switch points after reflow and in dynamic enclosures |
| Integrated pull-down on BSEL | 50 kΩ internal resistor active only during awake time - guarantees default Low Band operation if BSEL is unconnected |
| No external pull-up required for basic operation | Internal pull-up/pull-down circuitry supports direct microcontroller GPIO interface - reduces BOM count and PCB area |
Applications
| Cellular Phone Cover Detect | Tablet Holster Switch |
|---|---|
Use Scenario: Detects flip cover open/close state in smartphones using a small embedded magnet and compact sensor placement near hinge. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing edge-triggered digital signal to baseband processor upon magnetic field crossing Bop/Brp thresholds. Use Value: Enables automatic screen on/off with <8 µW average power draw, extending standby battery life by >30% versus non-hibernating alternatives. | Use Scenario: Monitors attachment/detachment of protective holster on Android tablets, triggering sleep/wake transitions. IC Role / Device Role / Timing Role: Low-latency magnetic presence detector with configurable hysteresis (10–20 G) to reject mechanical vibration false triggers. Use Value: Supports dual-band sensitivity: Low Band for precise holster alignment detection; High Band for reliable release confirmation under varying gap tolerances. |
| Portable PC Display Lid Switch | Home Appliance Door Position Sensor |
Use Scenario: Integrated into clamshell laptop lid to signal display open/closed status to EC (Embedded Controller). IC Role / Device Role / Timing Role: Micropower Hall switch with 100 ms max output validity delay after BSEL change - accommodates firmware-controlled sensitivity adjustment during boot. Use Value: Eliminates need for mechanical microswitches, reducing assembly cost and failure rate while maintaining <0.2 V output low voltage for clean logic interfacing. | Use Scenario: Mounted inside refrigerator or washing machine door frame to detect closure for safety interlock and energy-saving mode activation. IC Role / Device Role / Timing Role: Industrial-grade Hall sensor with -40°C to +85°C rating and 8 kV HBM ESD protection - withstands condensation, vibration, and EMI in white-goods environments. Use Value: Delivers stable operation without recalibration across temperature swings and long-term exposure to magnetic fields from motors and compressors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar omnipolar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3320E-7 | Fixed sensitivity (no BSEL pin); 2.5–5.5 V supply; higher IDD(avg) = 25 µA | Lacks programmability - suited for cost-sensitive, single-threshold designs where field strength is tightly controlled | Select when BSEL flexibility is unnecessary and wider supply range is needed |
| TLE4913-2K | Unipolar operation only; 3.0–24 V supply; no hibernation mode; IDD(avg) = 1.8 mA | Requires stronger magnets and dedicated LDO - intended for automotive body electronics, not portable devices | Select only for 12 V systems with unipolar magnet geometry and no micropower requirement |
Compared with AL3320E-7 and TLE4913-2K, the AH1894-Z-7 uniquely combines programmable sensitivity, sub-10 µA average current, and 1.6–3.6 V operation - making it the only viable choice for battery-powered, space-constrained, dual-threshold position sensing.
Availability
AH1894-Z-7 is available at Aetrix Electronics and suitable for cellular phone cover detection, tablet holster sensing, portable PC lid switches, and home appliance door position monitoring requiring stable component supply, full RoHS compliance, and traceable sourcing.
Supply support for AH1894-Z-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, low-power, and miniaturized solutions for consumer, industrial, and computing markets.
The AH1894 belongs to Diodes' programmable Hall-effect switch product line, engineered specifically for ultra-low-power magnetic sensing in portable electronics where battery life, PCB area, and design flexibility are critical constraints.
FAQ
What is the function of the NC pin on the AH1894-Z-7?
Pin 2 is designated NC (No Connection) and has no internal electrical connection. It may be left unconnected or tied to GND for mechanical reinforcement during PCB assembly and reflow. Leaving it floating does not affect device functionality or magnetic performance.
How does the BSEL pin determine magnetic sensitivity bands?
BSEL selects between Low Band (Bop = ±15–45 G) and High Band (Bop = ±25–55 G). A voltage ≤0.5 V sets Low Band; ≥1.4 V sets High Band. An internal 50 kΩ pull-down ensures Low Band defaults when BSEL is unconnected or driven low during sleep phase.
Can the AH1894-Z-7 operate without an external decoupling capacitor?
No - a 100 nF ceramic capacitor between VDD and GND is required per datasheet Note 4. It stabilizes supply during wake cycles and enhances RF noise immunity. Omitting it risks erratic switching, increased jitter, and failure to meet specified IDD(avg) and ESD performance.
What is the maximum time for output validity after changing the BSEL state?
After BSEL logic level changes, output becomes valid after two complete operating phases - up to 200.1 ms maximum (typical 100 ms), depending on timing relative to the hibernation cycle. Firmware must wait for this stabilization before reading output state.
AH1894-Z-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-553
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- Programmable
- Test Condition:
- -
- Voltage - Supply:
- 1.6V ~ 3.6V
- Current - Supply (Max):
- 8µA
- Current - Output (Max):
- 3.5mA
- Output Type:
- Push-Pull
- Features:
- Programmable Trip Point
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-553
AH1894-Z-7 FAQ
1.How can I place an order for AH1894-Z-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1894-Z-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 AH1894-Z-7 reliable?
The price and inventory of AH1894-Z-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1894-Z-7 is usually 5 days.
3.What payment methods are accepted for AH1894-Z-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1894-Z-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1894-Z-7?
AH1894-Z-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1894-Z-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 AH1894-Z-7?
For technical support, including AH1894-Z-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1894-Z-7 requirements.
6.How does Aetrix verify that AH1894-Z-7 is sourced from the original manufacturer or authorized distributors?
All AH1894-Z-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 AH1894-Z-7 meets industry standards.
7.What is the process for return or replacement of AH1894-Z-7?
All AH1894-Z-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1894-Z-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 AH1894-Z-7 part is unused and in its original packaging.
Return procedure for AH1894-Z-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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