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Diodes Incorporated ZMY20TC
- Part No.:
- ZMY20TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Linear, Compass (ICs)
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZMY20TC.pdf
- Description:
- SENSOR MR ANALOG SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
ZMY20TC from Zetex Semiconductors is a magneto-resistive magnetic field sensor in SOT223 package, measuring Hy-field component with 4.7 mV/V sensitivity (typ), 1.7 kΩ bridge resistance (typ), and ±1.0 mV/V offset voltage (VB-referenced) for analog position and current sensing in automotive door switches and fluid metering impeller detection.
For engineers reviewing the ZMY20TC datasheet, ZMY20TC pinout, ZMY20TC application, or ZMY20TC equivalent, this page delivers verified electrical parameters, SOT223 terminal mapping, real-world use cases in proximity detection and scalar compassing, and validated alternative sensors with documented sensitivity and hysteresis differences.
Technical Context
The ZMY20TC implements a thin-film permalloy Wheatstone bridge structure where output voltage scales linearly with Hy (magnetic field perpendicular to chip edge), requiring a stabilizing Hx bias field of 3 kA/m applied externally via permanent magnet. Its operation is insensitive to vertical (Hz) fields.
It delivers DC–1 MHz bandwidth, operates from −40°C to +150°C, and exhibits −0.3 %/K temperature coefficient of sensitivity at constant VB=5 V, enabling stable analog output in harsh thermal environments without active compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bridge resistance | 1.7 kΩ typical - sets excitation current and power dissipation under 12 V supply |
| Open-circuit sensitivity | 4.7 (mV/V)/(kA/m) typical - defines analog output scaling for Hy-field measurement |
| Output voltage range | 20 mV/V typical - yields 100 mV full-scale at 5 V supply for ADC interface |
| Hysteresis | ≤50 µV/V at Hy = 2 kA/m - ensures repeatability in position-sensing applications |
| Offset voltage | ±1.0 mV/V - requires trimming or ratiometric ADC reference for sub-1% error |
| Operating frequency | DC to 1 MHz - supports high-speed rotation sensing in impeller-based flow meters |
| Temp. coeff. of sensitivity | −0.3 %/K at VB = 5 V - mandates calibration or compensation above 60°C ambient |
Pinout & Package
SOT223 package: 4-pin thermally enhanced surface-mount outline with exposed thermal pad; pin 1 = +VO, pin 2 = +VB, pin 3 = −VO, pin 4 = −VB (top view as marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VO | Positive bridge output | Differential output node referenced to +VB; connects to instrumentation amplifier input |
| +VB | Positive supply | Excitation voltage input (max 12 V); also serves as reference for ratiometric readout |
| −VO | Negative bridge output | Complementary differential output; enables noise rejection in twisted-pair routing |
| −VB | Negative supply / ground | Return path for bridge current; must be low-impedance to minimize common-mode error |
Key Features
| Feature | Design Value |
|---|---|
| Hy-field linearity | Output voltage strictly proportional to Hy component - enables calibrated scalar field measurement without angular alignment |
| Hx bias field tuning | Adjustable sensitivity and hysteresis suppression via external 3 kA/m Hx - eliminates need for on-chip trim circuitry |
| Zero Hz-field response | No output from magnetic fields perpendicular to chip plane - rejects interference from nearby solenoids or PCB traces |
| High-temperature operation | Functional from −40°C to +150°C - suitable for under-hood automotive and industrial motor control environments |
Applications
| Door Interlock Sensing | Fluid Flow Metering |
|---|---|
Use Scenario: Detecting closure state of industrial cabinet doors using embedded ferrous striker and fixed ZMY20TC. IC Role / Device Role / Timing Role: Analog magnetic field transducer converting proximity into ratiometric mV/V output. Use Value: Delivers 20 mV/V sensitivity and <50 µV/V hysteresis for reliable binary state discrimination without mechanical contact wear. | Use Scenario: Measuring rotational speed of plastic impeller in water meter by sensing passing magnet poles. IC Role / Device Role / Timing Role: High-bandwidth (1 MHz) analog field detector capturing impeller RPM as AC waveform amplitude. Use Value: Enables non-invasive, galvanically isolated flow rate calculation with DC–1 MHz response and ±1.0 mV/V offset stability. |
| Engine Crank Position | Traffic Vehicle Classification |
Use Scenario: Mounted near crankshaft gear to detect tooth passage timing for ignition control in 4-stroke ICE. IC Role / Device Role / Timing Role: Magnetic field amplitude sensor generating analog pulse train synchronized to gear rotation. Use Value: Provides deterministic zero-crossing detection with 4.7 (mV/V)/(kA/m) sensitivity and −0.3 %/K tempco for consistent timing across −40°C to +125°C. | Use Scenario: Embedded in road surface to classify vehicle type by detecting axle count and spacing via magnetic signature. IC Role / Device Role / Timing Role: Scalar compass-grade field sensor measuring static and quasi-static Hy variations from passing chassis. Use Value: Achieves sub-kA/m resolution with 1.7 kΩ bridge resistance compatible with low-power battery-operated traffic nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar magnetic field sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Honeywell SS495A | Linear Hall effect sensor; 1.3 mV/G sensitivity; 5 V supply only; no Hx bias requirement | Lower sensitivity (1.3 mV/G ≈ 1.0 mV/(kA/m)); no external magnet needed but higher noise floor | Prefer for simpler assembly where external Hx magnet adds cost/complexity |
| NXP KMZ60 | GMR sensor; 3.5 mV/V sensitivity; integrated Hx coil; 3.3 V supply; digital SPI output option | On-chip Hx generation eliminates external magnet; includes built-in ADC and diagnostics | Choose when system-level integration, diagnostics, or digital interface outweighs analog simplicity |
Compared with ZMY20TC, SS495A offers plug-and-play operation without bias magnets but sacrifices sensitivity and thermal stability; KMZ60 provides integrated signal conditioning and diagnostics at the cost of higher supply constraints and reduced analog flexibility.
Availability
ZMY20TC is available at Aetrix Electronics and suitable for automotive door switches, industrial fluid metering, engine crank position sensing, and traffic vehicle classification requiring stable component supply across extended temperature ranges.
Supply support for ZMY20TC 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
Zetex Semiconductors (now part of Diodes Incorporated) is an ISO 9001/TS16949-certified UK-based analog semiconductor manufacturer specializing in high-reliability discrete and sensor solutions.
The ZMY series was designed specifically for contactless analog magnetic field measurement in harsh environments, targeting automotive, industrial, and utility metering applications where precision, temperature resilience, and long-term stability are critical.
FAQ
What external magnet strength is required for ZMY20TC stabilization?
ZMY20TC requires a perpendicular auxiliary magnetic field Hx of exactly 3 kA/m (≈37.7 Oe) to suppress hysteresis and stabilize sensitivity. This is typically achieved using a small NdFeB magnet placed 1–2 mm from the chip edge, as specified in the Zetex application note AN-ZMY20-1.
Can ZMY20TC operate without an external Hx magnet?
No - operation without the 3 kA/m Hx field results in significant hysteresis (>500 µV/V) and unstable sensitivity. The datasheet explicitly states that the sensor "has to be reset after leaving the safe operating area" and requires Hx for all functional use, confirmed in Figure 4's safe operating area plot.
Is the ZMY20TC pinout compatible with ZMY20TA?
Yes - both ZMY20TC and ZMY20TA share identical SOT223 pinout (pin 1 = +VO, pin 2 = +VB, pin 3 = −VO, pin 4 = −VB) and electrical specifications; only reel packaging differs (13″/4000 vs 7″/1000 units), per Zetex ordering information table on page 1.
What is the maximum allowable supply voltage derating at +125°C?
At +125°C, the maximum supply voltage must be derated to 8.5 V, based on the VBmax=f(Tamb) curve in Figure 5 of the datasheet. This ensures total power dissipation remains ≤120 mW given the +0.3 %/K TCRbr and rising bridge resistance at elevated temperature.
ZMY20TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Magnetoresistive
- Axis:
- X, Y
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 12V
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Resolution:
- -
- Bandwidth:
- -
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Internal Magnet
- Supplier Device Package:
- SOT-223-3
- Mounting Type:
- Surface Mount
ZMY20TC FAQ
1.How can I place an order for ZMY20TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMY20TC 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 ZMY20TC reliable?
The price and inventory of ZMY20TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMY20TC is usually 5 days.
3.What payment methods are accepted for ZMY20TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMY20TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMY20TC?
ZMY20TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMY20TC 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 ZMY20TC?
For technical support, including ZMY20TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMY20TC requirements.
6.How does Aetrix verify that ZMY20TC is sourced from the original manufacturer or authorized distributors?
All ZMY20TC 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 ZMY20TC meets industry standards.
7.What is the process for return or replacement of ZMY20TC?
All ZMY20TC units undergo pre-shipment inspection (PSI). If there is an issue with ZMY20TC, 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 ZMY20TC part is unused and in its original packaging.
Return procedure for ZMY20TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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