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Taiwan Semiconductor Corporation 2M18Z
- Part No.:
- 2M18Z
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
2M18Z.pdf
- Description:
- DIODE ZENER 18V 2W DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,092
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Product details
Overview
2M18Z from Taiwan Semiconductor is a 2 W, 18 V Zener diode in DO-204AC (DO-15) package, featuring 10 Ω maximum zener impedance at 27.8 mA test current, ≤0.5 µA leakage at 13.7 V, and operation across –55°C to +175°C junction temperature range. It serves as a precision voltage reference and overvoltage protection device in automotive power rails and industrial sensor signal conditioning circuits.
For engineers reviewing the 2M18Z datasheet, 2M18Z pinout, 2M18Z application, or 2M18Z equivalent, key selection criteria include its AEC-Q101 qualification option, glass-passivated junction for reliability, UL 94V-0 molding compound, pure tin-plated leads compliant with J-STD-002, and verified 100 mA maximum zener current under non-repetitive surge conditions.
Technical Context
The 2M18Z operates as a single-die, unidirectional Zener diode optimized for stable reverse-bias regulation. Its 18 V nominal zener voltage is specified at 27.8 mA (IZT), with tight ±5% tolerance, 10 Ω dynamic impedance (ZZT), and low 0.5 µA leakage (IR) at VR = 13.7 V - enabling accurate clamping in low-power analog monitoring paths.
Thermal design is supported by a 175°C maximum junction temperature, 0.400 g mass, and transient thermal resistance curves validated per JEDEC standards. The DO-204AC package allows standard through-hole mounting on 10 mm × 10 mm Cu pads, delivering 2 W steady-state dissipation at TL = 75°C with 15 A IFSM surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% at 27.8 mA - defines precise clamping threshold for 12–24 V system protection |
| Power Dissipation (PD) | 2 W at TL = 75°C - supports continuous regulation in compact PCB layouts with copper pad heatsinking |
| Zener Impedance (ZZT) | 10 Ω max at IZT - ensures minimal voltage deviation under load transients up to 10% of IZT |
| Leakage Current (IR) | ≤0.5 µA at 13.7 V - enables low-quiescent-current biasing in battery-backed circuits |
| Max Zener Current (IZM) | 100 mA non-repetitive - sustains short-duration surges without degradation when used with series limiting resistors |
| Junction Temp Range (TJ) | –55°C to +175°C - qualified for under-hood automotive and high-temp industrial environments |
| Package | DO-204AC (DO-15) - industry-standard through-hole outline with cathode band polarity marking |
Pinout & Package
DO-204AC (DO-15) package with axial leads: anode and cathode terminals identified by cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during normal forward bias; forms return path in reverse-bias regulation |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; voltage clamping occurs between cathode and anode at VZ = 18 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term stability and moisture resistance in humid or thermally cycled environments |
| AEC-Q101 qualification option | Validates robustness for automotive power management and body electronics applications |
| UL 94V-0 molding compound | Meets flammability safety requirements for enclosed industrial control enclosures |
| Low IR at rated VR | 0.5 µA leakage at 13.7 V enables use in ultra-low-power standby circuits without significant drain |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping transients on 12 V battery-fed ECUs exposed to load dump events. IC Role / Device Role / Timing Role: Zener diode providing primary overvoltage suppression at input stage. Use Value: 18 V clamping threshold aligns with ISO 7637-2 Pulse 5a limits; 15 A IFSM handles surge energy without failure. | Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end op-amps. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed bias point. Use Value: 10 Ω ZZT minimizes output drift under varying load currents; ±5% VZ tolerance ensures repeatability across production batches. |
| Consumer Power Adapter Feedback | Telecom Line Interface Protection |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters with optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference setting error amplifier trip point. Use Value: Stable 18 V regulation at 27.8 mA enables accurate feedback loop response; glass passivation prevents parameter shift over 10-year service life. | Use Scenario: Overvoltage protection on RS-485 bus lines subjected to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Standby clamping device shunting excess energy to ground. Use Value: 175°C TJ rating allows operation near hot-running PHY ICs; DO-15 footprint integrates into legacy telecom board layouts without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | 18 V, 1 W, DO-41 package, 20 Ω ZZT at 19 mA | Limited to lower power dissipation; not AEC-Q101 qualified | Choose for cost-sensitive consumer designs where 1 W rating suffices and automotive qualification is unnecessary |
| BZX85C18 | 18 V, 1.3 W, DO-41, 20 Ω ZZT at 5 mA, no AEC-Q101 option | Higher ZZK, lower IZM (65 mA), less stable at elevated temperatures | Select when space-constrained DO-41 mounting is required and full 2 W derating is not needed |
Compared with 1N4746A and BZX85C18, the 2M18Z delivers higher power handling (2 W vs. ≤1.3 W), lower dynamic impedance (10 Ω vs. ≥20 Ω), and optional AEC-Q101 qualification - making it preferable for automotive and industrial systems requiring sustained reliability under thermal stress.
Availability
2M18Z is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor signal conditioning, and telecom line interface protection requiring stable component supply and long-term lifecycle support.
Supply support for 2M18Z 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, including Zener diodes, TVS, rectifiers, and MOSFETs, with global distribution and AEC-Q101 validation capabilities.
The 2MxxZ family was designed specifically for high-reliability voltage regulation and transient suppression in automotive and industrial applications, emphasizing thermal robustness, tight parametric control, and standardized DO-204AC packaging.
FAQ
What is the zener voltage tolerance for 2M18Z?
The 2M18Z has a standard zener voltage tolerance of ±5% at 27.8 mA test current, as specified in the electrical characteristics table. This tolerance applies under ambient temperature conditions of 25°C and pulse measurement per JEDEC standards. Tighter tolerances are available as special-order variants but are not part of the standard 2M18Z offering.
Is 2M18Z suitable for automotive applications?
Yes - the 2M18Z is offered in an AEC-Q101 qualified version (e.g., 2M18ZH), validated for automotive powertrain and body electronics. Its –55°C to +175°C operating junction temperature range, glass-passivated junction, and JESD 201 Class 2 whisker resistance make it appropriate for under-hood and chassis-mounted systems where thermal cycling and long-term reliability are critical.
What is the maximum non-repetitive surge current for 2M18Z?
The 2M18Z supports a maximum non-repetitive peak forward surge current (IFSM) of 15 A for an 8.3 ms half-sine wave, per JEDEC standards. This rating assumes proper PCB copper pad heatsinking (10 mm × 10 mm) and is independent of the 100 mA maximum zener current (IZM) specified for reverse-bias surge conditions.
How does the zener impedance of 2M18Z affect circuit performance?
The 2M18Z exhibits a maximum zener impedance (ZZT) of 10 Ω at 27.8 mA, meaning output voltage variation remains within ±0.27 V for ±2.7 mA load changes. This low impedance ensures stable regulation in feedback loops and low-drift reference applications, especially when paired with low-noise op-amps in precision analog signal chains.
What packaging options are available for 2M18Z?
The 2M18Z is supplied in DO-204AC (DO-15) package with three ordering variants: standard tape-and-reel (3,500 units), ammo box (1,500 units), and AEC-Q101 qualified versions denoted by "H" suffix (e.g., 2M18ZH). All variants use pure tin-plated leads compliant with J-STD-002 and meet RoHS and halogen-free requirements per IEC 61249-2-21.
2M18Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 13.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
2M18Z FAQ
1.How can I place an order for 2M18Z through Aetrix?
Please submit a Request for Quotation (RFQ) for 2M18Z 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 2M18Z reliable?
The price and inventory of 2M18Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2M18Z is usually 5 days.
3.What payment methods are accepted for 2M18Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2M18Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2M18Z?
2M18Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2M18Z 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 2M18Z?
For technical support, including 2M18Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2M18Z requirements.
6.How does Aetrix verify that 2M18Z is sourced from the original manufacturer or authorized distributors?
All 2M18Z 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 2M18Z meets industry standards.
7.What is the process for return or replacement of 2M18Z?
All 2M18Z units undergo pre-shipment inspection (PSI). If there is an issue with 2M18Z, 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 2M18Z part is unused and in its original packaging.
Return procedure for 2M18Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2M18Z Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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