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Taiwan Semiconductor Corporation 2M19Z
- Part No.:
- 2M19Z
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
2M19Z.pdf
- Description:
- DIODE ZENER 19V 2W DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,673
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Product details
Overview
2M19Z from Taiwan Semiconductor is a 2 W, 19 V Zener diode in DO-204AC (DO-15) package, featuring glass-passivated junction, 11 Ω maximum zener impedance at 26.3 mA test current, and ≤0.5 µA leakage current at 14.4 V reverse voltage. 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 2M19Z datasheet, 2M19Z pinout, 2M19Z application, or 2M19Z equivalent, key selection criteria include its ±5% zener voltage tolerance, AEC-Q101 qualification option (2M19ZH), 175°C maximum junction temperature, and compatibility with J-STD-002 soldering standards for high-reliability PCB assembly.
Technical Context
The 2M19Z operates as a single-die, silicon planar Zener diode with a nominal breakdown voltage of 19 V at 26.3 mA test current (IZT). Its zener impedance is specified at 11 Ω (ZZT) and 750 Ω (ZZK), indicating stable regulation under both nominal and knee-region bias conditions.
Thermal performance is defined by a junction-to-lead thermal resistance (ΘJL) that varies with lead length - e.g., ~40°C/W at 0.375" (9.5 mm) - and supports steady-state dissipation up to 2 W at TL = 75°C with appropriate PCB copper pad area (10 mm × 10 mm).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 19 V at 26.3 mA - defines precise regulation point for feedback loops and reference generation |
| ZZT @ IZT | 11 Ω - low dynamic impedance ensures minimal output voltage variation under load transients |
| IR @ VR | ≤0.5 µA at 14.4 V - enables low-power standby operation without significant quiescent current loss |
| PD | 2 W - supports robust surge handling in transient suppression applications with proper heatsinking |
| TJ MAX | +175°C - allows deployment in under-hood automotive environments and high-temperature industrial enclosures |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package compatible with legacy through-hole assembly |
| Configuration | Single die - simplifies BOM and eliminates internal mismatch concerns in dual-Zener configurations |
Pinout & Package
DO-204AC (DO-15) package with axial leads; cathode indicated by band. 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 / low-side connection in shunt regulator | Connected to ground or lower potential node; carries full load current during regulation |
| Cathode | Zener breakdown terminal / high-side connection in shunt regulator | Connected to input rail or protected node; clamps voltage above 19 V by conducting reverse current |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enhances long-term reliability and moisture resistance in humid or thermally cycled environments |
| AEC-Q101 qualified version available (2M19ZH) | Validated for automotive powertrain and body electronics per stress test requirements |
| UL 94V-0 molding compound | Prevents flame propagation in safety-critical systems requiring fire-retardant materials |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 for environmentally restricted manufacturing and end-of-life processing |
Applications
| Automotive Voltage Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 12 V battery rail against load dump spikes in engine control modules. IC Role / Device Role / Timing Role: Shunt regulator providing passive overvoltage protection upstream of LDOs and microcontrollers. Use Value: Withstands 15 A non-repetitive surge (IFSM) and maintains 19 V regulation tolerance within ±5%, preventing downstream IC damage. | Use Scenario: Generating stable 19 V reference for analog front-end amplifiers in pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source with low 0.5 µA leakage ensuring minimal error in ratiometric measurements. Use Value: 11 Ω zener impedance minimizes output drift under varying sensor excitation current, improving measurement repeatability. |
| Power Supply Feedback Divider | ESD-Suppressed I/O Protection |
Use Scenario: Setting output voltage in isolated flyback converter feedback network using optocoupler-coupled regulation. IC Role / Device Role / Timing Role: Zener element in secondary-side voltage sensing path, defining regulated output setpoint. Use Value: Tight 19 V tolerance and stable thermal coefficient enable ±1% output accuracy across –40°C to +125°C ambient range. | Use Scenario: Protecting RS-485 transceiver inputs from ESD and cable-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Primary shunt clamp limiting line voltage to 19 V before TVS diode activation. Use Value: Glass passivation and 175°C TJ max allow reliable operation in unventilated control cabinets with ambient temperatures up to 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, no AEC-Q101 option | Limited to lower-power, non-automotive applications due to reduced power handling and thermal rating | Select when cost sensitivity outweighs power/temperature requirements and AEC-Q101 is not mandated |
| BZX55C18 | 18 V nominal, 500 mW rating, DO-35 package, ±5% tolerance, RoHS compliant | Suitable only for low-current signal-level clamping; insufficient for 2 W surge or industrial rail protection | Choose for space-constrained PCBs where 18 V regulation suffices and thermal margin is not critical |
Compared with 1N4742A and BZX55C18, the 2M19Z delivers higher power dissipation (2 W vs. 1 W/0.5 W), superior thermal capability (+175°C TJ), and optional AEC-Q101 qualification - making it uniquely suited for automotive and industrial environments demanding sustained reliability under electrical and thermal stress.
Availability
2M19Z is available at Aetrix Electronics and suitable for automotive voltage clamping, industrial sensor reference design, and power supply feedback divider applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 2M19Z 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, rectifiers, and TVS components, with global distribution and AEC-Q101 validation capability.
The 2MxxZ series was designed specifically for high-reliability voltage regulation and transient suppression in automotive and industrial power systems, emphasizing thermal robustness, tight voltage tolerance, and process-controlled glass passivation.
FAQ
What is the zener voltage tolerance for 2M19Z?
The 2M19Z has a standard zener voltage tolerance of ±5% at 26.3 mA test current, as specified in the Electrical Characteristics table. This tolerance applies to the nominal 19 V breakdown voltage and is measured under JEDEC-compliant conditions: 40 ms ±10 ms current pulse, ambient temperature of 25°C, and lead length of 0.375". Tighter tolerances are available as special-order variants.
Is 2M19Z suitable for automotive applications?
Yes - the 2M19Z is offered in an AEC-Q101 qualified variant (2M19ZH) that meets stress test requirements for automotive powertrain and body electronics. The base 2M19Z shares identical electrical and thermal specifications, but only the "H" suffix version is certified. Its 175°C maximum junction temperature and glass-passivated junction support under-hood deployment.
What is the maximum non-repetitive surge current for 2M19Z?
The 2M19Z supports a maximum non-repetitive surge peak forward current (IFSM) of 15 A for an 8.3 ms single half-sine wave, per JEDEC standards. This rating assumes mounting on a 10 mm × 10 mm Cu-Pad PCB at TL = 75°C. Surge capability is validated for load dump and inductive switching event suppression in 12 V systems.
How does the zener impedance of 2M19Z affect regulation stability?
The 2M19Z exhibits 11 Ω maximum zener impedance (ZZT) at 26.3 mA, ensuring minimal output voltage deviation (<0.3 V) under ±10 mA load changes. This low dynamic impedance directly improves regulation accuracy in feedback networks and reference supplies, especially when paired with low-noise op-amps or precision ADCs in sensor interfaces.
What packaging options are available for 2M19Z?
The 2M19Z is supplied in DO-204AC (DO-15) package with three packing formats: 3,500 units per tape-and-reel (2M19Z or 2M19ZH), 1,500 units per ammo box (2M19Z A0G or 2M19ZHA0G), and 3,500 units per tape-and-reel with halogen-free marking (2M19ZH). All versions use pure tin-plated leads compliant with J-STD-002 solderability.
2M19Z 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):
- 19 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 11 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 14.4 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)
2M19Z FAQ
1.How can I place an order for 2M19Z through Aetrix?
Please submit a Request for Quotation (RFQ) for 2M19Z 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 2M19Z reliable?
The price and inventory of 2M19Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2M19Z is usually 5 days.
3.What payment methods are accepted for 2M19Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2M19Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2M19Z?
2M19Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2M19Z 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 2M19Z?
For technical support, including 2M19Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2M19Z requirements.
6.How does Aetrix verify that 2M19Z is sourced from the original manufacturer or authorized distributors?
All 2M19Z 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 2M19Z meets industry standards.
7.What is the process for return or replacement of 2M19Z?
All 2M19Z units undergo pre-shipment inspection (PSI). If there is an issue with 2M19Z, 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 2M19Z part is unused and in its original packaging.
Return procedure for 2M19Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2M19Z Tags
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MMSZ4682T1G
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MM5Z5V1ST1G
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SMAZ12-13-F
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