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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Vishay General Semiconductor - Diodes Division TZMC27-GS18

Name: TZMC27-GS18
Brand: Vishay General Semiconductor - Diodes Division
SKU: TZMC27-GS18
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TZMC27-GS18

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: TZMC27-GS18.pdf

Description:: DIODE ZENER 27V 500MW SOD80

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Product details

Overview

TZMC27-GS18 from Vishay Semiconductors is a precision small-signal Zener diode in MiniMELF (SOD-80) package, designed for voltage stabilization and reference applications. It delivers a nominal Zener voltage of 27 V with ±5 % tolerance at 5 mA test current, 20 Ω dynamic resistance, and a positive temperature coefficient of +0.04 %/K - enabling stable regulation in low-power analog circuits and power supply feedback paths.

For engineers reviewing the TZMC27-GS18 datasheet, TZMC27-GS18 pinout, TZMC27-GS18 application, or TZMC27-GS18 equivalent, this component is evaluated for low-noise voltage reference design, reverse-biased stabilization in sensor signal conditioning, and compact DC-DC feedback networks where tight V_Z tolerance and low leakage (< 0.1 μA at 95 % V_Zmin) are critical.

Technical Context

The TZMC27-GS18 operates as a single-element, silicon planar Zener diode with sharp reverse breakdown characteristics and low noise performance. Its 27 V nominal Zener voltage is specified at I_ZT = 5 mA, with dynamic resistance of 20 Ω (typ.) and reverse leakage current < 0.1 μA at VR = 25.1 V.

It features a positive temperature coefficient (+0.04 %/K), indicating V_Z increases with junction temperature - a key consideration for thermal drift compensation in precision references. The device is rated for P_tot = 500 mW and T_j up to 175 °C, with MSL level 1 handling per J-STD-020.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	25.1–28.9 V (min–max at I_ZT = 5 mA); ensures stable regulation across manufacturing spread and temperature
Tolerance	±5 % (TZMC series); supports cost-sensitive designs where tighter 2 % tolerance is not required
Dynamic Resistance (Z_Z)	20 Ω (typ. at I_ZT = 5 mA); minimizes output impedance for improved load regulation
Reverse Leakage (I_R)	< 0.1 μA at VR = 25.1 V; reduces quiescent current error in high-impedance reference nodes
Temperature Coefficient (TKV_Z)	+0.04 %/K (typ.); enables predictable V_Z drift modeling over -65 to +175 °C operating range
Power Dissipation (P_tot)	500 mW (at T_amb = 25 °C, R_thJA ≤ 300 K/W); defines maximum continuous power before thermal derating
Package	MiniMELF (SOD-80); cylindrical glass-body surface-mount package with cathode band marking and 31 mg weight

Pinout & Package

MiniMELF (SOD-80) is a two-terminal axial-lead-compatible surface-mount package with cathode identified by a band. No separate pin numbering applies - terminals are anode and cathode only.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / reference ground node	Connected to lower-potential side in reverse-biased Zener configuration; serves as return path for reference current
Cathode	Zener breakdown terminal / regulated output node	Marked with band; carries stabilized voltage when reverse-biased; connects to feedback node or load reference point

Key Features

Feature	Design Value
Very sharp reverse characteristic	Enables precise, low-hysteresis voltage clamping and clean turn-on in protection circuits
Low reverse current level	< 0.1 μA at 95 % V_Zmin; preserves accuracy in high-impedance bias networks and battery-powered references
Very high stability	Guaranteed long-term V_Z drift < 0.1 % after 1000 h burn-in; suitable for metrology-grade references
Low noise	Minimizes voltage ripple in analog signal chains and precision ADC/DAC reference supplies
V_Z-tolerance ±5 %	Cost-optimized specification for non-critical stabilization where 2 % variants (TZMB) are unnecessary

Applications

Overvoltage Protection Circuit	Low-Power Voltage Reference
Use Scenario: Clamp transient surges on 24 V industrial I/O lines using series resistor and TZMC27-GS18 to limit voltage to ≤28.9 V. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage limiter, absorbing excess energy during ESD or inductive kick events. Use Value: Prevents damage to downstream logic inputs rated for 30 V max, leveraging 27 V nominal clamping with 5 % tolerance margin.	Use Scenario: Provide stable 27 V reference for a 12-bit SAR ADC's internal gain stage calibration in portable test equipment. IC Role / Device Role / Timing Role: Precision voltage reference source in a ratiometric measurement architecture. Use Value: Enables <0.5 LSB offset error over temperature due to low dynamic resistance (20 Ω) and predictable +0.04 %/K drift.
DC-DC Converter Feedback Node	Sensor Excitation Supply
Use Scenario: Set output voltage of isolated flyback converter via optocoupler feedback, using TZMC27-GS18 to regulate TL431 reference input. IC Role / Device Role / Timing Role: Secondary-side Zener clamp defining upper bound of feedback voltage range. Use Value: Ensures feedback loop remains within TL431's 2.5 V input window while maintaining 27 V output setpoint with ±5 % accuracy.	Use Scenario: Bias resistive temperature detector (RTD) bridge with constant 27 V excitation in HVAC control module. IC Role / Device Role / Timing Role: Stable excitation voltage source for Wheatstone bridge, minimizing self-heating error. Use Value: Delivers <0.1 % line regulation over 10–100 mA load due to low Z_Z, reducing RTD measurement uncertainty to ±0.25 °C.

Overvoltage Protection Circuit

Low-Power Voltage Reference

Use Scenario: Clamp transient surges on 24 V industrial I/O lines using series resistor and TZMC27-GS18 to limit voltage to ≤28.9 V.

IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage limiter, absorbing excess energy during ESD or inductive kick events.

Use Value: Prevents damage to downstream logic inputs rated for 30 V max, leveraging 27 V nominal clamping with 5 % tolerance margin.

Use Scenario: Provide stable 27 V reference for a 12-bit SAR ADC's internal gain stage calibration in portable test equipment.

IC Role / Device Role / Timing Role: Precision voltage reference source in a ratiometric measurement architecture.

Use Value: Enables <0.5 LSB offset error over temperature due to low dynamic resistance (20 Ω) and predictable +0.04 %/K drift.

DC-DC Converter Feedback Node

Sensor Excitation Supply

Use Scenario: Set output voltage of isolated flyback converter via optocoupler feedback, using TZMC27-GS18 to regulate TL431 reference input.

IC Role / Device Role / Timing Role: Secondary-side Zener clamp defining upper bound of feedback voltage range.

Use Value: Ensures feedback loop remains within TL431's 2.5 V input window while maintaining 27 V output setpoint with ±5 % accuracy.

Use Scenario: Bias resistive temperature detector (RTD) bridge with constant 27 V excitation in HVAC control module.

IC Role / Device Role / Timing Role: Stable excitation voltage source for Wheatstone bridge, minimizing self-heating error.

Use Value: Delivers <0.1 % line regulation over 10–100 mA load due to low Z_Z, reducing RTD measurement uncertainty to ±0.25 °C.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode voltage stabilization applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C27 (ON Semiconductor)	Same 27 V nominal, ±5 % tolerance, but in DO-35 package (larger footprint, higher R_thJA = 500 K/W)	Less suitable for space-constrained PCBs; higher thermal resistance limits power handling in dense layouts	Select when legacy through-hole compatibility or higher surge robustness is prioritized over size
MMBZ5256BS-7-F (Diodes Inc.)	27 V, ±5 %, SOT-23 package; 3-terminal device with dual anode/cathode configuration (not single-element)	Requires different layout and biasing; not drop-in due to different pinout and dual-diode topology	Choose only if dual-Zener redundancy or SOT-23 assembly infrastructure exists

Compared with BZX55C27 and MMBZ5256BS-7-F, TZMC27-GS18 offers superior thermal performance (R_thJA = 500 K/W on PCB vs. 600+ K/W for DO-35) and smaller MiniMELF footprint than DO-35, while avoiding the complexity of multi-diode SOT-23 packages - making it optimal for high-density, thermally managed 27 V reference designs.

Availability

TZMC27-GS18 is available at Aetrix Electronics and suitable for voltage stabilization, precision reference generation, and overvoltage protection applications requiring stable component supply, consistent parametric performance, and RoHS-compliant MiniMELF packaging.

Supply support for TZMC27-GS18 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

Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.

The TZM-Series Zener diodes are engineered for precision voltage reference and stabilization in space-constrained, thermally demanding environments - emphasizing low noise, sharp knee characteristics, and long-term stability.

FAQ

What is the Zener voltage tolerance of TZMC27-GS18?

The TZMC27-GS18 has a Zener voltage tolerance of ±5 %, as defined by the TZMC series designation. This means its nominal 27 V Zener voltage falls between 25.1 V (min) and 28.9 V (max) when measured at I_ZT = 5 mA and T_amb = 25 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of Vishay document 84122 Rev. 1.8.

Does TZMC27-GS18 have a cathode marking, and how is polarity identified?

Yes, TZMC27-GS18 uses a cathode band marking on the MiniMELF (SOD-80) glass body to identify polarity. The banded end is the cathode; the opposite end is the anode. This marking is visible under standard optical inspection and aligns with JEDEC SOD-80 mechanical drawings in Vishay's package documentation (document no. 6.560-5005.01-4).

What is the maximum power dissipation rating for TZMC27-GS18?

The maximum power dissipation (P_tot) for TZMC27-GS18 is 500 mW at T_amb = 25 °C with R_thJA ≤ 300 K/W. Derating is required above 25 °C ambient, following the curve in Figure 1 of Vishay document 84122. At 75 °C ambient, usable power drops to approximately 350 mW.

Can TZMC27-GS18 be used in place of a 24 V Zener diode?

No - TZMC27-GS18 is specifically rated for 27 V nominal Zener voltage (25.1–28.9 V range). Substituting it for a 24 V Zener (e.g., TZMC24) would raise the regulated voltage by ~3 V, potentially exceeding downstream component ratings. Always match nominal V_Z and tolerance class (TZMC vs. TZMB) to circuit requirements.

Is TZMC27-GS18 compliant with lead-free and RoHS requirements?

Yes, TZMC27-GS18 is RoHS-compliant and lead-free, as confirmed by Vishay's material categorization statement in the datasheet (www.vishay.com/doc?99912) and its qualification per JEDEC J-STD-020 MSL level 1 - permitting standard Pb-free reflow profiles with peak temperature up to 260 °C.

TZMC27-GS18 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: TZM

Package/Case:: DO-213AC, MINI-MELF, SOD-80

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 27 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 20 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-80 MiniMELF

TZMC27-GS18 FAQ

1.How can I place an order for TZMC27-GS18 through Aetrix?

Please submit a Request for Quotation (RFQ) for TZMC27-GS18 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 TZMC27-GS18 reliable?

The price and inventory of TZMC27-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TZMC27-GS18 is usually 5 days.

3.What payment methods are accepted for TZMC27-GS18?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TZMC27-GS18 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TZMC27-GS18?

TZMC27-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TZMC27-GS18 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 TZMC27-GS18?

For technical support, including TZMC27-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TZMC27-GS18 requirements.

6.How does Aetrix verify that TZMC27-GS18 is sourced from the original manufacturer or authorized distributors?

All TZMC27-GS18 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 TZMC27-GS18 meets industry standards.

7.What is the process for return or replacement of TZMC27-GS18?

All TZMC27-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TZMC27-GS18, 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 TZMC27-GS18 part is unused and in its original packaging.

Return procedure for TZMC27-GS18:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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