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onsemi MM3Z27VB
- Part No.:
- MM3Z27VB
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
MM3Z27VB.pdf
- Description:
- DIODE ZENER 27V 200MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:23,955
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Product details
Overview
MM3Z27VB from onsemi is a 27 V ±2% Zener diode in SOD−323FL package, rated for 200 mW power dissipation, 75 Ω dynamic impedance at 2 mA test current, and 18.9 V reverse breakdown voltage at 0.045 µA leakage. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MM3Z27VB datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal limits, cathode/anode terminal roles, SOD−323FL package dimensions, and direct alternatives for voltage reference design and ESD-robust signal conditioning.
Technical Context
The MM3Z27VB operates as a two-terminal silicon Zener diode with sharp reverse breakdown at 27 V nominal, characterized under pulse conditions (10 ms) to minimize self-heating effects. Its ±2% tolerance and 75 Ω Zener impedance at IZT = 2 mA support stable regulation in low-current bias networks.
Designed for surface-mount use in space-constrained applications, it features matte tin (Pb-free) terminations and a maximum junction temperature of 150 °C. Thermal resistance from junction-to-ambient is 595 °C/W, limiting continuous DC operation to ≤1.3 mA at 25 °C ambient without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.46 V (min) to 27.54 V (max) at IZT = 2 mA - defines regulation band for precision reference use |
| Zener Impedance (ZZT) | 75 Ω max at IZT = 2 mA - determines output voltage stability under load variation |
| Power Dissipation (PD) | 200 mW at TA = 25 °C - sets absolute thermal limit for PCB layout and trace width planning |
| Reverse Leakage (IR) | 0.045 µA max at VR = 18.9 V - ensures minimal quiescent current in high-impedance sensing nodes |
| Junction Temperature (TJ) | 150 °C max - constrains operating ambient and heatsinking requirements in sealed enclosures |
| Thermal Resistance (RJA) | 595 °C/W - indicates need for copper pour or thermal vias if operating above 50 mW continuously |
Pinout & Package
SOD−323FL package: ultra-thin, surface-mount plastic case with gull-wing leads; dimensions per CASE 477AB (0.047" × 0.031", 1.2 mm × 0.8 mm); matte tin (Pb-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation; carries full Zener current during clamping |
| 2 (Cathode) | Zener breakdown terminal | Connected to regulated voltage rail; polarity marking aligns with cathode band on device body |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight reference accuracy without external trimming in 12-bit ADC biasing and sensor excitation |
| 200 mW power rating | Supports regulation in low-current microcontroller reset circuits and op-amp reference dividers |
| SOD−323FL footprint | Reduces board area by >50% vs. DO-35; compatible with standard 0402 reflow profiles |
| Pb-free matte tin finish | Meets RoHS/REACH requirements and eliminates lead-tin intermetallic growth risk in long-life industrial modules |
Applications
| Microcontroller Reset Circuit | ADC Reference Divider |
|---|---|
Use Scenario: Generating a stable 27 V reset threshold for ARM Cortex-M4-based motor control MCU with brown-out detection. IC Role / Device Role / Timing Role: Zener diode acting as precision voltage comparator input reference. Use Value: ±2% VZ tolerance ensures reset triggers within 0.54 V window, preventing false resets during line transients. | Use Scenario: Scaling down 30 V supply to 27 V reference for 12-bit SAR ADC used in battery voltage monitoring. IC Role / Device Role / Timing Role: Passive voltage regulator establishing stable reference point for analog front-end. Use Value: 75 Ω ZZT minimizes loading error when driving 10 kΩ ADC reference input, maintaining <0.1% gain error. |
| ESD-Clamped Signal Line | Overvoltage Protection for Sensor Interface |
Use Scenario: Protecting RS-485 transceiver inputs against ±30 V surges in factory automation wiring. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor (anode-cathode clamp configuration). Use Value: 18.9 V reverse standoff allows normal 24 V bus operation while clamping >27 V transients to safe levels. | Use Scenario: Safeguarding 4–20 mA current loop transmitter outputs against accidental 48 V DC connection. IC Role / Device Role / Timing Role: Reverse-biased Zener shunt limiter placed across output terminals. Use Value: 200 mW rating sustains 7.4 mA clamping current at 27 V, absorbing 200 mJ surge energy without failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B27 | Same 27 V ±2%, but SOD-323 package with 400 mW rating and higher ZZT (120 Ω) | Higher power handling supports 10 mA continuous regulation; less stable under light loads | Select for higher-current reference needs where thermal margin is critical |
| MMSZ5258B | 27 V ±5%, SOD-123 package, 500 mW rating, ZZT = 40 Ω at 20 mA | Looser tolerance trades accuracy for lower impedance at higher test current | Choose when cost sensitivity outweighs ±2% precision and board space permits larger SOD-123 footprint |
Compared with BZX384-B27 and MMSZ5258B, the MM3Z27VB offers tighter tolerance and lower Zener impedance at low current (2 mA), making it optimal for battery-powered sensor nodes and low-quiescent-current bias networks where regulation stability below 1 mA matters most.
Availability
MM3Z27VB is available at Aetrix Electronics and suitable for microcontroller reset circuits, ADC reference dividers, ESD-clamped signal lines, and overvoltage protection for sensor interfaces requiring stable component supply and RoHS-compliant sourcing.
Supply support for MM3Z27VB 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MM3Z series targets compact, high-precision voltage reference and protection functions in portable and space-constrained electronics, emphasizing tight tolerance, low leakage, and Pb-free manufacturability.
FAQ
What is the Zener voltage tolerance of MM3Z27VB?
The MM3Z27VB has a nominal Zener voltage of 27 V with a guaranteed tolerance of ±2%, meaning its actual breakdown voltage falls between 26.46 V and 27.54 V when tested at IZT = 2 mA. This tight tolerance is specified per onsemi's Rev. 3 datasheet and enables accurate voltage referencing without calibration in low-power analog circuits using the MM3Z27VB.
What package type does MM3Z27VB use?
The MM3Z27VB uses the SOD−323FL package (CASE 477AB), a miniature surface-mount plastic case measuring 1.2 mm × 0.8 mm with gull-wing leads and matte tin (Pb-free) terminations. This package is confirmed in the official onsemi datasheet and supports automated placement and reflow soldering in high-density PCB layouts for the MM3Z27VB.
What is the maximum power dissipation for MM3Z27VB?
The MM3Z27VB has a maximum power dissipation of 200 mW at ambient temperature (TA) = 25 °C. This value is defined in the Absolute Maximum Ratings table and must be derated linearly above 25 °C using the 595 °C/W junction-to-ambient thermal resistance - for example, to ~120 mW at 75 °C ambient - to ensure reliable operation of the MM3Z27VB.
How does MM3Z27VB behave under reverse leakage conditions?
The MM3Z27VB exhibits a maximum reverse leakage current of 0.045 µA at a reverse voltage (VR) of 18.9 V, as specified in the Electrical Characteristics table. This ultra-low leakage preserves signal integrity in high-impedance nodes and extends battery life in always-on monitoring systems powered by the MM3Z27VB.
Is MM3Z27VB suitable for ESD protection applications?
Yes, the MM3Z27VB is commonly used for low-energy ESD clamping due to its well-defined 27 V breakdown and low leakage. Its 18.9 V reverse standoff voltage allows safe operation below system rails, while its 200 mW rating handles typical IEC 61000-4-2 contact discharges when paired with current-limiting resistors - a validated use case for the MM3Z27VB in industrial interface protection.
MM3Z27VB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
MM3Z27VB FAQ
1.How can I place an order for MM3Z27VB through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z27VB 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 MM3Z27VB reliable?
The price and inventory of MM3Z27VB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z27VB is usually 5 days.
3.What payment methods are accepted for MM3Z27VB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z27VB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z27VB?
MM3Z27VB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z27VB 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 MM3Z27VB?
For technical support, including MM3Z27VB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z27VB requirements.
6.How does Aetrix verify that MM3Z27VB is sourced from the original manufacturer or authorized distributors?
All MM3Z27VB 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 MM3Z27VB meets industry standards.
7.What is the process for return or replacement of MM3Z27VB?
All MM3Z27VB units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z27VB, 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 MM3Z27VB part is unused and in its original packaging.
Return procedure for MM3Z27VB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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