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onsemi MM3Z39VB
- Part No.:
- MM3Z39VB
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
MM3Z39VB.pdf
- Description:
- DIODE ZENER 39V 200MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:12,970
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Product details
Overview
MM3Z39VB from onsemi is a 39 V ±2% Zener diode in SOD−323FL package, rated for 200 mW power dissipation, 122 Ω dynamic impedance at 5 mA test current, and 0.045 µA reverse leakage at 27.3 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MM3Z39VB datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, cathode/anode terminal mapping, and direct alternatives for voltage reference design and overvoltage protection circuits.
Technical Context
The MM3Z39VB operates as a two-terminal silicon Zener diode with sharp breakdown knee and stable regulation under DC or pulsed conditions (10 ms pulse width). Its 39 V nominal Zener voltage is specified at IZT = 5 mA with ±2% tolerance, and it maintains regulation down to IZK = 0.5 mA with ZZK = 329 Ω.
Thermal resistance is 595 °C/W (junction-to-ambient), limiting continuous operation to ≤200 mW at TA = 25 °C. Reverse leakage remains ≤0.045 µA at VR = 27.3 V, ensuring minimal quiescent current in high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.22–39.78 V @ IZT = 5 mA; defines precise regulation point for feedback loops and references |
| Zener Impedance (ZZT) | 122 Ω max @ IZT = 5 mA; determines output voltage variation under load transients |
| Power Dissipation (PD) | 200 mW max @ TA = 25 °C; sets upper bound for safe continuous DC operation |
| Reverse Leakage (IR) | ≤0.045 µA @ VR = 27.3 V; ensures negligible current draw in standby or high-Z sensing nodes |
| Junction Temperature (TJ) | 150 °C max; constrains PCB layout and thermal relief for reliability in enclosed environments |
| Package | SOD−323FL (Case 477AB); 1.7 × 1.25 × 0.9 mm footprint enabling dense placement in space-constrained designs |
Pinout & Package
SOD−323FL surface-mount package with gull-wing leads; anode (pin 1) and cathode (pin 2) marked by polarity band on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full regulator current during breakdown |
| 2 (Cathode) | Zener breakdown terminal | Marked with band; connected to regulated output node; voltage referenced to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate voltage setting without post-production trimming in 39 V reference designs |
| Matte tin (Sn) finish, Pb-free | Complies with RoHS and JEDEC J-STD-020 reflow profiles for lead-free assembly |
| Low leakage (0.045 µA) | Minimizes error in high-impedance divider networks and battery-powered sensor references |
| Small SOD−323FL footprint | Reduces board area by >50% vs. DO-35 or SOD-123 packages, supporting miniaturized wearables and IoT nodes |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener diode providing 39 V reference for op-amp gain-setting resistors and ADC biasing. Use Value: Tight ±2% tolerance ensures <0.5% full-scale error across temperature, meeting IEC 61000-4-5 surge immunity requirements. | Use Scenario: Generating precise 39 V auxiliary rail for USB-C PD controller logic and gate drivers. IC Role / Device Role / Timing Role: Shunt regulator maintaining stable supply for PD communication ICs during variable input conditions. Use Value: Low 122 Ω ZZT limits output droop to <50 mV under 1 mA load steps, preserving PD negotiation integrity. |
| Medical Pulse Oximeter Front-End | Automotive Cabin Control Panel LED Bias |
Use Scenario: Supplying calibrated bias to photodiode transimpedance amplifiers in portable oximeters. IC Role / Device Role / Timing Role: Voltage reference establishing fixed photocurrent-to-voltage conversion gain. Use Value: 0.045 µA leakage prevents baseline drift in pA-level current measurement paths, sustaining SpO2 accuracy to ±1.5%. | Use Scenario: Regulating current through high-brightness LEDs in automotive HVAC displays. IC Role / Device Role / Timing Role: Zener clamp protecting LED driver ICs from 42 V load-dump transients. Use Value: 150 °C max junction rating allows operation in dash-mounted assemblies without derating below 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B39,115 (Nexperia) | Same 39 V ±2%, SOD-323 package, but 300 mW PD rating and 90 Ω ZZT | Higher power margin supports transient-heavy automotive environments | Select when operating near thermal limits or requiring tighter impedance control |
| MMBZ5242B (onsemi) | 39 V ±5%, SOT-23 package, 350 mW PD, 100 Ω ZZT | Larger footprint and looser tolerance; suited for non-critical biasing | Choose for cost-sensitive consumer designs where ±5% regulation suffices |
Compared with MM3Z39VB, the BZX384-B39 offers higher power headroom and lower impedance for demanding regulation, while MMBZ5242B trades tolerance and size for cost and availability in legacy SOT-23 layouts.
Availability
MM3Z39VB is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, medical pulse oximeter front-end, and automotive cabin control panel LED bias requiring stable component supply and RoHS-compliant sourcing.
Supply support for MM3Z39VB 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 is designed for precision voltage reference and regulation in space-constrained, low-power analog systems, emphasizing tight tolerance, low leakage, and robust SMD packaging for automated assembly.
FAQ
What is the Zener voltage tolerance of MM3Z39VB?
The MM3Z39VB has a Zener voltage tolerance of ±2% at 39 V nominal, tested at IZT = 5 mA per onsemi datasheet Rev. 3 (August 2023). This means its actual breakdown voltage falls between 38.22 V and 39.78 V under standard test conditions, making MM3Z39VB suitable for applications requiring tight voltage reference stability without calibration.
What is the maximum power dissipation for MM3Z39VB?
The MM3Z39VB is rated for 200 mW maximum power dissipation at TA = 25 °C, with thermal resistance RJA = 595 °C/W. Derating is required above 25 °C ambient - approximately 0.336 mW/°C - to maintain junction temperature ≤150 °C. This limit defines safe continuous operation in MM3Z39VB-based shunt regulators and reference circuits.
Does MM3Z39VB have a Pb-free finish?
Yes, MM3Z39VB features a matte tin (Sn) finish and is Pb-free, compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The SOD−323FL package uses lead-free terminations compatible with standard reflow soldering profiles, confirming MM3Z39VB's suitability for environmentally regulated manufacturing.
What is the reverse leakage current of MM3Z39VB at 27.3 V?
At VR = 27.3 V (70% of nominal VZ), the MM3Z39VB exhibits a maximum reverse leakage current of 0.045 µA, as specified in the Electrical Characteristics table. This ultra-low leakage ensures minimal loading in high-impedance reference dividers and preserves accuracy in battery-powered MM3Z39VB applications such as portable medical sensors.
How is the cathode identified on MM3Z39VB?
The cathode of MM3Z39VB is marked by a polarity band located at the end of the SOD−323FL package body, corresponding to pin 2 in the connection diagram. This band aligns with industry-standard SOD-323 marking conventions and must be oriented toward the higher-potential node when using MM3Z39VB as a shunt regulator to ensure proper reverse-bias operation.
MM3Z39VB 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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 122 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 27.3 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
MM3Z39VB FAQ
1.How can I place an order for MM3Z39VB through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z39VB 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 MM3Z39VB reliable?
The price and inventory of MM3Z39VB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z39VB is usually 5 days.
3.What payment methods are accepted for MM3Z39VB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z39VB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z39VB?
MM3Z39VB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z39VB 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 MM3Z39VB?
For technical support, including MM3Z39VB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z39VB requirements.
6.How does Aetrix verify that MM3Z39VB is sourced from the original manufacturer or authorized distributors?
All MM3Z39VB 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 MM3Z39VB meets industry standards.
7.What is the process for return or replacement of MM3Z39VB?
All MM3Z39VB units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z39VB, 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 MM3Z39VB part is unused and in its original packaging.
Return procedure for MM3Z39VB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM3Z39VB Tags
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