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Vishay General Semiconductor - Diodes Division MMSZ5239C-E3-18
- Part No.:
- MMSZ5239C-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5239C-E3-18.pdf
- Description:
- DIODE ZENER 9.1V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,165
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Product details
Overview
MMSZ5239C-E3-18 from Vishay Semiconductors is a silicon planar Zener diode with a nominal zener voltage of 9.1 V, ±2 % tolerance, and 500 mW power dissipation rating at 25 °C on FR-4 board. It operates across -55 °C to +150 °C and delivers stable voltage regulation in low-power reference and protection circuits.
For engineers reviewing the MMSZ5239C-E3-18 datasheet, MMSZ5239C-E3-18 pinout, MMSZ5239C-E3-18 application, or MMSZ5239C-E3-18 equivalent, this part serves as a precision voltage clamp for analog signal conditioning, power supply feedback, and overvoltage protection where tight tolerance and AEC-Q101–compatible variants are not required.
Technical Context
This device functions as a single-element, cathode-marked Zener diode in reverse-biased operation, maintaining regulated voltage across its terminals when current exceeds the test current IZT1 of 20 mA. Its dynamic resistance is 10 Ω at IZT1, and temperature coefficient is +0.060 %/°C - indicating positive drift with rising junction temperature.
The SOD-123 package provides surface-mount compatibility with JEDEC-compliant thermal performance: RthJA = 420 K/W on FR-4, RthJL = 250 K/W, and maximum junction temperature of 150 °C. Reverse leakage remains ≤3 μA at VR = 7 V, supporting low-quiescent-current designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, ±2 % tolerance - ensures precise clamping within ±0.182 V at 25 °C |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - defines maximum continuous safe operating power under standard PCB layout |
| Test Current (IZT1) | 20 mA - the reference current at which VZ is specified and dynamic resistance is measured |
| Dynamic Resistance (ZZ) | 10 Ω at IZT1 - determines regulation stiffness and output impedance in shunt regulator configurations |
| Temperature Coefficient (αVZ) | +0.060 %/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage (IR) | ≤3 μA at VR = 7 V - confirms low standby current in undervoltage or standby modes |
| Junction Temperature (Tj) | 150 °C maximum - sets upper thermal limit for reliability-critical applications |
Pinout & Package
SOD-123 surface-mount plastic package: 2.7 mm × 3.7 mm body, 1.55 mm lead pitch, cathode indicated by bar marking. Weight: 10.6 mg. UL 94 V-0 rated molding compound. MSL level 1 - unscreened floor life.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias configuration; forms return path for regulation current |
| Cathode | Zener breakdown terminal / regulated output node | Marked with bar; connected to higher-potential rail to enable controlled reverse conduction at 9.1 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter voltage reference accuracy than ±5 % variants without requiring trimming or calibration |
| Low dynamic resistance (10 Ω) | Minimizes output voltage variation under load transients in shunt regulator topologies |
| ESD robustness (HBM > 8 kV) | Reduces risk of handling damage during assembly and supports ruggedized industrial PCB handling |
| RoHS-compliant, commercial-grade construction | Meets environmental compliance requirements for consumer, computing, and industrial end equipment |
| Thermal resistance junction-to-ambient (420 K/W) | Supports predictable derating curves up to 125 °C ambient in compact layouts |
Applications
| Power Supply Feedback Loop | Analog Signal Clamping |
|---|---|
|
Use Scenario: Stabilizing output voltage in low-cost linear regulators or switching converter feedback networks. IC Role / Device Role / Timing Role: Zener diode acting as precision voltage reference node tied to error amplifier input. Use Value: Delivers 9.1 V reference with ±0.182 V tolerance and <10 Ω output impedance, enabling stable loop gain and minimal output ripple. |
Use Scenario: Protecting ADC inputs or op-amp rails from transient overvoltage events. IC Role / Device Role / Timing Role: Bidirectional clamping element limiting signal swing to safe levels relative to supply rails. Use Value: Clamps excursions above 9.1 V with fast response and ≤3 μA leakage below threshold - preserving signal integrity and input bias conditions. |
| Overvoltage Protection Circuit | Reference Voltage Generator |
|
Use Scenario: Safeguarding microcontroller I/O pins against ESD or surge-induced voltage spikes. IC Role / Device Role / Timing Role: Shunt protection device conducting excess energy to ground when voltage exceeds 9.1 V. Use Value: Activates at precisely defined threshold with low dynamic resistance to divert >20 mA safely, preventing latch-up or permanent damage. |
Use Scenario: Generating stable bias points for sensor signal conditioning or comparator thresholds. IC Role / Device Role / Timing Role: Passive voltage reference source independent of supply variations or load changes. Use Value: Provides 9.1 V reference with +0.060 %/°C drift - suitable for non-critical analog subsystems requiring <0.5 % total error over 0–70 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C9V1 | Same 9.1 V, ±2 %, SOD-523 package; lower Ptot = 300 mW but higher RthJA ≈ 500 K/W | Less thermal margin on FR-4; suited for space-constrained boards where footprint is priority over power headroom | Select BZX584C9V1 only if board area is critical and ambient temperature stays ≤60 °C |
| MMSZ5239B-E3-18 | Identical package and VZ, but ±5 % tolerance and slightly higher ZZ = 12 Ω | Acceptable where cost sensitivity outweighs precision needs; less stable under varying load or temperature | Choose MMSZ5239B-E3-18 for cost-driven consumer applications where ±5 % regulation is sufficient |
Compared with BZX584C9V1 and MMSZ5239B-E3-18, the MMSZ5239C-E3-18 offers superior voltage accuracy and thermal performance on standard FR-4, making it optimal for mid-precision industrial references and protection circuits where layout flexibility exists.
Availability
MMSZ5239C-E3-18 is available at Aetrix Electronics and suitable for power supply feedback loops, analog signal clamping, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for MMSZ5239C-E3-18 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, optoelectronics, and passive components for industrial, automotive, and computing markets.
The MMSZ52xx series targets cost-sensitive, space-constrained applications needing stable, low-power voltage regulation - designed for broad compatibility across consumer, industrial, and communications equipment.
FAQ
What is the zener voltage tolerance of MMSZ5239C-E3-18?
The MMSZ5239C-E3-18 has a nominal zener voltage of 9.1 V with a guaranteed tolerance of ±2 % at 25 °C and IZT1 = 20 mA. This tighter tolerance enables more accurate voltage referencing compared to ±5 % variants like the MMSZ5239B-E3-18, and is confirmed in the Vishay datasheet revision 1.1.
What package type does MMSZ5239C-E3-18 use?
The MMSZ5239C-E3-18 uses the SOD-123 surface-mount package: 2.7 mm × 3.7 mm body size, 1.55 mm lead pitch, cathode marked with a bar. It complies with JEDEC standards, has MSL level 1 rating, and weighs 10.6 mg - verified in Vishay's package drawing S8-V-3910.01-003.
Can MMSZ5239C-E3-18 be used in automotive applications?
The MMSZ5239C-E3-18 is RoHS-compliant and qualified for commercial temperature range (-55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive use, Vishay offers the MMSZ5239C-HE3_A-18 variant - the "C" suffix indicates ±2 % tolerance, while "HE3_A" denotes AEC-Q101 qualification.
What is the maximum power dissipation of MMSZ5239C-E3-18 on a standard FR-4 PCB?
The MMSZ5239C-E3-18 has a maximum power dissipation of 300 mW when mounted on an FR-4 board with the recommended soldering footprint per JEDEC 51-3. This value drops to 500 mW only under ideal lead-clamped thermal conditions - not typical in real-world PCB layouts.
How does the temperature coefficient affect MMSZ5239C-E3-18 performance?
The MMSZ5239C-E3-18 has a temperature coefficient of +0.060 %/°C, meaning its zener voltage increases by approximately 5.49 mV per °C rise in junction temperature. This positive drift must be accounted for in wide-temperature-range applications, especially above 70 °C ambient.
MMSZ5239C-E3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5239C-E3-18 FAQ
1.How can I place an order for MMSZ5239C-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5239C-E3-18 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 MMSZ5239C-E3-18 reliable?
The price and inventory of MMSZ5239C-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5239C-E3-18 is usually 5 days.
3.What payment methods are accepted for MMSZ5239C-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5239C-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5239C-E3-18?
MMSZ5239C-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5239C-E3-18 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 MMSZ5239C-E3-18?
For technical support, including MMSZ5239C-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5239C-E3-18 requirements.
6.How does Aetrix verify that MMSZ5239C-E3-18 is sourced from the original manufacturer or authorized distributors?
All MMSZ5239C-E3-18 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 MMSZ5239C-E3-18 meets industry standards.
7.What is the process for return or replacement of MMSZ5239C-E3-18?
All MMSZ5239C-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5239C-E3-18, 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 MMSZ5239C-E3-18 part is unused and in its original packaging.
Return procedure for MMSZ5239C-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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