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onsemi MMSZ4711T1
- Part No.:
- MMSZ4711T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4711T1.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,842
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Product details
Overview
MMSZ4711T1 from onsemi is a 27 V nominal Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C, with 50 µA test current (IZT), 0.01 µA reverse leakage at 20.4 V, and ±5% voltage tolerance. It serves as a precision voltage reference or overvoltage clamp in low-power analog sensor interfaces and microcontroller reset circuits.
For engineers reviewing the MMSZ4711T1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 27 V Zener voltage with +1.35 V / −1.35 V tolerance, low 0.01 µA IR at VR = 20.4 V, thermal resistance of 340°C/W (Junction-to-Ambient), and SOD−123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias voltage regulation. Its 27 V nominal Zener voltage falls within the positive temperature coefficient region (> ~6 V), exhibiting a typical TC of +5.5 mV/°C per Figure 1 and Figure 4 of the datasheet.
The SOD−123 package enables automated placement and reflow soldering, with cathode polarity marked by a band. Thermal performance is defined for FR−5 board mounting, with derating starting above 75°C at 6.7 mW/°C and maximum junction temperature of +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V (min) to 28.35 V (max) at IZT = 50 µA - defines regulated output range under standard test conditions |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum continuous power handling before thermal derating |
| Reverse Leakage (IR) | 0.01 µA max at VR = 20.4 V - ensures minimal quiescent current in standby clamp applications |
| Thermal Resistance (RJA) | 340°C/W - determines junction temperature rise above ambient under load |
| Package | SOD−123 (1.60 × 2.69 × 1.16 mm) - surface-mount footprint compatible with high-density routing and automated assembly |
| Junction Temp Range | −55°C to +150°C - supports operation in extended industrial and automotive environments |
Pinout & Package
SOD−123 is a 2-lead surface-mount plastic package with cathode indicated by a polarity band. Dimensions are 1.60 mm × 2.69 mm × 1.16 mm (L × W × H). Lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower potential reference; forward conduction path when biased |
Key Features
| Feature | Design Value |
|---|---|
| Low IZT test current | 50 µA enables stable regulation in ultra-low-power monitoring circuits without loading sensitive sources |
| ESD robustness | Class 3 (>16 kV HBM) allows direct integration into exposed I/O protection paths without external ESD components |
| Pb−Free & RoHS | Compliant construction meets global environmental regulations and lead-free reflow process requirements |
| Automated assembly optimized | SOD−123 case geometry and marking support high-yield pick-and-place and AOI inspection |
Applications
| Voltage Reference for ADC Biasing | Microcontroller Reset Clamping |
|---|---|
Use Scenario: Providing stable 27 V reference to bias op-amp input stages in 12-bit analog front-ends. IC Role / Device Role / Timing Role: Precision Zener voltage source establishing fixed DC offset for signal conditioning. Use Value: Tight ±5% VZ tolerance and low 0.01 µA leakage ensure <0.02% reference error contribution at room temperature. |
Use Scenario: Clamping reset line voltage to prevent false triggering during 24 V industrial supply transients. IC Role / Device Role / Timing Role: Overvoltage protector limiting reset pin voltage to safe level below MCU absolute maximum rating. Use Value: 27 V Zener threshold provides 3 V margin above nominal 24 V rail while maintaining fast response to surges. |
| Sensor Supply Rail Regulation | Current Loop Transmitter Protection |
Use Scenario: Regulating excitation voltage for 4–20 mA pressure sensors operating from unregulated 30 V supply. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 27 V across sensor bridge elements. Use Value: 500 mW power rating supports up to 18.5 mA load current at full regulation without thermal shutdown. |
Use Scenario: Protecting HART modem ICs from induced surges on 4–20 mA loop wiring in factory automation. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping loop voltage during EFT events. Use Value: Low dynamic impedance (<100 Ω at 20 mA) ensures rapid clamping action with minimal overshoot during fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V nominal Zener, but SOT-23 package (higher RJA = 375°C/W); 250 mW rating | Limited to lower-power applications due to reduced power handling and higher thermal resistance | Select when board space permits SOT-23 and thermal budget allows ≤250 mW dissipation |
| MMSZ5254ET1G | 27 V nominal Zener in identical SOD−123 package, but 350 mW rating and higher IZT = 20 mA | Higher test current yields better regulation stability under varying load, but reduced max power vs. MMSZ4711T1 | Prefer when tighter dynamic regulation is required and peak power remains ≤350 mW |
Compared with BZX84-C27LT1G and MMSZ5254ET1G, the MMSZ4711T1 offers the highest power rating (500 mW) in the SOD−123 form factor among 27 V Zeners, enabling higher sustained current capability and superior thermal margin in compact industrial designs.
Availability
MMSZ4711T1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, and 4–20 mA loop protection requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant sourcing.
Supply support for MMSZ4711T1 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, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ4xxxT1G series was designed specifically for surface-mount voltage regulation in space-constrained, high-reliability applications-emphasizing low leakage, tight Zener tolerance, and robust ESD immunity in the SOD−123 package.
FAQ
What is the exact Zener voltage range for MMSZ4711T1 at 50 µA test current?
The MMSZ4711T1 has a guaranteed Zener voltage range of 25.65 V (minimum) to 28.35 V (maximum) when tested at IZT = 50 µA and TA = 25°C. This ±5% tolerance reflects the device's nominal 27 V rating and is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet.
Is MMSZ4711T1 suitable for use in automotive applications?
The MMSZ4711T1 itself is not AEC-Q101 qualified; however, the SZMMSZ4711T1G variant (with SZ prefix) is AEC-Q101 qualified and PPAP capable. For automotive-grade deployment, engineers must specify the SZ-prefixed part-MMSZ4711T1 is intended for industrial and commercial applications only.
What is the maximum reverse leakage current for MMSZ4711T1 and at what voltage is it specified?
The MMSZ4711T1 exhibits a maximum reverse leakage current (IR) of 0.01 µA, measured at VR = 20.4 V (80% of nominal VZ). This ultra-low leakage supports battery-powered and low-quiescent-current designs where standby power loss must be minimized.
Does MMSZ4711T1 have a specified temperature coefficient, and how does it affect regulation accuracy?
Yes-the MMSZ4711T1 (27 V nominal) has a positive temperature coefficient of approximately +5.5 mV/°C, as shown in Figure 1 of the datasheet. This means its Zener voltage increases linearly with temperature, requiring system-level compensation if regulation stability over −55°C to +150°C is critical.
Can MMSZ4711T1 be used in place of MMSZ4711T1G?
No-MMSZ4711T1 is a legacy non-Pb-free version; MMSZ4711T1G is the RoHS-compliant, Pb-free variant with identical electrical and mechanical specifications. The "G" suffix denotes lead-free packaging and is required for modern compliance. MMSZ4711T1 is obsolete and not recommended for new designs.
MMSZ4711T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 nA @ 20.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ4711T1 FAQ
1.How can I place an order for MMSZ4711T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4711T1 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 MMSZ4711T1 reliable?
The price and inventory of MMSZ4711T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4711T1 is usually 5 days.
3.What payment methods are accepted for MMSZ4711T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4711T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4711T1?
MMSZ4711T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4711T1 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 MMSZ4711T1?
For technical support, including MMSZ4711T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4711T1 requirements.
6.How does Aetrix verify that MMSZ4711T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ4711T1 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 MMSZ4711T1 meets industry standards.
7.What is the process for return or replacement of MMSZ4711T1?
All MMSZ4711T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4711T1, 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 MMSZ4711T1 part is unused and in its original packaging.
Return procedure for MMSZ4711T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ4711T1 Tags
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