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onsemi MMSZ5254ET1G
- Part No.:
- MMSZ5254ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5254ET1G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,980
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Product details
Overview
MMSZ5254ET1G from onsemi is a 27 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 4.6 mA test current (IZT), 41 Ω dynamic impedance (ZZT), and 0.1 µA leakage current at 21 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5254ET1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, SOD-123 terminal mapping, ESD robustness (Class 3, >16 kV HBM), and direct alternatives for voltage regulation in space-constrained PCBs.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load or line conditions. Its 27 V nominal Zener voltage is specified at IZT = 4.6 mA with ±5% tolerance, and it exhibits a temperature coefficient near zero in the 24–30 V range per onsemi's typical TC curves.
Thermal design relies on junction-to-lead resistance of 150 °C/W and junction-to-ambient resistance of 340 °C/W; power derating begins above 75 °C at 6.7 mW/°C. Peak surge capability reaches 225 W for 8 × 20 µs pulses, supporting transient suppression in DC rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65–28.35 V @ IZT = 4.6 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - maximum continuous power on FR-5 board before thermal derating applies |
| Zener Impedance (ZZT) | 41 Ω @ IZT = 4.6 mA - indicates voltage regulation stability under small-signal AC variations |
| Leakage Current (IR) | 0.1 µA @ VR = 21 V - ensures minimal standby current draw below breakdown threshold |
| ESD Rating | Class 3 (>16 kV) per HBM - supports handling without special ESD controls in assembly |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm) - surface-mount footprint optimized for automated placement and high-density routing |
| Operating Temp | −55 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
SOD-123 is a 2-lead surface-mount plastic package with cathode indicated by a polarity band. The case is void-free, thermosetting, UL 94 V-0 rated, and solderable at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and clamp applications without heatsinking on standard FR-5 boards |
| ±5% Zener Voltage Tolerance | Provides predictable regulation accuracy for non-critical voltage references and feedback networks |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in final assembly and field deployment |
| 225 W Surge Capability | Withstands common transient events like EFT and capacitive discharge without degradation |
| Pb-Free Construction | Meets RoHS compliance requirements and supports lead-free reflow soldering profiles |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Zener diode providing fixed 27 V reference for op-amp biasing and ADC reference scaling. Use Value: Maintains <±0.5% output variation over −40 °C to +85 °C ambient, enabling 12-bit measurement repeatability. | Use Scenario: Clamping 24 V CAN bus power rail against load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Shunt regulator absorbing surge energy up to 225 W for 8 × 20 µs pulses. Use Value: Prevents downstream LDO and MCU damage while maintaining <100 ns response time to overvoltage events. |
| Medical Portable Diagnostic Device Reference | Consumer IoT Battery Management Protection |
Use Scenario: Generating stable bias for photodiode amplifier in handheld pulse oximeter front-end. IC Role / Device Role / Timing Role: Precision Zener reference ensuring consistent gain calibration across production units. Use Value: Delivers 27 V ±5% with 41 Ω dynamic impedance, reducing signal drift to <0.2% FS over battery discharge cycle. | Use Scenario: Overvoltage protection for Li-ion charging IC input in smart speaker power stage. IC Role / Device Role / Timing Role: Reverse-biased shunt element clamping input to 28.35 V max during adapter fault conditions. Use Value: Limits peak stress on charging controller to within absolute maximum ratings, extending reliability beyond 10,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C27 | Same 27 V nominal Zener, but 300 mW rating and SOD-323 package (smaller footprint, higher thermal resistance) | Lower power handling limits use in >10 mA regulation paths; better suited for ultra-compact wearables | Select when board area is constrained and peak current stays below 3.7 mA |
| SZMMBZ5254ET1G | Automotive-grade variant (AEC-Q101 qualified), identical electrical specs and SOD-123 package | Required for automotive BOMs needing PPAP documentation and extended temperature validation | Select when qualifying for automotive Tier-1 supply chain or under-hood placement |
Compared with MMSZ5254ET1G, BZX584-C27 trades power capability for size, while SZMMBZ5254ET1G adds automotive qualification without altering electrical behavior - enabling drop-in replacement where AEC-Q101 compliance is mandatory.
Availability
MMSZ5254ET1G is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive voltage clamping, and portable medical device reference applications requiring stable component supply and full traceability.
Supply support for MMSZ5254ET1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxET1G series is part of onsemi's general-purpose Zener diode portfolio, designed for cost-sensitive, space-constrained voltage regulation and protection in consumer, industrial, and automotive electronics.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5254ET1G?
The MMSZ5254ET1G has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, corresponding to a guaranteed range of 25.65 V to 28.35 V when measured at IZT = 4.6 mA and thermal equilibrium at 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.
What is the maximum power dissipation for MMSZ5254ET1G on a standard PCB?
The MMSZ5254ET1G is rated for 500 mW total power dissipation on an FR-5 board at a lead temperature (TL) of 75 °C. Above that temperature, power must be linearly derated at 6.7 mW/°C, reaching zero dissipation at approximately 149 °C lead temperature - values verified in the Maximum Ratings table on page 1 of the datasheet.
Does MMSZ5254ET1G have automotive qualification?
The standard MMSZ5254ET1G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5254ET1G shares identical electrical and mechanical specifications and is fully AEC-Q101 qualified with PPAP capability. That variant is intended for automotive applications requiring certified reliability and change control.
What is the Zener impedance of MMSZ5254ET1G and why does it matter?
The MMSZ5254ET1G has a maximum Zener impedance (ZZT) of 41 Ω at IZT = 4.6 mA and 1 kHz AC signal. This value reflects how tightly the device regulates voltage under small dynamic load changes - lower impedance means less output voltage variation, critical for stable reference generation in precision analog circuits using the MMSZ5254ET1G.
How is polarity marked on the MMSZ5254ET1G SOD-123 package?
The MMSZ5254ET1G uses a cathode band to indicate polarity: Pin 1 (cathode) is the banded end of the SOD-123 body, and Pin 2 (anode) is the opposite, unmarked end. This marking aligns with the mechanical outline diagram on page 6 of the datasheet and is essential for correct reverse-bias orientation during PCB layout and assembly.
MMSZ5254ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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
MMSZ5254ET1G FAQ
1.How can I place an order for MMSZ5254ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5254ET1G 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 MMSZ5254ET1G reliable?
The price and inventory of MMSZ5254ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5254ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5254ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5254ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5254ET1G?
MMSZ5254ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5254ET1G 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 MMSZ5254ET1G?
For technical support, including MMSZ5254ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5254ET1G requirements.
6.How does Aetrix verify that MMSZ5254ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5254ET1G 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 MMSZ5254ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5254ET1G?
All MMSZ5254ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5254ET1G, 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 MMSZ5254ET1G part is unused and in its original packaging.
Return procedure for MMSZ5254ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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