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onsemi SZMMSZ5254ET1G
- Part No.:
- SZMMSZ5254ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5254ET1G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:27,200
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Product details
Overview
SZMMSZ5254ET1G 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 SZMMSZ5254ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, ESD robustness (Class 3, >16 kV HBM), 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. It exhibits a nominal Zener voltage of 27 V with ±5% tolerance, measured at IZT = 4.6 mA under thermal equilibrium at TL = 30 °C ±1 °C.
Its electrical behavior is characterized by low dynamic impedance (ZZT = 41 Ω at IZT), tight leakage control (IR ≤ 0.1 µA at VR = 21 V), and a temperature coefficient near zero crossing in the 24–28 V range - enabling stable reference performance across −55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65–28.35 V (±5% tolerance at IZT = 4.6 mA; defines regulated output voltage window) |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board; derates 6.7 mW/°C above 75 °C |
| Zener Impedance (ZZT) | 41 Ω max at IZT = 4.6 mA; determines AC regulation stability under load transients |
| Leakage Current (IR) | ≤0.1 µA at VR = 21 V; ensures minimal standby power loss in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; supports robust handling in automated assembly |
| Junction Temp Range | −55 °C to +150 °C; enables operation in automotive under-hood and industrial control environments |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm); surface-mount compatible with standard reflow profiles |
Pinout & Package
SOD-123 package with cathode indicated by polarity band; 2-terminal construction (anode/cathode), void-free thermosetting plastic case, UL 94 V-0 flammability rating, and maximum soldering temperature of 260 °C for 10 seconds.
| 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 rail; completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Pb-Free Construction | RoHS-compliant SOD-123 package with corrosion-resistant, easily solderable finish |
| High Surge Robustness | 225 W nonrepetitive peak power capability (8 × 20 µs pulse) for transient suppression |
| Thermal Performance | Junction-to-lead thermal resistance (RJL) = 150 °C/W enables efficient heat transfer to PCB copper |
| Small Footprint | 1.60 × 2.69 mm outline supports high-density layout in space-constrained IoT sensor nodes |
Applications
| Industrial Sensor Signal Conditioning | Automotive Cabin Control Module |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in temperature/humidity sensor front-ends. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing stable 27 V bias to op-amp gain stages and ADC reference dividers. Use Value: Maintains <±0.5% reference drift over −40 °C to +85 °C ambient due to low TC and tight VZ tolerance. | Use Scenario: Overvoltage clamp protecting microcontroller I/O pins from load-dump transients in HVAC control units. IC Role / Device Role / Timing Role: Fast-acting shunt protector triggered at 28.35 V (max VZ), diverting surge energy before downstream IC damage. Use Value: Withstands 225 W surge pulses and recovers within microseconds without parameter shift or degradation. |
| Medical Wearable Power Management | Smart Meter Reference Subsystem |
Use Scenario: Providing isolated 27 V reference for battery-charger feedback loop in portable ECG monitors. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 µA) Zener reference ensuring <1 µA quiescent current in sleep mode. Use Value: Enables >7-day battery life in coin-cell-powered devices while maintaining ±0.1% regulation accuracy. | Use Scenario: Generating stable calibration reference for metrology-grade voltage measurement circuits. IC Role / Device Role / Timing Role: Primary shunt reference in dual-op-amp buffer configuration driving precision DACs and comparators. Use Value: 41 Ω ZZT ensures <0.05% line regulation error under 100 µA load variation across 25–85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5254ET1G | No SZ prefix; not AEC-Q101 qualified; identical electrical specs and SOD-123 package | Targeted for commercial/industrial use only; lacks automotive PPAP documentation | Select when AEC-Q101 compliance is unnecessary and cost sensitivity is higher |
| BZX84-C27LT1G | 27 V ±5%, SOT-23 package, 350 mW rating, 70 Ω ZZT at 5 mA, 100 nA IR at 21 V | Smaller footprint but lower power and higher impedance; suited for ultra-low-current biasing | Select when board space is critical and power dissipation remains below 350 mW |
Compared with MMSZ5254ET1G and BZX84-C27LT1G, SZMMSZ5254ET1G uniquely combines AEC-Q101 qualification, 500 mW power capability, and 41 Ω low-impedance regulation - making it optimal for automotive and industrial systems requiring both reliability and precision.
Availability
SZMMSZ5254ET1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and smart meter reference subsystems requiring stable component supply and long-term lifecycle support.
Supply support for SZMMSZ5254ET1G 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.
SZMMSZ5254ET1G belongs to the SZMMSZ52xxET1G series - engineered for high-reliability voltage regulation in harsh-environment applications where AEC-Q101 qualification, thermal robustness, and tight parametric control are mandatory.
FAQ
What is the Zener voltage tolerance of SZMMSZ5254ET1G?
SZMMSZ5254ET1G has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, resulting in a guaranteed range of 25.65 V to 28.35 V at IZT = 4.6 mA and thermal equilibrium at TL = 30 °C ±1 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.
Is SZMMSZ5254ET1G suitable for automotive applications?
Yes, SZMMSZ5254ET1G is AEC-Q101 qualified and PPAP capable, with an SZ prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its −55 °C to +150 °C junction temperature range and 225 W surge rating support under-hood and cabin control module deployment.
What is the maximum power dissipation for SZMMSZ5254ET1G on a standard PCB?
SZMMSZ5254ET1G delivers 500 mW total power dissipation on FR-5 board at TL = 75 °C, derating linearly at 6.7 mW/°C above that temperature. This rating assumes the minimum recommended footprint (3.5 × 1.5 inches) and is specified in the Maximum Ratings table on page 1 of the datasheet.
How does the Zener impedance of SZMMSZ5254ET1G affect regulation performance?
SZMMSZ5254ET1G has a maximum Zener impedance (ZZT) of 41 Ω at IZT = 4.6 mA, directly determining its ability to maintain stable output voltage under varying load currents. Lower ZZT minimizes voltage deviation during transients - critical for precision reference and feedback loop stability in power supplies and sensor interfaces.
What packaging and marking information applies to SZMMSZ5254ET1G?
SZMMSZ5254ET1G uses the SOD-123 package (Case 425, Style 1), marked "CD7" on the cathode-banded end, with Pb-free construction and date code "M". The cathode is identified by a polarity band; mechanical dimensions are 1.60 × 2.69 × 1.16 mm, per the outline drawing on page 7 of the datasheet.
SZMMSZ5254ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ5254ET1G FAQ
1.How can I place an order for SZMMSZ5254ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5254ET1G 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 SZMMSZ5254ET1G reliable?
The price and inventory of SZMMSZ5254ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5254ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5254ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5254ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5254ET1G?
SZMMSZ5254ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5254ET1G 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 SZMMSZ5254ET1G?
For technical support, including SZMMSZ5254ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5254ET1G requirements.
6.How does Aetrix verify that SZMMSZ5254ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5254ET1G 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 SZMMSZ5254ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5254ET1G?
All SZMMSZ5254ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5254ET1G, 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 SZMMSZ5254ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ5254ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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