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onsemi SZMMSZ5255ET1G
- Part No.:
- SZMMSZ5255ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5255ET1G.pdf
- Description:
- DIODE ZENER 28V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,603
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Product details
Overview
SZMMSZ5255ET1G from onsemi is a 28 V ±5% Zener voltage regulator diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 44 mA test current (IZT), 600 Ω maximum dynamic impedance (ZZT), and 0.1 µA reverse leakage at 21 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.
For engineers reviewing the SZMMSZ5255ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance (150 °C/W), ESD robustness (>16 kV HBM), and automotive qualification per AEC-Q101.
Technical Context
This device operates in reverse-biased Zener breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 28 V nominal Zener voltage is specified at IZT = 44 mA and TL = 30 °C, with a typical temperature coefficient near +0.085 %/°C for this voltage range.
The SOD-123 package enables automated surface-mount assembly while delivering 225 W nonrepetitive surge capability (8 × 20 µs pulse) and UL 94 V-0 flammability rating. Junction-to-ambient thermal resistance is 340 °C/W, limiting continuous operation without heatsinking to ambient temperatures below ~55 °C at full 500 mW rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.6–29.4 V @ IZT = 44 mA; defines clamping/reference level accuracy |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C on FR-5 board; sets max continuous DC power handling |
| Zener Impedance (ZZT) | ≤600 Ω @ IZT = 44 mA; determines output voltage stability under load variation |
| Leakage Current (IR) | ≤0.1 µA @ VR = 21 V; ensures minimal standby current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per HBM; supports robust handling in automated manufacturing |
| Thermal Resistance (RJL) | 150 °C/W junction-to-lead; enables direct thermal path to PCB copper for improved reliability |
| AEC-Q101 Qualified | Validated for automotive applications requiring PPAP documentation and site-controlled change control |
Pinout & Package
SOD-123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band. Maximum soldering temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-bias terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified with PPAP capability-enables use in engine control, body electronics, and ADAS subsystems |
| Pb-Free packaging | RoHS-compliant SOD-123 package with "G" suffix-meets global environmental compliance requirements |
| High surge robustness | 225 W peak power rating (8 × 20 µs) supports transient suppression in noisy environments |
| Low-leakage regulation | 0.1 µA IR @ 21 V enables stable biasing in micropower sensor interfaces and battery-backed circuits |
| Optimized for density | Small footprint (1.6 × 2.7 mm) supports high-density PCB layouts in space-constrained modules |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in temperature/humidity transmitters operating from 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing stable 28 V reference for op-amp gain-setting or DAC buffer biasing. Use Value: Tight ±5% VZ tolerance and low ZZT ensure <0.5% reference drift across 0–70 °C ambient range. | Use Scenario: Overvoltage protection for LIN bus transceivers and LED driver ICs exposed to load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Clamping diode placed between supply rail and ground to limit voltage excursions during ISO 7637-2 Pulse 5a events. Use Value: 225 W surge rating and AEC-Q101 qualification allow direct integration into automotive power domains without external TVS. |
| Medical Portable Diagnostic Device | IoT Edge Node Power Management |
Use Scenario: Providing regulated bias for photodiode amplifier stages in handheld pulse oximeters powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-leakage Zener reference establishing fixed bias point for transimpedance amplifier feedback network. Use Value: 0.1 µA IR at 21 V minimizes quiescent current draw, extending battery life beyond 12 months in sleep mode. | Use Scenario: Voltage clamping in energy-harvesting circuits using piezoelectric or solar cells with variable open-circuit outputs up to 35 V. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 28 V rail for ultra-low-power microcontrollers and BLE radios during intermittent charging cycles. Use Value: 500 mW continuous rating and 150 °C/W RJL enable passive thermal management on 2-layer FR-4 without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5255ET1G | No SZ prefix; not AEC-Q101 qualified; same electrical specs and SOD-123 package | Intended for commercial/industrial use only; lacks automotive change control and PPAP support | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| BZX84-C27LT1G | 27 V nominal Zener (±5%), 300 mW rating, SOT-23 package, 100 Ω ZZT @ 5 mA | Lower power and different impedance profile; suited for signal-level clamping rather than power regulation | Select for compact 27 V reference where 500 mW dissipation and 28 V precision are not required |
Compared with MMSZ5255ET1G and BZX84-C27LT1G, SZMMSZ5255ET1G uniquely combines automotive qualification, 500 mW power handling, and tight 28 V regulation-making it optimal for safety-critical or high-reliability 28 V reference/clamp roles where thermal margin and supply-chain traceability matter.
Availability
SZMMSZ5255ET1G is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body electronics, and medical diagnostic devices requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for SZMMSZ5255ET1G 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.
SZMMSZ5255ET1G belongs to the SZMMSZ52xxET1G series of AEC-Q101-qualified Zener regulators designed specifically for automotive and high-reliability industrial systems requiring controlled change management and PPAP documentation.
FAQ
What is the nominal Zener voltage and tolerance of SZMMSZ5255ET1G?
The nominal Zener voltage of SZMMSZ5255ET1G is 28 V with a standard tolerance of ±5%, corresponding to a guaranteed range of 26.6 V to 29.4 V when measured at IZT = 44 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The device achieves this specification using process-controlled doping and post-trim testing to meet automotive-grade consistency requirements.
Is SZMMSZ5255ET1G suitable for automotive applications?
Yes, SZMMSZ5255ET1G is explicitly AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific site and control change requirements. It meets stringent reliability, traceability, and documentation standards required for engine control units, body control modules, and ADAS subsystems. Its thermal performance (RJL = 150 °C/W) and surge rating (225 W) further support deployment in harsh automotive environments.
What is the maximum continuous power dissipation for SZMMSZ5255ET1G?
SZMMSZ5255ET1G has a maximum continuous power dissipation of 500 mW at TL = 75 °C on an FR-5 board with the minimum recommended footprint. Power must be linearly derated above 75 °C at 6.7 mW/°C, reaching zero at approximately 149 °C. This rating assumes proper PCB copper area and airflow; actual dissipation depends on layout, ambient temperature, and thermal interface to the board.
How does the Zener impedance of SZMMSZ5255ET1G affect voltage regulation stability?
SZMMSZ5255ET1G specifies a maximum Zener impedance (ZZT) of 600 Ω at IZT = 44 mA, which directly impacts regulation stability: lower ZZT yields smaller output voltage variation under changing load current. At 1 mA load step, this translates to ≤600 mV deviation-critical for precision references. The impedance is measured at 1 kHz with 0.1×DC current, reflecting real-world AC ripple rejection capability in filtering applications.
What packaging and marking details apply to SZMMSZ5255ET1G?
SZMMSZ5255ET1G uses the SOD-123 package (1.60 × 2.69 × 1.16 mm) with Pb-free construction and "G" suffix. Marking is "CD8" followed by a date code (e.g., "CD8M"), with cathode identified by a band. It ships in 3,000-piece tape-and-reel format per onsemi's BRD8011/D specification. The package complies with UL 94 V-0 and withstands 260 °C for 10 seconds during reflow soldering.
SZMMSZ5255ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 44 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
SZMMSZ5255ET1G FAQ
1.How can I place an order for SZMMSZ5255ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5255ET1G 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 SZMMSZ5255ET1G reliable?
The price and inventory of SZMMSZ5255ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5255ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5255ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5255ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5255ET1G?
SZMMSZ5255ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5255ET1G 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 SZMMSZ5255ET1G?
For technical support, including SZMMSZ5255ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5255ET1G requirements.
6.How does Aetrix verify that SZMMSZ5255ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5255ET1G 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 SZMMSZ5255ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5255ET1G?
All SZMMSZ5255ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5255ET1G, 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 SZMMSZ5255ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ5255ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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