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onsemi SZMMSZ5254BT1G
- Part No.:
- SZMMSZ5254BT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5254BT1G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:58,717
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Product details
Overview
SZMMSZ5254BT1G from onsemi is a 27 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C, with 4.6 mA test current (IZT), 41 Ω 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 circuits, power supply feedback loops, and ESD-protected sensor interfaces.
For engineers reviewing the SZMMSZ5254BT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 27 V nominal Zener voltage, ±5% tolerance, 41 Ω impedance at 4.6 mA, −55°C to +150°C operating range, and AEC−Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its Zener voltage is specified under thermal equilibrium conditions at TL = 30°C ±1°C, ensuring stable reference performance across temperature gradients. The 500 mW rating applies to FR−5 board mounting with defined footprint and trace width.
Thermal resistance from junction-to-ambient is 340°C/W, and junction-to-lead is 150°C/W - critical for derating calculations in compact PCB layouts. ESD robustness exceeds 16 kV (HBM Class 3), supporting reliable operation in handheld and automotive electronics without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V min / 27 V nominal / 28.35 V max @ IZT = 4.6 mA - defines tight regulation window for feedback sensing. |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C - sets maximum continuous DC power handling in standard PCB layout. |
| Zener Impedance (ZZT) | 41 Ω @ IZT = 4.6 mA - determines AC regulation stability and ripple rejection in reference circuits. |
| Reverse Leakage (IR) | 0.1 μA @ VR = 21 V - ensures minimal error current in high-impedance bias networks. |
| Operating Temperature | −55°C to +150°C - supports under-hood automotive, industrial control, and outdoor embedded applications. |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for discrete ESD protection in many I/O interface designs. |
| AEC−Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity, and mechanical stress testing. |
Pinout & Package
SOD−123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm body, cathode indicated by band, Pb−free, UL 94 V−0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; polarity must match PCB silkscreen to avoid reverse-bias failure. |
| 2 (Unbanded End) | Anode | Typically tied to ground or lower-potential rail; forms reference path for shunt regulation. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables stable voltage clamping in space-constrained 3.3 V/5 V rail monitoring without heatsinking. |
| ±5% Zener Tolerance | Supports cost-sensitive designs where tighter tolerance is unnecessary, reducing BOM cost vs. 2% variants. |
| SOD−123 Package | Facilitates automated placement and reflow on high-density boards; compatible with standard 0805 footprint tooling. |
| AEC−Q101 Qualification | Validates suitability for automotive infotainment, body control modules, and ADAS sensor signal conditioning. |
| 16 kV HBM ESD Robustness | Reduces risk of field failures in unshielded connectors or exposed I/O lines without added TVS devices. |
Applications
| Automotive Sensor Reference | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable 27 V reference for analog front-end of engine coolant temperature sensor in engine control unit. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining accuracy despite battery voltage fluctuations (9–16 V) and ambient temperature swings. Use Value: Enables <±1% measurement accuracy over −40°C to +125°C without trimming, leveraging AEC−Q101 reliability. |
Use Scenario: Regulating output voltage in isolated flyback converter feedback loop via optocoupler-coupled secondary-side sensing. IC Role / Device Role / Timing Role: Zener clamp defining precise threshold for TL431-like comparator input, setting 24 V output tolerance. Use Value: Achieves ±3% output regulation with 41 Ω dynamic impedance minimizing load-induced drift. |
| Portable Medical Device Clamp | IoT Node Overvoltage Protection |
Use Scenario: Protecting ADC input of wearable ECG monitor from transient spikes during electrode contact. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) shunt clamp limiting input to 28.35 V while preserving signal integrity. Use Value: Prevents ADC saturation without loading high-impedance biopotential amplifier (<1 pF capacitance). |
Use Scenario: Safeguarding 3.3 V microcontroller GPIO against 12 V accidental connection in smart home actuator module. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing surge energy before internal protection diodes activate. Use Value: Survives 16 kV HBM events and repetitive 21 V transients without degradation, extending field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5254BT1G | Same Zener voltage (27 V), same ±5% tolerance, but not AEC−Q101 qualified; no SZ prefix. | Intended for commercial/industrial use only; lacks automotive process controls and PPAP documentation. | Select when automotive qualification is unnecessary and cost sensitivity outweighs long-term reliability validation. |
| SZMMSZ5254CT1G | 27 V nominal with ±2% tolerance (tighter), same SOD−123 package, AEC−Q101 qualified. | Higher precision required in closed-loop feedback or calibration-critical instrumentation. | Choose when system-level accuracy demands <±1.5% total error budget, accepting ~15% higher unit cost. |
Compared with MMSZ5254BT1G, SZMMSZ5254BT1G adds automotive qualification and traceable sourcing, while SZMMSZ5254CT1G trades wider tolerance for tighter regulation - enabling design flexibility between cost, reliability, and precision tiers.
Availability
SZMMSZ5254BT1G is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power supply feedback loops, portable medical device clamping, and IoT node overvoltage protection requiring stable component supply across extended product lifecycles.
Supply support for SZMMSZ5254BT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SZMMSZ52xxxT1G series is designed for high-reliability voltage reference and clamping in automotive electronics, featuring AEC−Q101 qualification, Pb−free packaging, and optimized thermal performance in SOD−123.
FAQ
What is the nominal Zener voltage and tolerance of SZMMSZ5254BT1G?
The SZMMSZ5254BT1G has a nominal Zener voltage of 27 V with a tolerance of ±5%, meaning its actual Zener voltage falls between 25.65 V and 28.35 V when measured at IZT = 4.6 mA under thermal equilibrium conditions. This tolerance is confirmed in the onsemi datasheet's 5% tolerance electrical characteristics table and applies specifically to the SZMMSZ5254BT1G variant.
Is SZMMSZ5254BT1G qualified for automotive applications?
Yes, SZMMSZ5254BT1G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the onsemi datasheet features section. The "SZ" prefix denotes compliance with automotive-specific site and process controls, making SZMMSZ5254BT1G suitable for under-hood and chassis-mounted applications where reliability under thermal cycling and vibration is mandatory.
What is the maximum power dissipation of SZMMSZ5254BT1G and under what conditions?
SZMMSZ5254BT1G is rated for 500 mW total power dissipation on an FR−5 board at lead temperature (TL) = 75°C, with derating of 6.7 mW/°C above that temperature. This rating assumes the minimum recommended footprint and is validated per onsemi's thermal test methodology using infrared scanning - not ambient temperature alone.
What package type and dimensions does SZMMSZ5254BT1G use?
SZMMSZ5254BT1G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. The cathode is marked by a band on one end, and the device is Pb−free with UL 94 V−0 flammability rating - all confirmed in the mechanical outline and marking diagram sections of the official datasheet.
How does the ESD rating of SZMMSZ5254BT1G compare to standard requirements?
SZMMSZ5254BT1G achieves Class 3 HBM ESD rating (>16 kV), exceeding the 8 kV minimum typically required for industrial equipment and matching automotive I/O robustness standards. This eliminates the need for additional ESD protection components in many sensor interface and low-speed communication line applications, as verified in the datasheet features list.
SZMMSZ5254BT1G 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
SZMMSZ5254BT1G FAQ
1.How can I place an order for SZMMSZ5254BT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5254BT1G 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 SZMMSZ5254BT1G reliable?
The price and inventory of SZMMSZ5254BT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5254BT1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5254BT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5254BT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5254BT1G?
SZMMSZ5254BT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5254BT1G 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 SZMMSZ5254BT1G?
For technical support, including SZMMSZ5254BT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5254BT1G requirements.
6.How does Aetrix verify that SZMMSZ5254BT1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5254BT1G 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 SZMMSZ5254BT1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5254BT1G?
All SZMMSZ5254BT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5254BT1G, 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 SZMMSZ5254BT1G part is unused and in its original packaging.
Return procedure for SZMMSZ5254BT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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