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onsemi SZMMSZ5258BT3G
- Part No.:
- SZMMSZ5258BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5258BT3G.pdf
- Description:
- DIODE ZENER 36V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
SZMMSZ5258BT3G from onsemi is a 36 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 70 Ω dynamic impedance at 3.4 mA test current and 0.1 μA leakage at 27 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the SZMMSZ5258BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal equilibrium specification, AEC−Q101 qualification for automotive use, and Pb−free SOD−123 packaging compatible with automated assembly.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 36 V under thermal equilibrium conditions (TL = 30°C ±1°C). Its 70 Ω Zener impedance at IZT = 3.4 mA and 700 Ω at IZK = 0.25 mA defines regulation stability across load variations.
Designed for surface-mount applications, it features Class 3 ESD rating (>16 kV HBM), −55°C to +150°C junction temperature range, and UL 94 V−0 flammability compliance. The SOD−123 package enables high-density PCB layouts while maintaining 340°C/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V min / 36 V nom / 37.8 V max @ IZT = 3.4 mA - defines regulated output voltage window under thermal equilibrium |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance (ZZT) | 70 Ω @ IZT = 3.4 mA - determines voltage regulation sensitivity to current changes |
| Leakage Current (IR) | 0.1 μA @ VR = 27 V - ensures minimal parasitic current in standby or pre-breakdown states |
| Package | SOD−123 (Case 425) - 1.60 × 2.69 × 1.16 mm surface-mount footprint optimized for automated placement |
| Temperature Range | −55°C to +150°C - supports operation in under-hood automotive and industrial environments |
| AEC−Q101 Qualified | Yes - validated for automotive electronics per stress testing requirements |
Pinout & Package
SOD−123 package with cathode indicated by polarity band; 2-terminal construction (cathode/anode) requiring no external biasing circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased during regulation |
| 2 (Anode) | Reference/ground terminal | Tied to system ground or lower potential; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR−5 board | Enables stable voltage reference in space-constrained PCBs without forced cooling |
| ±5% Zener voltage tolerance | Supports cost-sensitive designs where tight regulation is balanced against BOM cost |
| Class 3 ESD protection (>16 kV HBM) | Reduces need for external ESD suppression in I/O interface circuits |
| AEC−Q101 qualification | Validates reliability for automotive body control modules and sensor interfaces |
| Pb−free SOD−123 package | Complies with RoHS and ELV directives; compatible with lead-free reflow profiles |
Applications
| Automotive Sensor Biasing | Industrial Analog Signal Clamping |
|---|---|
Use Scenario: Providing stable 36 V reference for Hall-effect position sensors in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference establishing sensor excitation voltage level. Use Value: Maintains sensor accuracy across −40°C to +125°C ambient with <±0.5% drift due to TC compensation. |
Use Scenario: Limiting input voltage to ADC front-end in programmable logic controller analog inputs. IC Role / Device Role / Timing Role: Overvoltage clamp protecting 3.3 V or 5 V ADC inputs from transient surges. Use Value: Absorbs up to 500 mW surge energy without latch-up, preserving signal chain integrity. |
| Consumer Power Supply Feedback | Medical Device Reference Stability |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for USB-C PD adapters. IC Role / Device Role / Timing Role: Precision feedback element setting output voltage via optocoupler bias. Use Value: Enables ±1% output regulation over line/load/temperature with minimal component count. |
Use Scenario: Stabilizing reference voltage for ECG amplifier gain stages in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-noise voltage reference ensuring DC offset stability in biopotential measurement paths. Use Value: Delivers <10 nA leakage and <70 Ω impedance to minimize baseline drift and common-mode error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5258BT3G | Same electrical specs but lacks AEC−Q101 qualification and SZ-prefix automotive traceability | Not approved for automotive production; suitable for industrial/commercial use only | Select when automotive qualification is unnecessary and cost is prioritized |
| SZMMBZ5258ET3G | Same 36 V Zener voltage but in SOT−23 package (higher thermal resistance: 400°C/W vs 340°C/W) | Lower power handling (350 mW vs 500 mW); requires larger copper area for thermal management | Choose only if SOT−23 footprint is mandated and derated power suffices |
Compared with MMSZ5258BT3G and SZMMBZ5258ET3G, SZMMSZ5258BT3G uniquely combines AEC−Q101 qualification, 500 mW SOD−123 power rating, and ±5% tolerance-making it the sole option for automotive-grade 36 V Zener regulation where both reliability and thermal performance are critical.
Availability
SZMMSZ5258BT3G is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog clamping, and medical device reference stability requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZMMSZ5258BT3G 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and consumer markets.
SZMMSZ5258BT3G belongs to the SZMMSZ52xxxT1G series of AEC−Q101-qualified Zener diodes designed specifically for automotive electronics requiring robust voltage regulation in harsh environments.
FAQ
What is the Zener voltage tolerance for SZMMSZ5258BT3G?
The SZMMSZ5258BT3G has a ±5% Zener voltage tolerance, meaning its nominal 36 V breakdown voltage is specified between 34.2 V and 37.8 V at IZT = 3.4 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet.
Is SZMMSZ5258BT3G qualified for automotive applications?
Yes, SZMMSZ5258BT3G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the onsemi datasheet. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, making SZMMSZ5258BT3G suitable for under-hood and chassis-mounted automotive systems.
What is the maximum power dissipation of SZMMSZ5258BT3G on FR−5 board?
SZMMSZ5258BT3G is rated for 500 mW total power dissipation on FR−5 board at a lead temperature (TL) of 75°C, with linear derating of 6.7 mW/°C above that temperature. This value is listed in the "MAXIMUM RATINGS" table on page 1 of the onsemi datasheet and applies to standard PCB layout with minimum recommended footprint.
What package type does SZMMSZ5258BT3G use?
SZMMSZ5258BT3G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm. The package features a cathode polarity band and is Pb−free, as confirmed in the "Mechanical Characteristics" and "ORDERING INFORMATION" sections of the onsemi datasheet.
What is the Zener impedance of SZMMSZ5258BT3G at its test current?
The dynamic Zener impedance (ZZT) of SZMMSZ5258BT3G is 70 Ω at IZT = 3.4 mA, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the onsemi datasheet. This value reflects AC impedance measured with IZ(AC) = 0.1 × IZ(DC) at 1 kHz frequency.
SZMMSZ5258BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 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
SZMMSZ5258BT3G FAQ
1.How can I place an order for SZMMSZ5258BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5258BT3G 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 SZMMSZ5258BT3G reliable?
The price and inventory of SZMMSZ5258BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5258BT3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5258BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5258BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5258BT3G?
SZMMSZ5258BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5258BT3G 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 SZMMSZ5258BT3G?
For technical support, including SZMMSZ5258BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5258BT3G requirements.
6.How does Aetrix verify that SZMMSZ5258BT3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5258BT3G 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 SZMMSZ5258BT3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5258BT3G?
All SZMMSZ5258BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5258BT3G, 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 SZMMSZ5258BT3G part is unused and in its original packaging.
Return procedure for SZMMSZ5258BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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