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onsemi SZMMSZ5258BT1G
- Part No.:
- SZMMSZ5258BT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5258BT1G.pdf
- Description:
- DIODE ZENER 36V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
SZMMSZ5258BT1G from onsemi is a 36 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C with 70 Ω dynamic impedance at 3.4 mA test current, used for precision voltage regulation and overvoltage protection in low-power analog circuits and power supply feedback loops.
For engineers reviewing the SZMMSZ5258BT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal equilibrium specification, junction-to-lead thermal resistance (150 °C/W), and AEC−Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed to maintain stable reverse breakdown voltage under controlled thermal equilibrium conditions (TL = 30°C ±1°C). Its Zener voltage is specified at IZT = 3.4 mA with ZZT = 70 Ω and exhibits IR ≤ 0.1 µA at VR = 27 V.
The SOD−123 package enables automated surface-mount assembly and supports FR−4/FR−5 board mounting with 260°C soldering tolerance. It features Class 3 ESD rating (>16 kV HBM) and Pb−free construction compliant with RoHS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V min / 36 V nominal / 37.8 V max @ IZT = 3.4 mA - defines regulated output voltage range 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 - indicates voltage regulation stability under small-signal AC perturbation |
| Reverse Leakage (IR) | ≤ 0.1 µA @ VR = 27 V - ensures minimal standby current in high-impedance bias networks |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial environments |
| Thermal Resistance (RJL) | 150 °C/W - determines temperature rise per watt from junction to lead, critical for PCB copper pour design |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased during regulation; carries full Zener current |
| 2 (Anode) | Reference ground terminal | Typically tied to circuit common; establishes reference potential for Zener voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Class 3 ESD rating | Withstands >16 kV human-body-model discharge without parameter shift or failure |
| Thermal equilibrium spec | Zener voltage measured at TL = 30°C ±1°C, enabling repeatable calibration in production test |
| Pb−free & RoHS compliant | Meets global environmental regulations; compatible with lead-free reflow profiles up to 260°C |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable reference voltage for analog sensor signal conditioning in engine coolant temperature sensors. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt voltage reference in op-amp bias network. Use Value: Maintains 36 V regulation tolerance within ±5% across −40°C to +125°C ambient, ensuring sensor accuracy over full vehicle operating range. |
Use Scenario: Setting feedback threshold in isolated DC-DC converter secondary-side error amplifier. IC Role / Device Role / Timing Role: Shunt regulator defining output voltage setpoint via optocoupler input current. Use Value: Low 70 Ω ZZT minimizes output voltage drift under load transients, improving regulation accuracy to ±1.5%. |
| Medical Instrument Reference | Consumer Audio Protection |
Use Scenario: Generating stable bias for low-noise instrumentation amplifier in portable ECG front-end. IC Role / Device Role / Timing Role: Precision voltage clamp limiting input stage overvoltage during electrode contact faults. Use Value: ≤0.1 µA leakage at 27 V prevents signal path loading, preserving >120 dB CMRR in differential amplification. |
Use Scenario: Overvoltage clamping on headphone amplifier output to protect connected devices. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing ESD events and power rail spikes. Use Value: Class 3 ESD rating (>16 kV HBM) withstands repeated electrostatic discharges without degradation in audio fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5258BT1G | No SZ prefix; not AEC−Q101 qualified; identical electrical specs and SOD−123 package | Intended for commercial/industrial use only; lacks automotive change control and PPAP documentation | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| SZMMSZ5258CT1G | ±2% Zener voltage tolerance (35.28–36.72 V); same 36 V nominal, 70 Ω ZZT, and AEC−Q101 rating | Used where tighter regulation is required, e.g., precision ADC reference or closed-loop control setpoints | Select when system-level voltage accuracy demands <±3% total error budget |
Compared with SZMMSZ5258BT1G, MMSZ5258BT1G offers identical performance without automotive qualification, while SZMMSZ5258CT1G provides tighter 2% tolerance at same voltage and thermal specs-enabling trade-offs between cost, qualification, and precision.
Availability
SZMMSZ5258BT1G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power supplies, medical instrumentation, and consumer audio protection requiring stable component supply with AEC−Q101 compliance and traceable sourcing.
Supply support for SZMMSZ5258BT1G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions.
SZMMSZ52xxxT1G series is part of onsemi's automotive-qualified Zener regulator portfolio, engineered for reliable voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance for SZMMSZ5258BT1G?
The SZMMSZ5258BT1G has a ±5% Zener voltage tolerance, meaning its nominal 36 V breakdown voltage is guaranteed between 34.2 V and 37.8 V when measured under thermal equilibrium conditions (TL = 30°C ±1°C) at IZT = 3.4 mA. This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet for SZMMSZ5258BT1G.
Is SZMMSZ5258BT1G suitable for automotive applications?
Yes, SZMMSZ5258BT1G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific site and process controls. It meets stringent reliability requirements for under-hood and chassis-mounted ECUs, including extended temperature operation (−55°C to +150°C) and robust ESD immunity (>16 kV HBM). These attributes are explicitly stated in the Features section of the onsemi datasheet for SZMMSZ5258BT1G.
What is the maximum power dissipation for SZMMSZ5258BT1G on FR-5 board?
The maximum power dissipation for SZMMSZ5258BT1G is 500 mW on FR−5 board at lead temperature (TL) = 75°C, with linear derating of 6.7 mW/°C above that temperature. This rating assumes the minimum recommended footprint per onsemi's mechanical specifications and is documented in the "MAXIMUM RATINGS" table on page 1 of the SZMMSZ5258BT1G datasheet.
Does SZMMSZ5258BT1G have a specified Zener impedance?
Yes, SZMMSZ5258BT1G has a maximum Zener impedance (ZZT) of 70 Ω measured at IZT = 3.4 mA with 1 kHz AC signal (IZ(AC) = 0.1 × IZ(DC)). This value reflects dynamic resistance during small-signal regulation and is critical for maintaining voltage stability under varying load conditions. It is listed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet for SZMMSZ5258BT1G.
What packaging and marking format does SZMMSZ5258BT1G use?
SZMMSZ5258BT1G is supplied in SOD−123 package (Case 425, Style 1) with Pb−free construction and tape-and-reel shipping (3,000 units per reel). Its marking code is "M3", visible as a laser-etched or molded identifier on the cathode end of the device body. Polarity is indicated by a cathode band, and the "G" suffix confirms RoHS compliance - all details confirmed in the Ordering Information and Marking Diagram sections of the onsemi datasheet for SZMMSZ5258BT1G.
SZMMSZ5258BT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- 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
SZMMSZ5258BT1G FAQ
1.How can I place an order for SZMMSZ5258BT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5258BT1G 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 SZMMSZ5258BT1G reliable?
The price and inventory of SZMMSZ5258BT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5258BT1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5258BT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5258BT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5258BT1G?
SZMMSZ5258BT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5258BT1G 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 SZMMSZ5258BT1G?
For technical support, including SZMMSZ5258BT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5258BT1G requirements.
6.How does Aetrix verify that SZMMSZ5258BT1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5258BT1G 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 SZMMSZ5258BT1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5258BT1G?
All SZMMSZ5258BT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5258BT1G, 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 SZMMSZ5258BT1G part is unused and in its original packaging.
Return procedure for SZMMSZ5258BT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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