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onsemi MMSZ5258BT3G
- Part No.:
- MMSZ5258BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5258BT3G.pdf
- Description:
- DIODE ZENER 36V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:75,886
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Product details
Overview
MMSZ5258BT3G from onsemi is a 36 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C ambient, with 3.4 mA test current (IZT), 70 Ω dynamic impedance (ZZT), and 0.1 µA leakage current at 27 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5258BT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 mechanical interface details, and validated alternative parts for voltage regulation design-in.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-biased breakdown at nominal 36 V. Its junction temperature range spans −55°C to +150°C, and it achieves thermal equilibrium under specified test conditions (TL = 30°C ±1°C).
It exhibits a positive temperature coefficient of +0.095 %/°C near 36 V, with typical capacitance of 10 pF at 50% VZ bias and forward voltage ≤0.95 V at 10 mA - enabling use in low-noise reference and transient suppression where predictable knee characteristics matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V (min) to 37.8 V (max) @ IZT = 3.4 mA - defines regulated output tolerance window for reference stability |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 70 Ω @ IZT = 3.4 mA - determines output voltage variation under load current changes |
| Leakage Current (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 control environments |
| ESD Rating | Class 3 (>16 kV HBM) - allows safe handling without special ESD precautions during assembly |
| Package | SOD−123 (1.60 × 2.69 × 1.16 mm) - enables high-density PCB layout with standard reflow compatibility |
Pinout & Package
SOD−123 surface-mount package with cathode indicated by polarity band; 2-terminal construction (anode/cathode only); void-free thermosetting plastic case rated UL 94 V−0; max soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased during normal operation |
| 2 (Anode) | Reference ground terminal | Tied to circuit common; establishes reference potential for Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating | Enables stable voltage clamping in space-constrained, low-power signal conditioning stages |
| ±5% Zener tolerance | Provides cost-effective precision for non-critical reference applications without trimming |
| ESD robustness >16 kV HBM | Eliminates need for external ESD protection in board-level input/output interfaces |
| Pb−Free construction | Meets RoHS compliance requirements for global electronics manufacturing |
| Thermal equilibrium specification | Ensures repeatable VZ measurement across production lots and temperature gradients |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener diode providing fixed 36 V reference for ratiometric ADC biasing. Use Value: Maintains <±1% reference drift over −40°C to +85°C ambient due to known TC and low ZZT. | Use Scenario: Clamping CAN transceiver supply rail against load-dump transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Overvoltage protector shunting surge energy above 36 V threshold. Use Value: Limits peak rail voltage to 37.8 V (max VZ) while surviving 100 ms pulses per ISO 7637-2. |
| Portable Medical Instrument Power Supervision | IoT Edge Node Battery Monitoring |
Use Scenario: Detecting undervoltage condition in lithium-polymer powered diagnostic handhelds. IC Role / Device Role / Timing Role: Precision Zener element in comparator-based brown-out detection circuit. Use Value: Triggers reset at 34.2 V (min VZ) with <0.1 µA quiescent current draw below threshold. | Use Scenario: Scaling battery voltage for ADC input in LPWAN sensor nodes with 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Voltage divider reference point ensuring accurate 0–3.3 V scaling across 3.0–4.2 V cell range. Use Value: Delivers <0.5% full-scale error due to tight 5% VZ tolerance and low IR at monitoring bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C36 | Same 36 V nominal, ±5% tolerance, but SOT-23 package (higher RJA = 450°C/W) | Lower power handling (300 mW) limits use in sustained clamp scenarios | Select when board space is tighter than thermal margin requirements |
| MMSZ5258CT3G | Identical SOD−123 package and 36 V nominal, but ±2% tolerance (tighter spec) | Higher cost; justified only where reference accuracy dominates BOM budget | Select when system-level calibration is impractical and initial VZ tolerance must be <±2% |
Compared with MMSZ5258BT3G, BZX584-C36 trades thermal performance for footprint reduction, while MMSZ5258CT3G improves voltage accuracy at higher unit cost - both require no PCB redesign but differ in thermal management and calibration strategy implications.
Availability
MMSZ5258BT3G is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and portable medical instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5258BT3G 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 supplier of energy-efficient semiconductor solutions, specializing in automotive, industrial, cloud, and IoT applications.
The MMSZ52xxxT1G series targets general-purpose, medium-current Zener regulation in compact surface-mount form factors - designed for cost-sensitive, high-volume applications needing reliable voltage reference or transient suppression without active circuitry.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5258BT3G?
The MMSZ5258BT3G has a nominal Zener voltage of 36 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 34.2 V and 37.8 V when measured at IZT = 3.4 mA and device junction in thermal equilibrium. This tolerance is confirmed in the onsemi datasheet's 5% FG Electrical Characteristics table and applies specifically to the "B" suffix variant.
What is the maximum power dissipation rating for MMSZ5258BT3G and under what conditions?
The MMSZ5258BT3G is rated for 500 mW total power dissipation on an FR−5 board at a lead temperature (TL) of 75°C. Power must be derated linearly above 75°C at 6.7 mW/°C, as defined in the Maximum Ratings table. This rating assumes proper PCB copper area and thermal relief per onsemi's recommended footprint.
Does MMSZ5258BT3G have automotive qualification and what does that mean for reliability?
Yes, the SZ-prefix variant (SZMMSZ5258BT3G) is AEC−Q101 qualified and PPAP capable, but the standard MMSZ5258BT3G is not automotive-qualified. The base part meets industrial reliability standards and shares identical electrical specs, yet lacks the extended stress testing and change control required for automotive deployment.
What is the Zener impedance (ZZT) of MMSZ5258BT3G and why does it matter in circuit design?
The MMSZ5258BT3G has a maximum Zener impedance (ZZT) of 70 Ω at IZT = 3.4 mA. This value quantifies how much the output voltage varies with changes in Zener current - lower ZZT means better regulation stability under varying load or supply conditions, critical for precision reference applications.
Can MMSZ5258BT3G be used in place of MMSZ5258CT3G, and what is the key difference?
No - MMSZ5258BT3G and MMSZ5258CT3G are not interchangeable without design review. Both share identical 36 V nominal voltage and SOD−123 package, but MMSZ5258BT3G has ±5% tolerance while MMSZ5258CT3G has tighter ±2% tolerance. Substituting the "B" for "C" version may cause reference inaccuracy beyond system specifications.
MMSZ5258BT3G 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5258BT3G FAQ
1.How can I place an order for MMSZ5258BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5258BT3G 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 MMSZ5258BT3G reliable?
The price and inventory of MMSZ5258BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5258BT3G is usually 5 days.
3.What payment methods are accepted for MMSZ5258BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5258BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5258BT3G?
MMSZ5258BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5258BT3G 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 MMSZ5258BT3G?
For technical support, including MMSZ5258BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5258BT3G requirements.
6.How does Aetrix verify that MMSZ5258BT3G is sourced from the original manufacturer or authorized distributors?
All MMSZ5258BT3G 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 MMSZ5258BT3G meets industry standards.
7.What is the process for return or replacement of MMSZ5258BT3G?
All MMSZ5258BT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5258BT3G, 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 MMSZ5258BT3G part is unused and in its original packaging.
Return procedure for MMSZ5258BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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