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onsemi MMSZ5235BT1
- Part No.:
- MMSZ5235BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5235BT1.pdf
- Description:
- DIODE ZENER 6.8V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,799
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Product details
Overview
MMSZ5235BT1 from ON Semiconductor is a 500 mW, ±5% tolerance Zener diode in SOD−123 package, with nominal Zener voltage of 6.8 V at 20 mA test current, dynamic impedance of 5 Ω at IZT, and leakage current ≤0.25 µA at 3 V reverse bias. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the MMSZ5235BT1 datasheet, pinout, applications, or equivalent options, this device is selected for stable 6.8 V regulation under thermal equilibrium conditions (TL = 30°C), ESD robustness (>16 kV HBM), and compatibility with automated SMT assembly on FR-4/FR-5 boards.
Technical Context
This Zener diode operates in reverse breakdown mode with specified parameters measured at thermal equilibrium (TL = 30°C ±1°C), ensuring stable voltage reference performance independent of transient self-heating. Its 500 mW power rating is defined at TL = 75°C with 6.7 mW/°C derating above that temperature.
The device exhibits low dynamic impedance (5 Ω @ 20 mA) and tight 5% voltage tolerance, enabling accurate clamping and reference functions in space-constrained designs. Its SOD−123 package supports high-density PCB layouts and meets UL 94 V−0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V @ IZT = 20 mA - defines precise clamping threshold for voltage regulation |
| Power Dissipation | 500 mW on FR-5 board @ TL = 75°C - sets maximum continuous power handling in standard layout |
| Zener Impedance (ZZT) | 5 Ω @ IZT = 20 mA - ensures minimal voltage variation under load current changes |
| Leakage Current (IR) | ≤0.25 µA @ VR = 3 V - guarantees negligible standby current in low-power monitoring circuits |
| Thermal Resistance (RJA) | 340 °C/W - determines junction temperature rise under ambient conditions without heatsinking |
| ESD Rating | Class 3 (>16 kV HBM) - provides robustness against electrostatic discharge during handling and assembly |
| Junction Temperature Range | −55°C to +150°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), void-free thermosetting construction with corrosion-resistant, solderable finish; cathode indicated by polarity band; maximum soldering temperature 260°C for 10 seconds; UL 94 V−0 rated.
| 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 | Typically tied to system ground or feedback reference point; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR-5 board | Enables reliable voltage regulation in compact PCB footprints without forced cooling |
| ±5% Zener voltage tolerance | Meets cost-sensitive precision reference needs without requiring post-manufacture trimming |
| ESD robustness >16 kV (HBM) | Eliminates need for external ESD protection in board-level handling and field deployment |
| Pb-free SOD−123 package | Complies with RoHS and ELV directives while maintaining full solderability and thermal performance |
| Optimized for automated assembly | Standardized footprint and polarity marking support high-yield pick-and-place and reflow processes |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler feedback networks. IC Role / Device Role / Timing Role: Shunt reference providing stable 6.8 V threshold to TL431 or similar error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to low ZZT and thermal stability. |
Use Scenario: Protecting microcontroller I/O pins from transient surges in industrial sensor interfaces. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage to 7.14 V before damage occurs to downstream logic. Use Value: Prevents latch-up or gate oxide breakdown with sub-10 ns response and <0.25 µA leakage at operating bias. |
| Low-Power Reference | Temperature-Stable Biasing |
Use Scenario: Generating precision bias for op-amp comparators in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-current Zener reference supplying stable 6.8 V to high-impedance divider networks. Use Value: Delivers <10 ppm/°C drift over −40°C to +85°C, minimizing calibration drift in field-deployed units. |
Use Scenario: Setting collector current in discrete transistor amplifiers used in automotive cabin sensors. IC Role / Device Role / Timing Role: Provides temperature-compensated base bias via series resistor to BJT emitter. Use Value: Compensates for VBE drift using matched TC characteristics, stabilizing gain across operating temperature range. |
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-C6V8 | Same 6.8 V nominal, ±5% tolerance, but 300 mW rating and SOD-323 package (smaller footprint, higher RJA = 450 °C/W) | Lower power handling limits use in >15 mA regulation paths; smaller size suits ultra-dense layouts | Select when board area is critical and peak power remains below 300 mW |
| MMSZ4687T1G | 6.8 V nominal, ±5%, but rated for 350 mW and exhibits 10 Ω ZZT @ 20 mA (double MMSZ5235BT1's impedance) | Higher impedance reduces regulation accuracy under dynamic load steps; lower power rating restricts thermal margin | Choose only for cost-sensitive, non-critical biasing where 5 Ω ZZT is not required |
Compared with BZX584-C6V8 and MMSZ4687T1G, MMSZ5235BT1 delivers superior regulation accuracy (5 Ω vs. 10–15 Ω ZZT) and higher thermal capacity (500 mW vs. 300–350 mW), making it preferred for stable reference and moderate-power clamp roles where long-term voltage consistency matters.
Availability
MMSZ5235BT1 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and low-power reference applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for MMSZ5235BT1 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The MMSZ5235BT1 belongs to the MMSZ52xxxT1G Zener regulator series, designed specifically for high-reliability, surface-mount voltage reference and clamping in space-constrained, thermally demanding applications.
FAQ
What is the nominal Zener voltage and tolerance of MMSZ5235BT1?
The MMSZ5235BT1 has a nominal Zener voltage of 6.8 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 6.46 V and 7.14 V when tested at IZT = 20 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 ON Semiconductor datasheet.
What is the maximum power dissipation rating for MMSZ5235BT1?
MMSZ5235BT1 is rated for 500 mW total power dissipation on an 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 the SOD−123 mechanical drawing and does not require heatsinking in typical PCB layouts.
Does MMSZ5235BT1 meet automotive qualification standards?
No - MMSZ5235BT1 is not AEC-Q101 qualified. The SZ-prefix variants (e.g., SZMMSZ5235BT1G) are the automotive-grade versions meeting AEC-Q101 and PPAP requirements. The standard MMSZ5235BT1 is intended for commercial and industrial applications, though it shares identical electrical specs and SOD−123 packaging.
What is the Zener impedance of MMSZ5235BT1 and why does it matter?
MMSZ5235BT1 has a maximum Zener impedance (ZZT) of 5 Ω at IZT = 20 mA. This low dynamic impedance ensures minimal voltage deviation when load current fluctuates - critical for maintaining regulation accuracy in feedback loops and precision reference circuits where even small ΔIZ must produce <35 mV ΔVZ.
How is polarity identified on the MMSZ5235BT1 SOD−123 package?
MMSZ5235BT1 uses a cathode band to indicate polarity: the banded end (Pin 1) is the cathode, and the unmarked end (Pin 2) is the anode. This marking aligns with the mechanical diagram on page 7 of the datasheet and is visible under standard optical inspection, ensuring correct orientation during automated placement and manual rework.
MMSZ5235BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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
MMSZ5235BT1 FAQ
1.How can I place an order for MMSZ5235BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235BT1 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 MMSZ5235BT1 reliable?
The price and inventory of MMSZ5235BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5235BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5235BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235BT1?
MMSZ5235BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235BT1 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 MMSZ5235BT1?
For technical support, including MMSZ5235BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235BT1 requirements.
6.How does Aetrix verify that MMSZ5235BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5235BT1 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 MMSZ5235BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5235BT1?
All MMSZ5235BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235BT1, 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 MMSZ5235BT1 part is unused and in its original packaging.
Return procedure for MMSZ5235BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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