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onsemi MMSZ5252ET1
- Part No.:
- MMSZ5252ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5252ET1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,334
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Product details
Overview
MMSZ5252ET1 from onsemi is a 24 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 5.2 mA test current (IZT), 33 Ω dynamic impedance (ZZT), and 0.1 µA leakage current at 18 V reverse bias - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5252ET1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, SOD-123 terminal mapping, and direct alternatives for voltage regulation design validation and BOM optimization.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 24 V, characterized under thermal equilibrium at TL = 30 °C ±1 °C. Its 33 Ω Zener impedance (ZZT) is measured at 1 kHz AC signal with IZ(AC) = 0.1 × IZT, ensuring stable regulation under small-signal perturbations.
The SOD-123 package provides 150 °C/W junction-to-lead thermal resistance and supports peak surge power of 225 W for 8 × 20 µs pulses. It features Class 3 ESD rating (>16 kV HBM) and UL 94 V-0 flammability compliance, enabling use in compact, high-reliability PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8–25.2 V @ IZT = 5.2 mA - defines regulated output voltage tolerance band for reference stability |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - maximum continuous power on FR-5 board before thermal derating begins |
| Zener Impedance (ZZT) | 33 Ω @ IZT = 5.2 mA, 1 kHz - indicates AC regulation stiffness; lower value improves ripple rejection |
| Leakage Current (IR) | 0.1 µA @ VR = 18 V - ensures minimal standby current draw in high-impedance bias networks |
| Junction Temp Range | −55 to +150 °C - enables operation in automotive under-hood and industrial control environments |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced electrostatic discharge during assembly |
Pinout & Package
SOD-123 surface-mount package: 2-pin, cathode-band marked, dimensions 1.60 × 2.69 × 1.16 mm, void-free thermosetting plastic case with UL 94 V-0 rating and corrosion-resistant solderable finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and clamp applications without external heatsinking on standard FR-5 PCB |
| ±5% Zener Tolerance | Supports cost-sensitive designs where tight voltage accuracy is not required, reducing calibration overhead |
| Low ZZK (600 Ω) | Ensures stable regulation even at low test current (IZK), critical for ultra-low-power biasing |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
| Automated Assembly Optimized | Small footprint and polarity band enable reliable pick-and-place placement and AOI inspection |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters operating in harsh factory environments. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 24 V bias to bridge sensor circuitry. Use Value: Maintains <±1% output drift across −40 to +85 °C ambient due to low temperature coefficient and robust thermal design. |
Use Scenario: Protecting USB 2.0 data line receivers from transient surges induced by hot-plug events or ESD. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor clamping VBUS to safe levels during fault conditions. Use Value: Limits peak clamping voltage to ≤27 V with 225 W surge capability, preserving PHY IC integrity per IEC 61000-4-2 Level 4. |
| Programmable Logic Controller Input Protection | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Safeguarding 24 V DC digital input channels against field-wiring faults and inductive kickback in PLC backplanes. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as shunt overvoltage limiter upstream of optocoupler input stage. Use Value: Absorbs >1000 surge events at 225 W without degradation, validated per AEC-Q101 stress protocols. |
Use Scenario: Generating a clean, temperature-stable reset threshold for 3.3 V microcontrollers in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in supervisor IC or discrete reset generator. Use Value: Delivers 24 V reference with <0.5% long-term drift over 10-year life, enabling reliable brown-out detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 | Same 24 V nominal Zener, but SOT-23 package (higher RJA = 350 °C/W); 600 mW rating at 25 °C only | Less thermal margin in high-density layouts; requires larger copper area for equivalent PD derating | Select when SOT-23 footprint compatibility is mandatory and board space allows thermal relief |
| MMBZ5252ELT1G | Identical electrical specs and SOD-123 package, but dual-diode configuration (cathode-common) in same outline | Not suitable for single-Zener applications; intended for bidirectional clamping or dual-rail referencing | Choose only if dual-channel functionality is required; otherwise MMSZ5252ET1 remains optimal single-device solution |
Compared with BZX84-C24 and MMBZ5252ELT1G, the MMSZ5252ET1 offers superior thermal performance in constrained layouts, guaranteed single-diode functionality, and tighter production lot consistency for high-volume industrial manufacturing.
Availability
MMSZ5252ET1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, PLC input safeguarding, and low-power microcontroller reset circuits requiring stable component supply and long-lifecycle support.
Supply support for MMSZ5252ET1 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxET1G series was engineered for high-reliability, surface-mount voltage regulation in space-constrained and thermally demanding environments - emphasizing manufacturability, ESD robustness, and consistent parametric yield.
FAQ
What is the Zener voltage tolerance for MMSZ5252ET1?
The MMSZ5252ET1 has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, resulting in a guaranteed range of 22.8 V to 25.2 V when measured at IZT = 5.2 mA and thermal equilibrium at TL = 30 °C ±1 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet for MMSZ5252ET1.
Can MMSZ5252ET1 be used in automotive applications?
Yes - the MMSZ5252ET1 is part of the SZMMSZ52xxET1G automotive-qualified series, meeting AEC-Q101 stress testing requirements and supporting PPAP documentation. While the base MMSZ5252ET1 is commercial-grade, its SZ-prefixed variant (SZMMSZ5252ET1G) is explicitly qualified for automotive use, including under-hood temperature cycling and humidity exposure.
What is the maximum surge power rating for MMSZ5252ET1?
The MMSZ5252ET1 supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs pulse waveform, as specified in the Maximum Ratings table. This rating applies at TL ≤ 25 °C and is validated per Figure 11 in the onsemi datasheet, making it suitable for transient suppression in industrial I/O protection circuits.
How does thermal derating affect MMSZ5252ET1's power handling?
MMSZ5252ET1 is rated for 500 mW total power dissipation at TL = 75 °C on FR-5 board, with linear derating of 6.7 mW/°C above that temperature. At 100 °C lead temperature, its usable power drops to 332.5 mW - a critical consideration for sealed enclosures or high-ambient industrial deployments where airflow is limited.
Is MMSZ5252ET1 RoHS-compliant and lead-free?
Yes - the "G" suffix in the full orderable part number MMSZ5252ET1G (the commercial version) denotes Pb-free construction, compliant with EU RoHS Directive 2011/65/EU. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1, supporting standard reflow profiles without special handling.
MMSZ5252ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 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
MMSZ5252ET1 FAQ
1.How can I place an order for MMSZ5252ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5252ET1 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 MMSZ5252ET1 reliable?
The price and inventory of MMSZ5252ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5252ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5252ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5252ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5252ET1?
MMSZ5252ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5252ET1 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 MMSZ5252ET1?
For technical support, including MMSZ5252ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5252ET1 requirements.
6.How does Aetrix verify that MMSZ5252ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5252ET1 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 MMSZ5252ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5252ET1?
All MMSZ5252ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5252ET1, 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 MMSZ5252ET1 part is unused and in its original packaging.
Return procedure for MMSZ5252ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5252ET1 Tags
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