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onsemi MMSZ5252ET1G
- Part No.:
- MMSZ5252ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5252ET1G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,403
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Product details
Overview
MMSZ5252ET1G 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 MMSZ5252ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, and HBM ESD rating for robustness in portable and industrial signal conditioning designs.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-biased voltage regulation. It achieves regulation via avalanche breakdown at nominal 24 V, with specified Zener impedance measured at 1 kHz AC superimposed on 5.2 mA DC bias (IZT).
Thermal performance is defined by junction-to-lead resistance of 150 °C/W and junction-to-ambient resistance of 340 °C/W, enabling predictable power derating above 75 °C. Its SOD-123 package supports automated placement and meets UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V (min) to 25.2 V (max) at IZT = 5.2 mA - defines regulated output range under nominal bias conditions |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board - sets maximum continuous operating power before thermal derating applies |
| Zener Impedance (ZZT) | ≤33 Ω at IZT = 5.2 mA, f = 1 kHz - determines output voltage stability under small-signal AC load variations |
| Leakage Current (IR) | ≤0.1 µA at VR = 18 V - ensures minimal parasitic current draw in standby or high-impedance sensing nodes |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - provides robustness against handling-induced electrostatic discharge |
| Peak Surge Power | 225 W for 20 µs pulse (8 × 20 µs waveform) - supports transient overvoltage clamping without failure |
| Junction Temp Range | −55 °C to +150 °C - enables operation in automotive under-hood and industrial ambient environments |
Pinout & Package
The MMSZ5252ET1G is housed in a surface-mount SOD-123 plastic package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm, with cathode indicated by a polarity band. The package is void-free, thermosetting, UL 94 V-0 rated, and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower potential reference; completes bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating on FR-5 board | Enables use in space-constrained PCBs without forced cooling while maintaining stable regulation up to 75 °C lead temperature |
| ±5% Zener voltage tolerance | Supports predictable voltage reference design without post-calibration in cost-sensitive consumer and industrial applications |
| ESD rating >16 kV (HBM) | Reduces need for external ESD protection in handheld and field-deployable electronics |
| SOD-123 package footprint | Facilitates high-density layout and compatibility with standard pick-and-place equipment for automated manufacturing |
| 150 °C maximum junction temperature | Allows reliable operation in thermally demanding environments such as automotive cabin modules and power supply feedback loops |
Applications
| Industrial Sensor Signal Conditioning | USB-C Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature and pressure transmitters. IC Role / Device Role / Timing Role: Zener diode providing precise 24 V rail clamp and low-drift reference for op-amp biasing. Use Value: Maintains <±0.5% reference accuracy across −40 °C to +85 °C due to tight 5% VZ tolerance and low ZZT. | Use Scenario: Clamping transient surges on VBUS line during hot-plug events in USB-C PD adapters. IC Role / Device Role / Timing Role: Standby-mode shunt protector absorbing 225 W surge pulses without degradation. Use Value: Survives repeated 8 × 20 µs surges up to 225 W, meeting IEC 61000-4-5 Level 3 requirements. |
| Automotive Cabin Control Module | Low-Power IoT Node Voltage Reference |
Use Scenario: Regulating 24 V supply rail for microcontroller I/O protection in HVAC control units. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting input voltage to safeguard 3.3 V LDO and MCU pins. Use Value: Operates reliably from −40 °C to +125 °C junction temperature, supporting AEC-Q101-compliant designs. | Use Scenario: Providing stable bias voltage for ultra-low-power comparators in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 µA at 18 V) voltage reference minimizing quiescent current drain. Use Value: Extends 10-year battery life in sealed sensor nodes by limiting standby current to sub-µA levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C24LT1G | Same 24 V nominal Zener voltage, but 300 mW rating and SOD-323 package (smaller footprint, higher thermal resistance) | Preferred for ultra-compact layouts where power dissipation ≤300 mW suffices; not suitable for sustained 500 mW loads | Select when board area is critical and thermal margin allows lower power rating |
| 1N4749A | Through-hole DO-41 package, 1 W rating, ±5% tolerance, 24 V nominal - larger size, higher power, no SMD compatibility | Used in legacy through-hole designs or prototyping where manual assembly is acceptable and higher surge capacity is needed | Select only for non-SMT builds or when 1 W continuous dissipation is required |
Compared with BZX584C24LT1G and 1N4749A, the MMSZ5252ET1G uniquely balances SMD manufacturability, 500 mW FR-5 board rating, and 150 °C junction capability - making it optimal for modern industrial and automotive PCBs requiring surface-mount reliability and thermal resilience.
Availability
MMSZ5252ET1G is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C protection circuits, and automotive cabin control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMSZ5252ET1G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon-based solutions for automotive, industrial, cloud, and intelligent power systems.
The MMSZ52xxET1G series belongs to onsemi's general-purpose Zener regulator product line, designed specifically for compact, high-reliability voltage reference and clamping in surface-mount applications across consumer, industrial, and automotive markets.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5252ET1G?
The MMSZ5252ET1G has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, meaning its actual reverse breakdown voltage falls between 22.8 V and 25.2 V when tested at IZT = 5.2 mA and TL = 30 °C ±1 °C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet. The MMSZ5252ET1G maintains this specification across its qualified operating temperature range.
What is the maximum power dissipation for the MMSZ5252ET1G on a standard PCB?
The MMSZ5252ET1G is rated for 500 mW total power dissipation on an FR-5 board at a lead temperature (TL) of 75 °C, with linear derating of 6.7 mW/°C above that temperature. This rating assumes use of the minimum recommended footprint (3.5 × 1.5 inches). The MMSZ5252ET1G must not exceed this limit to ensure long-term reliability and avoid thermal runaway.
Does the MMSZ5252ET1G meet automotive qualification standards?
Yes - the SZ-prefix variant SZMMSZ5252ET1G is AEC-Q101 qualified and PPAP capable for automotive applications. While the standard MMSZ5252ET1G is not automotive-qualified, it shares identical electrical and thermal specifications and is widely used in industrial and commercial designs. For automotive-grade assurance, the SZMMSZ5252ET1G must be specified; the MMSZ5252ET1G itself is intended for non-automotive applications unless explicitly validated.
What is the Zener impedance of the MMSZ5252ET1G and how is it measured?
The MMSZ5252ET1G has a maximum Zener impedance (ZZT) of 33 Ω, measured at IZT = 5.2 mA with a 1 kHz, 0.1 × IZT AC signal superimposed on the DC bias. This value reflects dynamic resistance during small-signal regulation and directly impacts output voltage stability under varying load conditions. The MMSZ5252ET1G's low ZZT supports precision reference applications where ripple rejection matters.
How is polarity identified on the MMSZ5252ET1G package?
The MMSZ5252ET1G uses a cathode band (a visible marking stripe) on the SOD-123 case to identify Pin 1 as the cathode terminal; Pin 2 is the anode. This polarity marking aligns with JEDEC-standard SOD-123 orientation and is verified in the mechanical drawings on page 6 of the onsemi datasheet. Correct orientation is essential - reverse connection prevents Zener operation and may cause circuit malfunction. The MMSZ5252ET1G must be mounted with the banded end toward the higher-potential node.
MMSZ5252ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
MMSZ5252ET1G FAQ
1.How can I place an order for MMSZ5252ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5252ET1G 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 MMSZ5252ET1G reliable?
The price and inventory of MMSZ5252ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5252ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5252ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5252ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5252ET1G?
MMSZ5252ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5252ET1G 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 MMSZ5252ET1G?
For technical support, including MMSZ5252ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5252ET1G requirements.
6.How does Aetrix verify that MMSZ5252ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5252ET1G 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 MMSZ5252ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5252ET1G?
All MMSZ5252ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5252ET1G, 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 MMSZ5252ET1G part is unused and in its original packaging.
Return procedure for MMSZ5252ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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