My Inquiry
My Account
onsemi SZMMSZ5253ET1G
- Part No.:
- SZMMSZ5253ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ5253ET1G.pdf
- Description:
- DIODE ZENER 25V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,001
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMSZ5253ET1G from onsemi is a 25 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 35 Ω maximum dynamic impedance at 5.0 mA test current and 0.1 µA reverse leakage at 19 V, used for precision voltage reference and overvoltage protection in automotive power management circuits.
For engineers reviewing the SZMMSZ5253ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, and AEC-Q101 qualification status for under-hood electronics.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals when biased above VZ. Its 25 V nominal Zener voltage is specified at IZT = 5.0 mA with ±5% tolerance, and it exhibits a positive temperature coefficient above ~5 V, typical for mid-voltage Zeners.
The SOD-123 package provides low thermal resistance (RJL = 150 °C/W), enabling reliable operation up to +150 °C junction temperature. It supports automated placement and meets Class 3 ESD rating (>16 kV HBM), making it suitable for high-reliability automotive PCBs where space and robustness are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.75–26.25 V at IZT = 5.0 mA; ensures stable reference within ±5% tolerance for 12–24 V system monitoring. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C; requires thermal derating above 75 °C at 6.7 mW/°C for safe continuous operation. |
| Zener Impedance (ZZT) | ≤600 Ω at IZT = 5.0 mA; limits output voltage variation under load transients in feedback networks. |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 19 V; minimizes quiescent current in battery-backed or low-power sensing circuits. |
| Peak Surge Power (Ppk) | 225 W for 8 × 20 µs pulse; withstands common automotive load-dump and ISO 7637-2 transient events. |
| Junction Temp Range | −55 °C to +150 °C; qualified per AEC-Q101 for under-hood engine control and body electronics. |
Pinout & Package
SOD-123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm, void-free thermosetting plastic case with cathode band marking; designed for high-density automated assembly and reflow soldering at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to higher-potential node in reverse-bias configuration; polarity band identifies terminal for correct orientation during placement. |
| 2 (Non-banded End) | Anode | Connected to lower-potential node (e.g., ground or return path); completes reverse-biased conduction path for voltage regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and ADAS power supplies requiring PPAP documentation. |
| ESD Robustness | Class 3 HBM (>16 kV) enables handling without special ESD controls during manufacturing and field service. |
| Thermal Performance | RJL = 150 °C/W allows efficient heat transfer to PCB copper, supporting sustained operation near max ambient temperature. |
| Pb-Free Construction | RoHS-compliant SOD-123 package with corrosion-resistant finish, compatible with lead-free reflow profiles. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping of 24 V supply rail against load-dump transients in diesel ECU power input stage. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and transient suppressor in parallel with TVS diode and filter capacitor. Use Value: Maintains regulated 25 V reference while absorbing surge energy up to 225 W, preventing downstream LDO or MCU damage. | Use Scenario: Precision reference for 4–20 mA loop transmitter operating from 24 V industrial supply. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing stable bias point for op-amp current source circuitry. Use Value: ±5% VZ tolerance and low 0.1 µA leakage ensure accurate loop calibration across −40 °C to +125 °C ambient range. |
| Medical Infusion Pump Power Monitoring | Telecom DC-DC Converter Feedback |
Use Scenario: Overvoltage detection in battery-backed auxiliary power rail of Class II medical device. IC Role / Device Role / Timing Role: Zener-based comparator threshold element triggering shutdown when input exceeds 26.25 V. Use Value: Tight 23.75–26.25 V window and AEC-Q101 reliability support safety-critical fault response without drift. | Use Scenario: Secondary-side voltage sensing in isolated flyback converter for telecom base station power supply. IC Role / Device Role / Timing Role: Reference diode in optocoupler feedback network setting output regulation setpoint. Use Value: Low 600 Ω ZZT minimizes regulation error under dynamic load steps, improving cross-regulation stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5253ET1G | 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. |
| BZX84-C24LT1G | 24 V nominal, ±5% tolerance; 350 mW rating; SOT-23 package; higher ZZT (≤90 Ω @ 5 mA). | Lower power handling and different footprint; suited for space-constrained consumer PCBs, not under-hood environments. | Choose only if 24 V nominal matches design target and thermal margin permits reduced PD. |
Compared with MMSZ5253ET1G and BZX84-C24LT1G, SZMMSZ5253ET1G uniquely combines AEC-Q101 qualification, 500 mW power rating, and 25 V ±5% Zener voltage in SOD-123 - making it the sole option for automotive-grade 24 V system protection where traceable compliance and thermal resilience are mandatory.
Availability
SZMMSZ5253ET1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, and medical infusion pump power monitoring requiring stable component supply with full AEC-Q101 traceability.
Supply support for SZMMSZ5253ET1G 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.
SZMMSZ5253ET1G belongs to the SZMMSZ52xxET1G series - engineered specifically for automotive-grade voltage regulation, featuring enhanced process controls, extended temperature operation, and PPAP-ready documentation.
FAQ
What is the Zener voltage tolerance of SZMMSZ5253ET1G?
SZMMSZ5253ET1G has a nominal Zener voltage of 25 V with a standard tolerance of ±5%, resulting in a guaranteed range of 23.75 V to 26.25 V at IZT = 5.0 mA and TL = 30 °C. This tolerance is verified per AEC-Q101 test conditions and applies across the full operating temperature range of −55 °C to +150 °C.
Is SZMMSZ5253ET1G suitable for automotive applications?
Yes, SZMMSZ5253ET1G is AEC-Q101 qualified and PPAP capable, with process controls specific to automotive requirements. The "SZ" prefix denotes unique site and change control protocols required for automotive supply chains, and its SOD-123 package supports reflow profiles compliant with J-STD-020.
What is the maximum reverse leakage current for SZMMSZ5253ET1G?
The maximum reverse leakage current for SZMMSZ5253ET1G is 0.1 µA at VR = 19 V and TA = 25 °C. This value is measured per the datasheet's Electrical Characteristics table and remains stable across the full storage temperature range of −55 °C to +150 °C.
How does thermal derating work for SZMMSZ5253ET1G?
SZMMSZ5253ET1G is rated for 500 mW 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, ensuring safe operation without exceeding junction temperature limits.
What package type and dimensions does SZMMSZ5253ET1G use?
SZMMSZ5253ET1G uses the SOD-123 package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. It features a cathode band marking, Pb-free construction, and is rated for 260 °C soldering for 10 seconds - fully compatible with standard surface-mount assembly processes.
SZMMSZ5253ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 25 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 19 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
SZMMSZ5253ET1G FAQ
1.How can I place an order for SZMMSZ5253ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ5253ET1G 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 SZMMSZ5253ET1G reliable?
The price and inventory of SZMMSZ5253ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5253ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ5253ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5253ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ5253ET1G?
SZMMSZ5253ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ5253ET1G 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 SZMMSZ5253ET1G?
For technical support, including SZMMSZ5253ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5253ET1G requirements.
6.How does Aetrix verify that SZMMSZ5253ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ5253ET1G 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 SZMMSZ5253ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ5253ET1G?
All SZMMSZ5253ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5253ET1G, 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 SZMMSZ5253ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ5253ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMSZ5253ET1G Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
