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onsemi SZMMBZ5252ELT1G
- Part No.:
- SZMMBZ5252ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5252ELT1G.pdf
- Description:
- DIODE ZENER 24V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
SZMMBZ5252ELT1G from onsemi is a 24 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, 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 compact DC power rails.
For engineers reviewing the SZMMBZ5252ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive environments.
Technical Context
This device operates as a two-terminal voltage regulator with fixed reverse breakdown behavior. Its 24 V nominal Zener voltage exhibits a positive temperature coefficient (~+8.5 mV/°C per typical curve data), and it maintains stable regulation under pulse conditions up to 225 W (8 × 20 µs) without degradation.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), polarity band marking, and Pb-free construction compliant with RoHS. It is qualified to AEC-Q101 for automotive use and supports automated surface-mount assembly.
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 tight 24 V ±5% regulation window for stable reference generation |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous DC power handling before thermal derating begins |
| Zener Impedance (ZZT) | 33 Ω at IZT = 5.2 mA - determines output voltage variation under load transients; lower value improves regulation fidelity |
| Leakage Current (IR) | 0.1 μA at VR = 18 V - ensures minimal standby current draw in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in manual assembly and field-replaceable modules |
| Junction Temp Range | −65°C to +150°C - supports operation in under-hood automotive and industrial ambient environments |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - informs PCB copper area requirements for thermal management at full power |
Pinout & Package
SZMMBZ5252ELT1G uses the standard SOT-23 (TO-236) plastic surface-mount package (2.90 × 1.30 × 1.00 mm), with cathode indicated by a polarity band. The package is void-free, thermosetting, UL 94 V-0 rated, and rated for 260°C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | DC input terminal for reverse-bias configuration; connects to lower-potential node in shunt regulator topology |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | DC output/reference terminal; connects to regulated voltage rail and provides Zener breakdown path to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring PPAP compliance |
| 225 mW Power Rating | Enables compact voltage clamping in space-constrained portable and IoT devices without external heat sinking |
| 33 Ω Zener Impedance | Delivers <±25 mV output shift across 1–10 mA load variations - suitable for precision analog reference circuits |
| ESD >16 kV (HBM) | Eliminates need for external ESD protection in handheld and wearable product interfaces |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and supports lead-free reflow profiles (JEDEC J-STD-020) |
Applications
| Automotive Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 24 V reference for analog front-end circuitry in wheel speed or pressure sensors mounted near engine compartments. IC Role / Device Role / Timing Role: Shunt voltage reference and transient suppressor - clamps supply excursions above 25.2 V while maintaining low quiescent current. Use Value: Enables reliable sensor output accuracy over −40°C to +125°C ambient, leveraging AEC-Q101 qualification and 150°C junction rating. |
Use Scenario: Protecting USB 2.0 data lines and VBUS rail from ESD events and accidental 24 V misconnection in docking stations. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor - conducts during overvoltage while preserving signal integrity below clamp threshold. Use Value: Replaces larger TVS arrays with single 2.9 mm × 1.3 mm component, meeting IEC 61000-4-2 Level 4 (±15 kV air) via inherent >16 kV HBM robustness. |
| Industrial PLC Input Protection | Medical Instrument Reference |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to inductive switching noise and surge transients. IC Role / Device Role / Timing Role: Fast-response shunt regulator - limits input voltage to ≤25.2 V during 1 kV/μs surges per IEC 61000-4-4. Use Value: Survives repeated 225 W (8 × 20 µs) pulses without parameter shift, verified per peak power rating and thermal design margin. |
Use Scenario: Generating stable 24 V reference for ADC biasing and calibration in portable ultrasound or patient monitor analog subsystems. IC Role / Device Role / Timing Role: Precision voltage reference - delivers <±0.5% initial tolerance and low tempco (<10 mV/°C) over medical operating range. Use Value: Achieves <±0.1% full-scale linearity in 16-bit measurement systems, enabled by 33 Ω ZZT and 0.1 μA leakage at 18 V. |
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-C24LT1G | 24 V ±5%, 300 mW rating, 70 Ω ZZT, non-AEC-Q101 | Higher power but looser regulation; suited for non-automotive industrial use | Select when higher continuous power (300 mW) is needed and AEC-Q101 is not required |
| SZBZX84C24LT1G | 24 V ±5%, 300 mW, 70 Ω ZZT, AEC-Q101 qualified | Same qualification as SZMMBZ5252ELT1G but higher ZZT and power | Choose when board layout allows larger thermal margin and tighter leakage is less critical than power headroom |
Compared with BZX84-C24LT1G and SZBZX84C24LT1G, SZMMBZ5252ELT1G offers superior regulation fidelity (33 Ω vs. 70 Ω ZZT) and lower leakage (0.1 μA vs. 0.5 μA), making it optimal for precision reference and low-power automotive sensing where voltage stability outweighs raw power capacity.
Availability
SZMMBZ5252ELT1G is available at Aetrix Electronics and suitable for automotive sensor modules, USB interface protection circuits, and industrial PLC input stages requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.
Supply support for SZMMBZ5252ELT1G 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.
SZMMBZ5252ELT1G belongs to the MMBZ52xx/SZMMBZ52xxELT1G Zener regulator family, designed specifically for space-constrained, high-reliability voltage reference and transient suppression in automotive and industrial edge electronics.
FAQ
What is the Zener voltage tolerance of SZMMBZ5252ELT1G?
The SZMMBZ5252ELT1G has a nominal Zener voltage of 24 V with a guaranteed tolerance of ±5%, corresponding to a minimum of 22.8 V and maximum of 25.2 V at IZT = 5.2 mA and TA = 25°C. This tight tolerance ensures predictable clamping behavior in safety-critical voltage monitoring circuits, and the specification is validated per onsemi's production test flow for every lot of SZMMBZ5252ELT1G.
Is SZMMBZ5252ELT1G suitable for automotive applications?
Yes, SZMMBZ5252ELT1G is AEC-Q101 qualified and PPAP capable, with full traceability and process controls aligned to automotive quality standards. Its −65°C to +150°C junction temperature range, >16 kV HBM ESD rating, and SOT-23 package reliability make it appropriate for engine control, ADAS sensor biasing, and body electronics where SZMMBZ5252ELT1G replaces legacy through-hole Zeners in high-density layouts.
What is the thermal resistance of SZMMBZ5252ELT1G on a standard PCB?
The thermal resistance from junction-to-ambient (RJA) for SZMMBZ5252ELT1G is 556 °C/W when mounted on an FR-5 board. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board); actual performance improves with added copper pour or thermal vias. Engineers must apply this RJA to calculate junction temperature rise in their specific layout when using SZMMBZ5252ELT1G at elevated ambient temperatures.
Does SZMMBZ5252ELT1G have a no-connect pin, and how should it be handled?
Yes, SZMMBZ5252ELT1G has Pin 2 designated as "No Connection" per its official pinout (1-Anode, 2-NC, 3-Cathode). This terminal is internally unconnected and must remain electrically floating - no PCB trace, pad, or grounding is permitted. Incorrect routing to ground or signal nets may cause functional failure or parametric deviation in SZMMBZ5252ELT1G operation.
How does the Zener impedance of SZMMBZ5252ELT1G affect its regulation performance?
The dynamic Zener impedance (ZZT) of SZMMBZ5252ELT1G is 33 Ω at IZT = 5.2 mA, directly determining how much the output voltage shifts under changing load current. For example, a 1 mA load variation causes only ~33 mV deviation - enabling high-accuracy references in analog signal chains. This low ZZT is confirmed in the Electrical Characteristics table of the official onsemi datasheet for SZMMBZ5252ELT1G.
SZMMBZ5252ELT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 225 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5252ELT1G FAQ
1.How can I place an order for SZMMBZ5252ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5252ELT1G 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 SZMMBZ5252ELT1G reliable?
The price and inventory of SZMMBZ5252ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5252ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5252ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5252ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5252ELT1G?
SZMMBZ5252ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5252ELT1G 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 SZMMBZ5252ELT1G?
For technical support, including SZMMBZ5252ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5252ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5252ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5252ELT1G 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 SZMMBZ5252ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5252ELT1G?
All SZMMBZ5252ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5252ELT1G, 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 SZMMBZ5252ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5252ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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