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onsemi SZMMBZ5252BLT1G
- Part No.:
- SZMMBZ5252BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5252BLT1G.pdf
- Description:
- DIODE ZENER 24V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,960
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Product details
Overview
SZMMBZ5252BLT1G from onsemi is a 24 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 5.2 mA test current, 33 Ω dynamic impedance at IZT, and 0.1 μA leakage at 18 V reverse bias - used for precision voltage clamping and reference in portable power rails.
For engineers reviewing the SZMMBZ5252BLT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode-anode polarity mapping, automotive-grade AEC-Q101 qualification status, and direct alternatives for voltage regulation in space-constrained designs.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias breakdown at nominal 24 V. Its 33 Ω Zener impedance at 5.2 mA ensures low output variation under load transients, while its −65 °C to +150 °C junction temperature range supports operation in automotive under-hood environments.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), polarity band marking, and UL 94 V-0 flammability rating. Thermal resistance is 556 °C/W on FR-5 board, enabling predictable derating to 1.8 mW/°C above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nom / 25.2 V max @ IZT = 5.2 mA - defines tight 5% tolerance band for accurate voltage clamping |
| Power Dissipation (PD) | 225 mW @ TA = 25 °C on FR-5 board - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZT) | 33 Ω @ IZT = 5.2 mA - determines output voltage stability under varying load current |
| Leakage Current (IR) | 0.1 μA @ VR = 18 V - confirms minimal standby current in pre-breakdown region |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - enables calculation of junction temperature rise under real PCB layout conditions |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness against electrostatic discharge during automated assembly and end-use |
| AEC-Q101 Qualified | Yes - validates suitability for automotive electronics requiring stress-tested reliability and PPAP compliance |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by polarity band; UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward current entry point; connected to lower-potential node in clamping configuration |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Zener breakdown terminal; tied to regulated voltage rail or protection node |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | SZ-prefix variant certified to AEC-Q101 with full PPAP support - meets Tier-1 automotive supply chain requirements |
| Pb-free, Halogen-free | RoHS-compliant construction with no lead, brominated flame retardants, or halogens - satisfies global environmental directives |
| High-density packaging | SOT-23 footprint enables placement on high-layer-count PCBs where board area is constrained, e.g., smartphone PMIC rails |
| ESD-hardened design | Class 3 HBM rating (>16 kV) eliminates need for external ESD protection in many consumer and industrial interfaces |
| Stable temperature coefficient | Typical TC near zero for 24 V grade - minimizes drift over −55 °C to +150 °C operating range |
Applications
| USB Power Delivery Clamp | Automotive Body Control Module |
|---|---|
|
Use Scenario: Clamping transient overvoltage on 20 V USB PD auxiliary power lines during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal passive voltage clamp protecting downstream LDOs and MCU I/O from >30 V spikes. Use Value: 24 V nominal Zener voltage provides 2 V margin above 20 V rail while maintaining <33 Ω dynamic impedance for fast response. |
Use Scenario: Providing stable 24 V reference for LIN bus transceiver biasing in door module ECUs. IC Role / Device Role / Timing Role: Precision shunt reference establishing clean local bias point independent of main 12 V battery fluctuations. Use Value: AEC-Q101 qualification and −65 °C to +150 °C operation ensure reliability across vehicle lifetime and environmental extremes. |
| Portable Medical Sensor Bias | Industrial PLC Input Protection |
|
Use Scenario: Supplying regulated bias voltage to analog front-end amplifiers in handheld glucose meters. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA @ 18 V) Zener reference stabilizing sensor excitation current sources. Use Value: Tight 5% VZ tolerance and 225 mW rating enable accurate, low-drift bias generation within 2.0 mm² SOT-23 footprint. |
Use Scenario: Protecting 24 V digital input channels from field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp absorbing repetitive 1 kV/μs transients before TVS diodes engage. Use Value: 33 Ω ZZT and Class 3 ESD rating allow it to absorb moderate energy without degradation, extending system-level surge life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5252BLT1G | Same Zener voltage (24 V), identical SOT-23 pinout and electrical specs, but not AEC-Q101 qualified | Targeted for commercial/industrial use only; lacks automotive change control and PPAP documentation | Select when automotive qualification is unnecessary and cost sensitivity favors standard-grade part |
| SZMMBZ5251BLT1G | 22 V nominal Zener voltage (20.9–23.1 V range), otherwise identical package, derating, and qualification | Used where 22 V clamping threshold better matches system overvoltage trip points or legacy design constraints | Choose when 22 V regulation aligns with existing reference architecture or tighter headroom is needed vs. 24 V rail |
Compared with MMBZ5252BLT1G, SZMMBZ5252BLT1G adds AEC-Q101 compliance and site-specific control for automotive programs, while SZMMBZ5251BLT1G offers a lower-voltage alternative within the same qualified family - enabling tiered selection based on voltage target and qualification scope.
Availability
SZMMBZ5252BLT1G is available at Aetrix Electronics and suitable for automotive body electronics, portable medical devices, industrial PLC inputs, and USB PD auxiliary power systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5252BLT1G 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 specializing in energy-efficient technologies for automotive, industrial, cloud, and IoT applications, with leadership in power management, signal processing, and sensing solutions.
SZMMBZ5252BLT1G belongs to the SZMMBZ52xxBLT1G automotive Zener regulator family, engineered to deliver AEC-Q101-qualified voltage reference and clamping performance in ultra-small SOT-23 packages for harsh-environment electronics.
FAQ
What is the Zener voltage tolerance of SZMMBZ5252BLT1G?
The SZMMBZ5252BLT1G has a Zener voltage range of 22.8 V (minimum) to 25.2 V (maximum) at IZT = 5.2 mA, corresponding to a ±5% tolerance around the nominal 24 V rating. This tolerance is guaranteed across the full operating temperature range and is validated per onsemi's AEC-Q101 stress testing protocol for the SZMMBZ5252BLT1G series.
Is SZMMBZ5252BLT1G pin-compatible with MMBZ5252BLT1G?
Yes, SZMMBZ5252BLT1G shares identical SOT-23 pinout (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode), mechanical dimensions, and soldering profile with MMBZ5252BLT1G. The only functional distinction is the SZ prefix denoting AEC-Q101 qualification, unique site control, and PPAP capability - making it a drop-in replacement where automotive compliance is required.
What is the maximum power dissipation of SZMMBZ5252BLT1G on a standard PCB?
SZMMBZ5252BLT1G is rated for 225 mW total power dissipation on FR-5 board at TA = 25 °C, with linear derating of 1.8 mW/°C above that ambient temperature. On alumina substrate, it supports up to 300 mW at 25 °C. These values are measured under defined board conditions and must be adjusted for actual copper area, layer count, and airflow in the final design.
Does SZMMBZ5252BLT1G require external heat sinking?
No, SZMMBZ5252BLT1G does not require external heat sinking under typical operating conditions. Its 556 °C/W junction-to-ambient thermal resistance on FR-5 board means that at 225 mW dissipation and 25 °C ambient, junction temperature reaches ~147 °C - within the −65 °C to +150 °C rating. Adequate PCB copper pour is sufficient for thermal management in most applications.
How is the cathode identified on SZMMBZ5252BLT1G?
The cathode of SZMMBZ5252BLT1G is marked by a distinct polarity band located adjacent to Pin 3 on the SOT-23 package. Per onsemi's mechanical drawings, Pin 1 is Anode, Pin 2 is No Connection, and Pin 3 is Cathode - confirmed in both the datasheet marking diagram and Case 318 Style 8 pinout definition.
SZMMBZ5252BLT1G 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:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5252BLT1G FAQ
1.How can I place an order for SZMMBZ5252BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5252BLT1G 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 SZMMBZ5252BLT1G reliable?
The price and inventory of SZMMBZ5252BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5252BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5252BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5252BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5252BLT1G?
SZMMBZ5252BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5252BLT1G 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 SZMMBZ5252BLT1G?
For technical support, including SZMMBZ5252BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5252BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5252BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5252BLT1G 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 SZMMBZ5252BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5252BLT1G?
All SZMMBZ5252BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5252BLT1G, 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 SZMMBZ5252BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5252BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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