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onsemi SZMMBZ5236BLT1
- Part No.:
- SZMMBZ5236BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5236BLT1.pdf
- Description:
- DIODE ZENER 7.5V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:21,000
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Product details
Overview
SZMMBZ5236BLT1 from onsemi is a 7.5 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board and featuring 500 Ω maximum Zener impedance at 20 mA test current. It delivers precise voltage regulation with 0.25 μA reverse leakage at 6 V and supports automotive-grade reliability per AEC-Q101. This device is used for overvoltage protection and reference voltage generation in space-constrained portable electronics.
For engineers reviewing the SZMMBZ5236BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (7.5 V), dynamic impedance (≤500 Ω), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), and Pb-free SOT-23 packaging compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under varying load conditions. Its 7.5 V nominal Zener voltage is specified at 20 mA test current (IZT), with temperature coefficient optimized for minimal drift across −65°C to +150°C junction range.
The device features a no-connect (NC) terminal (Pin 2), enabling simplified layout in unidirectional clamp configurations. Its 225 mW power rating applies to standard FR-5 PCBs, while thermal resistance of 556 °C/W defines junction-to-ambient heat transfer limits under continuous DC operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.12–7.88 V at IZT = 20 mA; ensures ±5% regulation tolerance for precision reference use |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C; derates 1.8 mW/°C above ambient, limiting max continuous current to ~30 mA |
| Zener Impedance (ZZT) | ≤500 Ω at IZT = 20 mA; maintains low AC voltage variation during transient load changes |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 6 V; minimizes standby power loss in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; withstands handling and board-level electrostatic discharge without degradation |
| Junction Temp Range | −65°C to +150°C; supports operation in automotive under-hood and industrial environments |
Pinout & Package
Package: SOT-23 (Case 318, Style 8), surface-mount plastic case with corrosion-resistant finish; dimensions 2.90 mm × 1.30 mm × 1.00 mm (L × W × H); UL 94 V-0 flammability rating; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during Zener operation |
| 2 | No Connection | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode | Connected to higher-potential node; defines regulated output voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and infotainment power rails |
| Pb-Free Packaging | SZ prefix and "G" suffix denote RoHS-compliant construction with solderable finish |
| ESD Robustness | Withstands >16 kV HBM, eliminating need for external ESD protection in handheld designs |
| High-Density Mounting | SOT-23 footprint enables placement in <1.5 mm² board area, ideal for multi-rail portable PCBs |
Applications
| USB Power Rail Clamp | Smartphone Battery Monitor Reference |
|---|---|
Use Scenario: Clamping 5 V USB supply against surge events in portable accessories. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector between VBUS and GND. Use Value: 7.5 V breakdown prevents downstream LDO or USB controller damage while drawing <1 μA leakage at 5 V. |
Use Scenario: Providing stable reference voltage for fuel gauge ADC in lithium-ion battery packs. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end measurement circuitry. Use Value: ±5% VZ tolerance and low 500 Ω ZZT ensure <0.5% reference error across temperature and aging. |
| Automotive Cabin Controller Supply | IoT Sensor Node Voltage Regulator |
Use Scenario: Regulating 5 V microcontroller supply in HVAC control modules exposed to load dump transients. IC Role / Device Role / Timing Role: Secondary Zener regulator backing up primary DC-DC converter during fault conditions. Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability in under-dash environments. |
Use Scenario: Generating local 3.3 V bias for MEMS accelerometer and BLE radio in compact wireless sensors. IC Role / Device Role / Timing Role: Low-power shunt regulator replacing linear regulator where quiescent current is critical. Use Value: 0.25 μA leakage at 6 V enables >10-year battery life in coin-cell-powered nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C7V5 | Same 7.5 V nominal, but 350 mW rating and 600 Ω ZZT; not AEC-Q101 qualified | Lacks automotive qualification and has higher dynamic impedance; suitable only for commercial-grade consumer devices | Select when cost sensitivity outweighs automotive compliance and tighter impedance specs |
| MMSZ5236ET1G | Identical 7.5 V rating and 500 Ω ZZT, but 350 mW power rating and different SOD-123 package | Larger footprint and higher thermal mass; better for higher-current regulation but incompatible with SOT-23 layouts | Choose when board space allows larger package and higher power margin is required |
Compared with BZX84-C7V5 and MMSZ5236ET1G, SZMMBZ5236BLT1 uniquely combines AEC-Q101 qualification, SOT-23 miniaturization, and 500 Ω ZZT in a 225 mW-rated device-making it optimal for automotive and high-density portable designs where footprint, reliability, and impedance performance are jointly constrained.
Availability
SZMMBZ5236BLT1 is available at Aetrix Electronics and suitable for automotive cabin controllers, smartphone battery monitors, USB accessory clamps, and IoT sensor node voltage regulation requiring stable component supply across production lifecycles.
Supply support for SZMMBZ5236BLT1 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5236BLT1 belongs to the MMBZ52xxBLT1/SZMMBZ52xxBLT1G series of Zener regulators designed specifically for space-constrained, high-reliability voltage reference and overvoltage protection in automotive and portable electronics.
FAQ
What is the nominal Zener voltage of SZMMBZ5236BLT1 and how is it tested?
The nominal Zener voltage of SZMMBZ5236BLT1 is 7.5 V, measured at a test current (IZT) of 20 mA with ambient temperature at 25°C. The device guarantees a minimum of 7.12 V and maximum of 7.88 V under these conditions, reflecting a ±5% tolerance band essential for predictable voltage reference design. This specification is verified per onsemi's standardized pulse-test methodology to avoid self-heating errors.
Does SZMMBZ5236BLT1 have an AEC-Q101 qualification and what does that mean for automotive use?
Yes, SZMMBZ5236BLT1 is AEC-Q101 qualified and PPAP capable, confirming it meets stress-test requirements for automotive electronic components-including temperature cycling, humidity testing, and mechanical shock. This qualification validates its suitability for non-safety-critical automotive applications such as body control modules, infotainment power supplies, and cabin sensor interfaces where long-term reliability under thermal and vibration stress is mandatory.
What is the function of Pin 2 on SZMMBZ5236BLT1 and can it be connected to ground?
Pin 2 on SZMMBZ5236BLT1 is a no-connect (NC) terminal-internally isolated with no electrical function. It must remain unconnected on the PCB; grounding or routing it risks introducing parasitic capacitance or leakage paths that degrade Zener regulation accuracy and ESD performance. The official pinout (1-Anode, 2-NC, 3-Cathode) is confirmed in onsemi's datasheet Figure 6 and Package Dimensions section.
How does the 225 mW power rating of SZMMBZ5236BLT1 translate to practical current limits?
The 225 mW rating for SZMMBZ5236BLT1 applies to FR-5 board at 25°C ambient and derates linearly at 1.8 mW/°C above that temperature. At 25°C, this supports a maximum continuous Zener current of ~30 mA (225 mW ÷ 7.5 V). In practice, design margins typically limit operating current to ≤20 mA to ensure stability, longevity, and thermal safety-especially in enclosed or high-ambient-temperature environments.
Is SZMMBZ5236BLT1 compatible with lead-free reflow soldering processes?
Yes, SZMMBZ5236BLT1 is Pb-free and qualified for lead-free reflow soldering with a maximum case temperature of 260°C for 10 seconds, matching IPC/JEDEC J-STD-020 requirements. Its thermosetting plastic case and corrosion-resistant finish ensure reliable wetting and joint integrity during standard SAC305 profile reflow, making it suitable for high-volume automated assembly lines without special process adjustments.
SZMMBZ5236BLT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 6 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6 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)
SZMMBZ5236BLT1 FAQ
1.How can I place an order for SZMMBZ5236BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5236BLT1 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 SZMMBZ5236BLT1 reliable?
The price and inventory of SZMMBZ5236BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5236BLT1 is usually 5 days.
3.What payment methods are accepted for SZMMBZ5236BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5236BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5236BLT1?
SZMMBZ5236BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5236BLT1 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 SZMMBZ5236BLT1?
For technical support, including SZMMBZ5236BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5236BLT1 requirements.
6.How does Aetrix verify that SZMMBZ5236BLT1 is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5236BLT1 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 SZMMBZ5236BLT1 meets industry standards.
7.What is the process for return or replacement of SZMMBZ5236BLT1?
All SZMMBZ5236BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5236BLT1, 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 SZMMBZ5236BLT1 part is unused and in its original packaging.
Return procedure for SZMMBZ5236BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5236BLT1 Tags
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MM5Z5V1ST1G
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