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onsemi SZMMBZ5237BLT1G
- Part No.:
- SZMMBZ5237BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5237BLT1G.pdf
- Description:
- DIODE ZENER 8.2V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,900
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Product details
Overview
SZMMBZ5237BLT1G from onsemi is a surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation at 8.2 V nominal with ±5% tolerance, 225 mW power rating on FR-5 board, and 500 Ω dynamic impedance at 20 mA test current - used in overvoltage protection and reference circuits for portable electronics.
For engineers reviewing the SZMMBZ5237BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy (7.79–8.61 V), thermal resistance (556 °C/W), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility in space-constrained designs.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown above its specified Zener voltage while maintaining stable regulation across 1–20 mA operating current. Its cathode-anode polarity and NC terminal (Pin 2) are fixed per SOT-23 Style 8 mechanical outline.
The SZ prefix denotes automotive-grade qualification per AEC-Q101, with enhanced process control, traceability, and PPAP capability - distinct from commercial MMBZ5237BLT1G variants. It exhibits a positive temperature coefficient near 8.2 V, typical of mid-voltage Zeners in this series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79–8.61 V at IZT = 20 mA - defines regulated output range under standard test conditions |
| Power Dissipation | 225 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance (ZZT) | 500 Ω max at IZT = 20 mA - determines regulation stiffness and AC ripple rejection |
| Reverse Leakage (IR) | 3 μA max at VR = 6.5 V - ensures low standby current in undervoltage clamp applications |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld devices without external ESD protection |
| Operating Temperature | −65°C to +150°C - supports under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - validates reliability for automotive electronics per stress-test requirements |
Pinout & Package
SOT-23 (TO-236) package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; polarity band indicates cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during conduction |
| 2 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; voltage referenced to this terminal during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction enabling use in environmentally regulated markets without material declaration risk |
| Automotive Qualification | AEC-Q101 qualified with PPAP capability - eliminates requalification effort for Tier 1 automotive BOMs |
| High-Density Mounting | SOT-23 footprint allows placement in <1.5 mm² board area - critical for multi-rail power management in smartphones |
| ESD Robustness | Class 3 HBM (>16 kV) - reduces need for discrete TVS devices in USB/IO protection circuits |
| Thermal Performance | 556 °C/W junction-to-ambient on FR-5 - enables stable regulation up to 85°C ambient without heatsinking |
Applications
| USB Port Overvoltage Clamp | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Protects 5 V USB data/power lines from transient surges exceeding 5.5 V in portable accessories. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping excess voltage to ground via cathode connection. Use Value: Prevents damage to downstream USB transceivers with only 3 μA leakage at 6.5 V - minimizing standby power loss. |
Use Scenario: Provides stable 8.2 V reference for microcontroller ADC calibration and sensor biasing in HVAC control modules. IC Role / Device Role / Timing Role: Precision voltage reference source with ±5% tolerance and AEC-Q101 validation for functional safety compliance. Use Value: Maintains regulation stability across −40°C to +125°C ambient - eliminating need for external temperature compensation. |
| Smartphone Battery Monitor Circuit | Industrial PLC Input Protection |
Use Scenario: Scales battery voltage for fuel-gauge IC input using resistive divider anchored to 8.2 V Zener reference. IC Role / Device Role / Timing Role: Stable voltage reference node ensuring consistent ADC measurement accuracy across charge cycles. Use Value: 500 Ω Zener impedance minimizes divider loading error - improving SOC estimation resolution by ≥0.8%. |
Use Scenario: Clamps 24 V DC field inputs against ESD and load-dump transients in programmable logic controllers. IC Role / Device Role / Timing Role: Primary shunt protection element placed before optocoupler input stage. Use Value: >16 kV HBM rating withstands repeated contact discharge events - extending field unit MTBF beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5237BLT1G | Same electrical specs but commercial-grade; not AEC-Q101 qualified or PPAP capable | Lacks automotive traceability and stress-test validation - unsuitable for OEM vehicle programs | Select when cost sensitivity outweighs automotive compliance requirements |
| SZMMBZ5237BLT3G | Identical electrical and qualification specs; differs only in tape-and-reel quantity (10,000 vs. 3,000 units) | No functional difference - optimized for high-volume automated assembly lines requiring larger reels | Select for production runs >50k units to reduce reel changeovers and feeder downtime |
Compared with MMBZ5237BLT1G, SZMMBZ5237BLT1G adds automotive qualification and traceability at identical regulation performance; compared with SZMMBZ5237BLT3G, it offers smaller reel packaging for prototyping and low-volume builds without sacrificing spec compliance.
Availability
SZMMBZ5237BLT1G is available at Aetrix Electronics and suitable for automotive cabin electronics, portable device power management, and industrial I/O protection requiring stable component supply with full AEC-Q101 documentation and RoHS compliance.
Supply support for SZMMBZ5237BLT1G 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.
The MMBZ52xx/SZMMBZ52xx series was developed to provide compact, reliable Zener regulation for high-density portable and automotive electronics - prioritizing small footprint, ESD resilience, and qualification rigor.
FAQ
What is the Zener voltage tolerance for SZMMBZ5237BLT1G?
The SZMMBZ5237BLT1G has a Zener voltage range of 7.79 V to 8.61 V at 20 mA test current, corresponding to ±5% tolerance around the nominal 8.2 V value. This tolerance is verified per onsemi's Electrical Characteristics table and applies under standard 25°C ambient conditions. The SZMMBZ5237BLT1G maintains this specification across its qualified operating temperature range when used within derated power limits.
Is SZMMBZ5237BLT1G pin-compatible with MMBZ5237BLT1G?
Yes, SZMMBZ5237BLT1G shares identical SOT-23 pinout (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode), mechanical dimensions, and soldering profile with MMBZ5237BLT1G. However, SZMMBZ5237BLT1G includes additional automotive process controls and AEC-Q101 qualification - making it a drop-in replacement only where automotive compliance is required. The SZMMBZ5237BLT1G retains full functional equivalence in non-automotive applications.
What is the maximum reverse leakage current for SZMMBZ5237BLT1G?
The maximum reverse leakage current for SZMMBZ5237BLT1G is 3 μA at VR = 6.5 V and TA = 25°C, as specified in the Electrical Characteristics table. This value ensures minimal quiescent current draw in standby or undervoltage clamp configurations. The SZMMBZ5237BLT1G maintains leakage below 10 μA up to 85°C ambient, supporting low-power design goals in battery-operated systems.
Does SZMMBZ5237BLT1G require a heatsink in standard PCB layouts?
No, SZMMBZ5237BLT1G does not require an external heatsink when operated within its 225 mW power rating on FR-5 board at ≤25°C ambient. Its thermal resistance of 556 °C/W allows safe operation up to 85°C ambient with appropriate copper pour and trace width. The SZMMBZ5237BLT1G is engineered for self-cooled operation in typical 2-layer consumer and automotive PCBs without thermal vias or heatsinks.
How does the ESD rating of SZMMBZ5237BLT1G impact system-level design?
SZMMBZ5237BLT1G features Class 3 Human Body Model ESD rating (>16 kV), enabling direct placement at board edges or I/O interfaces without supplemental TVS devices. This simplifies layout, reduces BOM count, and improves surge immunity in handheld and automotive applications. The SZMMBZ5237BLT1G's ESD robustness is validated per AEC-Q101 test conditions, ensuring reliability across repeated electrostatic events in real-world deployment.
SZMMBZ5237BLT1G 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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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)
SZMMBZ5237BLT1G FAQ
1.How can I place an order for SZMMBZ5237BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5237BLT1G 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 SZMMBZ5237BLT1G reliable?
The price and inventory of SZMMBZ5237BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5237BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5237BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5237BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5237BLT1G?
SZMMBZ5237BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5237BLT1G 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 SZMMBZ5237BLT1G?
For technical support, including SZMMBZ5237BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5237BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5237BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5237BLT1G 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 SZMMBZ5237BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5237BLT1G?
All SZMMBZ5237BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5237BLT1G, 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 SZMMBZ5237BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5237BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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