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onsemi SZMMBZ5235BLT1G
- Part No.:
- SZMMBZ5235BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5235BLT1G.pdf
- Description:
- DIODE ZENER 6.8V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:30,653
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Product details
Overview
SZMMBZ5235BLT1G from onsemi is a 6.8 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 5 Ω dynamic impedance at 20 mA test current and 3 μA leakage current at 5 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZMMBZ5235BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOT-23 footprint compatibility in space-constrained designs.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable reverse-biased regulation. Its 6.8 V nominal Zener voltage exhibits low temperature coefficient near zero crossing, enabling stable performance across −65°C to +150°C junction range.
The SOT-23 package supports automated placement and reflow soldering at 260°C for 10 seconds. Pin 2 is internally unconnected - confirmed by mechanical outline Style 8 and electrical characteristics table - eliminating risk of unintended node coupling in layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V @ 20 mA - ensures tight 6.8 V ±5% regulation for 3.3 V/5 V rail clamping and reference generation. |
| Power Dissipation | 225 mW on FR-5 board - defines maximum continuous power handling without derating below 25°C ambient. |
| Zener Impedance (ZZT) | 5 Ω @ IZT = 20 mA - indicates low AC impedance for stable regulation under dynamic load transients. |
| Leakage Current (IR) | 3 μA @ VR = 5 V - confirms minimal standby current draw in battery-powered systems. |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust electrostatic immunity for handheld and automotive interface circuits. |
| Junction Temp Range | −65°C to +150°C - supports operation in 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 body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish. Cathode marked by band on terminal 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation; must be routed with low-inductance path to ground or return. |
| 2 | No Connection | Floating terminal - no internal bond wire; must remain unconnected in PCB layout to avoid parasitic coupling. |
| 3 | Cathode | Connected to regulated voltage node; carries full Zener current; requires thermal relief if copper pour used. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free, RoHS Compliant | Meets global environmental compliance mandates without compromising solderability or thermal performance. |
| Automated Assembly Optimized | SOT-23 footprint and marking design support high-yield pick-and-place and reflow processes. |
| High-Density Packaging | 2.9 mm × 1.3 mm footprint enables placement in tight spaces on mobile and wearable PCBs. |
| UL 94 V-0 Flammability Rating | Ensures flame-retardant behavior in end equipment meeting safety certification requirements. |
| Stable Zener Voltage Tolerance | ±5% tolerance at 20 mA enables predictable clamping without post-production trimming. |
Applications
| USB Power Protection | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamping transient surges on 5 V USB VBUS lines in portable accessories. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing overvoltage events above 6.8 V. Use Value: Prevents damage to downstream USB controllers using only 225 mW dissipation and <5 Ω impedance. |
Use Scenario: Providing stable 6.8 V reference for analog sensor signal conditioning in engine control modules. IC Role / Device Role / Timing Role: Precision voltage reference source with AEC-Q101 qualification and −65°C to +150°C operation. Use Value: Maintains accuracy across wide temperature swings without external compensation circuitry. |
| IoT Node Voltage Clamp | Industrial PLC Input Protection |
Use Scenario: Protecting 3.3 V microcontroller GPIOs from ESD and inductive kickback in wireless sensor nodes. IC Role / Device Role / Timing Role: Low-leakage (3 μA @ 5 V) shunt clamp activated during fast transients. Use Value: Enables battery life >10 years in sleep mode while surviving >16 kV HBM ESD events. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring faults and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage limiter before TVS diode or optocoupler input stage. Use Value: Provides predictable 6.8 V clamping threshold with 556 °C/W thermal resistance for sustained fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V8LT1G | Same 6.8 V nominal, but 350 mW rating on FR-4 and higher ZZT (10 Ω); no AEC-Q101 qualification. | Targeted at commercial-grade consumer electronics, not automotive or extended-temp industrial use. | Select when higher power margin is needed and automotive qualification is unnecessary. |
| SZBZX84C6V8LT1G | AEC-Q101 qualified like SZMMBZ5235BLT1G, but uses BZX84 platform with 10 Ω ZZT and 5 μA leakage @ 5 V. | Offers same automotive reliability but with higher dynamic impedance and leakage than SZMMBZ5235BLT1G. | Choose when legacy BZX84 footprint compatibility is required and tighter ZZT is not critical. |
Compared with BZX84-C6V8LT1G and SZBZX84C6V8LT1G, SZMMBZ5235BLT1G delivers lower dynamic impedance (5 Ω vs. ≥10 Ω) and lower leakage (3 μA vs. 5 μA), making it preferable for precision reference and ultra-low-power applications where regulation stability and standby current are critical.
Availability
SZMMBZ5235BLT1G is available at Aetrix Electronics and suitable for USB power protection, automotive sensor reference, IoT node voltage clamp, and industrial PLC input protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SZMMBZ5235BLT1G 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.
SZMMBZ5235BLT1G belongs to the SZMMBZ52xxBLT1G series - engineered for automotive-grade voltage regulation with enhanced process controls, PPAP capability, and extended temperature reliability.
FAQ
What is the Zener voltage tolerance of SZMMBZ5235BLT1G?
The SZMMBZ5235BLT1G has a Zener voltage range of 6.46 V to 7.14 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 6.8 V value. This tolerance is guaranteed across operating temperature and lifetime, and is verified per AEC-Q101 stress testing protocols. The SZMMBZ5235BLT1G maintains this specification without requiring external calibration or trimming.
Is SZMMBZ5235BLT1G pin-compatible with standard MMBZ5235BLT1G?
Yes - SZMMBZ5235BLT1G shares identical SOT-23 pinout (Pin 1: Anode, Pin 2: NC, Pin 3: Cathode), mechanical dimensions, and electrical specifications with MMBZ5235BLT1G. The "SZ" prefix denotes automotive-specific process controls and PPAP documentation, not physical or electrical differences. The SZMMBZ5235BLT1G can be substituted into existing MMBZ5235BLT1G layouts without modification.
What is the maximum power dissipation of SZMMBZ5235BLT1G on an FR-5 board?
SZMMBZ5235BLT1G is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with linear derating of 1.8 mW/°C above that point. This rating assumes standard JEDEC-defined board construction (1.0 × 0.75 × 0.62 in). Exceeding this limit risks thermal runaway or accelerated parametric shift. The SZMMBZ5235BLT1G datasheet specifies RJA = 556 °C/W under these conditions.
Does SZMMBZ5235BLT1G require a heatsink in typical applications?
No - SZMMBZ5235BLT1G does not require an external heatsink in standard applications due to its low 225 mW power rating and SOT-23 thermal design. Its 556 °C/W junction-to-ambient thermal resistance allows safe operation up to ~85°C ambient when dissipating full rated power. For continuous 20 mA Zener current at 6.8 V, power is only ~136 mW - well within limits without added thermal mass. The SZMMBZ5235BLT1G relies on PCB copper for heat spreading, not discrete heatsinks.
What is the reverse leakage current specification for SZMMBZ5235BLT1G?
SZMMBZ5235BLT1G guarantees a maximum reverse leakage current of 3 μA at 5 V reverse bias (VR) and 25°C ambient temperature. This value is measured per the datasheet's Electrical Characteristics table and remains stable across the full −65°C to +150°C junction temperature range. Low leakage ensures minimal impact on battery drain in always-on IoT and automotive standby circuits using the SZMMBZ5235BLT1G.
SZMMBZ5235BLT1G 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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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)
SZMMBZ5235BLT1G FAQ
1.How can I place an order for SZMMBZ5235BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5235BLT1G 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 SZMMBZ5235BLT1G reliable?
The price and inventory of SZMMBZ5235BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5235BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5235BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5235BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5235BLT1G?
SZMMBZ5235BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5235BLT1G 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 SZMMBZ5235BLT1G?
For technical support, including SZMMBZ5235BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5235BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5235BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5235BLT1G 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 SZMMBZ5235BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5235BLT1G?
All SZMMBZ5235BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5235BLT1G, 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 SZMMBZ5235BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5235BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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