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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi SZNZ8F6V8SMX2WT5G

Name: SZNZ8F6V8SMX2WT5G
Brand: onsemi
SKU: SZNZ8F6V8SMX2WT5G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZNZ8F6V8SMX2WT5G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: 2-XDFN

Datasheet:: SZNZ8F6V8SMX2WT5G.pdf

Description:: DIODE ZENER 6.8V 250MW 2-X2DFNW

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Product details

Overview

SZNZ8F6V8SMX2WT5G from onsemi is a tight-tolerance Zener diode designed for precision voltage regulation and overvoltage protection in space-constrained PCB layouts. It delivers a nominal Zener voltage of 6.8 V (6.64–6.96 V), 40 Ω dynamic impedance at 5 mA test current, 0.5 µA reverse leakage at 3.5 V, and operates within −65 °C to +150 °C junction temperature range - ideal for automotive control units and portable power rail clamping.

For engineers reviewing the SZNZ8F6V8SMX2WT5G datasheet, pinout, applications, or equivalent options, key selection criteria include AEC-Q101 qualification, wettable flank X2DFNW2 package for AOI compatibility, ±1.5% voltage tolerance, thermal resistance of 247 °C/W (on 150 mm² FR-4), and 500 mW power dissipation capability.

Technical Context

This device functions as a unidirectional, silicon planar Zener diode optimized for stable reverse-bias voltage reference and transient suppression. Its operation relies on controlled avalanche breakdown at precisely defined Zener voltage, with low dynamic impedance ensuring minimal regulation error under varying load currents.

The SZNZ8F6V8SMX2WT5G is rated for 500 mW total dissipation on a 150 mm² FR-4 board (1.2 mW/°C derating above 25 °C) and features a maximum capacitance of 105 pF at 0 V bias and 1 MHz - critical for high-frequency noise filtering in DC-DC feedback paths and I/O line protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.64–6.96 V @ I_ZT = 5 mA - ensures ±1.5% regulation accuracy for 6.8 V nominal rails
Zener Impedance (Z_ZT)	40 Ω max @ 5 mA - maintains tight output voltage stability under dynamic load changes
Reverse Leakage (I_R)	0.5 µA max @ V_R = 3.5 V - minimizes standby power loss in battery-powered systems
Power Dissipation (P_D)	500 mW @ T_A = 25 °C (150 mm² pad) - supports robust transient energy absorption without thermal runaway
Capacitance (C)	105 pF @ V_R = 0 V, f = 1 MHz - enables effective high-frequency ESD/EMI filtering on signal lines
Junction Temp Range	−65 °C to +150 °C - qualified for under-hood automotive environments and industrial edge nodes
AEC-Q101 Qualified	Yes - meets stress test requirements for automotive electronics reliability and lifetime validation

Pinout & Package

Package: X2DFNW2 (Case 711BG), 0402-inch footprint (1.00 × 0.60 × 0.37 mm), wettable flank design for automated optical inspection (AOI) and solder joint quality verification.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener voltage reference node	Connected to regulated rail or protected input; polarity must be observed to enable reverse-bias breakdown
2 (Anode)	Reference ground return	Typically tied to system GND or low-impedance return path; defines cathode-to-anode voltage polarity

Key Features

Feature	Design Value
Tight voltage tolerance	±1.5% (6.64–6.96 V) - reduces need for post-production calibration in precision analog circuits
Wettable flank package	X2DFNW2 with side-wettable leads - enables reliable AOI detection of solder fillet formation and voiding
Automotive qualification	AEC-Q101 compliant with PPAP capability - supports direct integration into Tier-1 automotive ECUs without requalification
Low-profile height	0.40 mm max body height - allows placement beneath connectors or in ultra-thin handheld PCB stacks
Pb-free & RoHS	Halogen-free/BFR-free construction - satisfies global environmental compliance and lead-free reflow process requirements

Applications

Automotive Engine Control Unit (ECU)	USB-C Power Delivery Interface
Use Scenario: Voltage clamping on 5 V sensor supply rail exposed to load dump transients up to 40 V. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp during ISO 7637-2 pulse 5a events. Use Value: Limits rail excursion to ≤7.5 V using 500 mW rating and −65 °C to +150 °C operation, preventing MCU brownout or ADC saturation.	Use Scenario: Reverse-polarity protection and voltage limiting on CC line and VCONN auxiliary power path. IC Role / Device Role / Timing Role: Unidirectional Zener providing fast turn-on clamping (<10 ns response) to protect USB PD controller GPIOs. Use Value: 105 pF capacitance avoids signal integrity degradation on 3 MHz CC communication, while 0.5 µA leakage preserves low-power suspend mode.
Industrial IoT Sensor Node	Medical Wearable Battery Monitor
Use Scenario: Reference stabilization for 12-bit SAR ADC measuring 3.3 V LDO output in wireless sensor hub. IC Role / Device Role / Timing Role: Precision Zener supplying stable 6.8 V reference to op-amp buffer driving ADC reference input. Use Value: ±1.5% tolerance and 40 Ω Z_ZT ensure <0.05% reference drift across 0–70 °C ambient, enabling <±1 LSB measurement accuracy.	Use Scenario: Overvoltage protection on lithium-ion cell voltage monitoring input (0–4.2 V range). IC Role / Device Role / Timing Role: Clamp diode placed between battery sense trace and microcontroller ADC input to prevent ESD-induced latch-up. Use Value: 0.40 mm height allows placement adjacent to 0201 resistors in compact wearable flex PCB; AEC-Q101 grade assures long-term reliability in skin-contact devices.

Automotive Engine Control Unit (ECU)

USB-C Power Delivery Interface

Use Scenario: Voltage clamping on 5 V sensor supply rail exposed to load dump transients up to 40 V.

IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp during ISO 7637-2 pulse 5a events.

Use Value: Limits rail excursion to ≤7.5 V using 500 mW rating and −65 °C to +150 °C operation, preventing MCU brownout or ADC saturation.

Use Scenario: Reverse-polarity protection and voltage limiting on CC line and VCONN auxiliary power path.

IC Role / Device Role / Timing Role: Unidirectional Zener providing fast turn-on clamping (<10 ns response) to protect USB PD controller GPIOs.

Use Value: 105 pF capacitance avoids signal integrity degradation on 3 MHz CC communication, while 0.5 µA leakage preserves low-power suspend mode.

Industrial IoT Sensor Node

Medical Wearable Battery Monitor

Use Scenario: Reference stabilization for 12-bit SAR ADC measuring 3.3 V LDO output in wireless sensor hub.

IC Role / Device Role / Timing Role: Precision Zener supplying stable 6.8 V reference to op-amp buffer driving ADC reference input.

Use Value: ±1.5% tolerance and 40 Ω Z_ZT ensure <0.05% reference drift across 0–70 °C ambient, enabling <±1 LSB measurement accuracy.

Use Scenario: Overvoltage protection on lithium-ion cell voltage monitoring input (0–4.2 V range).

IC Role / Device Role / Timing Role: Clamp diode placed between battery sense trace and microcontroller ADC input to prevent ESD-induced latch-up.

Use Value: 0.40 mm height allows placement adjacent to 0201 resistors in compact wearable flex PCB; AEC-Q101 grade assures long-term reliability in skin-contact devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C6V8LT1G	Standard tolerance (±5%), SOT-23 package (1.3 × 1.3 × 0.9 mm), 350 mW P_D, 100 Ω Z_ZT	Larger footprint, lower power, looser regulation - suitable for non-critical consumer logic rail clamping	Select when cost sensitivity outweighs precision and space constraints; not AEC-Q101 qualified
MMSZ4687T1G	Tight tolerance (±1%), SOD-123 package (2.7 × 1.6 × 1.1 mm), 500 mW P_D, 30 Ω Z_ZT, but no wettable flank or AEC-Q101	Higher Zener current (20 mA), larger size - better for higher-power analog references but incompatible with AOI-driven automotive lines	Choose for industrial analog designs needing tighter tolerance than SZNZ8F6V8SMX2WT5G but without automotive certification requirements

Compared with BZX84-C6V8LT1G and MMSZ4687T1G, the SZNZ8F6V8SMX2WT5G uniquely combines AEC-Q101 qualification, wettable flank X2DFNW2 packaging, and ±1.5% tolerance in a 0402 footprint - making it the only option for space-limited, AOI-verified, automotive-grade 6.8 V clamping.

Availability

SZNZ8F6V8SMX2WT5G is available at Aetrix Electronics and suitable for automotive engine control units, USB-C power delivery interfaces, and industrial IoT sensor nodes requiring stable component supply with full traceability and lifecycle management.

Supply support for SZNZ8F6V8SMX2WT5G 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.

The NZ8F Series is part of onsemi's precision discrete portfolio, engineered specifically for high-reliability voltage regulation in miniaturized, thermally constrained, and automotive-qualified electronic systems.

FAQ

What is the Zener voltage tolerance of SZNZ8F6V8SMX2WT5G?

The SZNZ8F6V8SMX2WT5G has a tight Zener voltage tolerance of ±1.5%, specified as 6.64 V minimum to 6.96 V maximum at 5 mA test current. This tolerance is confirmed in the "Tight Tolerance Series" table on page 3 of the official onsemi datasheet. The SZNZ8F6V8SMX2WT5G achieves this precision through enhanced process control and binning, distinguishing it from standard-tolerance variants like NZ8F6V8MX2WT5G (±5%).

Is SZNZ8F6V8SMX2WT5G qualified for automotive use?

Yes, the SZNZ8F6V8SMX2WT5G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's "Specification Features" section and footnote * on pages 2–3. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements. This qualification covers temperature cycling, humidity testing, mechanical shock, and other stress tests required for under-hood and cabin ECU deployment.

What is the thermal resistance (R_JA) of SZNZ8F6V8SMX2WT5G on a standard PCB?

The SZNZ8F6V8SMX2WT5G has a junction-to-ambient thermal resistance (R_JA) of 247 °C/W when mounted on a 150 mm² FR-4 board with 1 oz. copper (Note 2 in Maximum Ratings table). This value assumes optimal pad layout per Case 711BG mechanical drawing and directly determines safe operating temperature rise at 500 mW dissipation - critical for thermal design in sealed enclosures.

Does SZNZ8F6V8SMX2WT5G support automated optical inspection (AOI)?

Yes, the SZNZ8F6V8SMX2WT5G uses the X2DFNW2 package with wettable flanks, explicitly designed for optimal AOI performance. As noted in the "Specification Features" section, the side-wettable leads allow machine vision systems to inspect solder fillet geometry and detect insufficient solder or bridging - a requirement for high-yield automotive PCB assembly lines.

What is the maximum reverse leakage current for SZNZ8F6V8SMX2WT5G?

The maximum reverse leakage current (I_R) for SZNZ8F6V8SMX2WT5G is 0.5 µA at V_R = 3.5 V, as specified in the "Tight Tolerance Series" electrical characteristics table on page 3. This low leakage supports ultra-low-power operation in battery-backed systems and prevents measurable current draw on standby rails - verified under TA = 25 °C conditions.

SZNZ8F6V8SMX2WT5G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: NZ8F

Package/Case:: 2-XDFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 6.8 V

Tolerance:: ±2.35%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 40 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 3.5 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 2-X2DFNW (1x0.6)

SZNZ8F6V8SMX2WT5G FAQ

1.How can I place an order for SZNZ8F6V8SMX2WT5G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZNZ8F6V8SMX2WT5G 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 SZNZ8F6V8SMX2WT5G reliable?

The price and inventory of SZNZ8F6V8SMX2WT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ8F6V8SMX2WT5G is usually 5 days.

3.What payment methods are accepted for SZNZ8F6V8SMX2WT5G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ8F6V8SMX2WT5G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZNZ8F6V8SMX2WT5G?

SZNZ8F6V8SMX2WT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZNZ8F6V8SMX2WT5G 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 SZNZ8F6V8SMX2WT5G?

For technical support, including SZNZ8F6V8SMX2WT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ8F6V8SMX2WT5G requirements.

6.How does Aetrix verify that SZNZ8F6V8SMX2WT5G is sourced from the original manufacturer or authorized distributors?

All SZNZ8F6V8SMX2WT5G 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 SZNZ8F6V8SMX2WT5G meets industry standards.

7.What is the process for return or replacement of SZNZ8F6V8SMX2WT5G?

All SZNZ8F6V8SMX2WT5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ8F6V8SMX2WT5G, 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 SZNZ8F6V8SMX2WT5G part is unused and in its original packaging.

Return procedure for SZNZ8F6V8SMX2WT5G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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