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onsemi SZMMSZ6V8T1G
- Part No.:
- SZMMSZ6V8T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ6V8T1G.pdf
- Description:
- DIODE ZENER 6.8V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,945
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Product details
Overview
SZMMSZ6V8T1G from onsemi is a 6.8 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 15 Ω dynamic impedance at 5 mA and 2 μA reverse leakage at 5.6 V, used for precision voltage regulation and overvoltage protection in automotive power rails and low-power sensor interfaces.
For engineers reviewing the SZMMSZ6V8T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, HBM ESD rating (>16 kV), AEC−Q101 qualification status, and SOD−123 board assembly compatibility.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its nominal Zener voltage (6.8 V) with tight ±5% tolerance. It exhibits low dynamic impedance (15 Ω @ 5 mA) and stable temperature coefficient near zero (≈0.2 mV/°C per Figure 1), enabling accurate regulation across −55°C to +150°C.
Designed for surface-mount use on FR−4/FR−5 boards, it supports automated placement and reflow soldering up to 260°C for 10 seconds. Its cathode-anode polarity is marked by a band, and it meets UL 94 V−0 flammability and AEC−Q101 automotive reliability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V @ IZT = 5 mA; ensures stable 6.8 V regulation within ±5% tolerance under nominal bias. |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; derates linearly at 6.7 mW/°C above 75°C - defines maximum continuous power in PCB-constrained thermal environments. |
| Zener Impedance (ZZT) | 15 Ω @ IZT = 5 mA, f = 1 kHz; low AC impedance enables effective ripple suppression in feedback or reference paths. |
| Reverse Leakage (IR) | 2 μA @ VR = 5.6 V; minimal off-state current preserves battery life and signal integrity in low-power standby circuits. |
| Junction Temp Range | −55°C to +150°C; validated operation across full automotive under-hood and industrial ambient conditions. |
| ESD Rating | Class 3 (>16 kV) per HBM; withstands high-energy electrostatic discharge without parameter shift or failure. |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes conduction path during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring extended temperature and reliability compliance. |
| Pb−Free (RoHS Compliant) | Meets global environmental regulations; "G" suffix denotes lead-free termination and compatible with standard reflow profiles. |
| High-Density SOD−123 Footprint | Enables compact layout in space-constrained modules such as automotive sensors and portable instrumentation. |
| Optimized for Automated Assembly | Package geometry and marking support high-yield pick-and-place and AOI inspection in volume manufacturing. |
Applications
| Automotive Power Rail Clamping | Low-Power Sensor Reference |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping voltage spikes to safe levels during alternator load dump events. Use Value: Prevents latch-up or damage to downstream ICs by limiting transient voltage to ≤7.14 V with fast response and no external control logic. | Use Scenario: Providing stable 6.8 V reference for analog front-ends in tire pressure monitoring systems (TPMS). IC Role / Device Role / Timing Role: Passive voltage reference source for ADC biasing and sensor excitation in ultra-low-power intermittent wake-up cycles. Use Value: Enables <2 μA leakage and ±5% accuracy over −40°C to +125°C - critical for multi-year battery life and calibration stability. |
| Industrial PLC Input Protection | Consumer USB Port Overvoltage Clamp |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring faults and EFT bursts. IC Role / Device Role / Timing Role: Shunt protection element absorbing surge energy while maintaining defined clamping voltage during IEC 61000-4-4 events. Use Value: Delivers consistent 6.8 V clamping with 15 Ω dynamic impedance - reduces voltage overshoot and improves immunity margin without active components. | Use Scenario: Preventing damage to USB 2.0 data lines and power switches from accidental 12 V adapter misconnection. IC Role / Device Role / Timing Role: Standby-mode overvoltage clamp placed between VBUS and ground on host-side ports. Use Value: Blocks >7.14 V with <2 μA quiescent current - avoids false triggering while preserving USB enumeration timing and signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ6V8T1G | No SZ prefix; not AEC−Q101 qualified; identical electrical specs and SOD−123 package. | Intended for commercial/industrial use only; lacks automotive traceability and PPAP documentation. | Select when AEC−Q101 compliance is unnecessary and cost sensitivity outweighs automotive qualification requirements. |
| BZX84-C6V8 | Higher ZZT (40 Ω @ 5 mA); SOT−23 package (larger footprint); ±5% tolerance; no AEC−Q101 rating. | Lower regulation precision and thermal performance; unsuitable for high-density or automotive designs. | Consider only for legacy SOT−23 layouts where board rework is prohibitive and tighter impedance is not required. |
Compared with MMSZ6V8T1G and BZX84-C6V8, SZMMSZ6V8T1G uniquely combines AEC−Q101 qualification, 15 Ω Zener impedance, and SOD−123 miniaturization - making it the only choice for new automotive designs requiring both reliability and space efficiency.
Availability
SZMMSZ6V8T1G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor conditioning, and consumer port protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SZMMSZ6V8T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMSZ6V8T1G belongs to the SZMMSZxxxT1G series - a family of AEC−Q101-qualified Zener diodes engineered specifically for automotive subsystems demanding robust voltage regulation, high ESD immunity, and extended temperature operation.
FAQ
What is the Zener voltage tolerance for SZMMSZ6V8T1G?
The SZMMSZ6V8T1G has a nominal Zener voltage of 6.8 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 6.46 V and 7.14 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is guaranteed per onsemi's datasheet revision 13 and applies across the full operating temperature range.
Is SZMMSZ6V8T1G suitable for automotive applications?
Yes, SZMMSZ6V8T1G is AEC−Q101 qualified and PPAP capable, with full traceability and process controls meeting automotive reliability standards. Its −55°C to +150°C junction temperature range, >16 kV HBM ESD rating, and SOD−123 package make it appropriate for engine control, body electronics, and ADAS power rail protection.
What is the maximum power dissipation of SZMMSZ6V8T1G at 100°C ambient?
At 100°C ambient, SZMMSZ6V8T1G dissipates 332.5 mW: starting from 500 mW at 75°C, it derates at 6.7 mW/°C, so (100 − 75) × 6.7 = 167.5 mW reduction. This value assumes mounting on FR−5 board per datasheet Note 1 and must be verified with actual PCB thermal design.
Does SZMMSZ6V8T1G have lead-free construction?
Yes, SZMMSZ6V8T1G is Pb−free and RoHS compliant, indicated by the "G" suffix in its part number. Its terminations meet JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and are compatible with standard lead-free reflow profiles up to 260°C for 10 seconds.
How does the dynamic impedance of SZMMSZ6V8T1G affect its regulation performance?
SZMMSZ6V8T1G has a dynamic impedance (ZZT) of 15 Ω at IZT = 5 mA and 1 kHz, meaning small changes in Zener current produce minimal voltage variation - improving regulation accuracy in noisy or varying-load environments. Lower ZZT directly enhances ripple rejection and reference stability compared to higher-impedance alternatives like BZX84-C6V8.
SZMMSZ6V8T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 4 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ6V8T1G FAQ
1.How can I place an order for SZMMSZ6V8T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ6V8T1G 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 SZMMSZ6V8T1G reliable?
The price and inventory of SZMMSZ6V8T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ6V8T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ6V8T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ6V8T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ6V8T1G?
SZMMSZ6V8T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ6V8T1G 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 SZMMSZ6V8T1G?
For technical support, including SZMMSZ6V8T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ6V8T1G requirements.
6.How does Aetrix verify that SZMMSZ6V8T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ6V8T1G 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 SZMMSZ6V8T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ6V8T1G?
All SZMMSZ6V8T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ6V8T1G, 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 SZMMSZ6V8T1G part is unused and in its original packaging.
Return procedure for SZMMSZ6V8T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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