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onsemi SZMM3Z27VST1G
- Part No.:
- SZMM3Z27VST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z27VST1G.pdf
- Description:
- DIODE ZENER 26.86V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,800
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Product details
Overview
SZMM3Z27VST1G from onsemi is a 27 V ±3.8% Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation, 300 mW on FR-4 board, with 80 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 21.4 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the SZMM3Z27VST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±3.8%), thermal resistance (250 °C/W with heatsink), ESD rating (>16 kV HBM), AEC-Q101 qualification, and SOD−323 footprint compatibility.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified Zener breakdown voltage of 26.19–27.53 V at 5 mA. Its low 0.9 V forward voltage at 10 mA enables bidirectional clamping capability.
The SOD−323 package supports high-density PCB layouts with 1.7 mm × 1.25 mm footprint and 0.9 mm height, while its Pb-free, halogen-free construction complies with RoHS and automotive PPAP requirements per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.19 V min to 27.53 V max at 5 mA - defines regulated output voltage range under nominal bias |
| Power Dissipation | 500 mW max (with heatsink); 300 mW on standard FR-4 - determines thermal derating margin in compact layouts |
| Zener Impedance (ZZT) | 300 Ω max at IZT = 5 mA - impacts regulation stability under varying load current |
| Reverse Leakage (IR) | 0.05 μA max at VR = 21.4 V - ensures minimal standby current in voltage-sense circuits |
| Capacitance (C) | 70 pF max at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in signal-path protection |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robust handling without external ESD protection in final assembly |
| Temperature Coefficient | +18.9 mV/°C at 5 mA - quantifies VZ drift over operating temperature range |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.85 mm body, cathode indicated by polarity band, Pb-free plating, UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±3.8% at 27 V - reduces need for post-regulation trimming in battery-powered systems |
| AEC-Q101 qualification | Automotive-grade reliability with PPAP support - enables use in infotainment and body control modules |
| Low-profile SOD−323 package | 0.9 mm height - fits beneath stacked components in ultra-thin mobile PCBs |
| High ESD immunity | >16 kV HBM - eliminates requirement for discrete TVS in handheld ESD-prone interfaces |
| Pb-free and RoHS compliant | No lead, halogen, or BFR content - satisfies global environmental compliance without design rework |
Applications
| Battery Voltage Monitoring | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in smart battery packs to prevent overcharge or deep discharge. IC Role / Device Role / Timing Role: Precision shunt reference for ADC input scaling and comparator threshold setting. Use Value: ±3.8% VZ tolerance ensures accurate 27 V detection across temperature, reducing false trip events. | Use Scenario: Clamping transient surges on USB VBUS lines in portable docking stations. IC Role / Device Role / Timing Role: Fast-response shunt protector that activates before downstream IC damage occurs. Use Value: 300 mW power rating and 300 Ω ZZT enable reliable clamping of 20–30 V transients without thermal runaway. |
| Automotive Infotainment Power Rail Clamp | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting 24 V supply rails in head-unit audio amplifiers from load-dump spikes. IC Role / Device Role / Timing Role: Standby-mode voltage clamp activated only during overvoltage events. Use Value: AEC-Q101 qualification and 150 °C TJ rating ensure stable operation under under-hood thermal stress. | Use Scenario: Providing stable 27 V reference for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Two-terminal passive reference source with negligible quiescent current draw. Use Value: 0.05 μA leakage at 21.4 V minimizes error contribution in microamp-level loop current accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B27,115 | 27 V ±5%, 300 mW, SOD-323, no AEC-Q101 qualification | Lacks automotive qualification; lower ESD rating (8 kV HBM) | Preferred for cost-sensitive consumer electronics where AEC-Q101 is not required |
| MMSZ5258ET1G | 27 V ±5%, 500 mW, SOD-123, larger footprint (3.5 mm × 1.6 mm) | Requires PCB layout change due to different package outline and thermal pad area | Used when higher thermal mass is needed but SOD-323 space constraint does not apply |
Compared with BZX384-B27,115 and MMSZ5258ET1G, SZMM3Z27VST1G offers tighter voltage tolerance, automotive qualification, and superior ESD robustness in the smallest SOD−323 footprint-making it optimal for space-limited, high-reliability designs requiring precise 27 V regulation.
Availability
SZMM3Z27VST1G is available at Aetrix Electronics and suitable for battery management systems, USB-C power delivery protection, and automotive infotainment modules requiring stable component supply and long-term lifecycle support.
Supply support for SZMM3Z27VST1G 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.
The MM3Z/SZMM3Z series targets high-density, low-power voltage regulation in portable and automotive electronics, emphasizing tight tolerance, miniature packaging, and AEC-Q101 compliance for mission-critical signal integrity.
FAQ
What is the Zener voltage tolerance of SZMM3Z27VST1G?
The SZMM3Z27VST1G has a Zener voltage range of 26.19 V to 27.53 V at 5 mA test current, corresponding to a ±3.8% tolerance around the nominal 27 V rating. This tight tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet and enables precise voltage reference applications without external calibration. The SZMM3Z27VST1G maintains this specification across its full operating temperature range.
Is SZMM3Z27VST1G qualified for automotive use?
Yes, SZMM3Z27VST1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the "Specification Features" section of the onsemi datasheet. The "SZ" prefix denotes devices manufactured under automotive-specific site and process controls. This qualification covers temperature cycling, humidity testing, and mechanical stress validation, making SZMM3Z27VST1G suitable for under-hood and cabin electronics where reliability is critical.
What is the maximum power dissipation of SZMM3Z27VST1G on a standard PCB?
SZMM3Z27VST1G delivers 300 mW maximum power dissipation on a standard FR-4 board (1 cm² copper area), as specified in the "Maximum Ratings" table. With an optimized 38 mm² copper heatsink, it achieves 500 mW. Thermal resistance is 416 °C/W (standard board) or 250 °C/W (heatsink), enabling accurate junction temperature estimation using TJ = TA + (P × RJA). This data is measured and published in the onsemi datasheet for SZMM3Z27VST1G.
Does SZMM3Z27VST1G have ESD protection built-in?
Yes, SZMM3Z27VST1G features Class 3 ESD protection (>16 kV) per the Human Body Model (HBM), as documented in the "Specification Features" section of the onsemi datasheet. This level of ESD robustness eliminates the need for additional discrete ESD suppressors in many handheld and interface applications. The ESD rating applies directly to the SZMM3Z27VST1G device terminals and is verified during qualification testing.
What is the reverse leakage current specification for SZMM3Z27VST1G?
The reverse leakage current for SZMM3Z27VST1G is 0.05 μA maximum at VR = 21.4 V, as specified in the Electrical Characteristics table. This low leakage ensures minimal parasitic current draw in high-impedance reference or monitoring circuits. The value is measured at 25°C and remains stable across the −65°C to +150°C junction temperature range, supporting reliable performance in battery-powered and automotive environments.
SZMM3Z27VST1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 26.86 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 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
- Supplier Device Package:
- SOD-323
SZMM3Z27VST1G FAQ
1.How can I place an order for SZMM3Z27VST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z27VST1G 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 SZMM3Z27VST1G reliable?
The price and inventory of SZMM3Z27VST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z27VST1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z27VST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z27VST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z27VST1G?
SZMM3Z27VST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z27VST1G 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 SZMM3Z27VST1G?
For technical support, including SZMM3Z27VST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z27VST1G requirements.
6.How does Aetrix verify that SZMM3Z27VST1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z27VST1G 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 SZMM3Z27VST1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z27VST1G?
All SZMM3Z27VST1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z27VST1G, 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 SZMM3Z27VST1G part is unused and in its original packaging.
Return procedure for SZMM3Z27VST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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