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onsemi SZMMSZ27T1G
- Part No.:
- SZMMSZ27T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ27T1G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:20,174
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Product details
Overview
SZMMSZ27T1G from onsemi is a 27 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 80 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 18.9 V. It serves as a precision voltage reference or overvoltage clamp in automotive power management circuits.
For engineers reviewing the SZMMSZ27T1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, AEC−Q101 qualification status, and direct alternatives for automotive-grade voltage regulation design.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias breakdown at nominal 27 V with ±5% tolerance. Its 80 Ω dynamic impedance (ZZT) at IZT = 2 mA ensures low voltage variation under load changes, while its −55°C to +150°C junction temperature range supports under-hood automotive deployment.
The SOD−123 package provides 150°C/W junction-to-lead thermal resistance and supports automated placement. ESD rating exceeds 16 kV (HBM Class 3), and it meets AEC−Q101 stress testing requirements for automotive electronics reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V min / 27 V nom / 28.35 V max at IZT = 2 mA - defines precise clamping threshold for 12 V–24 V system rail protection |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | 0.05 μA max at VR = 18.9 V - ensures minimal quiescent current draw in standby mode |
| Thermal Resistance (RJL) | 150°C/W junction-to-lead - enables accurate PCB trace thermal modeling for heatsinking decisions |
| ESD Rating (HBM) | Class 3 (>16 kV) - qualifies for direct integration into unshielded automotive sensor interfaces |
| Junction Temp Range | −55°C to +150°C - supports operation in engine control units and transmission control modules |
Pinout & Package
SOD−123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm); cathode indicated by polarity band; lead-free (Pb−Free) construction per onsemi specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased during normal regulation operation |
| 2 (Anode) | Reference/ground terminal | Typically tied to system ground or lower-potential rail; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains |
| 500 mW power rating | Enables use in compact space-constrained modules without external heatsinking |
| ±5% VZ tolerance | Supports deterministic voltage margining in safety-critical 24 V supply monitoring circuits |
| Class 3 HBM ESD | Eliminates need for additional transient suppression on low-speed signal lines sharing same PCB region |
| Pb−Free SOD−123 package | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 24 V supply rail transients induced by solenoid switching in diesel ECU power stages. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage regulator and overvoltage protector for microcontroller VDD domain. Use Value: Maintains regulated 27 V clamp point with ≤80 Ω dynamic impedance, limiting peak rail excursion to safe levels during load dump events. |
Use Scenario: Protecting 4–20 mA current loop receiver inputs against field-wiring surge coupling. IC Role / Device Role / Timing Role: Standby-mode Zener clamp placed across input terminals to absorb induced surges before reaching precision op-amp front-end. Use Value: Sub-0.05 μA leakage at 18.9 V ensures no measurable error injection into high-impedance analog sensing paths. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Power Monitoring |
Use Scenario: Providing reference voltage for window lift motor current sense comparator thresholds. IC Role / Device Role / Timing Role: Precision Zener reference source feeding comparator hysteresis network in motor stall detection circuit. Use Value: ±5% VZ tolerance and −55°C to +150°C operation ensure consistent trip-point accuracy across full vehicle thermal envelope. |
Use Scenario: Monitoring battery-backed 24 V DC supply integrity in portable infusion pump mainboard. IC Role / Device Role / Timing Role: Low-leakage Zener element in undervoltage/overvoltage supervisor circuit feeding microcontroller reset logic. Use Value: 0.05 μA max IR at 18.9 V prevents false resets during extended battery-only operation with minimal self-discharge impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ27T1G | No SZ prefix; commercial grade (non-AEC−Q101); identical electrical specs and SOD−123 package | Not qualified for automotive production; suitable for industrial prototypes or non-safety-critical systems | Select when AEC−Q101 compliance is not required and cost optimization is prioritized |
| BZX84-C27LT1G | Same 27 V nominal Zener voltage but ±6% tolerance; 100 Ω ZZT at 5 mA; SOT−23 package (larger footprint, higher RJA) | Higher thermal resistance limits power handling in dense layouts; looser tolerance affects precision reference use | Choose only if SOT−23 is already standardized in BOM and 27 V ±6% is acceptable for target function |
Compared with MMSZ27T1G and BZX84-C27LT1G, SZMMSZ27T1G uniquely combines AEC−Q101 qualification, ±5% tight tolerance, and low-leakage performance in the smallest SOD−123 footprint-making it the sole choice for production automotive voltage clamping where reliability and space constraints coexist.
Availability
SZMMSZ27T1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump power monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SZMMSZ27T1G 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 power and sensing solutions for automotive, industrial, cloud, and consumer electronics.
SZMMSZ27T1G belongs to the AEC−Q101-qualified SZMMSZxxxT1G Zener regulator series, engineered specifically for robust voltage reference and overvoltage protection in harsh-environment automotive electronics.
FAQ
What is the Zener voltage tolerance of SZMMSZ27T1G?
The SZMMSZ27T1G has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 25.65 V and 28.35 V at IZT = 2 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 13, June 2024) and applies across the full operating temperature range.
Is SZMMSZ27T1G qualified for automotive applications?
Yes, SZMMSZ27T1G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, site-specific process validation, and stress testing aligned with automotive reliability standards-making SZMMSZ27T1G suitable for production ECUs, BCMs, and ADAS subsystems.
What is the maximum reverse leakage current for SZMMSZ27T1G?
The maximum reverse leakage current (IR) for SZMMSZ27T1G is 0.05 μA at VR = 18.9 V, per the Electrical Characteristics table on page 3 of the onsemi datasheet. This ultra-low leakage ensures minimal parasitic loading in high-impedance reference or monitoring circuits, especially critical in battery-powered medical and automotive applications.
Does SZMMSZ27T1G have Pb−Free packaging?
Yes, SZMMSZ27T1G uses a Pb−Free SOD−123 package, as confirmed by the "G" suffix in the part number and the "Pb−Free Packages are Available" statement in the datasheet Features section. It complies with RoHS Directive 2011/65/EU and meets JEDEC J-STD-020 reflow soldering requirements for lead-free assembly processes.
What is the thermal resistance junction-to-lead for SZMMSZ27T1G?
The thermal resistance junction-to-lead (RJL) for SZMMSZ27T1G is 150°C/W, as specified in the Maximum Ratings table on page 1 of the onsemi datasheet. This value enables accurate thermal modeling of PCB copper pour and trace design for heat dissipation-critical when operating near the 500 mW power limit in confined automotive enclosures.
SZMMSZ27T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ27T1G FAQ
1.How can I place an order for SZMMSZ27T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ27T1G 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 SZMMSZ27T1G reliable?
The price and inventory of SZMMSZ27T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ27T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ27T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ27T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ27T1G?
SZMMSZ27T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ27T1G 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 SZMMSZ27T1G?
For technical support, including SZMMSZ27T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ27T1G requirements.
6.How does Aetrix verify that SZMMSZ27T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ27T1G 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 SZMMSZ27T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ27T1G?
All SZMMSZ27T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ27T1G, 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 SZMMSZ27T1G part is unused and in its original packaging.
Return procedure for SZMMSZ27T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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