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onsemi SZMMSZ27ET1G
- Part No.:
- SZMMSZ27ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ27ET1G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:54,000
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Product details
Overview
SZMMSZ27ET1G 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 on FR-5 board, with 80 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 25 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMMSZ27ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (340 °C/W), AEC-Q101 qualification, ESD rating (>16 kV HBM), and SOD-123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 27 V output across load variations by conducting reverse current above its breakdown threshold. It features a temperature coefficient of +6.5 mV/°C (typical for 27 V Zeners per Figure 1), enabling predictable drift compensation in bias networks.
Designed for automotive-grade reliability, SZMMSZ27ET1G meets AEC-Q101 stress testing requirements and supports peak surge power up to 225 W (8 × 20 µs pulse), with junction-to-ambient thermal resistance of 340 °C/W ensuring stable operation under transient thermal loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, ±5% tolerance (25.65–28.35 V), measured at 5 mA test current for stable reference accuracy |
| Power Dissipation | 500 mW on FR-5 board at 75 °C, derated linearly above that temperature (6.7 mW/°C) |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 5 mA, ensuring minimal output voltage variation under load transients |
| Reverse Leakage Current | ≤0.05 µA at VR = 25 V, enabling low-power standby regulation without significant quiescent loss |
| ESD Rating | Class 3 (>16 kV) per Human Body Model, supporting robust handling in automated assembly lines |
| Thermal Resistance | Junction-to-ambient: 340 °C/W; junction-to-lead: 150 °C/W - critical for thermal design margin in enclosed modules |
| Operating Temperature | −55 °C to +150 °C junction range, validated for under-hood automotive environments |
Pinout & Package
SOD-123 plastic surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band, UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage rail; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential node; completes shunt regulation path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring extended temperature and vibration reliability |
| Pb-Free Construction | RoHS-compliant SOD-123 package with lead-free solder compatibility and 260 °C reflow tolerance (10 s) |
| High Surge Withstand | 225 W nonrepetitive peak power (8 × 20 µs) enables protection against load-dump transients in 12 V systems |
| Low Capacitance | ~10 pF typical at 0 V bias (per Figure 7), minimizing signal coupling in high-frequency sensing circuits |
| Stable Tempco | +6.5 mV/°C typical (inferred from Figure 1 trend for 27 V point), supporting predictable drift in temperature-compensated references |
Applications
| Automotive Power Rail Protection | Industrial Sensor Biasing |
|---|---|
Use Scenario: Clamping 12 V battery line against load-dump spikes up to 40 V in engine control modules. IC Role / Device Role / Timing Role: Shunt regulator providing passive overvoltage protection without active control circuitry. Use Value: Prevents damage to downstream MCUs and analog front-ends using only 27 V clamping with <0.05 µA leakage at 25 V. | Use Scenario: Supplying stable 27 V reference to precision pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing fixed bias point for Wheatstone bridge excitation. Use Value: Delivers ±5% voltage accuracy and 80 Ω dynamic impedance to maintain bridge stability across 0–70 °C ambient range. |
| Telecom DC-DC Feedback | Medical Instrument Overvoltage Clamp |
Use Scenario: Setting feedback threshold in isolated flyback converters for telecom power supplies. IC Role / Device Role / Timing Role: Precision Zener element in optocoupler feedback loop to regulate secondary-side output voltage. Use Value: Enables tight output regulation (±1%) via 27 V reference with minimal temperature-induced drift (+6.5 mV/°C). | Use Scenario: Protecting analog input stages of patient monitoring equipment from ESD and transient overvoltages. IC Role / Device Role / Timing Role: Low-leakage (<0.05 µA) clamp limiting input voltage to safe levels before ADC front-end. Use Value: Maintains signal integrity with 10 pF capacitance while surviving >16 kV HBM ESD events per AEC-Q101 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V ±5%, but 300 mW rating and SOT-23 package; higher ZZT (100 Ω max) | Limited to lower-power consumer applications due to reduced power handling and thermal resistance | Select when board space allows SOT-23 and automotive qualification is not required |
| MMSZ27ET1G | Identical electrical specs and SOD-123 package, but lacks SZ-prefix AEC-Q101 qualification and PPAP capability | Not approved for automotive production; suitable only for industrial or commercial designs | Choose only for cost-sensitive non-automotive use where AEC-Q101 is unnecessary |
Compared with BZX84-C27LT1G and MMSZ27ET1G, SZMMSZ27ET1G provides superior automotive reliability (AEC-Q101), higher surge immunity (225 W vs. 100 W), and tighter thermal management (340 °C/W vs. ~400 °C/W), making it the sole option for under-hood deployment.
Availability
SZMMSZ27ET1G is available at Aetrix Electronics and suitable for automotive power protection, industrial sensor biasing, telecom DC-DC feedback, and medical instrument overvoltage clamping requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMSZ27ET1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications, with leadership in power management and discrete devices.
SZMMSZxxxET1G series belongs to onsemi's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for automotive subsystems demanding high-reliability voltage reference and transient suppression in harsh environments.
FAQ
What is the Zener voltage tolerance of SZMMSZ27ET1G?
SZMMSZ27ET1G has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, resulting in a guaranteed range of 25.65 V to 28.35 V when tested at 5 mA Zener current and 25 °C ambient temperature. This tolerance is specified per onsemi's datasheet revision 8 and applies across the full operating temperature range of −55 °C to +150 °C.
Is SZMMSZ27ET1G qualified for automotive applications?
Yes, SZMMSZ27ET1G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive electronic systems including engine control units, body control modules, and ADAS power domains. The "SZ" prefix explicitly denotes compliance with automotive-specific site and process controls, distinguishing it from the commercial-grade MMSZ27ET1G variant.
What is the maximum peak surge power rating for SZMMSZ27ET1G?
SZMMSZ27ET1G supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs pulse waveform at 25 °C ambient, as defined in the Absolute Maximum Ratings table. This rating enables reliable protection against ISO 7637-2 load-dump transients in 12 V vehicle electrical systems without device failure.
Does SZMMSZ27ET1G have Pb-free packaging?
Yes, SZMMSZ27ET1G uses a Pb-free SOD-123 package compliant with RoHS Directive 2011/65/EU. The "G" suffix in the part number confirms lead-free construction, and the device supports standard lead-free reflow profiles with a maximum soldering temperature of 260 °C for 10 seconds, as verified in the Mechanical Characteristics section.
What is the reverse leakage current specification for SZMMSZ27ET1G?
SZMMSZ27ET1G exhibits a maximum reverse leakage current of 0.05 µA at VR = 25 V and TA = 25 °C, per the Electrical Characteristics table. This ultra-low leakage ensures minimal power loss in always-on circuits such as battery-backed sensors or standby voltage monitors where quiescent current must remain below 100 nA.
SZMMSZ27ET1G 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
SZMMSZ27ET1G FAQ
1.How can I place an order for SZMMSZ27ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ27ET1G 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 SZMMSZ27ET1G reliable?
The price and inventory of SZMMSZ27ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ27ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ27ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ27ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ27ET1G?
SZMMSZ27ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ27ET1G 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 SZMMSZ27ET1G?
For technical support, including SZMMSZ27ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ27ET1G requirements.
6.How does Aetrix verify that SZMMSZ27ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ27ET1G 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 SZMMSZ27ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ27ET1G?
All SZMMSZ27ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ27ET1G, 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 SZMMSZ27ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ27ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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