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onsemi MMSZ27ET1G
- Part No.:
- MMSZ27ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ27ET1G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,932
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Product details
Overview
MMSZ27ET1G from onsemi is a 27 V ±5% Zener diode in SOD-123 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 21 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ27ET1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, and direct alternatives for automotive and industrial voltage reference designs.
Technical Context
The MMSZ27ET1G operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 27 V, specified under 5 mA Zener test current (IZT) and measured with 1 kHz AC signal at 0.1× DC bias. Its temperature coefficient is +6.5 mV/°C near 27 V, enabling stable regulation across −55 °C to +150 °C junction range.
It features Class 3 ESD robustness (>16 kV HBM), 225 W nonrepetitive surge capability (8 × 20 µs pulse), and Pb-free SOD-123 packaging optimized for automated surface-mount assembly on high-density PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V min / 27 V nom / 28.35 V max at IZT = 5 mA - defines regulated output tolerance band for feedback or clamp circuits |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 5 mA - determines load regulation error and ripple rejection in shunt regulator topologies |
| Reverse Leakage (IR) | 0.05 µA max at VR = 21 V - ensures minimal quiescent current draw in battery-powered voltage monitor circuits |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR-5 board - sets maximum continuous power handling before thermal derating begins |
| Thermal Resistance (RJA) | 340 °C/W - indicates junction-to-ambient heat transfer efficiency on standard PCB layout |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling during automated assembly and field operation without external protection |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity, and mechanical stress testing |
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, rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in compact shunt regulators without heatsinking on standard FR-5 PCBs |
| ±5% Zener Voltage Tolerance | Supports cost-sensitive applications requiring predictable clamping without trimming circuitry |
| Low Dynamic Impedance (80 Ω) | Minimizes output voltage variation under changing load current in reference supply designs |
| AEC-Q101 Qualification | Validates suitability for automotive body electronics, infotainment power rails, and ADAS sensor interfaces |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer end equipment |
Applications
| Automotive Sensor Reference | Industrial Analog Input Protection |
|---|---|
|
Use Scenario: Providing stable 27 V reference for pressure or temperature sensor excitation in engine control units. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting ADC front-end inputs. Use Value: Maintains <±1% reference accuracy over −40 °C to +125 °C ambient due to matched TC and low leakage. |
Use Scenario: Clamping transient surges on 24 V industrial PLC analog input channels exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-acting overvoltage protector limiting input to safe levels before op-amp saturation. Use Value: Absorbs 225 W surge energy (8 × 20 µs) without degradation, preserving signal chain integrity. |
| Portable Instrumentation Power Rail | Medical Device Voltage Monitor |
|
Use Scenario: Regulating auxiliary 27 V rail for precision DACs and op-amps in handheld test equipment. IC Role / Device Role / Timing Role: Low-noise shunt regulator supplying clean bias to sensitive analog stages. Use Value: Delivers 0.05 µA leakage and 80 Ω ZZT, minimizing drift and improving measurement resolution. |
Use Scenario: Monitoring battery voltage thresholds in portable diagnostic devices with strict power budget constraints. IC Role / Device Role / Timing Role: Low-current Zener-based comparator reference for undervoltage lockout detection. Use Value: Draws only 5 µA typical at 21 V bias, extending battery life while maintaining reliable trip-point accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V nominal, ±5% tolerance, but 300 mW rating and higher ZZT (100 Ω) | Limited to lower-power circuits; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and thermal margin needs |
| SZMMSZ27ET1G | Identical electrical specs and package; includes SZ prefix denoting automotive-specific traceability and PPAP support | Required for Tier-1 automotive BOMs needing full process documentation and change control | Choose when OEM sourcing mandates AEC-Q101 plus documented manufacturing site control |
Compared with BZX84-C27LT1G and SZMMSZ27ET1G, the MMSZ27ET1G offers optimal balance of 500 mW power headroom, AEC-Q101 validation, and industrial-grade ESD robustness-making it preferred for automotive body controllers and ruggedized industrial sensors where long-term reliability is critical.
Availability
MMSZ27ET1G is available at Aetrix Electronics and suitable for automotive sensor reference, industrial analog input protection, and portable instrumentation power rail applications requiring stable component supply and long-lifecycle support.
Supply support for MMSZ27ET1G 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 power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxET1G series targets cost-effective, space-constrained voltage regulation and protection in automotive and industrial systems, emphasizing AEC-Q101 compliance, high-density SOD-123 packaging, and wide Zener voltage coverage (2.4 V–56 V).
FAQ
What is the Zener voltage tolerance of MMSZ27ET1G?
The MMSZ27ET1G has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, meaning the actual breakdown voltage falls between 25.65 V and 28.35 V when tested at IZT = 5 mA and TA = 25 °C. This tolerance is guaranteed per onsemi's datasheet revision 8 and applies across the full operating temperature range.
Is MMSZ27ET1G suitable for automotive applications?
Yes, the MMSZ27ET1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as sensor reference supplies, ECU power rail clamping, and infotainment system voltage monitoring. Its qualification covers temperature cycling, mechanical shock, and humidity testing required for under-hood and cabin environments.
What is the maximum surge power rating for MMSZ27ET1G?
The MMSZ27ET1G supports a peak nonrepetitive surge power of 225 W for an 8 × 20 µs pulse waveform at TA = 25 °C. This rating enables robust transient suppression in industrial and automotive systems exposed to load dump or inductive kick events without device failure.
Does MMSZ27ET1G have Pb-free packaging?
Yes, the "G" suffix in MMSZ27ET1G denotes a Pb-free, RoHS-compliant SOD-123 package. The device uses lead-free terminations and conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) 1, supporting standard reflow profiles up to 260 °C for 10 seconds.
What is the thermal resistance of MMSZ27ET1G?
The MMSZ27ET1G has a junction-to-ambient thermal resistance (RJA) of 340 °C/W when mounted on an FR-5 board per onsemi's recommended footprint. This value is measured via infrared scanning and defines how much temperature rise occurs per milliwatt of dissipated power under standard board conditions.
MMSZ27ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ27ET1G FAQ
1.How can I place an order for MMSZ27ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ27ET1G 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 MMSZ27ET1G reliable?
The price and inventory of MMSZ27ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ27ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ27ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ27ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ27ET1G?
MMSZ27ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ27ET1G 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 MMSZ27ET1G?
For technical support, including MMSZ27ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ27ET1G requirements.
6.How does Aetrix verify that MMSZ27ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ27ET1G 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 MMSZ27ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ27ET1G?
All MMSZ27ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ27ET1G, 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 MMSZ27ET1G part is unused and in its original packaging.
Return procedure for MMSZ27ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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