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onsemi MMSZ27ET1
- Part No.:
- MMSZ27ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ27ET1.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,461
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Product details
Overview
MMSZ27ET1 from onsemi is a 27 V ±5% Zener 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 18.9 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.
For engineers reviewing the MMSZ27ET1 datasheet, pinout, applications, or equivalent options, this device is selected for stable 27 V regulation in space-constrained PCBs where ESD robustness (>16 kV HBM), AEC-Q101 qualification, and tight voltage tolerance are required.
Technical Context
This Zener diode operates in reverse breakdown mode with nominal Zener voltage of 27 V measured at IZT = 5 mA, exhibiting a temperature coefficient near +0.045 mV/°C per typical curve data for 27 V devices. Its thermal resistance junction-to-ambient is 340 °C/W, limiting continuous power handling under still-air conditions.
The device features a cathode band marking, conforms to UL 94 V-0 flammability rating, and supports reflow soldering up to 260 °C for 10 seconds. Peak surge capability is 225 W (8 × 20 µs pulse), enabling transient suppression in low-energy protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, ±5% tolerance - ensures stable 26.2–27.8 V regulation at 5 mA test current |
| Power Dissipation (PD) | 500 mW on FR-5 board at TL = 75 °C - defines maximum steady-state power before thermal derating begins |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 5 mA - indicates voltage stability under small-signal AC variations |
| Reverse Leakage (IR) | 0.05 µA max at VR = 18.9 V - confirms minimal quiescent current in clamping standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into ESD-sensitive signal paths without external protection |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm) - supports high-density automated assembly and IPC-compliant reflow profiles |
| Junction Temp Range | −55 °C to +150 °C - suitable for automotive under-hood and industrial ambient environments |
Pinout & Package
SOD-123 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and cathode polarity indicated by a band. Maximum soldering temperature is 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output or higher-potential node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes current path during breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Pb-Free Construction | RoHS-compliant SOD-123 package with no lead content, meeting global environmental directives |
| High ESD Robustness | Class 3 Human Body Model (>16 kV) eliminates need for discrete ESD diodes in many interface circuits |
| Optimized Thermal Performance | Junction-to-lead thermal resistance of 150 °C/W enables localized heat transfer to PCB copper |
| Stable Low-Current Regulation | Specified VZ at 5 mA and 1 mA test points supports accurate biasing in micro-power designs |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Stabilizing reference voltage for 24 V rail monitoring in factory automation sensors. IC Role / Device Role / Timing Role: Zener voltage reference providing precise 27 V clamp for ADC input protection and bias generation. Use Value: Maintains ±0.5 V regulation accuracy across −40 °C to +125 °C ambient, reducing calibration drift in analog front-ends. |
Use Scenario: Overvoltage protection for LIN bus transceiver supply lines in door module ECUs. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced spikes above 27 V during load dump events. Use Value: Withstands 225 W surge pulses (8 × 20 µs) without degradation, extending transceiver lifetime in noisy vehicle environments. |
| Medical Portable Diagnostic Equipment | Telecom Power Sequencing Circuit |
Use Scenario: Providing isolated 27 V reference for battery-charged portable ultrasound front-end bias rails. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable bias point for op-amp gain stages. Use Value: 0.05 µA leakage at 18.9 V minimizes standby current draw, extending single-charge operating time by >8%. |
Use Scenario: Enabling controlled power-up sequencing between 24 V and 3.3 V domains in optical line cards. IC Role / Device Role / Timing Role: Voltage threshold detector triggering enable signals when main rail exceeds 27 V. Use Value: ±5% VZ tolerance and low ZZT ensure repeatable turn-on timing within ±120 ms across production lots. |
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 SOT-23 package (higher RJA = 375 °C/W); 100 Ω ZZT @ 5 mA | Less thermal margin in high-density layouts; requires larger pad area for equivalent power handling | Select when existing SOT-23 footprint must be retained and peak power demands are ≤350 mW |
| MMSZ27ET1G | Identical electrical specs and SOD-123 package; differs only in Pb-free suffix "G" and tape/reel packaging | No functional difference; fully interchangeable in circuit design and layout | Preferred for new designs requiring RoHS compliance and latest manufacturing traceability |
Compared with BZX84-C27LT1G, MMSZ27ET1 offers lower thermal resistance and tighter ZZT, improving regulation stability under thermal stress; versus MMSZ27ET1G, it shares identical performance but lacks the "G" suffix indicating Pb-free compliance per latest onsemi standards.
Availability
MMSZ27ET1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and medical portable diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ27ET1 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxET1 series belongs to onsemi's precision Zener voltage regulator product line, engineered for compact, high-reliability voltage reference and clamping in space- and power-constrained systems.
FAQ
What is the Zener voltage tolerance and test condition for MMSZ27ET1?
MMSZ27ET1 has a nominal Zener voltage of 27 V with ±5% tolerance, measured at IZT = 5 mA with 1 ms pulse width. This ensures consistent regulation across production units and supports reliable design margins in voltage-reference applications where MMSZ27ET1 is deployed.
Does MMSZ27ET1 meet automotive qualification standards?
Yes, MMSZ27ET1 is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications such as body control modules and powertrain subsystems. The qualification covers stress testing for temperature cycling, humidity, and mechanical shock - all verified for the MMSZ27ET1 device.
What is the maximum surge power rating of MMSZ27ET1 and under what waveform?
MMSZ27ET1 supports a peak nonrepetitive surge power of 225 W under an 8 × 20 µs rectangular pulse waveform at TA = 25 °C. This rating enables MMSZ27ET1 to absorb transient energy in low-energy overvoltage events without failure or parameter shift.
How does the SOD-123 package of MMSZ27ET1 impact PCB layout and thermal design?
The SOD-123 package (1.60 × 2.69 × 1.16 mm) allows high-density placement and supports standard reflow profiles. With RJA = 340 °C/W, MMSZ27ET1 requires ≥25 mm² of 1-oz copper pour connected to the cathode pad for full 500 mW dissipation at 75 °C - a key constraint in MMSZ27ET1 layout implementation.
Is MMSZ27ET1 RoHS compliant and what does the "T1" suffix indicate?
MMSZ27ET1 is RoHS compliant and uses Pb-free materials per onsemi's Pb-Free strategy. The "T1" suffix denotes tape-and-reel packaging in 3,000-unit reels; it does not imply Pb-free status - that is confirmed separately via the "G" suffix in MMSZ27ET1G, whereas MMSZ27ET1 meets legacy RoHS requirements without the "G" designation.
MMSZ27ET1 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
MMSZ27ET1 FAQ
1.How can I place an order for MMSZ27ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ27ET1 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 MMSZ27ET1 reliable?
The price and inventory of MMSZ27ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ27ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ27ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ27ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ27ET1?
MMSZ27ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ27ET1 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 MMSZ27ET1?
For technical support, including MMSZ27ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ27ET1 requirements.
6.How does Aetrix verify that MMSZ27ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ27ET1 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 MMSZ27ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ27ET1?
All MMSZ27ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ27ET1, 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 MMSZ27ET1 part is unused and in its original packaging.
Return procedure for MMSZ27ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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