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onsemi MMSZ5237ET1G
- Part No.:
- MMSZ5237ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5237ET1G.pdf
- Description:
- DIODE ZENER 8.2V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
MMSZ5237ET1G from onsemi is a 500 mW surface-mount Zener diode in SOD-123 package, providing precise 8.2 V ±5% reverse breakdown regulation at 20 mA test current, with 8 Ω dynamic impedance and 0.25 µA leakage at 6.5 V, used for voltage reference and overvoltage protection in power supply rails and analog signal conditioning circuits.
For engineers reviewing the MMSZ5237ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (RJL = 150 °C/W), peak surge capability (225 W @ 8 × 20 µs), and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse-biased avalanche breakdown in silicon. Its Zener voltage is specified at IZT = 20 mA with nominal 8.2 V and ±5% tolerance, and it maintains stable regulation across −55 °C to +150 °C junction temperature range.
Thermal performance is defined by RJL = 150 °C/W (junction-to-lead) and RJA = 340 °C/W (junction-to-ambient on FR-5 board), enabling predictable derating above 75 °C ambient. The SOD-123 package supports automated placement and reflow soldering at 260 °C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79–8.61 V at IZT = 20 mA; ensures stable 8.2 V reference under typical bias conditions |
| Zener Impedance (ZZT) | 8 Ω max at IZT = 20 mA; low dynamic resistance minimizes output voltage variation under load transients |
| Power Dissipation (PD) | 500 mW on FR-5 board at TL = 75 °C; defines continuous DC operating limit before thermal derating begins |
| Leakage Current (IR) | 0.25 µA max at VR = 6.5 V; guarantees minimal parasitic current draw in standby or high-impedance sensing nodes |
| Peak Surge Power (Ppk) | 225 W for 8 × 20 µs pulse; enables transient overvoltage clamping without failure in ESD or inductive spike events |
| ESD Rating | Class 3 (>16 kV HBM); supports robust handling and operation in unshielded industrial environments |
| Junction Temp Range | −55 °C to +150 °C; validated for under-hood automotive and industrial control applications |
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. Lead-free (Pb-Free) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-bias voltage applied between cathode and anode to initiate Zener conduction |
| 2 (Non-banded End) | Anode | Typically tied to ground or lower-potential rail; completes current path during regulation or clamping operation |
Key Features
| Feature | Design Value |
|---|---|
| Automated assembly optimized package | SOD-123 footprint enables high-speed pick-and-place and reflow compatibility per IPC-7351 standards |
| High-density mounting capability | Compact 1.60 × 2.69 mm outline allows placement in space-constrained PCB layouts near IC power pins |
| AEC-Q101 qualified | Validated for automotive electronics including body control modules and sensor interfaces requiring extended temperature and life testing |
| Low-leakage Zener regulation | 0.25 µA max IR at VR = 6.5 V ensures negligible error contribution in precision reference divider networks |
| Stable temperature coefficient | TCZ ≈ +3.5 mV/°C near 8.2 V (inferred from Figure 1 trend), supporting predictable drift compensation in analog designs |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Providing stable 8.2 V reference for ADC voltage dividers and op-amp bias networks in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing known potential for measurement accuracy and signal scaling. Use Value: ±5% VZ tolerance and 8 Ω ZZT ensure <±10 mV error contribution at 20 mA, directly improving 12-bit ADC effective resolution. | Use Scenario: Clamping transient spikes on 9 V battery-backed microcontroller reset lines exposed to ESD or relay coil flyback. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting surge current away from sensitive logic inputs during fault events. Use Value: 225 W peak surge rating and Class 3 ESD immunity enable reliable operation without external TVS cascading in cost-sensitive consumer designs. |
| Automotive Sensor Biasing | Linear Regulator Feedback Divider |
Use Scenario: Generating stable bias voltage for Hall-effect position sensors in electric power steering ECUs operating at 125 °C under hood. IC Role / Device Role / Timing Role: Temperature-stable Zener source supplying excitation current to sensor bridges while maintaining accuracy across full automotive temp range. Use Value: Validated −55 °C to +150 °C operation and AEC-Q101 qualification guarantee long-term stability in harsh under-hood environments. | Use Scenario: Setting output voltage of adjustable LDOs (e.g., LM317) via feedback resistor network where reference node must remain stable under varying load currents. IC Role / Device Role / Timing Role: Precision shunt element defining regulation setpoint by sinking small, consistent current into the feedback node. Use Value: Low 8 Ω ZZT and 0.25 µA leakage minimize output voltage drift caused by feedback current variations across line/load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C8V2 | Same 8.2 V nominal, ±5% tolerance, but rated at 300 mW and packaged in SOD-323 (smaller footprint) | Lower power rating limits use in higher-current reference or clamp roles; SOD-323 may require layout revision | Select when board space is critical and dissipation stays below 300 mW |
| 1N4737A | 8.2 V ±5%, but through-hole DO-41 package and 1 W power rating; higher thermal mass but no SMT compatibility | Not suitable for automated assembly; requires manual soldering or wave process; better for prototyping or low-volume repair | Select only for legacy through-hole designs or where higher continuous power is mandatory |
Compared with BZX584C8V2 and 1N4737A, the MMSZ5237ET1G offers optimal balance of SMT manufacturability, 500 mW power handling, and AEC-Q101 qualification-making it preferred for volume automotive and industrial PCB production where reliability and assembly efficiency are jointly prioritized.
Availability
MMSZ5237ET1G is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply reference, and overvoltage clamp protection requiring stable component supply, full traceability, and lifecycle continuity support.
Supply support for MMSZ5237ET1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxET1G series belongs to onsemi's general-purpose Zener regulator product line, engineered for high-reliability voltage reference and transient suppression in space-constrained, thermally demanding applications.
FAQ
What is the Zener voltage tolerance of the MMSZ5237ET1G?
The MMSZ5237ET1G has a standard Zener voltage tolerance of ±5% at IZT = 20 mA, resulting in a guaranteed range of 7.79 V to 8.61 V. This tolerance is measured under thermal equilibrium at lead temperature TL = 30 °C ±1 °C and applies across the full operating temperature range. The MMSZ5237ET1G datasheet specifies this tolerance explicitly in the Electrical Characteristics table on page 2.
Is the MMSZ5237ET1G suitable for automotive applications?
Yes, the MMSZ5237ET1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as sensor biasing, ECU voltage monitoring, and reset circuit protection. It operates reliably from −55 °C to +150 °C and meets stringent automotive reliability requirements. The MMSZ5237ET1G is explicitly listed in onsemi's automotive-grade Zener portfolio with full qualification documentation.
What is the maximum surge power rating for the MMSZ5237ET1G?
The MMSZ5237ET1G has a peak nonrepetitive surge power rating of 225 W for an 8 × 20 µs rectangular pulse waveform at TA = 25 °C. This rating is defined in the Maximum Ratings table and verified per Figure 11 in the datasheet. The MMSZ5237ET1G uses this capability to safely clamp transient overvoltages without degradation in power supply and interface protection circuits.
Does the MMSZ5237ET1G have a Pb-Free package?
Yes, the "G" suffix in MMSZ5237ET1G denotes a Pb-Free (RoHS-compliant) package. The device uses a void-free, transfer-molded thermosetting plastic case with corrosion-resistant, easily solderable finish. The MMSZ5237ET1G complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and supports standard reflow profiles up to 260 °C for 10 seconds.
How does the MMSZ5237ET1G compare to the MMSZ5236ET1G in terms of Zener voltage?
The MMSZ5237ET1G has a nominal Zener voltage of 8.2 V (range: 7.79–8.61 V), while the MMSZ5236ET1G is rated at 7.5 V (range: 7.13–7.88 V). Both share identical package (SOD-123), power rating (500 mW), and test conditions (IZT = 20 mA), differing only in breakdown voltage. The MMSZ5237ET1G provides a higher reference point suitable for 9 V rail regulation or tighter margin against 8.4 V logic thresholds, whereas the MMSZ5236ET1G targets 7.5 V systems.
MMSZ5237ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
MMSZ5237ET1G FAQ
1.How can I place an order for MMSZ5237ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5237ET1G 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 MMSZ5237ET1G reliable?
The price and inventory of MMSZ5237ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5237ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5237ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5237ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5237ET1G?
MMSZ5237ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5237ET1G 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 MMSZ5237ET1G?
For technical support, including MMSZ5237ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5237ET1G requirements.
6.How does Aetrix verify that MMSZ5237ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5237ET1G 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 MMSZ5237ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5237ET1G?
All MMSZ5237ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5237ET1G, 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 MMSZ5237ET1G part is unused and in its original packaging.
Return procedure for MMSZ5237ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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