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onsemi MMSZ5258BT1
- Part No.:
- MMSZ5258BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5258BT1.pdf
- Description:
- DIODE ZENER 36V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,561
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Product details
Overview
MMSZ5258BT1 from ON Semiconductor is a 36 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 70 Ω maximum dynamic impedance at 3.4 mA test current and 0.1 µA reverse leakage at 27 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5258BT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode/anode terminal roles, SOD−123 footprint compatibility, and direct alternatives for voltage regulation design validation.
Technical Context
This device operates as a two-terminal silicon Zener diode with stable reverse breakdown at nominal 36 V under thermal equilibrium conditions (TL = 30°C ±1°C), exhibiting a temperature coefficient of +32 mV/°C typical across −55°C to +150°C. Its 700 °C/W junction-to-ambient thermal resistance enables predictable power derating above 75°C ambient.
The MMSZ5258BT1 features Class 3 ESD robustness (>16 kV HBM), Pb−free construction compliant with RoHS, and a defined cathode band polarity marking. It is not a voltage reference IC but a discrete passive regulator requiring external current limiting for stable operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V min / 36 V nominal / 37.8 V max @ IZT = 3.4 mA - defines regulated output range under specified test current |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - usable steady-state power limit on standard FR−5 PCB; derates 6.7 mW/°C above 75°C |
| Zener Impedance (ZZT) | 70 Ω max @ IZT = 3.4 mA - determines output voltage stability under load current variation |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 27 V - ensures minimal quiescent current in standby regulation or clamping |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robust handling during automated assembly without additional protection |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, Style 1), 1.40–1.80 mm width, 2.54–2.84 mm length, 0.94–1.35 mm height, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Breakdown Anode Terminal | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Anode) | Reference Ground Terminal | Typically tied to system ground or lower potential; completes bias path for current limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Equilibrium Zener Spec | VZ measured at TL = 30°C ±1°C - ensures repeatable voltage calibration independent of transient self-heating |
| Automated Assembly Optimized | Void-free transfer-molded case with UL 94 V−0 flammability rating - compatible with reflow and wave soldering processes |
| High-Density Footprint | SOD−123 package occupies <1.5 mm² PCB area - enables compact voltage reference placement near sensitive analog circuitry |
| Pb−Free & AEC−Q101 Capable | SZ-prefix variant available; meets automotive qualification requirements for stress testing and PPAP documentation |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters operating from 24 V DC supply. IC Role / Device Role / Timing Role: Discrete Zener voltage reference providing fixed 36 V rail for op-amp biasing and ADC reference scaling. Use Value: Maintains <±1% output accuracy over −40°C to +85°C due to known +32 mV/°C TC and low 0.1 µA leakage at 27 V. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Passive overvoltage protection element shunting excess energy to ground when VBUS exceeds 36 V. Use Value: Limits peak voltage to ≤37.8 V with 70 Ω dynamic impedance, preventing damage to downstream USB PHY ICs rated for 3.3 V I/O. |
| Low-Power IoT Node Voltage Reference | Programmable Logic Supply Clamp |
Use Scenario: Generating stable 36 V bias for RF power amplifier gate control in battery-powered LoRaWAN end-nodes. IC Role / Device Role / Timing Role: Precision Zener regulator supplying gate voltage to depletion-mode MOSFETs in ultra-low-quiescent circuits. Use Value: Draws only 3.4 mA test current and leaks <0.1 µA below 27 V, extending coin-cell battery life beyond 5 years in sleep mode. |
Use Scenario: Protecting FPGA configuration I/O banks from accidental 36 V misconnection during lab debugging of industrial PLC modules. IC Role / Device Role / Timing Role: Fail-safe clamp diode placed between VCCIO and ground to absorb fault energy before latch-up occurs. Use Value: Withstands non-repetitive surge power up to 100 W (1 ms pulse) per Figure 4, surviving multiple accidental overvoltage events. |
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-C36LT1G | Same 36 V ±5%, but SOT−23 package (higher RJA = 375 °C/W); 400 mW PD rating | Less thermal margin in high-density layouts; requires larger copper pour for equivalent power handling | Select when SOT−23 footprint is already standardized and board space permits reduced thermal performance. |
| MMSZ5258CT1G | Identical SOD−123 package and 36 V nominal, but ±2% tolerance (35.28–36.72 V) and same 70 Ω ZZT | Tighter regulation required in precision feedback loops where ±5% variation causes >1 LSB error in 10-bit DAC references | Choose when absolute voltage accuracy outweighs cost sensitivity and tighter tolerance justifies BOM revision. |
Compared with MMSZ5258BT1, BZX84-C36LT1G trades package compatibility for slightly lower power rating and higher thermal resistance, while MMSZ5258CT1G retains identical form factor and improves voltage tolerance at no thermal penalty-making it a drop-in upgrade for accuracy-critical designs.
Availability
MMSZ5258BT1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage clamp, and low-power IoT node voltage reference applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MMSZ5258BT1 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic devices for automotive, industrial, and consumer markets.
The MMSZ52xxxT1G series was designed for general-purpose medium-current Zener regulation in space-constrained surface-mount applications, emphasizing thermal stability, automated assembly compatibility, and AEC−Q101 readiness.
FAQ
What is the exact Zener voltage tolerance for MMSZ5258BT1?
The MMSZ5258BT1 has a ±5% tolerance on its nominal 36 V Zener voltage, meaning the actual measured VZ falls between 34.2 V and 37.8 V when tested at IZT = 3.4 mA and thermal equilibrium (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official ON Semiconductor datasheet.
Does MMSZ5258BT1 require a current-limiting resistor in circuit?
Yes, MMSZ5258BT1 must be used with an external series current-limiting resistor to establish the required test current (3.4 mA) and prevent thermal runaway. Without proper biasing, the diode cannot regulate at its specified 36 V and may exceed its 500 mW power rating. The resistor value is calculated using (VIN − 36 V)/3.4 mA, adjusted for worst-case VZ and temperature drift.
Is MMSZ5258BT1 suitable for automotive applications?
MMSZ5258BT1 itself is not automotive-qualified, but its SZ-prefixed variant SZMMSZ5258BT1G is AEC−Q101 qualified and PPAP capable. The base MMSZ5258BT1 shares identical electrical specs and SOD−123 packaging, yet lacks the controlled manufacturing site and change documentation required for automotive use-so MMSZ5258BT1 is recommended only for industrial and commercial designs.
What is the maximum reverse leakage current for MMSZ5258BT1?
The maximum reverse leakage current for MMSZ5258BT1 is 0.1 µA at VR = 27 V and TA = 25°C, as specified in the Electrical Characteristics table. This low leakage ensures minimal power loss in battery-powered applications and maintains regulation accuracy when used in high-impedance reference networks.
Can MMSZ5258BT1 be used as a replacement for MMSZ5258CT1G?
MMSZ5258BT1 can functionally replace MMSZ5258CT1G in non-precision applications, but not vice versa without design review. The CT1G version offers ±2% tolerance (35.28–36.72 V), while the BT1 version has ±5% (34.2–37.8 V). If your circuit relies on tight voltage accuracy-such as in ADC reference or feedback loop sensing-the MMSZ5258BT1 may introduce unacceptable error, making direct substitution invalid without verification.
MMSZ5258BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 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
MMSZ5258BT1 FAQ
1.How can I place an order for MMSZ5258BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5258BT1 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 MMSZ5258BT1 reliable?
The price and inventory of MMSZ5258BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5258BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5258BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5258BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5258BT1?
MMSZ5258BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5258BT1 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 MMSZ5258BT1?
For technical support, including MMSZ5258BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5258BT1 requirements.
6.How does Aetrix verify that MMSZ5258BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5258BT1 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 MMSZ5258BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5258BT1?
All MMSZ5258BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5258BT1, 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 MMSZ5258BT1 part is unused and in its original packaging.
Return procedure for MMSZ5258BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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