My Inquiry
My Account
onsemi MMSZ5259ET1
- Part No.:
- MMSZ5259ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5259ET1.pdf
- Description:
- DIODE ZENER 39V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,787
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5259ET1 from onsemi is a 39 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 800 Ω maximum dynamic impedance at 3.2 mA test current and 0.1 µA reverse leakage at 30 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the MMSZ5259ET1 datasheet, pinout, applications, or equivalent options, this part is selected for stable 39 V regulation in space-constrained DC biasing, sensor excitation, and supply rail clamping where thermal derating and ESD robustness (>16 kV HBM) are critical.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its cathode–anode terminals. Its 39 V nominal Zener voltage is specified at 3.2 mA test current (IZT), with temperature coefficient optimized for mid-range voltage devices (≈+3.2 mV/°C typical).
It exhibits 800 Ω dynamic impedance at IZT and 0.25 µA leakage at VR = 30 V, supporting stable regulation under light-load conditions. The SOD-123 package enables automated placement while limiting junction-to-ambient thermal resistance to 340 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.05 V (min) to 40.95 V (max) at 3.2 mA - defines usable regulation window for 39 V nominal design |
| Power Dissipation (PD) | 500 mW at TL = 75 °C - sets maximum continuous power on standard FR-5 PCB without forced cooling |
| Zener Impedance (ZZT) | 800 Ω max at IZT = 3.2 mA - determines output voltage variation under small-signal load changes |
| Reverse Leakage (IR) | 0.1 µA max at VR = 30 V - ensures minimal error current in high-impedance reference nodes |
| ESD Rating | Class 3 (>16 kV) per HBM - supports handling and assembly without special ESD controls |
| Junction Temp Range | −55 °C to +150 °C - enables operation in automotive under-hood and industrial ambient 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes bias path for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current bias networks without external heat sinking on standard PCBs |
| ±5% Zener Voltage Tolerance | Provides predictable 39 V regulation without post-production trimming in cost-sensitive applications |
| ESD Robustness >16 kV HBM | Reduces risk of field failure due to handling or system-level ESD events |
| Small SOD-123 Footprint | Supports high-density layouts in portable and IoT edge devices with limited board area |
| Pb-Free Construction | Meets RoHS compliance requirements without sacrificing thermal or electrical performance |
Applications
| Industrial Sensor Signal Conditioning | Automotive Cabin Control Module |
|---|---|
Use Scenario: Biasing a 4–20 mA current-loop transmitter IC requiring stable 39 V reference for DAC headroom. IC Role / Device Role / Timing Role: Precision voltage reference source establishing upper rail for analog front-end. Use Value: Maintains <±1% output accuracy across −40 °C to +85 °C ambient due to low TC and tight tolerance. |
Use Scenario: Clamping microcontroller I/O pins against load-dump transients in HVAC control units. IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy to ground. Use Value: Withstands 225 W nonrepetitive surges (8 × 20 µs) without degradation, meeting ISO 7637-2 Pulse 5a immunity. |
| Medical Wearable Power Management | Smart Meter Reference Subsystem |
Use Scenario: Providing regulated bias to low-noise op-amps in ECG front-end amplifiers. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA) voltage reference stabilizing amplifier gain-setting network. Use Value: Prevents drift-induced baseline wander in sub-µV signal paths due to negligible reverse current contribution. |
Use Scenario: Generating stable 39 V reference for ADC calibration in polyphase electricity meters. IC Role / Device Role / Timing Role: Primary voltage reference for ratiometric measurement of mains voltage via resistive divider. Use Value: Delivers long-term stability (<50 ppm/°C TC) and low dynamic impedance to minimize ADC INL errors. |
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-C39 | Same 39 V nominal rating but SOT-23 package; 350 mW rating; higher ZZT (1000 Ω) | Lower power handling and larger footprint than SOD-123; less suitable for high-density layouts | Select when legacy SOT-23 footprint compatibility is required and power demand stays below 350 mW |
| MMBZ5259ELT1G | Identical electrical specs but in smaller SOT-23-3 (leadless) package; same 500 mW rating on FR-5 | Requires different stencil and reflow profile; not drop-in compatible due to different land pattern | Choose for ultra-compact designs where SOT-23-3 mounting is already standardized |
Compared with BZX84-C39 and MMBZ5259ELT1G, the MMSZ5259ET1 offers optimal balance of SOD-123 manufacturability, 500 mW thermal capability, and 800 Ω low-impedance regulation-making it preferred for new designs prioritizing board density and thermal margin.
Availability
MMSZ5259ET1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive cabin electronics, medical wearables, smart metering, and portable instrumentation requiring stable component supply with full traceability and lifecycle support.
Supply support for MMSZ5259ET1 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 MMSZ52xxET1G series was designed specifically for general-purpose, medium-current Zener regulation in space-constrained surface-mount applications-emphasizing manufacturability, reliability, and broad voltage coverage from 2.4 V to 110 V.
FAQ
What is the exact Zener voltage range for MMSZ5259ET1 at 25 °C?
The MMSZ5259ET1 has a guaranteed Zener voltage range of 37.05 V (minimum) to 40.95 V (maximum) at 3.2 mA test current and 25 °C ambient, reflecting its ±5% tolerance around the 39 V nominal value as specified in the onsemi datasheet revision 10.
Can MMSZ5259ET1 be used in automotive applications?
Yes, the MMSZ5259ET1 is qualified to AEC-Q101 when ordered as SZMMSZ5259ET1G (automotive-grade variant); the standard MMSZ5259ET1 meets industrial temperature range (−55 °C to +150 °C) and ESD robustness (>16 kV HBM), making it suitable for non-safety-critical automotive cabin modules.
What is the maximum surge power rating for MMSZ5259ET1?
The MMSZ5259ET1 supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs pulse waveform at TL ≤ 25 °C, enabling transient overvoltage protection in power supply input stages and I/O line clamping circuits.
How does the SOD-123 package affect thermal performance of MMSZ5259ET1?
The SOD-123 package gives the MMSZ5259ET1 a junction-to-ambient thermal resistance of 340 °C/W on FR-5 board, limiting continuous power dissipation to 500 mW at 75 °C lead temperature-designers must apply derating above that point using the 6.7 mW/°C slope specified in the datasheet.
Is MMSZ5259ET1 RoHS compliant and lead-free?
Yes, the MMSZ5259ET1 is Pb-free and RoHS compliant, as confirmed by the "G" suffix in its full orderable part number (MMSZ5259ET1G) and explicit statement in the onsemi datasheet; the device uses environmentally compliant materials without compromising solderability or reliability.
MMSZ5259ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 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
MMSZ5259ET1 FAQ
1.How can I place an order for MMSZ5259ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5259ET1 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 MMSZ5259ET1 reliable?
The price and inventory of MMSZ5259ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5259ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5259ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5259ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5259ET1?
MMSZ5259ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5259ET1 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 MMSZ5259ET1?
For technical support, including MMSZ5259ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5259ET1 requirements.
6.How does Aetrix verify that MMSZ5259ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5259ET1 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 MMSZ5259ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5259ET1?
All MMSZ5259ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5259ET1, 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 MMSZ5259ET1 part is unused and in its original packaging.
Return procedure for MMSZ5259ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5259ET1 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
