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onsemi SZMMSZ56T1G
- Part No.:
- SZMMSZ56T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ56T1G.pdf
- Description:
- DIODE ZENER 56V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,908
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Product details
Overview
SZMMSZ56T1G from onsemi is a 56 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C ambient, with 200 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 39.2 V, used for precision voltage reference and overvoltage protection in automotive power management circuits.
For engineers reviewing the SZMMSZ56T1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, and direct alternatives for automotive-grade voltage clamping and regulation design.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias breakdown at nominal 56 V with ±5% tolerance. It exhibits a positive temperature coefficient above ~5 V, typical for higher-voltage Zeners, and maintains low leakage (≤0.05 μA) up to 39.2 V reverse bias.
Designed for surface-mount assembly on FR−5 boards, it supports automated placement and reflow soldering at 260°C for 10 seconds. Its 150 °C/W junction-to-lead thermal resistance enables effective heat transfer in compact layouts where board-level conduction dominates cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 53.2–58.8 V at IZT = 2 mA; defines precise clamping threshold for 12 V–48 V system rails |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal margining |
| Zener Impedance (ZZT) | 200 Ω max @ IZT = 2 mA; determines voltage regulation stability under load transients |
| Reverse Leakage (IR) | ≤0.05 μA @ VR = 39.2 V; ensures minimal standby current in always-on automotive modules |
| Junction Temp Range | −55°C to +150°C; validated for under-hood and engine-control unit environments |
| ESD Rating | Class 3 (>16 kV HBM); withstands handling and board-level ESD events without parameter shift |
| AEC−Q101 Qualified | Qualified per automotive reliability standard; supports PPAP documentation for Tier-1 production |
Pinout & Package
Package: SOD−123 - surface-mount, 2-lead, void-free thermosetting plastic case (1.60 × 2.69 × 1.16 mm), cathode indicated by polarity band, UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; accepts reverse bias for Zener conduction |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes current path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating on FR−5 Board | Enables robust transient suppression in space-constrained automotive PCBs without heatsinking |
| AEC−Q101 Qualification | Validates long-term reliability under thermal cycling, humidity, and vibration stress for automotive use |
| ESD Class 3 (>16 kV HBM) | Eliminates need for external ESD protection in front-end power input stages |
| SZ Prefix Automotive Traceability | Guarantees controlled manufacturing site, process change notification, and lot-level traceability |
| Pb−Free (RoHS Compliant) | Meets global environmental compliance requirements for vehicle electronics and industrial equipment |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamps 24 V supply rail against load-dump spikes up to 60 V in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Zener voltage clamp protecting LDO regulators and MCU VDD pins from overvoltage. Use Value: Prevents brownout resets and latch-up by limiting rail excursion to ≤58.8 V with <0.05 μA standby drain. | Use Scenario: Shields 24 V digital input channels from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standby shunt regulator absorbing transient energy before reaching optocoupler or logic interface IC. Use Value: Maintains signal integrity with 200 Ω dynamic impedance ensuring <1 V overshoot during 100 ns pulses. |
| Automotive Infotainment Power Sequencing | Medical Diagnostic Equipment Reference |
Use Scenario: Provides stable 56 V reference for high-side switch gate drive bias in infotainment display backlight controllers. IC Role / Device Role / Timing Role: Precision voltage reference source for analog feedback loops requiring ±5% accuracy. Use Value: Delivers 53.2–58.8 V tolerance window compatible with 12-bit ADC monitoring of 48 V auxiliary supplies. | Use Scenario: Stabilizes bias voltage for photodiode amplifier stages in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-noise voltage reference enabling sub-microvolt offset performance in sensor signal chains. Use Value: Achieves <0.05 μA leakage at 39.2 V, minimizing input bias current error in high-impedance transimpedance amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ56T1G | No SZ prefix; commercial-grade qualification, no AEC−Q101 or PPAP support | Acceptable for non-automotive industrial or consumer designs with relaxed reliability requirements | Select when cost sensitivity outweighs automotive traceability and extended temperature validation |
| BZX84-C56LT1G | Same 56 V nominal Zener, but 350 mW rating and 400 Ω ZZT; SOT−23 package (larger footprint) | Lower power handling limits surge immunity in high-energy transients; requires PCB layout revision | Choose only if existing SOT−23 footprint must be reused and 500 mW derating is acceptable |
Compared with MMSZ56T1G and BZX84-C56LT1G, SZMMSZ56T1G uniquely combines AEC−Q101 qualification, 500 mW SOD−123 power density, and ≤0.05 μA leakage-making it the sole option for automotive-grade 56 V clamping where board area, reliability, and regulatory compliance are jointly constrained.
Availability
SZMMSZ56T1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZMMSZ56T1G 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.
SZMMSZ56T1G belongs to the SZMMSZxxxT1G series-a family of AEC−Q101 qualified Zener diodes engineered specifically for automotive power rail stabilization, ESD protection, and voltage reference functions in harsh-environment ECUs.
FAQ
What is the Zener voltage tolerance of SZMMSZ56T1G?
SZMMSZ56T1G has a nominal Zener voltage of 56 V with a standard tolerance of ±5%, resulting in a guaranteed range of 53.2 V to 58.8 V at IZT = 2 mA and TA = 25°C. This tolerance is specified per the onsemi datasheet Rev. 13 and applies across the full operating temperature range of −55°C to +150°C. The SZMMSZ56T1G's tight tolerance supports accurate voltage clamping in safety-critical automotive subsystems.
Is SZMMSZ56T1G qualified for automotive applications?
Yes, SZMMSZ56T1G is AEC−Q101 qualified and PPAP capable, with full traceability via its SZ prefix indicating dedicated automotive process controls and site-specific change management. It meets rigorous stress testing for temperature cycling, humidity, and mechanical shock required for under-hood and chassis-mounted electronics. The SZMMSZ56T1G's qualification documentation is available through onsemi's official automotive support portal.
What is the maximum reverse leakage current for SZMMSZ56T1G?
The maximum reverse leakage current for SZMMSZ56T1G is 0.05 μA at VR = 39.2 V and TA = 25°C, as confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet. This ultra-low leakage ensures minimal power loss in always-on automotive modules and preserves battery life in sleep-mode operation. The SZMMSZ56T1G maintains this specification across its full storage temperature range.
Can SZMMSZ56T1G be used in place of MMSZ56T1G?
SZMMSZ56T1G and MMSZ56T1G share identical electrical specifications including Zener voltage, impedance, and thermal ratings-but SZMMSZ56T1G adds AEC−Q101 qualification, PPAP capability, and enhanced traceability for automotive use. While electrically interchangeable, SZMMSZ56T1G is not a drop-in replacement for MMSZ56T1G in non-automotive contexts unless automotive compliance is explicitly required. The SZMMSZ56T1G's SZ prefix signals stricter process controls and documentation rigor.
What is the thermal resistance from junction to lead for SZMMSZ56T1G?
The thermal resistance from junction to lead (RJL) for SZMMSZ56T1G is 150 °C/W, measured using the infrared scan method per Note 2 in the Maximum Ratings table. This value reflects efficient heat conduction from the die to the PCB copper via the SOD−123 leads, enabling reliable operation at elevated ambient temperatures when mounted on FR−5 board. The SZMMSZ56T1G's RJL supports thermal design margins in compact automotive modules.
SZMMSZ56T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ56T1G FAQ
1.How can I place an order for SZMMSZ56T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ56T1G 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 SZMMSZ56T1G reliable?
The price and inventory of SZMMSZ56T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ56T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ56T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ56T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ56T1G?
SZMMSZ56T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ56T1G 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 SZMMSZ56T1G?
For technical support, including SZMMSZ56T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ56T1G requirements.
6.How does Aetrix verify that SZMMSZ56T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ56T1G 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 SZMMSZ56T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ56T1G?
All SZMMSZ56T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ56T1G, 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 SZMMSZ56T1G part is unused and in its original packaging.
Return procedure for SZMMSZ56T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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