My Inquiry
My Account
onsemi SZMMSZ4681T1G
- Part No.:
- SZMMSZ4681T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ4681T1G.pdf
- Description:
- DIODE ZENER 2.4V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,857
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMSZ4681T1G from onsemi is a 2.4 V nominal Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 2 V reverse leakage current (IR) at 1 V VR, and ±5% voltage tolerance. It provides precision low-voltage reference and overvoltage clamping in space-constrained power management circuits.
For engineers reviewing the SZMMSZ4681T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at low IZT, thermal derating behavior on FR-5 board, cathode/anode polarity marking, and AEC-Q101 qualification for automotive subsystems.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable reverse-biased voltage regulation. Its 2.4 V nominal Zener voltage falls in the low-voltage range where temperature coefficient is negative (≈ −3 mV/°C), and dynamic impedance (ZZT) is typically ≤ 100 Ω at 1 mA.
The SOD−123 package supports automated placement and reflow soldering up to 260°C for 10 seconds. With junction-to-ambient thermal resistance of 340°C/W and ESD rating >16 kV (HBM), it meets robustness requirements for industrial and automotive PCB environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.28 V min / 2.4 V nom / 2.52 V max @ IZT = 50 µA - defines tight 5% tolerance band for low-voltage reference stability |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous power handling on standard FR-5 PCB with thermal derating above 75°C |
| Reverse Leakage (IR) | ≤ 2 µA @ VR = 1 V - ensures minimal quiescent current draw in standby or battery-backed circuits |
| Dynamic Impedance (ZZT) | Typ. ≤ 100 Ω @ IZ = 1 mA - determines output voltage variation under small-signal load transients |
| Temperature Range | −55°C to +150°C - enables operation in under-hood automotive and industrial control environments |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and assembly without external protection |
Pinout & Package
SOD−123 surface-mount package: 2-pin, cathode marked by band, dimensions 1.60 × 2.69 × 1.16 mm, void-free thermosetting plastic case, UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential rail; completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including body electronics and infotainment power rails |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements without lead-based solder compatibility compromises |
| Low IZT Operation | Stable regulation at only 50 µA test current-enables ultra-low-power sensing and reference designs |
| High ESD Robustness | Withstands >16 kV human-body-model discharge-reduces need for external TVS protection |
| Optimized SMT Footprint | SOD−123 package supports high-density layout and automated assembly with industry-standard land pattern |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for analog-to-digital conversion of HVAC sensor outputs in vehicle cabin control units. IC Role / Device Role / Timing Role: Provides stable 2.4 V reference for ADC input scaling and biasing op-amps in signal chain. Use Value: Tight 5% VZ tolerance and low IR minimize offset error across −40°C to +125°C operating range. |
Use Scenario: Overvoltage clamp protecting 3.3 V microcontroller I/O pins from transient coupling in factory automation sensors. IC Role / Device Role / Timing Role: Acts as shunt protector limiting voltage excursion to ≤2.52 V during ESD or inductive kick events. Use Value: 16 kV HBM ESD rating and fast Zener turn-on ensure reliable clamping without additional protection components. |
| Portable Medical Device Power Rail | Consumer IoT Battery Monitoring |
Use Scenario: Low-power voltage reference for battery voltage monitoring circuitry in handheld diagnostic tools. IC Role / Device Role / Timing Role: Supplies precision reference to comparator or ADC measuring Li-ion cell voltage during sleep mode. Use Value: 50 µA IZT enables regulation with <2 µA total quiescent current, extending battery life in multi-year deployments. |
Use Scenario: Zener-based voltage supervisor triggering reset when coin-cell voltage drops below 2.4 V threshold. IC Role / Device Role / Timing Role: Functions as programmable undervoltage detection element in ultra-small footprint wearable devices. Use Value: SOD−123 size (1.6 × 2.7 mm) fits within 3 mm² board area constraints while maintaining ±5% trip-point accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4681T1G | No automotive qualification; same electrical specs and SOD−123 package | Not suitable for AEC-Q101–mandated automotive systems | Select when cost sensitivity outweighs automotive compliance requirements |
| BZX84-C2V4LT1G | Higher ZZT (typ. 120 Ω), wider VZ tolerance (±6%), same 2.4 V nominal, SOT-23 package | Larger footprint and lower regulation precision limit use in high-accuracy references | Choose only if SOT-23 board real estate or legacy design reuse is prioritized over voltage stability |
Compared with SZMMSZ4681T1G, MMSZ4681T1G offers identical regulation performance but lacks PPAP capability and automotive traceability, while BZX84-C2V4LT1G trades precision and package size for broader commercial availability-making SZMMSZ4681T1G optimal for automotive-grade, space-constrained, low-IQ reference designs.
Availability
SZMMSZ4681T1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical instrumentation, and consumer IoT battery supervision requiring stable component supply and AEC-Q101 assurance.
Supply support for SZMMSZ4681T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ4xxxT1G/SZMMSZ4xxxT1G series was designed specifically for compact, high-reliability voltage regulation and clamping in automotive and industrial surface-mount systems where low IZT, AEC-Q101 compliance, and SOD−123 scalability are critical.
FAQ
What is the Zener voltage tolerance of SZMMSZ4681T1G?
The SZMMSZ4681T1G has a nominal Zener voltage of 2.4 V with minimum 2.28 V and maximum 2.52 V values at IZT = 50 µA, resulting in a ±5% tolerance band. This tight tolerance is maintained across the full operating temperature range of −55°C to +150°C and supports precision reference applications without external trimming. The SZMMSZ4681T1G datasheet specifies these limits under standard test conditions at TA = 25°C.
Is SZMMSZ4681T1G suitable for automotive applications?
Yes, SZMMSZ4681T1G is AEC-Q101 qualified and PPAP capable, with manufacturing traceability and process controls aligned to automotive quality standards. Its SOD−123 package, −55°C to +150°C operating range, and 16 kV HBM ESD rating make it appropriate for under-hood and cabin electronics. The "SZ" prefix explicitly denotes automotive-grade version of the MMSZ4681T1G base part.
What is the maximum power dissipation for SZMMSZ4681T1G on a standard PCB?
SZMMSZ4681T1G is rated for 500 mW total power dissipation on FR-5 board at lead temperature (TL) of 75°C. Above 75°C, it derates linearly at 6.7 mW/°C. Junction-to-ambient thermal resistance is 340°C/W, meaning ambient temperature rise must be carefully managed in enclosed or high-power-density layouts to avoid exceeding TJ(max) = +150°C.
How is polarity identified on the SZMMSZ4681T1G package?
SZMMSZ4681T1G uses standard SOD−123 polarity marking: the cathode is indicated by a visible band at one end of the package, corresponding to Pin 1 in the mechanical outline. The anode is the opposite, unbanded end (Pin 2). This marking is consistent across all MMSZ4xxxT1G and SZMMSZ4xxxT1G devices and aligns with JEDEC SOD−123 footprint conventions.
Does SZMMSZ4681T1G require external current-limiting resistors in typical applications?
Yes, SZMMSZ4681T1G requires a series current-limiting resistor to establish the desired Zener bias current (IZ) between IZT = 50 µA and the maximum allowable current defined by PD and thermal limits. For example, when regulating from a 5 V supply to 2.4 V, a 51 kΩ resistor delivers ~51 µA-within the optimal regulation zone while keeping power well below 500 mW. The SZMMSZ4681T1G functions only when reverse-biased with controlled current.
SZMMSZ4681T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 2 µA @ 1 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
SZMMSZ4681T1G FAQ
1.How can I place an order for SZMMSZ4681T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ4681T1G 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 SZMMSZ4681T1G reliable?
The price and inventory of SZMMSZ4681T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ4681T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ4681T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ4681T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ4681T1G?
SZMMSZ4681T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ4681T1G 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 SZMMSZ4681T1G?
For technical support, including SZMMSZ4681T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ4681T1G requirements.
6.How does Aetrix verify that SZMMSZ4681T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ4681T1G 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 SZMMSZ4681T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ4681T1G?
All SZMMSZ4681T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ4681T1G, 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 SZMMSZ4681T1G part is unused and in its original packaging.
Return procedure for SZMMSZ4681T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMSZ4681T1G 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…
