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onsemi MMSZ4708T1
- Part No.:
- MMSZ4708T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4708T1.pdf
- Description:
- DIODE ZENER 22V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
MMSZ4708T1 from onsemi is a 22 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 0.01 µA leakage at 16.7 V reverse bias, and ESD rating >16 kV (HBM). It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MMSZ4708T1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, dynamic impedance at 20 mA, temperature coefficient near zero-crossing, thermal derating above 75°C, and SOD−123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across variable load currents by conducting excess current to ground when input exceeds VZ. Its 22 V nominal Zener voltage falls within the positive temperature coefficient region (>~5 V), exhibiting +6.7 mV/°C typical TC per Figure 1.
Designed for surface-mount assembly on FR-4/FR-5 boards, it features a void-free thermosetting plastic case rated UL 94 V−0, cathode polarity band marking, and maximum soldering temperature of 260°C for 10 seconds. Junction-to-lead thermal resistance is 150°C/W, enabling reliable operation up to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9–23.1 V @ IZT = 50 µA; defines regulated voltage range under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal design margin |
| Reverse Leakage (IR) | ≤0.01 µA @ VR = 16.7 V; ensures minimal quiescent current in standby protection circuits |
| Dynamic Impedance (ZZT) | ~55 Ω @ IZ = 20 mA (typical curve Fig.5); determines regulation stiffness under dynamic load changes |
| ESD Rating | Class 3 (>16 kV) HBM; supports robust handling in automated manufacturing without external protection |
| Operating Temperature | −55°C to +150°C TJ/Tstg; validated for automotive under-hood and industrial control environments |
Pinout & Package
SOD−123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm body, void-free thermosetting plastic case, cathode indicated by polarity band, RoHS-compliant Pb−free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; conducts current into device when reverse-biased above VZ |
| 2 (Non-banded End) | Anode | Connected to circuit ground or common return path; completes shunt regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| Low IZT test current | 50 µA enables accurate VZ measurement with minimal bias circuit loading |
| High ESD immunity | Class 3 (>16 kV HBM) eliminates need for external ESD protection in board-level designs |
| Thermal performance | RJL = 150°C/W allows direct thermal coupling to copper pour for enhanced power handling |
| Automated assembly support | Optimized SOD−123 footprint and corrosion-resistant finish ensure high-yield reflow soldering |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 22 V reference for ADC voltage dividers or op-amp feedback networks in sensor signal conditioning. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC bias point independent of supply variation. Use Value: Tight 5% VZ tolerance and low 0.01 µA IR minimize drift and loading error in high-impedance analog paths. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 22 V in industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Fast-acting crowbar element clamping voltage spikes before damage occurs. Use Value: Sub-µA leakage preserves signal integrity during normal operation while responding within nanoseconds to overvoltage events. |
| Power Supply Regulation | Temperature-Stable Biasing |
Use Scenario: Regulating auxiliary 22 V rail for isolated gate drivers in motor control inverters. IC Role / Device Role / Timing Role: Low-power shunt regulator stabilizing secondary-side bias supply under light-load conditions. Use Value: 500 mW rating and −55°C to +150°C operation support reliable function in thermally demanding power stages. | Use Scenario: Generating temperature-compensated bias for RF amplifier stages requiring stable DC operating points. IC Role / Device Role / Timing Role: Zener diode with +6.7 mV/°C TC used in series/parallel configurations to offset transistor VBE drift. Use Value: Predictable positive TC enables precise cancellation of semiconductor parameter drift across wide ambient ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22 | Same 22 V nominal Zener, but SOT-23 package (larger footprint, higher RJA = 300°C/W) | Less suitable for ultra-high-density layouts; requires larger pad geometry and exhibits greater thermal rise at 500 mW | Select BZX84-C22 only if SOT-23 is already standardized in existing PCB stack-up |
| MMSZ5247B | 22 V Zener in SOD-123, but rated 350 mW PD and higher IR (0.1 µA @ 17.6 V) | Lower power headroom and higher leakage reduce accuracy in precision reference or low-power standby circuits | Prefer MMSZ4708T1 where full 500 mW capability and sub-0.02 µA leakage are required |
Compared with BZX84-C22 and MMSZ5247B, the MMSZ4708T1 delivers superior thermal performance in compact layouts and tighter leakage control-critical for battery-powered sensors and automotive ECUs where quiescent current and board area are constrained.
Availability
MMSZ4708T1 is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and low-power supply regulation requiring stable component supply across automotive, industrial control, and medical instrumentation programs.
Supply support for MMSZ4708T1 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 supplier of energy-efficient semiconductor solutions, serving automotive, industrial, cloud, medical, and IoT markets with differentiated silicon and system-level expertise.
The MMSZ4xxxT1G series targets cost-sensitive, space-constrained applications needing reliable, low-leakage Zener regulation-designed specifically for high-volume automated assembly in automotive modules and industrial edge devices.
FAQ
What is the exact Zener voltage tolerance for MMSZ4708T1?
The MMSZ4708T1 has a guaranteed Zener voltage range of 20.9 V to 23.1 V at IZT = 50 µA and TA = 25°C, corresponding to ±5% tolerance around the nominal 22 V value. This tolerance remains valid across the full operating temperature range of −55°C to +150°C, as confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.
Does MMSZ4708T1 support automotive-grade reliability requirements?
Yes, the MMSZ4708T1 is manufactured to meet AEC−Q101 stress test qualifications and supports PPAP documentation. It features an ESD rating >16 kV (HBM), UL 94 V−0 flammability compliance, and operates reliably from −55°C to +150°C junction temperature-making it suitable for under-hood and chassis-mounted automotive electronics where MMSZ4708T1 is deployed as a clamp or reference element.
What is the maximum allowable reverse voltage before breakdown for MMSZ4708T1?
The MMSZ4708T1 begins regulating at its specified Zener voltage (20.9–23.1 V), but the absolute maximum reverse voltage before irreversible breakdown is not defined separately-it is governed by the device's power limit and thermal constraints. At 22 V, sustained current must remain below ~22.7 mA to stay within 500 mW PD at 75°C; exceeding this risks thermal runaway. The MMSZ4708T1 is not rated for avalanche operation beyond its Zener region.
Can MMSZ4708T1 be used in place of MMSZ4707T1 or MMSZ4709T1?
No-MMSZ4708T1 is not interchangeable with MMSZ4707T1 (20 V nominal) or MMSZ4709T1 (24 V nominal) due to distinct Zener voltage bands. Each part has unique marking (DA vs DV vs DX) and specified VZ ranges that do not overlap. Substituting MMSZ4708T1 for either would shift regulation voltage by ±2 V, potentially violating system-level voltage margin requirements. Always verify target VZ against the exact MMSZ4708T1 specification.
What is the dynamic impedance (ZZT) of MMSZ4708T1 at 20 mA forward current?
The dynamic impedance ZZT of MMSZ4708T1 is approximately 55 Ω at IZ = 20 mA and TJ = 25°C, as inferred from the typical Zener impedance curve in Figure 5 of the datasheet (which plots ZZT vs VZ for the family). This value reflects AC impedance under small-signal conditions and directly impacts regulation stability during load transients-lower ZZT yields tighter voltage control, and MMSZ4708T1's 55 Ω supports moderate-precision applications where MMSZ4708T1 serves as a local reference.
MMSZ4708T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 nA @ 16.7 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
MMSZ4708T1 FAQ
1.How can I place an order for MMSZ4708T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4708T1 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 MMSZ4708T1 reliable?
The price and inventory of MMSZ4708T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4708T1 is usually 5 days.
3.What payment methods are accepted for MMSZ4708T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4708T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4708T1?
MMSZ4708T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4708T1 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 MMSZ4708T1?
For technical support, including MMSZ4708T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4708T1 requirements.
6.How does Aetrix verify that MMSZ4708T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ4708T1 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 MMSZ4708T1 meets industry standards.
7.What is the process for return or replacement of MMSZ4708T1?
All MMSZ4708T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4708T1, 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 MMSZ4708T1 part is unused and in its original packaging.
Return procedure for MMSZ4708T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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