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onsemi MMSZ5234B
- Part No.:
- MMSZ5234B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5234B.pdf
- Description:
- DIODE ZENER 6.2V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,198
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Product details
Overview
MMSZ5234B from ON Semiconductor (formerly Fairchild) is a 6.2 V, 500 mW surface-mount Zener diode in SOD-123 package, with 5% tolerance, 7.0 Ω dynamic impedance at 20 mA, and 4.0 µA reverse leakage at 5.0 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5234B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal limits, SOD-123 terminal mapping, and validated alternative parts for voltage reference design, ESD protection clamping, and power rail stabilization.
Technical Context
The MMSZ5234B operates as a silicon planar Zener diode optimized for stable reverse-breakdown behavior at 6.2 V nominal, with tight 5% tolerance and low dynamic impedance (7.0 Ω @ 20 mA) ensuring minimal voltage deviation under load variation. Its 500 mW power rating and 340°C/W junction-to-ambient thermal resistance define safe continuous operation up to +150°C junction temperature.
It exhibits 4.0 µA maximum reverse leakage at VR = 5.0 V and forward voltage ≤0.9 V @ 10 mA, supporting bidirectional signal conditioning and dual-role use in clamp/reference topologies. The SOD-123 package enables high-density PCB layout while maintaining thermal performance on FR-4 substrates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V nominal, min 5.89 V / max 6.51 V - defines precise clamping threshold for 5 V–6 V rail monitoring |
| Power Dissipation (PD) | 500 mW @ TA = 25°C - sets maximum continuous DC or pulsed power handling without derating |
| Zener Impedance (ZZ) | 7.0 Ω @ IZ = 20 mA - ensures <±30 mV output shift across 5–20 mA current range |
| Reverse Leakage (IR) | 4.0 µA @ VR = 5.0 V - guarantees negligible quiescent current draw in standby reference circuits |
| Forward Voltage (VF) | ≤0.9 V @ IF = 10 mA - enables reliable anode-cathode conduction for bidirectional protection paths |
| Tolerance | ±5% - supports industrial-grade voltage accuracy without trimming components |
| Package | SOD-123 - 2-pin surface-mount outline with 2.7 × 1.6 mm footprint and gull-wing leads |
Pinout & Package
SOD-123 package: 2-terminal surface-mount device with cathode band marking; standard JEDEC MO-202AA outline, 2.7 mm length × 1.6 mm width × 1.1 mm height, 0.9 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference polarity for reverse-bias operation |
| Cathode (K) | Zener breakdown terminal / voltage clamp input | Connected to regulated node or signal line; conducts when voltage exceeds 6.2 V, shunting excess current |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage with ±5% tolerance | Enables direct replacement of legacy 6.2 V references without calibration in consumer power supplies |
| Low dynamic impedance (7.0 Ω) | Maintains <±25 mV regulation error across 10–25 mA load current swings in feedback networks |
| Guaranteed 500 mW power rating | Supports sustained 80 mA Zener current at 6.2 V in compact space-constrained designs |
| Low reverse leakage (4.0 µA @ 5 V) | Minimizes bias current error in high-impedance op-amp reference dividers and sensor excitation circuits |
| SOD-123 footprint compatibility | Allows drop-in replacement of MMSZ52xxB series parts on existing 0805-equivalent land patterns |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 6.2 V reference for linear regulator feedback or ADC reference buffer. IC Role / Device Role / Timing Role: Precision voltage reference element in analog signal chain. Use Value: Delivers ±5% accuracy and 7.0 Ω impedance to hold reference within ±30 mV over 5–20 mA sourcing range. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 5 V rail. IC Role / Device Role / Timing Role: Bidirectional ESD/overvoltage clamp diode. Use Value: Clamps to 6.2 V with 4.0 µA leakage at 5 V, minimizing false triggering while absorbing >100 mA surge pulses. |
| Current Source Bias | Temperature-Stable Sensor Excitation |
Use Scenario: Generating constant current for LED bias or photodiode transimpedance amplifier. IC Role / Device Role / Timing Role: Voltage-controlled current source element via series resistor. Use Value: Maintains 6.2 V across resistor with <±0.5% drift from 25°C to 85°C per typical curve data. |
Use Scenario: Supplying excitation voltage to RTD or thermistor bridges requiring low-drift bias. IC Role / Device Role / Timing Role: Low-noise, low-leakage voltage source for bridge arms. Use Value: 4.0 µA leakage at 5 V prevents >0.1% measurement error in 10 kΩ bridge configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C6V2 | 6.2 V ±5%, 300 mW, SOD-523 package, 15 Ω ZZ @ 5 mA | Lower power rating and higher impedance limit use to low-current (<5 mA) references | Select when board space is critical and 300 mW suffices; verify thermal margin at 6.2 V × IZ |
| 1N4735A | 6.2 V ±5%, 1 W, DO-41 through-hole, 5 Ω ZZ @ 41 mA | Higher power and lower impedance suit high-current regulation but require through-hole assembly | Choose for prototyping or high-reliability through-hole systems where 1 W dissipation is needed |
Compared with BZX584C6V2 and 1N4735A, the MMSZ5234B offers optimal balance of SMD compatibility, 500 mW capability, and 7.0 Ω impedance-making it ideal for production-grade 6.2 V reference in space-constrained, medium-current applications without through-hole constraints.
Availability
MMSZ5234B is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and current source bias applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for MMSZ5234B 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.
The MMSZ5234B belongs to the MMSZ52xxB Zener diode family designed for precision voltage regulation and clamping in compact, high-reliability surface-mount applications across consumer, industrial, and computing systems.
FAQ
What is the nominal Zener voltage of the MMSZ5234B?
The MMSZ5234B has a nominal Zener voltage of 6.2 V, with a guaranteed range of 5.89 V (minimum) to 6.51 V (maximum) at 20 mA test current and 25°C ambient temperature. This value is specified in the official ON Semiconductor datasheet Rev. E and applies directly to the MMSZ5234B device under standard test conditions.
What is the maximum power dissipation rating for the MMSZ5234B?
The MMSZ5234B is rated for 500 mW maximum power dissipation at 25°C ambient temperature. Derating is required above 25°C at 1.47 mW/°C based on its 340°C/W junction-to-ambient thermal resistance. This rating is defined in the Absolute Maximum Ratings table of the MMSZ5234B datasheet and governs safe continuous operation.
Does the MMSZ5234B have a specified forward voltage?
Yes, the MMSZ5234B has a maximum forward voltage of 0.9 V at 10 mA forward current, as stated in the "VF Forward Voltage" note of the MMSZ5226B–MMSZ5257B datasheet. This parameter applies uniformly across the entire series, including the MMSZ5234B, and supports bidirectional circuit use such as ESD clamping.
What is the reverse leakage current specification for the MMSZ5234B?
The MMSZ5234B specifies a maximum reverse leakage current of 4.0 µA at 5.0 V reverse voltage and 25°C. This value is explicitly listed in the Electrical Characteristics table for the MMSZ5234B row and reflects its performance as a low-leakage voltage reference in high-impedance analog circuits.
Which package type does the MMSZ5234B use?
The MMSZ5234B uses the SOD-123 surface-mount package, confirmed by the "SOD-123" notation in the Absolute Maximum Ratings section and mechanical drawings in the MMSZ5226B–MMSZ5257B datasheet. It features a 2.7 mm × 1.6 mm body with gull-wing leads and is compatible with standard SMT reflow profiles.
MMSZ5234B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 4 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
MMSZ5234B FAQ
1.How can I place an order for MMSZ5234B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5234B 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 MMSZ5234B reliable?
The price and inventory of MMSZ5234B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5234B is usually 5 days.
3.What payment methods are accepted for MMSZ5234B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5234B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5234B?
MMSZ5234B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5234B 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 MMSZ5234B?
For technical support, including MMSZ5234B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5234B requirements.
6.How does Aetrix verify that MMSZ5234B is sourced from the original manufacturer or authorized distributors?
All MMSZ5234B 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 MMSZ5234B meets industry standards.
7.What is the process for return or replacement of MMSZ5234B?
All MMSZ5234B units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5234B, 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 MMSZ5234B part is unused and in its original packaging.
Return procedure for MMSZ5234B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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