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Diodes Incorporated MMSZ5255BS-7-F
- Part No.:
- MMSZ5255BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5255BS-7-F.pdf
- Description:
- DIODE ZENER 28V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,794
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Product details
Overview
MMSZ5255BS-7-F from Diodes Incorporated is a surface-mount silicon Zener diode with a nominal zener voltage of 28 V, ±5% tolerance (26.6–29.4 V), 200 mW power dissipation, 44 Ω zener impedance at 4.5 mA test current, and 0.1 µA reverse leakage at 21 V. It is housed in an SOD-323 package and used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5255BS-7-F datasheet, MMSZ5255BS-7-F pinout, MMSZ5255BS-7-F application, or MMSZ5255BS-7-F equivalent, key selection criteria include zener voltage accuracy, thermal resistance (625 °C/W), low leakage at rated VR, SOD-323 footprint compatibility, and RoHS/Green compliance for automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent voltage regulation, while the SOD-323 package enables high-density placement and reflow compatibility.
It delivers 28 V regulation at IZT = 4.5 mA with 44 Ω dynamic impedance, supporting stable biasing in sensor signal conditioning and voltage monitoring circuits. Thermal derating begins above +25°C ambient per Figure 1, with full 200 mW dissipation only at TA ≤ +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28 V nominal, 26.6–29.4 V range at 4.5 mA - defines regulated output level in reference circuits |
| Power Dissipation (PD) | 200 mW at TA = +25°C - limits continuous current to ~7.1 mA at 28 V |
| Zener Impedance (ZZT) | 44 Ω at IZT = 4.5 mA - determines regulation stiffness under load transients |
| Reverse Leakage (IR) | 0.1 µA max at VR = 21 V - ensures minimal error current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 625 °C/W - requires careful PCB copper area planning to avoid junction overheating |
| Package | SOD-323 - 1.2–1.4 mm width, 2.3–2.7 mm length, 0.25–0.35 mm thickness - compatible with 0805 land patterns |
Pinout & Package
The MMSZ5255BS-7-F is a two-terminal device in the SOD-323 surface-mount package. The cathode is marked by a band on the top surface; the anode is unmarked. No internal circuitry or control logic is present - operation relies solely on reverse-biased PN junction characteristics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side of regulated circuit; establishes reference ground reference point |
| Cathode | Zener voltage output terminal / Reverse breakdown anode | Marked with band; connected to higher-potential side; provides stable 28 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ tolerance and long-term stability under thermal cycling |
| SOD-323 package | Enables 0.65 mm pitch placement and compatibility with standard 0805 reflow profiles |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU with <900 ppm Br/Cl and <1000 ppm Sb - suitable for consumer and industrial PCBs |
| Low reverse leakage | 0.1 µA at 21 V supports high-impedance voltage divider and sensor bias networks without loading error |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure sensors operating from 24 V rails. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 28 V bias to op-amp input stage and bridge excitation. Use Value: Maintains ±0.5% output linearity across -40°C to +85°C due to low tempco and 44 Ω ZZT. |
Use Scenario: Generating precise 28 V auxiliary rail for USB PD sink controller logic and gate drivers. IC Role / Device Role / Timing Role: Standalone shunt regulator supplying clean 28 V to MCU and level-shifters in multi-rail PD designs. Use Value: Eliminates need for LDO in low-current auxiliary path, reducing BOM count and board space. |
| Automotive Body Control Module (BCM) Monitoring | IoT Edge Node Battery Protection |
Use Scenario: Overvoltage detection on 24 V CAN bus power lines in BCM submodules. IC Role / Device Role / Timing Role: Clamping diode protecting downstream 3.3 V regulators from transient spikes up to 39 V. Use Value: Withstands 0.1 µA leakage at 21 V, avoiding false triggers during normal 24 V operation. |
Use Scenario: Monitoring Li-ion battery pack voltage (8S configuration ≈ 28 V nominal) in smart battery gauges. IC Role / Device Role / Timing Role: Precision voltage reference for ADC input scaling in fuel gauge ICs. Use Value: 26.6–29.4 V tolerance matches 8S Li-ion pack variation, enabling single-point calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C27LT1G | 27 V nominal, ±5%, 200 mW, SOD-323, 50 Ω ZZT @ 5 mA | Lower voltage; higher ZZT reduces regulation precision at light loads | Select when 27 V suffices and tighter VZ matching to adjacent components is required |
| MMBZ5255BLT1G | 28 V nominal, ±5%, 350 mW, SOT-23, 44 Ω ZZT @ 4.5 mA | Higher PD but larger SOT-23 footprint; same VZ and ZZT | Choose when >200 mW dissipation is needed and board space allows SOT-23 |
Compared with BZX584C27LT1G and MMBZ5255BLT1G, the MMSZ5255BS-7-F uniquely balances 28 V regulation, 44 Ω impedance, and SOD-323 miniaturization - making it optimal for space-constrained 28 V reference nodes where 200 mW is sufficient.
Availability
MMSZ5255BS-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, automotive body control module monitoring, and IoT edge node battery protection requiring stable component supply and full RoHS/Green compliance.
Supply support for MMSZ5255BS-7-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation in consumer, industrial, and automotive applications with strict environmental compliance requirements.
FAQ
What is the maximum reverse voltage (VR) this Zener can withstand without breakdown?
The MMSZ5255BS-7-F exhibits 0.1 µA reverse leakage at VR = 21 V, meaning it remains in non-breakdown mode up to that voltage. Breakdown begins near its nominal 28 V zener voltage; operation below 21 V ensures negligible conduction and no regulation.
Can this device be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging when paralleled. For >200 mW, use a single higher-power Zener (e.g., 1N4749A) or active regulation instead.
Is the SOD-323 package compatible with standard 0805 solder paste stencils?
Yes - the SOD-323 outline (1.2–1.4 mm width × 2.3–2.7 mm length) aligns with IPC-7351B 0805 land pattern recommendations. Recommended pad layout is documented in Diodes AP02001, supporting reliable reflow yield.
Does this part meet AEC-Q200 stress testing requirements for automotive use?
No - the MMSZ5255BS-7-F is not AEC-Q200 qualified. For automotive applications, Diodes offers the AZ-series (e.g., AZMMSZ5255BS) with extended temperature screening and qualification testing per AEC-Q200 Rev D.
MMSZ5255BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
MMSZ5255BS-7-F FAQ
1.How can I place an order for MMSZ5255BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5255BS-7-F 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 MMSZ5255BS-7-F reliable?
The price and inventory of MMSZ5255BS-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5255BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5255BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5255BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5255BS-7-F?
MMSZ5255BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5255BS-7-F 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 MMSZ5255BS-7-F?
For technical support, including MMSZ5255BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5255BS-7-F requirements.
6.How does Aetrix verify that MMSZ5255BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5255BS-7-F 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 MMSZ5255BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5255BS-7-F?
All MMSZ5255BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5255BS-7-F, 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 MMSZ5255BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5255BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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