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Diodes Incorporated MMSZ5257BQ-7-F
- Part No.:
- MMSZ5257BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5257BQ-7-F.pdf
- Description:
- DIODE ZENER 33V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,990
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Product details
Overview
MMSZ5257BQ-7-F from Diodes Incorporated is an automotive-grade 33 V, 3.8 mA nominal Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 700 Ω maximum Zener impedance at IZK = 0.25 mA and 0.1 µA reverse leakage at VR = 25 V - used for precision voltage reference and overvoltage protection in automotive body control modules.
For engineers reviewing the MMSZ5257BQ-7-F datasheet, MMSZ5257BQ-7-F pinout, MMSZ5257BQ-7-F application, or MMSZ5257BQ-7-F equivalent, key selection criteria include Zener voltage tolerance (±3.5%), thermal resistance (338 °C/W), AEC-Q101 qualification, SOD123 footprint compatibility, and low leakage under bias conditions.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable 33 V regulation across a 3.8 mA test current, with temperature coefficient of +0.09 %/°C typical - enabling predictable drift compensation in automotive ambient ranges. Its 700 Ω dynamic impedance at knee current ensures minimal voltage variation under load transients.
The device uses alloy 42 leadframe with matte tin plating, meets J-STD-020 moisture sensitivity Level 1, and features cathode band polarity marking. It is qualified per AEC-Q101 Rev. D for high-reliability automotive use, with operating junction temperature spanning −65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 31.35–34.65 V range at IZT = 3.8 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation | 370 mW at TA = +25°C - sets maximum continuous DC power in free-air PCB layout |
| Zener Impedance | 700 Ω max at IZK = 0.25 mA - determines small-signal AC regulation stiffness near knee region |
| Reverse Leakage | 0.1 µA max at VR = 25 V - ensures minimal standby current in voltage-clamp circuits |
| Thermal Resistance | 338 °C/W (Junction-to-Ambient) - governs temperature rise on FR-4 board with 1-inch copper pad |
| Operating Temp | −65 °C to +150 °C - supports engine bay and under-hood deployment without derating |
Pinout & Package
Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g; UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to higher-potential rail; clamps voltage to 33 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per Rev. D - enables use in safety-critical BCU and lighting control units |
| Green compound molding | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - satisfies EU ELV and OEM chemical compliance requirements |
| SOD123 footprint | Standardized 2-pin SMT outline compatible with automated pick-and-place and reflow processes - reduces assembly cost and defect rate |
| Low leakage at 25 V | ≤0.1 µA reverse current - minimizes quiescent power loss in always-on battery monitoring circuits |
Applications
| Automotive Body Control Unit (BCU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 33 V reference for microcontroller ADC inputs in door module ECUs exposed to 12 V/24 V battery fluctuations. IC Role / Device Role / Timing Role: Precision voltage reference and transient suppression element in analog front-end supply chain. Use Value: Maintains ±3.5% VZ stability across −40 °C to +125 °C ambient, reducing calibration drift in factory-programmed thresholds. |
Use Scenario: Clamping 33 V rail in 4–20 mA loop-powered pressure transmitters operating in hazardous zones. IC Role / Device Role / Timing Role: Overvoltage protector and stable bias source for op-amp gain stages. Use Value: 700 Ω Zener impedance limits output perturbation during ESD events, preserving signal integrity below 1 LSB error. |
| Automotive LED Headlamp Driver | Medical Diagnostic Power Sequencing |
Use Scenario: Providing stable 33 V bias for high-side current sense amplifiers in adaptive driving beam controllers. IC Role / Device Role / Timing Role: Reference voltage generator and fault-detection clamp in PWM-controlled buck-boost stage. Use Value: AEC-Q101 qualification ensures uninterrupted operation during cold-crank (4.5 V) and load-dump (40 V) transients. |
Use Scenario: Generating isolated 33 V auxiliary supply for FPGA configuration memory in portable ultrasound imaging systems. IC Role / Device Role / Timing Role: Low-leakage voltage reference for power-on reset sequencing logic. Use Value: 0.1 µA IR at 25 V prevents premature discharge of hold-up capacitors during standby intervals >72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C33 | 33 V ±5%, 500 mW, SOD-323 package, 1000 Ω ZZT - smaller footprint but higher impedance and no AEC-Q101 rating | Limited to commercial-grade consumer power supplies; unsuitable for under-hood automotive use | Select only if space-constrained PCB layout outweighs reliability and thermal performance requirements |
| MMSZ5257B-7-F | Identical electrical specs, same SOD123 package, but commercial-grade (non-AEC-Q101) qualification | Acceptable for industrial control panels but excluded from OEM automotive BOMs requiring PPAP documentation | Choose when cost sensitivity dominates and automotive qualification is not mandated by system-level safety analysis |
Compared with BZX584-C33 and MMSZ5257B-7-F, MMSZ5257BQ-7-F uniquely delivers AEC-Q101 validation, tighter 3.5% VZ tolerance, and guaranteed 0.1 µA leakage at 25 V - making it the sole option for ASIL-B compliant voltage supervision in automotive power domains.
Availability
MMSZ5257BQ-7-F is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor transmitters, and medical diagnostic power sequencers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5257BQ-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The MMSZ52xxB series targets automotive and industrial Zener regulation needs - engineered for high-reliability voltage reference, overvoltage clamping, and biasing in harsh environments with extended temperature and chemical compliance requirements.
FAQ
What is the Zener voltage tolerance for MMSZ5257BQ-7-F at 3.8 mA?
The Zener voltage tolerance is ±3.5% - specified as 31.35 V minimum and 34.65 V maximum at IZT = 3.8 mA and TA = +25°C. This tolerance remains valid across the full operating temperature range of −65 °C to +150 °C, with typical temperature coefficient of +0.09 %/°C.
Is MMSZ5257BQ-7-F RoHS and REACH compliant?
Yes - it is fully RoHS 2 (2011/65/EU) compliant with no purposely added lead, and meets REACH SVHC requirements. The device uses halogen- and antimony-free green molding compound (<900 ppm Br/Cl, <1000 ppm Sb), certified per Diodes Incorporated's Green Policy v3.0.
Can MMSZ5257BQ-7-F replace MMSZ5257B-7-F in automotive designs?
Yes - electrically identical and pin-compatible, but MMSZ5257BQ-7-F adds AEC-Q101 Rev. D qualification, extended temperature testing, and PPAP-ready documentation. It is required for OEM automotive applications where MMSZ5257B-7-F is restricted to commercial use only.
What is the maximum power dissipation at 100 °C ambient temperature?
At TA = +100 °C, derated power dissipation is 220 mW - calculated using the linear derating curve (370 mW at 25 °C, zero at 145 °C), slope = −3.2 mW/°C. This assumes mounting on FR-4 with 1-inch² copper pad per JEDEC standards.
MMSZ5257BQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 58 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5257BQ-7-F FAQ
1.How can I place an order for MMSZ5257BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5257BQ-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 MMSZ5257BQ-7-F reliable?
The price and inventory of MMSZ5257BQ-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 MMSZ5257BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5257BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5257BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5257BQ-7-F?
MMSZ5257BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5257BQ-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 MMSZ5257BQ-7-F?
For technical support, including MMSZ5257BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5257BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5257BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5257BQ-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 MMSZ5257BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5257BQ-7-F?
All MMSZ5257BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5257BQ-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 MMSZ5257BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5257BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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