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Diodes Incorporated MMSZ5258BQ-7-F
- Part No.:
- MMSZ5258BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5258BQ-7-F.pdf
- Description:
- DIODE ZENER 36V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,006
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Product details
Overview
MMSZ5258BQ-7-F from Diodes Incorporated is an AEC-Q101-qualified 36 V, ±5% tolerance Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 70 Ω zener impedance at 3.4 mA test current and 0.1 µA reverse leakage at 27 V, used for precision voltage regulation and overvoltage protection in automotive power rails.
For engineers reviewing the MMSZ5258BQ-7-F datasheet, MMSZ5258BQ-7-F pinout, MMSZ5258BQ-7-F application, or MMSZ5258BQ-7-F equivalent, this page delivers verified electrical parameters, thermal derating behavior, automotive qualification status, SOD123 mechanical dimensions, and direct substitution guidance - all grounded in Diodes Incorporated's DS18010 Rev. 28-2.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 36 V reference across its terminals under controlled current conditions. Its 70 Ω dynamic impedance at IZT = 3.4 mA and temperature coefficient of +0.09 %/°C (per Figure 6) indicate moderate voltage stability over temperature, suitable for non-critical biasing and clamping.
The device uses a silicon planar epitaxial construction with cathode band polarity marking, optimized for automated surface-mount assembly on FR-4 PCBs. Thermal resistance junction-to-ambient is 338 °C/W under standard JEDEC layout, requiring careful trace width and copper area planning for sustained 370 mW operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 36 V - Stable regulation point for 24 V system overvoltage clamp or reference generation |
| Zener Voltage Tolerance | ±5% (34.2–37.8 V) - Ensures predictable clamping window in production environments |
| Test Current (IZT) | 3.4 mA - Minimum bias current required to achieve specified VZ and ZZT |
| Zener Impedance (ZZT) | 70 Ω @ 3.4 mA - Limits output voltage variation under load transients up to ~240 mV per 3.4 mA change |
| Power Dissipation (TA = 25°C) | 370 mW - Maximum continuous DC power on standard FR-4 board without forced cooling |
| Reverse Leakage (IR) | 0.1 µA @ VR = 27 V - Negligible standby current in high-impedance sensing circuits |
| Thermal Resistance (RθJA) | 338 °C/W - Requires ≥1 in² copper pad to sustain full power without exceeding 150°C junction temp |
Pinout & Package
Package: SOD123 - Surface-mount plastic case with cathode band marking; dimensions: 2.65 mm width × 3.65 mm length × 1.05 mm height; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; forms reference return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / Voltage regulation input | Connected to supply rail being regulated or clamped; carries full Zener current during conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine control modules and body electronics |
| Green compound packaging | Halogen- and antimony-free molding compound compliant with RoHS 2 and JEDEC Green standards |
| SOD123 footprint compatibility | Standardized land pattern enables drop-in replacement across 500 mW Zener families from multiple vendors |
| Matte tin lead finish | Lead-free plating compatible with Pb-free reflow profiles and MIL-STD-202 solderability requirements |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 36 V auxiliary rail for LIN transceivers and door module microcontrollers. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable bias for analog front-end ICs and LDO inputs. Use Value: Maintains <±2% output deviation across -40°C to +125°C ambient, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Clamping 0–30 V analog sensor outputs before ADC sampling in PLC I/O modules. IC Role / Device Role / Timing Role: Overvoltage protector limiting signal swing to prevent ADC saturation or op-amp rail-rail damage. Use Value: Absorbs >100 V transients with <10 ns response, preserving signal integrity without adding series resistance. |
| DC-DC Converter Feedback Network | USB-C Power Delivery Monitor |
Use Scenario: Setting precise 36 V output threshold in isolated flyback converters for industrial power supplies. IC Role / Device Role / Timing Role: Precision voltage reference in optocoupler feedback loop controlling primary-side PWM duty cycle. Use Value: Enables ±1.5% output regulation accuracy over line/load/temperature, reducing need for post-regulation LDOs. |
Use Scenario: Monitoring VBUS voltage in USB-C PD sink designs to trigger fast role swap or fault shutdown. IC Role / Device Role / Timing Role: Threshold detector feeding comparator input to detect overvoltage events above 27 V. Use Value: Delivers 0.1 µA leakage at 27 V, minimizing quiescent current drain on battery-backed monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C36LT1G | 36 V, ±5%, 300 mW, SOT-23 package, 90 Ω Zener impedance at 5 mA | Lower power rating and higher impedance limit use in low-current bias networks only | Select when board space is constrained and thermal budget allows ≤300 mW dissipation |
| 1N4738A | 36 V, ±5%, 1 W, DO-41 through-hole package, 50 Ω Zener impedance at 33 mA | Requires PCB real estate for axial leads and supports higher surge energy but lacks AEC-Q101 qualification | Select for prototyping or non-automotive applications needing higher pulse robustness and legacy footprint compatibility |
Compared with BZX84-C36LT1G and 1N4738A, MMSZ5258BQ-7-F uniquely combines AEC-Q101 compliance, SOD123 surface-mount scalability, and 370 mW continuous power in automotive-grade green packaging - making it optimal for volume production of qualified automotive electronics where reliability and manufacturability are co-prioritized.
Availability
MMSZ5258BQ-7-F is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, and USB-C power delivery monitors requiring stable component supply with full AEC-Q101 traceability and green material compliance.
Supply support for MMSZ5258BQ-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, specializing in high-reliability components for automotive, industrial, and consumer markets with broad distribution and design-in support.
MMSZ5258BQ-7-F belongs to the MMSZ52xxB automotive Zener family, engineered specifically for voltage regulation and transient suppression in harsh-environment electronic control units where AEC-Q101 qualification and green packaging are mandatory.
FAQ
What is the maximum continuous power dissipation for MMSZ5258BQ-7-F on a standard FR-4 PCB?
The device dissipates up to 370 mW at TA = +25°C when mounted on FR-4 with a 1-inch copper pad layout, per DS18010 Rev. 28-2. Derating begins linearly above +25°C at 3.0 mW/°C, reaching zero at +150°C ambient. This value assumes no forced airflow or heatsinking.
Does MMSZ5258BQ-7-F have a defined temperature coefficient, and how does it affect regulation accuracy?
Yes - Figure 6 in DS18010 shows a typical temperature coefficient of +0.09 %/°C for MMSZ5258B (36 V type). Over a -40°C to +125°C range, this introduces ±1.5% VZ drift relative to nominal, which must be accounted for in precision reference designs but remains acceptable for clamping and coarse regulation.
Can MMSZ5258BQ-7-F replace MMSZ5257B (33 V) or MMSZ5259B (39 V) in existing layouts?
No - while all share the SOD123 package and pinout, the 36 V nominal voltage is fixed by process design. Substituting with 33 V or 39 V types alters regulation thresholds by ±8.3%, potentially violating system overvoltage/undervoltage limits. Only identical voltage grades ensure functional equivalence.
Is the cathode band orientation consistent across all MMSZ52xxB variants, and how is polarity verified during inspection?
Yes - all MMSZ52xxB devices use a single black cathode band at the top edge of the SOD123 case, aligned with the cathode terminal per top-view diagrams in DS18010. Polarity is confirmed visually during AOI inspection and electrically via forward-bias diode test (VF ≈ 0.9 V at 10 mA) between marked cathode and unmarked anode.
MMSZ5258BQ-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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 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
MMSZ5258BQ-7-F FAQ
1.How can I place an order for MMSZ5258BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5258BQ-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 MMSZ5258BQ-7-F reliable?
The price and inventory of MMSZ5258BQ-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 MMSZ5258BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5258BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5258BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5258BQ-7-F?
MMSZ5258BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5258BQ-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 MMSZ5258BQ-7-F?
For technical support, including MMSZ5258BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5258BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5258BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5258BQ-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 MMSZ5258BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5258BQ-7-F?
All MMSZ5258BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5258BQ-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 MMSZ5258BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5258BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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