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Diodes Incorporated ZMM5243B-7
- Part No.:
- ZMM5243B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5243B-7.pdf
- Description:
- DIODE ZENER 13V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,858
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Product details
Overview
ZMM5243B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 13 V (12.35–13.65 V range), 9.5 mA test current, and 13 Ω dynamic impedance at IZT. It features a MiniMELF glass package, -65°C to +175°C operating temperature range, and ±0.079 %/°C temperature coefficient - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the ZMM5243B-7 datasheet, ZMM5243B-7 pinout, ZMM5243B-7 application, or ZMM5243B-7 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at 9.5 mA, thermal resistance (300 °C/W), reverse leakage (<0.5 µA at 9.9 V), and MiniMELF mechanical compatibility in space-constrained PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when biased above its specified VZ threshold. Its zener action is optimized for stable regulation at IZT = 9.5 mA, with low dynamic impedance (13 Ω) ensuring minimal output variation under load transients.
The MiniMELF hermetic glass package provides robust thermal performance (RJA = 300 °C/W) and high reliability across industrial temperature extremes. Its cathode band polarity marking and MIL-STD-202 solderable terminals support automated assembly and long-term stability in unregulated DC rails and analog sensor biasing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal, 12.35–13.65 V min/max - defines precise clamping level for 12 V system protection |
| Test Current (IZT) | 9.5 mA - operating point where VZ and ZZT are guaranteed per spec |
| Zener Impedance (ZZT) | 13 Ω at IZT - ensures <130 mV output shift for ±1 mA load change |
| Max Reverse Current (IR) | 0.5 µA at 9.9 V - confirms sharp knee and low leakage below regulation threshold |
| Power Dissipation (PD) | 500 mW - sets maximum continuous DC power handling at ambient temperature |
| Temp Coefficient (TC) | +0.079 %/°C - enables predictable VZ drift compensation in wide-temp designs |
| Thermal Resistance (RJA) | 300 °C/W - determines junction rise above ambient under full power |
Pinout & Package
Two-terminal device in MiniMELF (JEDEC DO-213AA) hermetic glass package: cylindrical body with cathode band marking; anode and cathode terminals are axial leads suitable for reflow or wave soldering per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to lower-potential side in shunt regulator configuration; establishes return path for IZ |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to input rail; maintains stable 13 V relative to anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| MiniMELF hermetic glass construction | Enables operation from -65°C to +175°C with no moisture-induced parameter shift |
| Low dynamic impedance (13 Ω) | Minimizes output voltage deviation during transient load steps in feedback networks |
| Tight VZ tolerance (±5% at 13 V) | Reduces need for post-assembly trimming in precision 12 V rail monitors |
| Cathode band polarity marking | Ensures correct orientation during automated optical inspection and pick-and-place |
| MIL-STD-202 solderable terminals | Supports repeatable, void-free reflow profiles without lead corrosion or dewetting |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Biasing |
|---|---|
Use Scenario: Shunt regulation in isolated flyback auxiliary winding feedback circuit. IC Role / Device Role / Timing Role: Voltage reference element setting TL431 or optocoupler LED current threshold. Use Value: 13 V nominal VZ matches common 12 V system margin; ±5% tolerance avoids false trip in brown-out detection. | Use Scenario: Stable bias voltage source for analog pressure or temperature sensors in engine control units. IC Role / Device Role / Timing Role: Precision reference for ratiometric ADC excitation or op-amp offset nulling. Use Value: +0.079 %/°C TC aligns with silicon sensor drift, minimizing system-level calibration burden across -40°C to +125°C. |
| LED Current Limit Protection | Programmable Threshold Detector |
Use Scenario: Overvoltage clamp protecting constant-current LED driver IC inputs. IC Role / Device Role / Timing Role: Fail-safe shunt element diverting excess voltage before IC damage threshold. Use Value: 500 mW PD sustains short-duration surges; 0.5 µA IR at 9.9 V prevents false triggering during normal operation. | Use Scenario: Input threshold element in comparator-based battery undervoltage lockout (UVLO). IC Role / Device Role / Timing Role: Reference node defining 13 V trip point for Li-ion pack monitoring. Use Value: Low ZZT (13 Ω) ensures sharp transition edge; MiniMELF size fits compact battery management PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C13 (Vishay) | Same 13 V nominal, but 500 mW in DO-35 package; higher RJA (500 °C/W); ±5% tolerance | Less thermally efficient in high-density layouts; requires larger PCB footprint | Prefer ZMM5243B-7 for MiniMELF space constraints and superior thermal resistance |
| 1N4742A (ON Semiconductor) | 12 V nominal (not 13 V); 1 W power rating in DO-41; ZZT = 9 Ω at 21 mA | Higher power but mismatched voltage; unsuitable for 13 V reference designs | Select only if 12 V regulation and higher surge capability are required |
Compared with BZX55C13 and 1N4742A, ZMM5243B-7 delivers optimal trade-off of 13 V accuracy, MiniMELF footprint, and 300 °C/W thermal resistance - critical for compact, high-reliability industrial and automotive voltage references.
Availability
ZMM5243B-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, LED driver protection circuits, and programmable threshold detectors requiring stable component supply and tight voltage tolerance.
Supply support for ZMM5243B-7 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 and manufacturing operations across Asia and the Americas.
ZMM52xxB is part of Diodes' standard Zener diode product line targeting precision voltage regulation and protection in cost-sensitive, high-volume applications across industrial, computing, and automotive markets.
FAQ
What is the maximum steady-state power dissipation for ZMM5243B-7?
ZMM5243B-7 has a rated power dissipation of 500 mW at 25°C ambient, derating linearly above 25°C at 1.67 mW/°C (based on RJA = 300 °C/W). Full 500 mW operation requires heatsinking or board-level thermal management if ambient exceeds 25°C.
Does ZMM5243B-7 have a specified junction capacitance?
No junction capacitance value is specified for ZMM5243B-7 in the official datasheet. Figure 2 shows typical CJ vs VZ curves for the ZMM52xxB family, estimating ~5 pF at 13 V, but this is not a guaranteed parameter and must be verified experimentally for high-frequency applications.
Can ZMM5243B-7 replace ZMM5242B in a 12 V reference design?
No - ZMM5242B is rated for 12 V (11.4–12.6 V), while ZMM5243B-7 is 13 V (12.35–13.65 V). Substituting introduces a 1 V higher regulation point, potentially causing overvoltage in circuits designed for 12 V tolerance margins or feedback loop instability.
Is the cathode band on ZMM5243B-7 electrically connected to the case?
No - the MiniMELF glass package has no metallic case; the cathode band is a non-conductive ink mark applied to the glass envelope. Both anode and cathode are isolated metal leads sealed into the glass ends, with no electrical connection between band and terminals.
ZMM5243B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AC, MINI-MELF, SOD-80
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 9.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
ZMM5243B-7 FAQ
1.How can I place an order for ZMM5243B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5243B-7 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 ZMM5243B-7 reliable?
The price and inventory of ZMM5243B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5243B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5243B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5243B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5243B-7?
ZMM5243B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5243B-7 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 ZMM5243B-7?
For technical support, including ZMM5243B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5243B-7 requirements.
6.How does Aetrix verify that ZMM5243B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5243B-7 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 ZMM5243B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5243B-7?
All ZMM5243B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5243B-7, 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 ZMM5243B-7 part is unused and in its original packaging.
Return procedure for ZMM5243B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5243B-7 Tags
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