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Diodes Incorporated ZXTD4591AM832TA
- Part No.:
- ZXTD4591AM832TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
ZXTD4591AM832TA.pdf
- Description:
- TRANS NPN/PNP 40V 2A/1.5A 8-MLP
- Quantity:
- Payment:
- Shipping:
Inventory:8,856
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Product details
Overview
ZXTD4591AM832TA from Zetex Semiconductors is a complementary dual bipolar transistor in a single 3mm × 2mm MLP832 package, integrating one NPN (VCEO = 40 V, IC = 2.5 A, VCE(sat) = 300 mV @ 0.5 A) and one PNP (VCEO = −40 V, IC = −2.0 A, VCE(sat) = −350 mV @ 0.5 A) device. It delivers low on-state loss for synchronous switching in DC-DC converters and high-efficiency power management circuits.
For engineers reviewing the ZXTD4591AM832TA datasheet, ZXTD4591AM832TA pinout, ZXTD4591AM832TA application, or ZXTD4591AM832TA equivalent, key selection criteria include complementary saturation voltage matching, thermal resistance under dual-die operation (RθJA = 51 °C/W with full pad copper), and validated hFE stability up to 2 A for both polarities.
Technical Context
This dual transistor supports complementary switching topologies where matched VCE(sat) and symmetrical breakdown ratings (±40 V) enable balanced conduction in half-bridge or H-bridge configurations. Its hFE is specified across 1 mA–2 A for NPN and 1 mA–2 A for PNP, supporting wide-current linear and saturated operation.
The MLP832 package integrates exposed thermal pads for each die, enabling independent thermal path optimization. RθJA varies from 41.7 °C/W (85 cm² copper) to 125 °C/W (minimal copper), confirming design dependency on PCB layout-especially critical when both transistors operate simultaneously at rated current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO (NPN / PNP) | 40 V / −40 V - Enables use in ±36 V rail systems with 10% margin against transients. |
| IC (continuous) | 2.5 A / −2.0 A - Supports ≥2 A load current per channel without forced cooling in compact DC-DC stages. |
| VCE(sat) @ IC = 0.5 A | 300 mV / −350 mV - Limits conduction loss to <175 mW per transistor at mid-load, improving efficiency. |
| hFE @ IC = 1 A | 300 (NPN), 250 (PNP) - Ensures stable base drive requirements and predictable gain in current-sense feedback loops. |
| fT | 150 MHz - Sufficient for PWM frequencies up to 2 MHz with adequate phase margin in gate driver applications. |
| RθJA (dual-active) | 73.5 °C/W - Requires ≥10 cm² of 2 oz copper split across two thermal pads to sustain 1.7 W total dissipation. |
Pinout & Package
Package: MLP832 (3 mm × 2 mm × 0.9 mm nominal height), thermally enhanced micro leaded package with two isolated exposed pads (one per die).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1) | NPN Collector | Primary high-side current path; connects to input rail in buck or half-bridge switch node. |
| 2 (E1) | NPN Emitter | Reference node for NPN biasing; tied to common emitter point or current-sense resistor. |
| 3 (B1) | NPN Base | Low-impedance control input; requires ~100 mA drive for full saturation at 1 A collector current. |
| 4 (C2) | PNP Collector | Primary low-side current path; connects to output/load in synchronous rectifier or emitter-follower stage. |
| 5 (E2) | PNP Emitter | High-side supply reference; ties to VCC or bootstrap capacitor in high-side driver circuits. |
| 6 (B2) | PNP Base | Inverted control input; driven low to turn on PNP; compatible with standard logic-level gate drivers. |
| 7, 8 (Exposed Pads) | Thermal Ground (NPN & PNP) | Electrically isolated thermal vias required; each pad must connect to dedicated copper pour for optimal RθJA. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary VCE(sat) matching | 300 mV (NPN) / −350 mV (PNP) at 0.5 A enables balanced conduction loss in push-pull topologies. |
| hFE guaranteed to 2 A | Min. hFE = 35 (NPN) and 30 (PNP) at IC = 2 A ensures reliable saturation under full load. |
| MLP832 footprint | 3 mm × 2 mm area saves >60% board space vs. SO-8 dual transistors while maintaining thermal performance. |
| Low profile (0.9 mm) | Enables ultra-thin power modules and stacked PCB designs where Z-height is constrained to ≤1.0 mm. |
| RoHS-compliant & green | Meets EU RoHS Directive 2011/65/EU; supports customer compliance with WEEE and ELV directives. |
Applications
| DC–DC Converters | Power Switches |
|---|---|
|
Use Scenario: Synchronous buck converter operating at 500 kHz–2 MHz with 12 V input and 3.3 V/3 A output. IC Role / Device Role / Timing Role: NPN acts as high-side switch; PNP serves as synchronous rectifier, replacing Schottky diode to reduce conduction loss. Use Value: Achieves >92% efficiency at full load by cutting VF-based losses; eliminates reverse recovery issues inherent in diodes. |
Use Scenario: Dual-rail power sequencer controlling 5 V and 3.3 V supplies with controlled ramp-up timing. IC Role / Device Role / Timing Role: NPN and PNP jointly implement active pull-up/pull-down for rail-enable signals with fast edge control. Use Value: Enables sub-10 µs transition times and precise sequencing windows without external RC networks. |
| Motor Control | LED Backlighting Circuits |
|
Use Scenario: 24 V brushed DC motor driver with bidirectional PWM control and current limiting. IC Role / Device Role / Timing Role: NPN drives motor high-side; PNP sinks current during freewheeling, forming an H-bridge half-leg. Use Value: Delivers 2 A continuous stall current with <150 mW per transistor loss, reducing heatsink requirements. |
Use Scenario: White LED string driver (12 V input, 3× LEDs in series) with analog dimming and overcurrent protection. IC Role / Device Role / Timing Role: PNP regulates LED current via emitter-follower configuration; NPN controls enable/disable and fault signaling. Use Value: Maintains constant current accuracy within ±3% across temperature using hFE-stable bias network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar complementary dual transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTC4591AMC | Same electrical specs but updated MLP832 package with improved wirebond reliability; obsolete marking replaced by "MC" suffix. | Identical pinout and thermal behavior; qualified for new designs per Zetex Product Status Key (Active vs Obsolete). | Select ZXTC4591AMC for new designs-ZXTD4591AM832TA is marked Obsolete in official documentation. |
| DMC3028LSD | Complementary MOSFET pair (30 V, 6.5 A/5.5 A); lower RDS(on) but higher gate charge and no hFE linearity. | Better for high-frequency (>1 MHz) switching; unsuitable for linear-mode current regulation or analog biasing. | Choose DMC3028LSD only if gate drive capability and zero gate current are prioritized over analog gain stability. |
Compared with ZXTD4591AM832TA, ZXTC4591AMC offers identical performance with enhanced manufacturing consistency, while DMC3028LSD trades bipolar linearity for MOSFET efficiency-making the former ideal for legacy-compatible upgrades and the latter for high-speed digital switching.
Availability
ZXTD4591AM832TA is available at Aetrix Electronics and suitable for DC-DC converters, motor control modules, and LED backlighting circuits requiring stable component supply and known thermal derating behavior.
Supply support for ZXTD4591AM832TA 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
Zetex Semiconductors plc (now part of Diodes Incorporated) was a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified.
ZXTD4591AM832TA belongs to the MPPS™ Miniature Package Power Solutions family, engineered for space-constrained power conversion and driving functions where thermal density and PCB area are critical constraints.
FAQ
Is ZXTD4591AM832TA still recommended for new designs?
No. The official datasheet states "OBSOLETE - PLEASE USE ZXTC4591AMC". ZXTD4591AM832TA remains available for legacy production support, but ZXTC4591AMC is the designated replacement with identical electrical specifications and enhanced process reliability.
What is the maximum safe operating current for simultaneous NPN and PNP conduction?
At TA = 25°C with full thermal pad copper (8 cm² per die), the dual-active power dissipation limit is 1.7 W (RθJA = 73.5 °C/W). This supports ≤1.5 A NPN + ≤1.2 A PNP concurrently before junction temperature exceeds 150°C.
Can ZXTD4591AM832TA be used in linear amplifier configurations?
Yes-hFE is specified from 1 mA to 2 A for both transistors, and VCE(sat) remains stable across current range. However, fT = 150 MHz limits usable bandwidth to ≤10 MHz for small-signal amplification with acceptable gain flatness.
How should the exposed thermal pads be connected on the PCB?
Each exposed pad (pins 7 and 8) must connect to separate, isolated copper pours sized ≥2 mm², with ≥4 thermal vias (0.3 mm diameter) per pad to internal ground or thermal planes. Mixing pads electrically defeats thermal isolation and risks cross-die thermal coupling.
ZXTD4591AM832TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- 1 NPN, 1 PNP
- Current - Collector (Ic) (Max):
- 2A, 1.5A
- Voltage - Collector Emitter Breakdown (Max):
- 40V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 500mA, 5V / 300 @ 100mA, 5V
- Power - Max:
- 1W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLP (3x2)
ZXTD4591AM832TA FAQ
1.How can I place an order for ZXTD4591AM832TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTD4591AM832TA 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 ZXTD4591AM832TA reliable?
The price and inventory of ZXTD4591AM832TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTD4591AM832TA is usually 5 days.
3.What payment methods are accepted for ZXTD4591AM832TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTD4591AM832TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTD4591AM832TA?
ZXTD4591AM832TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTD4591AM832TA 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 ZXTD4591AM832TA?
For technical support, including ZXTD4591AM832TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTD4591AM832TA requirements.
6.How does Aetrix verify that ZXTD4591AM832TA is sourced from the original manufacturer or authorized distributors?
All ZXTD4591AM832TA 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 ZXTD4591AM832TA meets industry standards.
7.What is the process for return or replacement of ZXTD4591AM832TA?
All ZXTD4591AM832TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXTD4591AM832TA, 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 ZXTD4591AM832TA part is unused and in its original packaging.
Return procedure for ZXTD4591AM832TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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